Code formating

event-sourcing/etc/event-sourcing.urm.puml

@@ -0,0 +1,184 @@
+@startuml
+package com.iluwatar.event.sourcing.journal {
+  class JsonFileJournal {
+    - aFile : File
+    - events : List<String>
+    - index : int
+    + JsonFileJournal()
+    + readNext() : DomainEvent
+    + reset()
+    + write(domainEvent : DomainEvent)
+  }
+}
+package com.iluwatar.event.sourcing.processor {
+  class DomainEventProcessor {
+    - precessorJournal : ProcessorJournal
+    + DomainEventProcessor()
+    + process(domainEvent : DomainEvent)
+    + recover()
+    + setPrecessorJournal(precessorJournal : ProcessorJournal)
+  }
+}
+package com.iluwatar.event.sourcing.service {
+  class AccountService {
+    - eventProcessor : EventProcessor
+    + AccountService(eventProcessor : EventProcessor)
+    + createAccount(accountNo : int, owner : String)
+  }
+  class MoneyTransactionService {
+    - eventProcessor : EventProcessor
+    + MoneyTransactionService(eventProcessor : EventProcessor)
+    + depositMoney(accountNo : int, money : BigDecimal)
+    + transferMoney(accountNoFrom : int, accountNoTo : int, money : BigDecimal)
+    + withdrawalMoney(accountNo : int, money : BigDecimal)
+  }
+  class SequenceIdGenerator {
+    - sequenceId : long {static}
+    + SequenceIdGenerator()
+    + nextSequenceId() : long {static}
+  }
+}
+package com.iluwatar.event.sourcing.event {
+  class AccountCreateEvent {
+    - accountNo : int
+    - owner : String
+    + AccountCreateEvent(sequenceId : long, createdTime : long, accountNo : int, owner : String)
+    + getAccountNo() : int
+    + getOwner() : String
+    + process()
+  }
+  class MoneyDepositEvent {
+    - accountNo : int
+    - money : BigDecimal
+    + MoneyDepositEvent(sequenceId : long, createdTime : long, accountNo : int, money : BigDecimal)
+    + getAccountNo() : int
+    + getMoney() : BigDecimal
+    + process()
+  }
+  class MoneyTransferEvent {
+    - accountNoFrom : int
+    - accountNoTo : int
+    - money : BigDecimal
+    + MoneyTransferEvent(sequenceId : long, createdTime : long, money : BigDecimal, accountNoFrom : int, accountNoTo : int)
+    + getAccountNoFrom() : int
+    + getAccountNoTo() : int
+    + getMoney() : BigDecimal
+    + process()
+  }
+  class MoneyWithdrawalEvent {
+    - accountNo : int
+    - money : BigDecimal
+    + MoneyWithdrawalEvent(sequenceId : long, createdTime : long, accountNo : int, money : BigDecimal)
+    + getAccountNo() : int
+    + getMoney() : BigDecimal
+    + process()
+  }
+}
+package com.iluwatar.event.sourcing.gateway {
+  class AccountCreateContractSender {
+    + AccountCreateContractSender()
+    + sendContractInfo(account : Account)
+  }
+  class Gateways {
+    - accountCreateContractSender : AccountCreateContractSender {static}
+    - transactionLogger : TransactionLogger {static}
+    + Gateways()
+    + getAccountCreateContractSender() : AccountCreateContractSender {static}
+    + getTransactionLogger() : TransactionLogger {static}
+  }
+  class TransactionLogger {
+    + TransactionLogger()
+    + log(transaction : Transaction)
+  }
+}
+package com.iluwatar.event.sourcing.app {
+  class App {
+    + App()
+    + main(args : String[]) {static}
+  }
+}
+package com.iluwatar.event.sourcing.state {
+  class AccountAggregate {
+    - accounts : Map<Integer, Account> {static}
+    + AccountAggregate()
+    + getAccount(accountNo : int) : Account {static}
+    + putAccount(account : Account) {static}
+    + resetState() {static}
+  }
+}
+package com.iluwatar.event.sourcing.domain {
+  class Account {
+    - accountNo : int
+    - money : BigDecimal
+    - owner : String
+    - transactions : List<Transaction>
+    + Account(accountNo : int, owner : String)
+    + copy() : Account
+    - depositMoney(money : BigDecimal) : Transaction
+    + getAccountNo() : int
+    + getMoney() : BigDecimal
+    + getOwner() : String
+    + getTransactions() : List<Transaction>
+    - handleDeposit(money : BigDecimal, realTime : boolean)
+    + handleEvent(accountCreateEvent : AccountCreateEvent)
+    + handleEvent(moneyDepositEvent : MoneyDepositEvent)
+    + handleEvent(moneyWithdrawalEvent : MoneyWithdrawalEvent)
+    + handleTransferFromEvent(moneyTransferEvent : MoneyTransferEvent)
+    + handleTransferToEvent(moneyTransferEvent : MoneyTransferEvent)
+    - handleWithdrawal(money : BigDecimal, realTime : boolean)
+    + setMoney(money : BigDecimal)
+    + setTransactions(transactions : List<Transaction>)
+    + toString() : String
+    - withdrawMoney(money : BigDecimal) : Transaction
+  }
+  class Transaction {
+    - accountNo : int
+    - lastBalance : BigDecimal
+    - moneyIn : BigDecimal
+    - moneyOut : BigDecimal
+    + Transaction(accountNo : int, moneyIn : BigDecimal, moneyOut : BigDecimal, lastBalance : BigDecimal)
+    + getAccountNo() : int
+    + getLastBalance() : BigDecimal
+    + getMoneyIn() : BigDecimal
+    + getMoneyOut() : BigDecimal
+    + toString() : String
+  }
+}
+package com.iluwatar.event.sourcing.api {
+  abstract class DomainEvent {
+    - createdTime : long
+    - eventClassName : String
+    - realTime : boolean
+    - sequenceId : long
+    + DomainEvent(sequenceId : long, createdTime : long, eventClassName : String)
+    + getCreatedTime() : long
+    + getEventClassName() : String
+    + getSequenceId() : long
+    + isRealTime() : boolean
+    + process() {abstract}
+    + setRealTime(realTime : boolean)
+  }
+  interface EventProcessor {
+    + process(DomainEvent) {abstract}
+    + recover() {abstract}
+    + setPrecessorJournal(ProcessorJournal) {abstract}
+  }
+  interface ProcessorJournal {
+    + readNext() : DomainEvent {abstract}
+    + reset() {abstract}
+    + write(DomainEvent) {abstract}
+  }
+}
+Gateways -->  "-accountCreateContractSender" AccountCreateContractSender
+DomainEventProcessor -->  "-precessorJournal" ProcessorJournal
+Account -->  "-transactions" Transaction
+Gateways -->  "-transactionLogger" TransactionLogger
+AccountService -->  "-eventProcessor" EventProcessor
+MoneyTransactionService -->  "-eventProcessor" EventProcessor
+AccountCreateEvent --|> DomainEvent 
+MoneyDepositEvent --|> DomainEvent 
+MoneyTransferEvent --|> DomainEvent 
+MoneyWithdrawalEvent --|> DomainEvent 
+JsonFileJournal ..|> ProcessorJournal 
+DomainEventProcessor ..|> EventProcessor 
+@enduml

event-sourcing/src/main/java/com/iluwatar/event/sourcing/api/DomainEvent.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.api;
 
 import java.io.Serializable;
@@ -6,36 +28,72 @@ import java.io.Serializable;
  * Created by serdarh on 06.08.2017.
  */
 public abstract class DomainEvent implements Serializable {
-    private final long sequenceId;
-    private final long createdTime;
-    private boolean realTime = true;
-    private final String eventClassName;
 
