Resolves checkstyle errors for event-* (#1070)

* Reduces checkstyle errors in event-aggregator

* Reduces checkstyle errors in event-asynchronous

* Reduces checkstyle errors in event-driven-architecture

* Reduces checkstyle errors in event-queue

* Reduces checkstyle errors in event-sourcing

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

@@ -42,13 +42,13 @@ import org.slf4j.LoggerFactory;
  * transactional data, and maintain full audit trails and history that can enable compensating
  * actions.
  *
- * This App class is an example usage of Event Sourcing pattern. As an example, two bank account is
- * created, then some money deposit and transfer actions are taken so a new state of accounts is
+ * <p>This App class is an example usage of Event Sourcing pattern. As an example, two bank account
+ * is created, then some money deposit and transfer actions are taken so a new state of accounts is
  * created. At that point, state is cleared in order to represent a system shot down. After the shot
  * down, system state is recovered by re-creating the past events from event journal. Then state is
  * printed so a user can view the last state is same with the state before system shot down.
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class App {
 
@@ -86,10 +86,10 @@ public class App {
     LOGGER.info("Do some money operations............");
 
     eventProcessor.process(new MoneyDepositEvent(
-        2, new Date().getTime(), ACCOUNT_OF_DAENERYS,  new BigDecimal("100000")));
+        2, new Date().getTime(), ACCOUNT_OF_DAENERYS, new BigDecimal("100000")));
 
     eventProcessor.process(new MoneyDepositEvent(
-        3, new Date().getTime(), ACCOUNT_OF_JON,  new BigDecimal("100")));
+        3, new Date().getTime(), ACCOUNT_OF_JON, new BigDecimal("100")));
 
     eventProcessor.process(new MoneyTransferEvent(
         4, new Date().getTime(), new BigDecimal("10000"), ACCOUNT_OF_DAENERYS,

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

@@ -32,11 +32,11 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * This is the Account class that holds the account info, the account number,
- * account owner name and money of the account. Account class also have the business logic of events
- * that effects this account.
+ * This is the Account class that holds the account info, the account number, account owner name and
+ * money of the account. Account class also have the business logic of events that effects this
+ * account.
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class Account {
 
@@ -45,14 +45,15 @@ public class Account {
   private final int accountNo;
   private final String owner;
   private BigDecimal money;
-  
-  private static final String MSG = "Some external api for only realtime execution could be called here.";
+
+  private static final String MSG =
+      "Some external api for only realtime execution could be called here.";
 
   /**
    * Instantiates a new Account.
    *
    * @param accountNo the account no
-   * @param owner the owner
+   * @param owner     the owner
    */
   public Account(int accountNo, String owner) {
     this.accountNo = accountNo;

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

@@ -27,12 +27,11 @@ import com.iluwatar.event.sourcing.domain.Account;
 import com.iluwatar.event.sourcing.state.AccountAggregate;
 
 /**
- * This is the class that implements account create event.
- * Holds the necessary info for an account create event.
- * Implements the process function that finds the event related
- * domain objects and calls the related domain object's handle event functions
+ * This is the class that implements account create event. Holds the necessary info for an account
+ * create event. Implements the process function that finds the event related domain objects and
+ * calls the related domain object's handle event functions
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class AccountCreateEvent extends DomainEvent {
 
@@ -42,10 +41,10 @@ public class AccountCreateEvent extends DomainEvent {
   /**
    * Instantiates a new Account create event.
    *
-   * @param sequenceId the sequence id
+   * @param sequenceId  the sequence id
    * @param createdTime the created time
-   * @param accountNo the account no
-   * @param owner the owner
+   * @param accountNo   the account no
+   * @param owner       the owner
    */
   public AccountCreateEvent(long sequenceId, long createdTime, int accountNo, String owner) {
     super(sequenceId, createdTime, "AccountCreateEvent");

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

@@ -28,7 +28,7 @@ import java.io.Serializable;
 /**
  * This is the base class for domain events. All events must extend this class.
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public abstract class DomainEvent implements Serializable {
 
@@ -40,8 +40,8 @@ public abstract class DomainEvent implements Serializable {
   /**
    * Instantiates a new Domain event.
    *
-   * @param sequenceId the sequence id
-   * @param createdTime the created time
+   * @param sequenceId     the sequence id
+   * @param createdTime    the created time
    * @param eventClassName the event class name
    */
   public DomainEvent(long sequenceId, long createdTime, String eventClassName) {

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

@@ -28,12 +28,11 @@ import com.iluwatar.event.sourcing.state.AccountAggregate;
 import java.math.BigDecimal;
 
 /**
- * This is the class that implements money deposit event.
- * Holds the necessary info for a money deposit event.
- * Implements the process function that finds the event related
- * domain objects and calls the related domain object's handle event functions
+ * This is the class that implements money deposit event. Holds the necessary info for a money
+ * deposit event. Implements the process function that finds the event related domain objects and
+ * calls the related domain object's handle event functions
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class MoneyDepositEvent extends DomainEvent {
 
