Resolves checkstyle issues for semaphore servant serverless service-layer service-locator (#1079)

* Reduces checkstyle errors in semaphore

* Reduces checkstyle errors in servant

* Reduces checkstyle errors in serverless

* Reduces checkstyle errors in service-layer

* Reduces checkstyle errors in service-locator

semaphore/src/main/java/com/iluwatar/semaphore/App.java

@@ -25,18 +25,17 @@ package com.iluwatar.semaphore;
 
 /**
  * A Semaphore mediates access by a group of threads to a pool of resources.
- * <p>
- * In this example a group of customers are taking fruit from a fruit shop.
- * There is a bowl each of apples, oranges and lemons. Only one customer can 
- * access a bowl simultaneously. A Semaphore is used to indicate how many 
- * resources are currently available and must be acquired in order for a bowl 
- * to be given to a customer. Customers continually try to take fruit until 
- * there is no fruit left in the shop. 
+ *
+ * <p>In this example a group of customers are taking fruit from a fruit shop. There is a bowl each
+ * of apples, oranges and lemons. Only one customer can access a bowl simultaneously. A Semaphore is
+ * used to indicate how many resources are currently available and must be acquired in order for a
+ * bowl to be given to a customer. Customers continually try to take fruit until there is no fruit
+ * left in the shop.
  */
 public class App {
-    
+
   /**
-   * main method
+   * main method.
    */
   public static void main(String[] args) {
     FruitShop shop = new FruitShop();
@@ -47,5 +46,5 @@ public class App {
     new Customer("Ringo", shop).start();
     new Customer("George", shop).start();
   }
-  
+
 }

semaphore/src/main/java/com/iluwatar/semaphore/Customer.java

@@ -27,8 +27,8 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * A Customer attempts to repeatedly take Fruit from the FruitShop by
- * taking Fruit from FruitBowl instances.
+ * A Customer attempts to repeatedly take Fruit from the FruitShop by taking Fruit from FruitBowl
+ * instances.
  */
 public class Customer extends Thread {
 
@@ -38,36 +38,35 @@ public class Customer extends Thread {
    * Name of the Customer.
    */
   private final String name;
-  
+
   /**
    * The FruitShop he is using.
    */
   private final FruitShop fruitShop;
-  
+
   /**
    * Their bowl of Fruit.
    */
   private final FruitBowl fruitBowl;
-  
+
   /**
-   * Customer constructor
+   * Customer constructor.
    */
   public Customer(String name, FruitShop fruitShop) {
     this.name = name;
     this.fruitShop = fruitShop;
     this.fruitBowl = new FruitBowl();
   }
-  
+
   /**
-   * The Customer repeatedly takes Fruit from the FruitShop until no Fruit
-   * remains.
-   */   
+   * The Customer repeatedly takes Fruit from the FruitShop until no Fruit remains.
+   */
   public void run() {
-        
+
     while (fruitShop.countFruit() > 0) {
       FruitBowl bowl = fruitShop.takeBowl();
       Fruit fruit;
-            
+
       if (bowl != null && (fruit = bowl.take()) != null) {
         LOGGER.info("{} took an {}", name, fruit);
         fruitBowl.put(fruit);
@@ -76,7 +75,7 @@ public class Customer extends Thread {
     }
 
     LOGGER.info("{} took {}", name, fruitBowl);
-        
+
   }
-    
+
 }

semaphore/src/main/java/com/iluwatar/semaphore/Fruit.java

@@ -29,7 +29,7 @@ package com.iluwatar.semaphore;
 public class Fruit {
 
   /**
-   * Enumeration of Fruit Types
+   * Enumeration of Fruit Types.
    */
   public enum FruitType {
     ORANGE, APPLE, LEMON
@@ -46,7 +46,7 @@ public class Fruit {
   }
 
   /**
-   * toString method
+   * toString method.
    */
   public String toString() {
     switch (type) {

semaphore/src/main/java/com/iluwatar/semaphore/FruitBowl.java

@@ -23,19 +23,20 @@
 
 package com.iluwatar.semaphore;
 