-    public DomainEvent(long sequenceId, long createdTime, String eventClassName) {
-        this.sequenceId = sequenceId;
-        this.createdTime = createdTime;
-        this.eventClassName = eventClassName;
-    }
+  private final long sequenceId;
+  private final long createdTime;
+  private final String eventClassName;
+  private boolean realTime = true;
 
-    public long getSequenceId() {
-        return sequenceId;
-    }
+  /**
+   * Instantiates a new Domain event.
+   *
+   * @param sequenceId the sequence id
+   * @param createdTime the created time
+   * @param eventClassName the event class name
+   */
+  public DomainEvent(long sequenceId, long createdTime, String eventClassName) {
+    this.sequenceId = sequenceId;
+    this.createdTime = createdTime;
+    this.eventClassName = eventClassName;
+  }
 
-    public long getCreatedTime() {
-        return createdTime;
-    }
+  /**
+   * Gets sequence id.
+   *
+   * @return the sequence id
+   */
+  public long getSequenceId() {
+    return sequenceId;
+  }
 
-    public boolean isRealTime() {
-        return realTime;
-    }
+  /**
+   * Gets created time.
+   *
+   * @return the created time
+   */
+  public long getCreatedTime() {
+    return createdTime;
+  }
 
-    public void setRealTime(boolean realTime) {
-        this.realTime = realTime;
-    }
+  /**
+   * Is real time boolean.
+   *
+   * @return the boolean
+   */
+  public boolean isRealTime() {
+    return realTime;
+  }
 
-    public abstract void process();
+  /**
+   * Sets real time.
+   *
+   * @param realTime the real time
+   */
+  public void setRealTime(boolean realTime) {
+    this.realTime = realTime;
+  }
 
-    public String getEventClassName() {
-        return eventClassName;
-    }
+  /**
+   * Process.
+   */
+  public abstract void process();
+
+  /**
+   * Gets event class name.
+   *
+   * @return the event class name
+   */
+  public String getEventClassName() {
+    return eventClassName;
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/api/EventProcessor.java

@@ -1,10 +1,48 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.api;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public interface EventProcessor {
-    void process(DomainEvent domainEvent);
-    void setPrecessorJournal(ProcessorJournal precessorJournal);
-    void recover();
+
+  /**
+   * Process.
+   *
+   * @param domainEvent the domain event
+   */
+  void process(DomainEvent domainEvent);
+
+  /**
+   * Sets precessor journal.
+   *
+   * @param precessorJournal the precessor journal
+   */
+  void setPrecessorJournal(ProcessorJournal precessorJournal);
+
+  /**
+   * Recover.
+   */
+  void recover();
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/api/ProcessorJournal.java

@@ -1,10 +1,48 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.api;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public interface ProcessorJournal {
-    void write(DomainEvent domainEvent);
-    void reset();
-    DomainEvent readNext();
+
+  /**
+   * Write.
+   *
+   * @param domainEvent the domain event
+   */
+  void write(DomainEvent domainEvent);
+
+  /**
+   * Reset.
+   */
+  void reset();
+
+  /**
+   * Read next domain event.
+   *
+   * @return the domain event
+   */
+  DomainEvent readNext();
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/app/App.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.app;
 
 import com.iluwatar.event.sourcing.journal.JsonFileJournal;
@@ -5,7 +27,6 @@ import com.iluwatar.event.sourcing.processor.DomainEventProcessor;
 import com.iluwatar.event.sourcing.service.AccountService;
 import com.iluwatar.event.sourcing.service.MoneyTransactionService;
 import com.iluwatar.event.sourcing.state.AccountAggregate;
-
 import java.math.BigDecimal;
 
 /**
@@ -13,46 +34,52 @@ import java.math.BigDecimal;
  */
 public class App {
 
-    public static void main(String[] args) {
-        System.out.println("Running the system first time............");
+  /**
+   * The entry point of application.
+   *
+   * @param args the input arguments
+   */
+  public static void main(String[] args) {
+    System.out.println("Running the system first time............");
 
-        DomainEventProcessor domainEventProcessor = new DomainEventProcessor();
-        JsonFileJournal jsonFileJournal = new JsonFileJournal();
-        jsonFileJournal.reset();
-        domainEventProcessor.setPrecessorJournal(jsonFileJournal);
+    DomainEventProcessor domainEventProcessor = new DomainEventProcessor();
+    JsonFileJournal jsonFileJournal = new JsonFileJournal();
+    jsonFileJournal.reset();
+    domainEventProcessor.setPrecessorJournal(jsonFileJournal);
 
-        System.out.println("Creating th accounts............");
+    System.out.println("Creating th accounts............");
 
-        AccountService accountService = new AccountService(domainEventProcessor);
-        MoneyTransactionService moneyTransactionService = new MoneyTransactionService(domainEventProcessor);
-        accountService.createAccount(1,"Daenerys Targaryen");
-        accountService.createAccount(2,"Jon Snow");
+    AccountService accountService = new AccountService(domainEventProcessor);
+    MoneyTransactionService moneyTransactionService = new MoneyTransactionService(
+        domainEventProcessor);
+    accountService.createAccount(1, "Daenerys Targaryen");
+    accountService.createAccount(2, "Jon Snow");
 
-        System.out.println("Do some money operations............");
+    System.out.println("Do some money operations............");
 
-        moneyTransactionService.depositMoney(1,new BigDecimal("100000"));
-        moneyTransactionService.depositMoney(2,new BigDecimal("10"));
+    moneyTransactionService.depositMoney(1, new BigDecimal("100000"));
+    moneyTransactionService.depositMoney(2, new BigDecimal("100"));
 