@@ -43,10 +42,10 @@ public class MoneyDepositEvent extends DomainEvent {
   /**
    * Instantiates a new Money deposit event.
    *
-   * @param sequenceId the sequence id
+   * @param sequenceId  the sequence id
    * @param createdTime the created time
-   * @param accountNo the account no
-   * @param money the money
+   * @param accountNo   the account no
+   * @param money       the money
    */
   public MoneyDepositEvent(long sequenceId, long createdTime, int accountNo, BigDecimal money) {
     super(sequenceId, createdTime, "MoneyDepositEvent");

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

@@ -28,12 +28,11 @@ import com.iluwatar.event.sourcing.state.AccountAggregate;
 import java.math.BigDecimal;
 
 /**
- * This is the class that implements money transfer event.
- * Holds the necessary info for a money transfer event.
- * Implements the process function that finds the event related
- * domain objects and calls the related domain object's handle event functions
+ * This is the class that implements money transfer event. Holds the necessary info for a money
+ * transfer event. Implements the process function that finds the event related domain objects and
+ * calls the related domain object's handle event functions
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class MoneyTransferEvent extends DomainEvent {
 
@@ -44,14 +43,14 @@ public class MoneyTransferEvent extends DomainEvent {
   /**
    * Instantiates a new Money transfer event.
    *
-   * @param sequenceId the sequence id
-   * @param createdTime the created time
-   * @param money the money
+   * @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
+   * @param accountNoTo   the account no to
    */
   public MoneyTransferEvent(long sequenceId, long createdTime, BigDecimal money, int accountNoFrom,
-      int accountNoTo) {
+                            int accountNoTo) {
     super(sequenceId, createdTime, "MoneyTransferEvent");
     this.money = money;
     this.accountNoFrom = accountNoFrom;

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

@@ -26,11 +26,10 @@ package com.iluwatar.event.sourcing.processor;
 import com.iluwatar.event.sourcing.event.DomainEvent;
 
 /**
- * This is the implementation of event processor.
- * All events are processed by this class.
- * This processor uses processorJournal to persist and recover events.
+ * This is the implementation of event processor. All events are processed by this class. This
+ * processor uses processorJournal to persist and recover events.
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class DomainEventProcessor {
 

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

@@ -43,15 +43,14 @@ import java.util.ArrayList;
 import java.util.List;
 
 /**
- * This is the implementation of event journal.
- * This implementation serialize/deserialize the events with JSON
- * and writes/reads them on a Journal.json file at the working directory.
+ * This is the implementation of event journal. This implementation serialize/deserialize the events
+ * with JSON and writes/reads them on a Journal.json file at the working directory.
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class JsonFileJournal {
 
-  private final File aFile;
+  private final File file;
   private final List<String> events = new ArrayList<>();
   private int index = 0;
 
@@ -59,10 +58,10 @@ public class JsonFileJournal {
    * Instantiates a new Json file journal.
    */
   public JsonFileJournal() {
-    aFile = new File("Journal.json");
-    if (aFile.exists()) {
+    file = new File("Journal.json");
+    if (file.exists()) {
       try (BufferedReader input = new BufferedReader(
-          new InputStreamReader(new FileInputStream(aFile), "UTF-8"))) {
+          new InputStreamReader(new FileInputStream(file), "UTF-8"))) {
         String line;
         while ((line = input.readLine()) != null) {
           events.add(line);
@@ -88,14 +87,14 @@ public class JsonFileJournal {
       jsonElement = gson.toJsonTree(domainEvent, AccountCreateEvent.class);
     } else if (domainEvent instanceof MoneyDepositEvent) {
       jsonElement = gson.toJsonTree(domainEvent, MoneyDepositEvent.class);
-    }  else if (domainEvent instanceof MoneyTransferEvent) {
+    } 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"))) {
+        new OutputStreamWriter(new FileOutputStream(file, true), "UTF-8"))) {
       String eventString = jsonElement.toString();
       output.write(eventString + "\r\n");
     } catch (IOException e) {
@@ -108,7 +107,7 @@ public class JsonFileJournal {
    * Reset.
    */
   public void reset() {
-    aFile.delete();
+    file.delete();
   }
 
 
@@ -135,7 +134,7 @@ public class JsonFileJournal {
       domainEvent = gson.fromJson(jsonElement, MoneyDepositEvent.class);
     } else if (eventClassName.equals("MoneyTransferEvent")) {
       domainEvent = gson.fromJson(jsonElement, MoneyTransferEvent.class);
-    }  else {
+    } else {
       throw new RuntimeException("Journal Event not recegnized");
     }
 

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

@@ -28,10 +28,9 @@ import java.util.HashMap;
 import java.util.Map;
 
 /**
- * This is the static accounts map holder class.
- * This class holds the state of the accounts.
+ * This is the static accounts map holder class. This class holds the state of the accounts.
  *
- * Created by Serdar Hamzaogullari on 06.08.2017.
+ * <p>Created by Serdar Hamzaogullari on 06.08.2017.
  */
 public class AccountAggregate {