-import java.util.List;
 import java.util.ArrayList;
+import java.util.List;
 
 /**
- * A FruitBowl contains Fruit. 
+ * A FruitBowl contains Fruit.
  */
 public class FruitBowl {
-    
+
   private List<Fruit> fruit = new ArrayList<>();
 
   /**
-   * 
-   * @return The amount of Fruit left in the bowl. 
+   * Returns the amount of fruits left in bowl.
+   *
+   * @return The amount of Fruit left in the bowl.
    */
   public int countFruit() {
     return fruit.size();
@@ -43,15 +44,16 @@ public class FruitBowl {
 
   /**
    * Put an item of Fruit into the bowl.
-   * 
+   *
    * @param f fruit
    */
   public void put(Fruit f) {
     fruit.add(f);
   }
-  
+
   /**
    * Take an item of Fruit out of the bowl.
+   *
    * @return The Fruit taken out of the bowl, or null if empty.
    */
   public Fruit take() {
@@ -61,15 +63,15 @@ public class FruitBowl {
       return fruit.remove(0);
     }
   }
-  
+
   /**
-   * toString method
-   */   
+   * toString method.
+   */
   public String toString() {
     int apples = 0;
     int oranges = 0;
     int lemons = 0;
-        
+
     for (Fruit f : fruit) {
       switch (f.getType()) {
         case APPLE:
@@ -84,7 +86,7 @@ public class FruitBowl {
         default:
       }
     }
-        
+
     return apples + " Apples, " + oranges + " Oranges, and " + lemons + " Lemons";
   }
 }

semaphore/src/main/java/com/iluwatar/semaphore/FruitShop.java

@@ -27,32 +27,32 @@ package com.iluwatar.semaphore;
  * A FruitShop contains three FruitBowl instances and controls access to them.
  */
 public class FruitShop {
-   
+
   /**
    * The FruitBowl instances stored in the class.
    */
   private FruitBowl[] bowls = {
-    new FruitBowl(),
-    new FruitBowl(),
-    new FruitBowl()
+      new FruitBowl(),
+      new FruitBowl(),
+      new FruitBowl()
   };
 
   /**
    * Access flags for each of the FruitBowl instances.
    */
   private boolean[] available = {
-    true,
-    true,
-    true
+      true,
+      true,
+      true
   };
 
   /**
    * The Semaphore that controls access to the class resources.
    */
   private Semaphore semaphore;
-  
+
   /**
-   * FruitShop constructor
+   * FruitShop constructor.
    */
   public FruitShop() {
     for (int i = 0; i < 100; i++) {
@@ -60,30 +60,30 @@ public class FruitShop {
       bowls[1].put(new Fruit(Fruit.FruitType.ORANGE));
       bowls[2].put(new Fruit(Fruit.FruitType.LEMON));
     }
-        
+
     semaphore = new Semaphore(3);
   }
 
   /**
-   * 
+   * Returns the amount of fruits left in shop.
+   *
    * @return The amount of Fruit left in the shop.
    */
   public synchronized int countFruit() {
     return bowls[0].countFruit() + bowls[1].countFruit() + bowls[2].countFruit();
   }
-  
+
   /**
-   * Method called by Customer to get a FruitBowl from the shop. This method
-   * will try to acquire the Semaphore before returning the first available 
-   * FruitBowl.
-   */   
+   * Method called by Customer to get a FruitBowl from the shop. This method will try to acquire the
+   * Semaphore before returning the first available FruitBowl.
+   */
   public synchronized FruitBowl takeBowl() {
-        
+
     FruitBowl bowl = null;
-        
+
     try {
       semaphore.acquire();
-            
+
       if (available[0]) {
         bowl = bowls[0];
         available[0] = false;
@@ -94,7 +94,7 @@ public class FruitShop {
         bowl = bowls[2];
         available[2] = false;
       }
-            
+
     } catch (InterruptedException e) {
       e.printStackTrace();
     } finally {
@@ -102,20 +102,19 @@ public class FruitShop {
     }
     return bowl;
   }
-  
+
   /**
-   * Method called by a Customer instance to return a FruitBowl to the shop. 
-   * This method releases the Semaphore, making the FruitBowl available to 
-   * another Customer.
-   */   
+   * Method called by a Customer instance to return a FruitBowl to the shop. This method releases
+   * the Semaphore, making the FruitBowl available to another Customer.
+   */
   public synchronized void returnBowl(FruitBowl bowl) {
     if (bowl == bowls[0]) {
       available[0] = true;
     } else if (bowl == bowls[1]) {
       available[1] = true;
     } else if (bowl == bowls[2]) {
-      available [2] = true;
+      available[2] = true;
     }
   }
-    
+
 }