-        moneyTransactionService.transferMoney(1,2,new BigDecimal("10000"));
-        moneyTransactionService.withdrawalMoney(2, new BigDecimal("1000"));
+    moneyTransactionService.transferMoney(1, 2, new BigDecimal("10000"));
+    moneyTransactionService.withdrawalMoney(2, new BigDecimal("1000"));
 
-        System.out.println("...............State:............");
-        System.out.println(AccountAggregate.getAccount(1));
-        System.out.println(AccountAggregate.getAccount(2));
+    System.out.println("...............State:............");
+    System.out.println(AccountAggregate.getAccount(1));
+    System.out.println(AccountAggregate.getAccount(2));
 
-        System.out.println("At that point system goes down state in memory cleared............");
+    System.out.println("At that point system goes down state in memory cleared............");
 
-        AccountAggregate.resetState();
+    AccountAggregate.resetState();
 
-        System.out.println("Recover the syste by the events in journal file............");
+    System.out.println("Recover the syste by the events in journal file............");
 
-        domainEventProcessor = new DomainEventProcessor();
-        jsonFileJournal = new JsonFileJournal();
-        domainEventProcessor.setPrecessorJournal(jsonFileJournal);
-        domainEventProcessor.recover();
+    domainEventProcessor = new DomainEventProcessor();
+    jsonFileJournal = new JsonFileJournal();
+    domainEventProcessor.setPrecessorJournal(jsonFileJournal);
+    domainEventProcessor.recover();
 
-        System.out.println("...............State Recovered:............");
-        System.out.println(AccountAggregate.getAccount(1));
-        System.out.println(AccountAggregate.getAccount(2));
-    }
+    System.out.println("...............State Recovered:............");
+    System.out.println(AccountAggregate.getAccount(1));
+    System.out.println(AccountAggregate.getAccount(2));
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/domain/Account.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.domain;
 
 import com.iluwatar.event.sourcing.event.AccountCreateEvent;
@@ -6,7 +28,6 @@ import com.iluwatar.event.sourcing.event.MoneyTransferEvent;
 import com.iluwatar.event.sourcing.event.MoneyWithdrawalEvent;
 import com.iluwatar.event.sourcing.gateway.Gateways;
 import com.iluwatar.event.sourcing.state.AccountAggregate;
-
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
@@ -15,116 +36,184 @@ import java.util.List;
  * Created by serdarh on 06.08.2017.
  */
 public class Account {
-    private final int accountNo;
-    private final String owner;
-    private BigDecimal money;
-    private List<Transaction> transactions;
 
-    public Account(int accountNo, String owner) {
-        this.accountNo = accountNo;
-        this.owner = owner;
-        money = BigDecimal.ZERO;
-        transactions = new ArrayList<>();
+  private final int accountNo;
+  private final String owner;
+  private BigDecimal money;
+  private List<Transaction> transactions;
+
+  /**
+   * Instantiates a new Account.
+   *
+   * @param accountNo the account no
+   * @param owner the owner
+   */
+  public Account(int accountNo, String owner) {
+    this.accountNo = accountNo;
+    this.owner = owner;
+    money = BigDecimal.ZERO;
+    transactions = new ArrayList<>();
+  }
+
+  /**
+   * Gets account no.
+   *
+   * @return the account no
+   */
+  public int getAccountNo() {
+    return accountNo;
+  }
+
+  /**
+   * Gets owner.
+   *
+   * @return the owner
+   */
+  public String getOwner() {
+    return owner;
+  }
+
+  /**
+   * Gets money.
+   *
+   * @return the money
+   */
+  public BigDecimal getMoney() {
+    return money;
+  }
+
+  /**
+   * Sets money.
+   *
+   * @param money the money
+   */
+  public void setMoney(BigDecimal money) {
+    this.money = money;
+  }
+
+  /**
+   * Gets transactions.
+   *
+   * @return the transactions
+   */
+  public List<Transaction> getTransactions() {
+    return transactions;
+  }
+
+  /**
+   * Sets transactions.
+   *
+   * @param transactions the transactions
+   */
+  public void setTransactions(List<Transaction> transactions) {
+    this.transactions = transactions;
+  }
+
+  /**
+   * Copy account.
+   *
+   * @return the account
+   */
+  public Account copy() {
+    Account account = new Account(accountNo, owner);
+    account.setMoney(money);
+    account.setTransactions(transactions);
+    return account;
+  }
+
+  @Override
+  public String toString() {
+    return "Account{"
+        + "accountNo=" + accountNo
+        + ", owner='" + owner + '\''
+        + ", money=" + money
+        + ", transactions=" + transactions
+        + '}';
+  }
+
+  private Transaction depositMoney(BigDecimal money) {
+    this.money = this.money.add(money);
+    Transaction transaction = new Transaction(accountNo, money, BigDecimal.ZERO, this.money);
+    transactions.add(transaction);
+    return transaction;
+  }
+
+  private Transaction withdrawMoney(BigDecimal money) {
+    this.money = this.money.subtract(money);
+    Transaction transaction = new Transaction(accountNo, BigDecimal.ZERO, money, this.money);
+    transactions.add(transaction);
+    return transaction;
+  }
+
+  private void handleDeposit(BigDecimal money, boolean realTime) {
+    Transaction transaction = depositMoney(money);
+    AccountAggregate.putAccount(this);
+    if (realTime) {
+      Gateways.getTransactionLogger().log(transaction);
+    }
+  }
+
+  private void handleWithdrawal(BigDecimal money, boolean realTime) {
+    if (this.money.compareTo(money) == -1) {
+      throw new RuntimeException("Insufficient Account Balance");
     }
 
-    public int getAccountNo() {
-        return accountNo;
+    Transaction transaction = withdrawMoney(money);
+    AccountAggregate.putAccount(this);
+    if (realTime) {
+      Gateways.getTransactionLogger().log(transaction);
     }
+  }
 
-    public String getOwner() {
-        return owner;
+  /**
+   * Handle event.
+   *
+   * @param moneyDepositEvent the money deposit event
+   */
+  public void handleEvent(MoneyDepositEvent moneyDepositEvent) {
+    handleDeposit(moneyDepositEvent.getMoney(), moneyDepositEvent.isRealTime());
+  }
+
+
+  /**
+   * Handle event.
+   *
+   * @param moneyWithdrawalEvent the money withdrawal event
+   */
+  public void handleEvent(MoneyWithdrawalEvent moneyWithdrawalEvent) {
+    handleWithdrawal(moneyWithdrawalEvent.getMoney(), moneyWithdrawalEvent.isRealTime());
+  }
+
+  /**
+   * Handle event.
+   *
+   * @param accountCreateEvent the account create event
+   */
+  public void handleEvent(AccountCreateEvent accountCreateEvent) {
+    AccountAggregate.putAccount(this);
+    // check if this event is replicated from journal before calling an external gateway function
+    if (accountCreateEvent.isRealTime()) {
+      Gateways.getAccountCreateContractSender().sendContractInfo(this);
     }
+  }
 
-    public BigDecimal getMoney() {
-        return money;
-    }
+  /**
+   * Handle transfer from event.
+   *
+   * @param moneyTransferEvent the money transfer event
+   */
+  public void handleTransferFromEvent(MoneyTransferEvent moneyTransferEvent) {
+    handleWithdrawal(moneyTransferEvent.getMoney(), moneyTransferEvent.isRealTime());
+  }
 
-    public List<Transaction> getTransactions() {
-        return transactions;
-    }
-
-    public void setMoney(BigDecimal money) {
-        this.money = money;
-    }
-
-    public void setTransactions(List<Transaction> transactions) {
-        this.transactions = transactions;
-    }
-
-    public Account copy() {
-        Account account = new Account(accountNo, owner);
-        account.setMoney(money);
-        account.setTransactions(transactions);
-        return account;
-    }
-
-    @Override
-    public String toString() {
-        return "Account{" +
-                "accountNo=" + accountNo +
-                ", owner='" + owner + '\'' +
-                ", money=" + money +
-                ", transactions=" + transactions +
-                '}';
-    }
-
-    private Transaction depositMoney(BigDecimal money) {
-        this.money = this.money.add(money);
-        Transaction transaction = new Transaction(accountNo,money,BigDecimal.ZERO,this.money);
-        transactions.add(transaction);
-        return transaction;
-    }
-
-    private Transaction withdrawMoney(BigDecimal money) {
-        this.money = this.money.subtract(money);
-        Transaction transaction = new Transaction(accountNo,BigDecimal.ZERO,money,this.money);
-        transactions.add(transaction);
-        return transaction;
-    }
-
-    private void handleDeposit(BigDecimal money,boolean realTime) {
-        Transaction transaction = depositMoney(money);
-        AccountAggregate.putAccount(this);
-        if(realTime) {
-            Gateways.getTransactionLogger().log(transaction);
-        }
-    }
-
-    private void handleWithdrawal(BigDecimal money, boolean realTime) {
-        if(this.money.compareTo(money)==-1){
-            throw new RuntimeException("Insufficient Account Balance");
-        }
-
-        Transaction transaction = withdrawMoney(money);
-        AccountAggregate.putAccount(this);
-        if(realTime) {
-            Gateways.getTransactionLogger().log(transaction);
-        }
-    }
-
-    public void handleEvent(MoneyDepositEvent moneyDepositEvent) {
-        handleDeposit(moneyDepositEvent.getMoney(),moneyDepositEvent.isRealTime());
-    }
+  /**
+   * Handle transfer to event.
+   *
+   * @param moneyTransferEvent the money transfer event
+   */
+  public void handleTransferToEvent(MoneyTransferEvent moneyTransferEvent) {
+    handleDeposit(moneyTransferEvent.getMoney(), moneyTransferEvent.isRealTime());
+  }
 
 
-    public void handleEvent(MoneyWithdrawalEvent moneyWithdrawalEvent) {
-        handleWithdrawal(moneyWithdrawalEvent.getMoney(),moneyWithdrawalEvent.isRealTime());
-    }
-
-
-    public void handleTransferFromEvent(MoneyTransferEvent moneyTransferEvent) {
-        handleWithdrawal(moneyTransferEvent.getMoney(),moneyTransferEvent.isRealTime());
-    }
-
-    public void handleTransferToEvent(MoneyTransferEvent moneyTransferEvent) {
-        handleDeposit(moneyTransferEvent.getMoney(),moneyTransferEvent.isRealTime());
-    }
-
-    public void handleEvent(AccountCreateEvent accountCreateEvent) {
-        AccountAggregate.putAccount(this);
-        // check if this event is replicated from journal before calling an external gateway function
-        if(accountCreateEvent.isRealTime()) {
-            Gateways.getAccountCreateContractSender().sendContractInfo(this);
-        }
-    }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/domain/Transaction.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.domain;
 
 import java.math.BigDecimal;
@@ -6,41 +28,71 @@ import java.math.BigDecimal;
  * Created by serdarh on 06.08.2017.
  */
 public class Transaction {
-    private final int accountNo;
-    private final BigDecimal moneyIn;
-    private final BigDecimal moneyOut;
-    private final BigDecimal lastBalance;
 
-    public Transaction(int accountNo, BigDecimal moneyIn, BigDecimal moneyOut, BigDecimal lastBalance) {
-        this.accountNo = accountNo;
-        this.moneyIn = moneyIn;
-        this.moneyOut = moneyOut;
-        this.lastBalance = lastBalance;
-    }
+  private final int accountNo;
+  private final BigDecimal moneyIn;
+  private final BigDecimal moneyOut;
+  private final BigDecimal lastBalance;
 
-    public int getAccountNo() {
-        return accountNo;
-    }
+  /**
+   * Instantiates a new Transaction.
+   *
+   * @param accountNo the account no
+   * @param moneyIn the money in
+   * @param moneyOut the money out
+   * @param lastBalance the last balance
+   */
+  public Transaction(int accountNo, BigDecimal moneyIn, BigDecimal moneyOut,
+      BigDecimal lastBalance) {
+    this.accountNo = accountNo;
+    this.moneyIn = moneyIn;
+    this.moneyOut = moneyOut;
+    this.lastBalance = lastBalance;
+  }
 
-    public BigDecimal getMoneyIn() {
-        return moneyIn;
-    }
+  /**
+   * Gets account no.
+   *
+   * @return the account no
+   */
+  public int getAccountNo() {
+    return accountNo;
+  }
 
-    public BigDecimal getMoneyOut() {
-        return moneyOut;
-    }
+  /**
+   * Gets money in.
+   *
+   * @return the money in
+   */
+  public BigDecimal getMoneyIn() {
+    return moneyIn;
+  }
 
-    public BigDecimal getLastBalance() {
-        return lastBalance;
-    }
+  /**
+   * Gets money out.
+   *
+   * @return the money out
+   */
+  public BigDecimal getMoneyOut() {
+    return moneyOut;
+  }
 
-    @Override
-    public String toString() {
-        return "Transaction{" +
-                "accountNo=" + accountNo +
-                ", moneyIn=" + moneyIn +
-                ", moneyOut=" + moneyOut +
-                ", lastBalance=" + lastBalance +
-                '}';
-    }
+  /**
+   * Gets last balance.
+   *
+   * @return the last balance
+   */
+  public BigDecimal getLastBalance() {
+    return lastBalance;
+  }
+
+  @Override
+  public String toString() {
+    return "Transaction{"
+        + "accountNo=" + accountNo
+        + ", moneyIn=" + moneyIn
+        + ", moneyOut=" + moneyOut
+        + ", lastBalance=" + lastBalance
+        + '}';
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/event/AccountCreateEvent.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.event;
 
 import com.iluwatar.event.sourcing.api.DomainEvent;
@@ -8,30 +30,49 @@ import com.iluwatar.event.sourcing.state.AccountAggregate;
  * Created by serdarh on 06.08.2017.
  */
 public class AccountCreateEvent extends DomainEvent {
-    private final int accountNo;
-    private final String owner;
 
-    public AccountCreateEvent(long sequenceId, long createdTime, int accountNo, String owner) {
-        super(sequenceId, createdTime, "AccountCreateEvent");
-        this.accountNo = accountNo;
-        this.owner = owner;
-    }
+  private final int accountNo;
+  private final String owner;
 
-    public int getAccountNo() {
-        return accountNo;
-    }
+  /**
+   * Instantiates a new Account create event.
+   *
+   * @param sequenceId the sequence id
+   * @param createdTime the created time
+   * @param accountNo the account no
+   * @param owner the owner
+   */
+  public AccountCreateEvent(long sequenceId, long createdTime, int accountNo, String owner) {
+    super(sequenceId, createdTime, "AccountCreateEvent");
+    this.accountNo = accountNo;
+    this.owner = owner;
+  }
 
-    public String getOwner() {
-        return owner;
-    }
+  /**
+   * Gets account no.
+   *
+   * @return the account no
+   */
+  public int getAccountNo() {
+    return accountNo;
+  }
 
-    @Override
-    public void process() {
-        Account account = AccountAggregate.getAccount(accountNo);
-        if(account!=null){
-            throw new RuntimeException("Account already exists");
-        }
-        account = new Account(accountNo,owner);
-        account.handleEvent(this);
+  /**
+   * Gets owner.
+   *
+   * @return the owner
+   */
+  public String getOwner() {
+    return owner;
+  }
+
+  @Override
+  public void process() {
+    Account account = AccountAggregate.getAccount(accountNo);
+    if (account != null) {
+      throw new RuntimeException("Account already exists");
     }
+    account = new Account(accountNo, owner);
+    account.handleEvent(this);
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/event/MoneyDepositEvent.java

@@ -1,38 +1,78 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.event;
 
 import com.iluwatar.event.sourcing.api.DomainEvent;
 import com.iluwatar.event.sourcing.domain.Account;
 import com.iluwatar.event.sourcing.state.AccountAggregate;
-
 import java.math.BigDecimal;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public class MoneyDepositEvent extends DomainEvent {
-    private BigDecimal money;
-    private int accountNo;
 
-    public MoneyDepositEvent(long sequenceId, long createdTime, int accountNo,BigDecimal money) {
-        super(sequenceId, createdTime, "MoneyDepositEvent");
-        this.money = money;
-        this.accountNo = accountNo;
-    }
+  private BigDecimal money;
+  private int accountNo;
 
-    public BigDecimal getMoney() {
-        return money;
-    }
+  /**
+   * Instantiates a new Money deposit event.
+   *
+   * @param sequenceId the sequence id
+   * @param createdTime the created time
+   * @param accountNo the account no
+   * @param money the money
+   */
+  public MoneyDepositEvent(long sequenceId, long createdTime, int accountNo, BigDecimal money) {
+    super(sequenceId, createdTime, "MoneyDepositEvent");
+    this.money = money;
+    this.accountNo = accountNo;
+  }
 
-    public int getAccountNo() {
-        return accountNo;
-    }
+  /**
+   * Gets money.
+   *
+   * @return the money
+   */
+  public BigDecimal getMoney() {
+    return money;
+  }
 
-    @Override
-    public void process() {
-        Account account = AccountAggregate.getAccount(accountNo);
-        if(account==null){
-            throw new RuntimeException("Account not found");
-        }
-        account.handleEvent(this);
+  /**
+   * Gets account no.
+   *
+   * @return the account no
+   */
+  public int getAccountNo() {
+    return accountNo;
+  }
+
+  @Override
+  public void process() {
+    Account account = AccountAggregate.getAccount(accountNo);
+    if (account == null) {
+      throw new RuntimeException("Account not found");
     }
+    account.handleEvent(this);
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/event/MoneyTransferEvent.java

@@ -1,50 +1,97 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.event;
 
 import com.iluwatar.event.sourcing.api.DomainEvent;
 import com.iluwatar.event.sourcing.domain.Account;
 import com.iluwatar.event.sourcing.state.AccountAggregate;
-
 import java.math.BigDecimal;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public class MoneyTransferEvent extends DomainEvent {
-    private BigDecimal money;
-    private int accountNoFrom;
-    private int accountNoTo;
 
-    public MoneyTransferEvent(long sequenceId, long createdTime, BigDecimal money, int accountNoFrom, int accountNoTo) {
-        super(sequenceId, createdTime, "MoneyTransferEvent");
-        this.money = money;
-        this.accountNoFrom = accountNoFrom;
-        this.accountNoTo = accountNoTo;
+  private BigDecimal money;
+  private int accountNoFrom;
+  private int accountNoTo;
+
+  /**
+   * Instantiates a new Money transfer event.
+   *
+   * @param sequenceId the sequence id
+   * @param createdTime the created time
+   * @param money the money
+   * @param accountNoFrom the account no from
+   * @param accountNoTo the account no to
+   */
+  public MoneyTransferEvent(long sequenceId, long createdTime, BigDecimal money, int accountNoFrom,
+      int accountNoTo) {
+    super(sequenceId, createdTime, "MoneyTransferEvent");
+    this.money = money;
+    this.accountNoFrom = accountNoFrom;
+    this.accountNoTo = accountNoTo;
+  }
+
+  /**
+   * Gets money.
+   *
+   * @return the money
+   */
+  public BigDecimal getMoney() {
+    return money;
+  }
+
+  /**
+   * Gets account no from.
+   *
+   * @return the account no from
+   */
+  public int getAccountNoFrom() {
+    return accountNoFrom;
+  }
+
+  /**
+   * Gets account no to.
+   *
+   * @return the account no to
+   */
+  public int getAccountNoTo() {
+    return accountNoTo;
+  }
+
+  @Override
+  public void process() {
+    Account accountFrom = AccountAggregate.getAccount(accountNoFrom);
+    if (accountFrom == null) {
+      throw new RuntimeException("Account not found " + accountNoFrom);
+    }
+    Account accountTo = AccountAggregate.getAccount(accountNoTo);
+    if (accountTo == null) {
+      throw new RuntimeException("Account not found" + accountTo);
     }
 
-    public BigDecimal getMoney() {
-        return money;
-    }
-
-    public int getAccountNoFrom() {
-        return accountNoFrom;
-    }
-
-    public int getAccountNoTo() {
-        return accountNoTo;
-    }
-
-    @Override
-    public void process() {
-        Account accountFrom = AccountAggregate.getAccount(accountNoFrom);
-        if(accountFrom==null){
-            throw new RuntimeException("Account not found "+accountNoFrom);
-        }
-        Account accountTo = AccountAggregate.getAccount(accountNoTo);
-        if(accountTo==null){
-            throw new RuntimeException("Account not found"+ accountTo);
-        }
-
-        accountFrom.handleTransferFromEvent(this);
-        accountTo.handleTransferToEvent(this);
-    }
+    accountFrom.handleTransferFromEvent(this);
+    accountTo.handleTransferToEvent(this);
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/event/MoneyWithdrawalEvent.java

@@ -1,38 +1,78 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.event;
 
 import com.iluwatar.event.sourcing.api.DomainEvent;
 import com.iluwatar.event.sourcing.domain.Account;
 import com.iluwatar.event.sourcing.state.AccountAggregate;
-
 import java.math.BigDecimal;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public class MoneyWithdrawalEvent extends DomainEvent {
-    private BigDecimal money;
-    private int accountNo;
 
-    public MoneyWithdrawalEvent(long sequenceId, long createdTime, int accountNo,BigDecimal money) {
-        super(sequenceId, createdTime, "MoneyWithdrawalEvent");
-        this.money = money;
-        this.accountNo = accountNo;
-    }
+  private BigDecimal money;
+  private int accountNo;
 
-    public BigDecimal getMoney() {
-        return money;
-    }
+  /**
+   * Instantiates a new Money withdrawal event.
+   *
+   * @param sequenceId the sequence id
+   * @param createdTime the created time
+   * @param accountNo the account no
+   * @param money the money
+   */
+  public MoneyWithdrawalEvent(long sequenceId, long createdTime, int accountNo, BigDecimal money) {
+    super(sequenceId, createdTime, "MoneyWithdrawalEvent");
+    this.money = money;
+    this.accountNo = accountNo;
+  }
 
-    public int getAccountNo() {
-        return accountNo;
-    }
+  /**
+   * Gets money.
+   *
+   * @return the money
+   */
+  public BigDecimal getMoney() {
+    return money;
+  }
 
-    @Override
-    public void process() {
-        Account account = AccountAggregate.getAccount(accountNo);
-        if(account==null){
-            throw new RuntimeException("Account not found");
-        }
-        account.handleEvent(this);
+  /**
+   * Gets account no.
+   *
+   * @return the account no
+   */
+  public int getAccountNo() {
+    return accountNo;
+  }
+
+  @Override
+  public void process() {
+    Account account = AccountAggregate.getAccount(accountNo);
+    if (account == null) {
+      throw new RuntimeException("Account not found");
     }
+    account.handleEvent(this);
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/gateway/AccountCreateContractSender.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.gateway;
 
 import com.iluwatar.event.sourcing.domain.Account;
@@ -6,7 +28,13 @@ import com.iluwatar.event.sourcing.domain.Account;
  * Created by serdarh on 06.08.2017.
  */
 public class AccountCreateContractSender {
-    public void sendContractInfo(Account account){
-        // an example imaginary funciton which sends account info to some external end point
-    }
+
+  /**
+   * Send contract info.
+   *
+   * @param account the account
+   */
+  public void sendContractInfo(Account account) {
+    // an example imaginary funciton which sends account info to some external end point
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/gateway/Gateways.java

@@ -1,17 +1,50 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.gateway;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public class Gateways {
-    private static AccountCreateContractSender accountCreateContractSender = new AccountCreateContractSender();
-    private static TransactionLogger transactionLogger = new TransactionLogger();
 
-    public static AccountCreateContractSender getAccountCreateContractSender() {
-        return accountCreateContractSender;
-    }
+  private static AccountCreateContractSender accountCreateContractSender = new AccountCreateContractSender();
+  private static TransactionLogger transactionLogger = new TransactionLogger();
 
-    public static TransactionLogger getTransactionLogger() {
-        return transactionLogger;
-    }
+  /**
+   * Gets account create contract sender.
+   *
+   * @return the account create contract sender
+   */
+  public static AccountCreateContractSender getAccountCreateContractSender() {
+    return accountCreateContractSender;
+  }
+
+  /**
+   * Gets transaction logger.
+   *
+   * @return the transaction logger
+   */
+  public static TransactionLogger getTransactionLogger() {
+    return transactionLogger;
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/gateway/TransactionLogger.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.gateway;
 
 import com.iluwatar.event.sourcing.domain.Transaction;
@@ -6,7 +28,13 @@ import com.iluwatar.event.sourcing.domain.Transaction;
  * Created by serdarh on 06.08.2017.
  */
 public class TransactionLogger {
-    public void log(Transaction transaction) {
-        // example imaginary function that logs the transaction to somewhere
-    }
+
+  /**
+   * Log.
+   *
+   * @param transaction the transaction
+   */
+  public void log(Transaction transaction) {
+    // example imaginary function that logs the transaction to somewhere
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/journal/JsonFileJournal.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.journal;
 
 import com.google.gson.Gson;
@@ -9,91 +31,104 @@ import com.iluwatar.event.sourcing.event.AccountCreateEvent;
 import com.iluwatar.event.sourcing.event.MoneyDepositEvent;
 import com.iluwatar.event.sourcing.event.MoneyTransferEvent;
 import com.iluwatar.event.sourcing.event.MoneyWithdrawalEvent;
-
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.Writer;
 import java.util.ArrayList;
 import java.util.List;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
-public class JsonFileJournal implements ProcessorJournal{
+public class JsonFileJournal implements ProcessorJournal {
 
-    private File aFile;
-    private List<String> events = new ArrayList<>();
-    private int index = 0;
-    public JsonFileJournal() {
-        aFile = new File("Journal.json");
-        if(aFile.exists()) {
-            try (BufferedReader input = new BufferedReader(new InputStreamReader(new FileInputStream(aFile), "UTF-8"))) {
-                String line;
-                while ((line = input.readLine()) != null) {
-                    events.add(line);
-                }
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
-        }else{
-            reset();
+  private File aFile;
+  private List<String> events = new ArrayList<>();
+  private int index = 0;
+
+  /**
+   * Instantiates a new Json file journal.
+   */
+  public JsonFileJournal() {
+    aFile = new File("Journal.json");
+    if (aFile.exists()) {
+      try (BufferedReader input = new BufferedReader(
+          new InputStreamReader(new FileInputStream(aFile), "UTF-8"))) {
+        String line;
+        while ((line = input.readLine()) != null) {
+          events.add(line);
         }
+      } catch (IOException e) {
+        throw new RuntimeException(e);
+      }
+    } else {
+      reset();
+    }
+  }
+
+  @Override
+  public void write(DomainEvent domainEvent) {
+    Gson gson = new Gson();
+    JsonElement jsonElement;
+    if (domainEvent instanceof AccountCreateEvent) {
+      jsonElement = gson.toJsonTree(domainEvent, AccountCreateEvent.class);
+    } else if (domainEvent instanceof MoneyDepositEvent) {
+      jsonElement = gson.toJsonTree(domainEvent, MoneyDepositEvent.class);
+    } else if (domainEvent instanceof MoneyWithdrawalEvent) {
+      jsonElement = gson.toJsonTree(domainEvent, MoneyWithdrawalEvent.class);
+    } else if (domainEvent instanceof MoneyTransferEvent) {
+      jsonElement = gson.toJsonTree(domainEvent, MoneyTransferEvent.class);
+    } else {
+      throw new RuntimeException("Journal Event not recegnized");
     }
 
-    @Override
-    public void write(DomainEvent domainEvent) {
-        Gson gson = new Gson();
-        JsonElement jsonElement;
-        if(domainEvent instanceof AccountCreateEvent) {
-            jsonElement = gson.toJsonTree(domainEvent, AccountCreateEvent.class);
-        }else if(domainEvent instanceof MoneyDepositEvent) {
-            jsonElement = gson.toJsonTree(domainEvent, MoneyDepositEvent.class);
-        }else if(domainEvent instanceof MoneyWithdrawalEvent) {
-            jsonElement = gson.toJsonTree(domainEvent, MoneyWithdrawalEvent.class);
-        }else if(domainEvent instanceof MoneyTransferEvent) {
-            jsonElement = gson.toJsonTree(domainEvent, MoneyTransferEvent.class);
-        }else{
-            throw new RuntimeException("Journal Event not recegnized");
-        }
+    try (Writer output = new BufferedWriter(
+        new OutputStreamWriter(new FileOutputStream(aFile, true), "UTF-8"))) {
+      String eventString = jsonElement.toString();
+      output.write(eventString + "\r\n");
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
 
-        try (Writer output = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(aFile, true), "UTF-8"))) {
-            String eventString = jsonElement.toString();
-            output.write(eventString +"\r\n");
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
+  @Override
+  public void reset() {
+    aFile.delete();
+  }
+
+
+  @Override
+  public DomainEvent readNext() {
+    if (index >= events.size()) {
+      return null;
+    }
+    String event = events.get(index);
+    index++;
+
+    JsonParser parser = new JsonParser();
+    JsonElement jsonElement = parser.parse(event);
+    String eventClassName = jsonElement.getAsJsonObject().get("eventClassName").getAsString();
+    Gson gson = new Gson();
+    DomainEvent domainEvent;
+    if (eventClassName.equals("AccountCreateEvent")) {
+      domainEvent = gson.fromJson(jsonElement, AccountCreateEvent.class);
+    } else if (eventClassName.equals("MoneyDepositEvent")) {
+      domainEvent = gson.fromJson(jsonElement, MoneyDepositEvent.class);
+    } else if (eventClassName.equals("MoneyTransferEvent")) {
+      domainEvent = gson.fromJson(jsonElement, MoneyTransferEvent.class);
+    } else if (eventClassName.equals("MoneyWithdrawalEvent")) {
+      domainEvent = gson.fromJson(jsonElement, MoneyWithdrawalEvent.class);
+    } else {
+      throw new RuntimeException("Journal Event not recegnized");
     }
 
-    @Override
-    public void reset() {
-            aFile.delete();
-    }
-
-
-    @Override
-    public DomainEvent readNext() {
-        if(index>=events.size()){
-            return null;
-        }
-        String event = events.get(index);
-        index++;
-
-        JsonParser parser = new JsonParser();
-        JsonElement jsonElement = parser.parse(event);
-        String eventClassName = jsonElement.getAsJsonObject().get("eventClassName").getAsString();
-        Gson gson = new Gson();
-        DomainEvent domainEvent;
-        if(eventClassName.equals("AccountCreateEvent")) {
-            domainEvent = gson.fromJson(jsonElement, AccountCreateEvent.class);
-        }else if(eventClassName.equals("MoneyDepositEvent")) {
-            domainEvent = gson.fromJson(jsonElement, MoneyDepositEvent.class);
-        }else if(eventClassName.equals("MoneyTransferEvent")) {
-            domainEvent = gson.fromJson(jsonElement, MoneyTransferEvent.class);
-        }else if(eventClassName.equals("MoneyWithdrawalEvent")) {
-            domainEvent = gson.fromJson(jsonElement, MoneyWithdrawalEvent.class);
-        }else{
-            throw new RuntimeException("Journal Event not recegnized");
-        }
-
-        domainEvent.setRealTime(false);
-        return domainEvent;
-    }
+    domainEvent.setRealTime(false);
+    return domainEvent;
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/processor/DomainEventProcessor.java

@@ -1,3 +1,25 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.processor;
 
 import com.iluwatar.event.sourcing.api.DomainEvent;
@@ -9,29 +31,29 @@ import com.iluwatar.event.sourcing.api.ProcessorJournal;
  */
 public class DomainEventProcessor implements EventProcessor {
 
-    private ProcessorJournal precessorJournal;
+  private ProcessorJournal precessorJournal;
 
-    @Override
-    public void process(DomainEvent domainEvent) {
-            domainEvent.process();
-            precessorJournal.write(domainEvent);
-    }
+  @Override
+  public void process(DomainEvent domainEvent) {
+    domainEvent.process();
+    precessorJournal.write(domainEvent);
+  }
 
-    @Override
-    public void setPrecessorJournal(ProcessorJournal precessorJournal) {
-        this.precessorJournal = precessorJournal;
-    }
+  @Override
+  public void setPrecessorJournal(ProcessorJournal precessorJournal) {
+    this.precessorJournal = precessorJournal;
+  }
 
-    @Override
-    public void recover() {
-        DomainEvent domainEvent;
-        while(true) {
-            domainEvent = precessorJournal.readNext();
-            if(domainEvent==null){
-                break;
-            }else{
-                domainEvent.process();
-            }
-        }
+  @Override
+  public void recover() {
+    DomainEvent domainEvent;
+    while (true) {
+      domainEvent = precessorJournal.readNext();
+      if (domainEvent == null) {
+        break;
+      } else {
+        domainEvent.process();
+      }
     }
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/service/AccountService.java

@@ -1,22 +1,56 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.service;
 
 import com.iluwatar.event.sourcing.api.EventProcessor;
 import com.iluwatar.event.sourcing.event.AccountCreateEvent;
-
 import java.util.Date;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public class AccountService {
-    private EventProcessor eventProcessor;
 
-    public AccountService(EventProcessor eventProcessor) {
-        this.eventProcessor = eventProcessor;
-    }
+  private EventProcessor eventProcessor;
 
-    public void createAccount(int accountNo, String owner){
-        AccountCreateEvent accountCreateEvent = new AccountCreateEvent(SequenceIdGenerator.nextSequenceId(), new Date().getTime(),accountNo,owner);
-        eventProcessor.process(accountCreateEvent);
-    }
+  /**
+   * Instantiates a new Account service.
+   *
+   * @param eventProcessor the event processor
+   */
+  public AccountService(EventProcessor eventProcessor) {
+    this.eventProcessor = eventProcessor;
+  }
+
+  /**
+   * Create account.
+   *
+   * @param accountNo the account no
+   * @param owner the owner
+   */
+  public void createAccount(int accountNo, String owner) {
+    AccountCreateEvent accountCreateEvent = new AccountCreateEvent(
+        SequenceIdGenerator.nextSequenceId(), new Date().getTime(), accountNo, owner);
+    eventProcessor.process(accountCreateEvent);
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/service/MoneyTransactionService.java

@@ -1,10 +1,31 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.service;
 
 import com.iluwatar.event.sourcing.api.EventProcessor;
 import com.iluwatar.event.sourcing.event.MoneyDepositEvent;
 import com.iluwatar.event.sourcing.event.MoneyTransferEvent;
 import com.iluwatar.event.sourcing.event.MoneyWithdrawalEvent;
-
 import java.math.BigDecimal;
 import java.util.Date;
 
@@ -12,24 +33,53 @@ import java.util.Date;
  * Created by serdarh on 06.08.2017.
  */
 public class MoneyTransactionService {
-    private EventProcessor eventProcessor;
 
-    public MoneyTransactionService(EventProcessor eventProcessor) {
-        this.eventProcessor = eventProcessor;
-    }
+  private EventProcessor eventProcessor;
 
-    public void depositMoney(int accountNo, BigDecimal money){
-        MoneyDepositEvent moneyDepositEvent = new MoneyDepositEvent(SequenceIdGenerator.nextSequenceId(), new Date().getTime(), accountNo, money);
-        eventProcessor.process(moneyDepositEvent);
-    }
+  /**
+   * Instantiates a new Money transaction service.
+   *
+   * @param eventProcessor the event processor
+   */
+  public MoneyTransactionService(EventProcessor eventProcessor) {
+    this.eventProcessor = eventProcessor;
+  }
 
-    public void withdrawalMoney(int accountNo, BigDecimal money){
-        MoneyWithdrawalEvent moneyWithdrawalEvent = new MoneyWithdrawalEvent(SequenceIdGenerator.nextSequenceId(), new Date().getTime(), accountNo, money);
-        eventProcessor.process(moneyWithdrawalEvent);
-    }
+  /**
+   * Deposit money.
+   *
+   * @param accountNo the account no
+   * @param money the money
+   */
+  public void depositMoney(int accountNo, BigDecimal money) {
+    MoneyDepositEvent moneyDepositEvent = new MoneyDepositEvent(
+        SequenceIdGenerator.nextSequenceId(), new Date().getTime(), accountNo, money);
+    eventProcessor.process(moneyDepositEvent);
+  }
 
-    public void transferMoney(int accountNoFrom, int accountNoTo, BigDecimal money){
-        MoneyTransferEvent moneyTransferEvent = new MoneyTransferEvent(SequenceIdGenerator.nextSequenceId(), new Date().getTime(), money, accountNoFrom, accountNoTo);
-        eventProcessor.process(moneyTransferEvent);
-    }
+  /**
+   * Withdrawal money.
+   *
+   * @param accountNo the account no
+   * @param money the money
+   */
+  public void withdrawalMoney(int accountNo, BigDecimal money) {
+    MoneyWithdrawalEvent moneyWithdrawalEvent = new MoneyWithdrawalEvent(
+        SequenceIdGenerator.nextSequenceId(), new Date().getTime(), accountNo, money);
+    eventProcessor.process(moneyWithdrawalEvent);
+  }
+
+  /**
+   * Transfer money.
+   *
+   * @param accountNoFrom the account no from
+   * @param accountNoTo the account no to
+   * @param money the money
+   */
+  public void transferMoney(int accountNoFrom, int accountNoTo, BigDecimal money) {
+    MoneyTransferEvent moneyTransferEvent = new MoneyTransferEvent(
+        SequenceIdGenerator.nextSequenceId(), new Date().getTime(), money, accountNoFrom,
+        accountNoTo);
+    eventProcessor.process(moneyTransferEvent);
+  }
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/service/SequenceIdGenerator.java

@@ -1,14 +1,42 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.service;
 
 /**
  * Created by serdarh on 06.08.2017.
  */
 public class SequenceIdGenerator {
-    private static long sequenceId = 0L;
 
-    public static long nextSequenceId(){
-        sequenceId++;
-        return sequenceId;
-    }
+  private static long sequenceId = 0L;
+
+  /**
+   * Next sequence id long.
+   *
+   * @return the long
+   */
+  public static long nextSequenceId() {
+    sequenceId++;
+    return sequenceId;
+  }
 
 }

event-sourcing/src/main/java/com/iluwatar/event/sourcing/state/AccountAggregate.java

@@ -1,7 +1,28 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014 Ilkka Seppälä
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package com.iluwatar.event.sourcing.state;
 
 import com.iluwatar.event.sourcing.domain.Account;
-
 import java.util.HashMap;
 import java.util.Map;
 
@@ -9,21 +30,36 @@ import java.util.Map;
  * Created by serdarh on 06.08.2017.
  */
 public class AccountAggregate {
-    private static Map<Integer,Account> accounts = new HashMap<>();
 
-    public static void putAccount(Account account){
-        accounts.put(account.getAccountNo(), account);
-    }
+  private static Map<Integer, Account> accounts = new HashMap<>();
 
-    public static Account getAccount(int accountNo){
-        Account account = accounts.get(accountNo);
-        if(account == null){
-            return null;
-        }
-        return account.copy();
-    }
+  /**
+   * Put account.
+   *
+   * @param account the account
+   */
+  public static void putAccount(Account account) {
+    accounts.put(account.getAccountNo(), account);
+  }
 
-    public static void resetState(){
-        accounts = new HashMap<>();
+  /**
+   * Gets account.
+   *
+   * @param accountNo the account no
+   * @return the account
+   */
+  public static Account getAccount(int accountNo) {
+    Account account = accounts.get(accountNo);
+    if (account == null) {
+      return null;
     }
+    return account.copy();
+  }
+
+  /**
+   * Reset state.
+   */
+  public static void resetState() {
+    accounts = new HashMap<>();
+  }
 }