semaphore/src/main/java/com/iluwatar/semaphore/Lock.java

@@ -27,9 +27,9 @@ package com.iluwatar.semaphore;
  * Lock is an interface for a lock which can be acquired and released.
  */
 public interface Lock {
-    
+
   void acquire() throws InterruptedException;
-  
+
   void release();
-    
+
 }

semaphore/src/main/java/com/iluwatar/semaphore/Semaphore.java

@@ -33,30 +33,29 @@ public class Semaphore implements Lock {
    * The number of concurrent resource accesses which are allowed.
    */
   private int counter;
-    
+
   public Semaphore(int licenses) {
     this.licenses = licenses;
-    this.counter = licenses;    
+    this.counter = licenses;
   }
-  
+
   /**
-   * Returns the number of licenses managed by the Semaphore
+   * Returns the number of licenses managed by the Semaphore.
    */
   public int getNumLicenses() {
     return licenses;
   }
-  
+
   /**
-   * Returns the number of available licenses
+   * Returns the number of available licenses.
    */
   public int getAvailableLicenses() {
-    return counter; 
+    return counter;
   }
-  
+
   /**
-   * Method called by a thread to acquire the lock. If there are no resources
-   * available this will wait until the lock has been released to re-attempt
-   * the acquire.
+   * Method called by a thread to acquire the lock. If there are no resources available this will
+   * wait until the lock has been released to re-attempt the acquire.
    */
   public synchronized void acquire() throws InterruptedException {
     while (counter == 0) {
@@ -64,7 +63,7 @@ public class Semaphore implements Lock {
     }
     counter = counter - 1;
   }
-  
+
   /**
    * Method called by a thread to release the lock.
    */

servant/src/main/java/com/iluwatar/servant/App.java

@@ -23,29 +23,27 @@
 
 package com.iluwatar.servant;
 
+import java.util.List;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.List;
-
 
 /**
  * Servant offers some functionality to a group of classes without defining that functionality in
  * each of them. A Servant is a class whose instance provides methods that take care of a desired
  * service, while objects for which the servant does something, are taken as parameters.
- * <p>
- * In this example {@link Servant} is serving {@link King} and {@link Queen}.
  *
+ * <p>In this example {@link Servant} is serving {@link King} and {@link Queen}.
  */
 public class App {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
 
-  static Servant jenkins = new Servant("Jenkins");
-  static Servant travis = new Servant("Travis");
+  private static Servant jenkins = new Servant("Jenkins");
+  private static Servant travis = new Servant("Travis");
 
   /**
-   * Program entry point
+   * Program entry point.
    */
   public static void main(String[] args) {
     scenario(jenkins, 1);
@@ -53,7 +51,7 @@ public class App {
   }
 
   /**
-   * Can add a List with enum Actions for variable scenarios
+   * Can add a List with enum Actions for variable scenarios.
    */
   public static void scenario(Servant servant, int compliment) {
     King k = new King();

servant/src/main/java/com/iluwatar/servant/King.java

@@ -24,9 +24,7 @@
 package com.iluwatar.servant;
 
 /**
- * 
- * King
- *
+ * King.
  */
 public class King implements Royalty {
 

servant/src/main/java/com/iluwatar/servant/Queen.java

@@ -24,9 +24,7 @@
 package com.iluwatar.servant;
 
 /**
- * 
- * Queen
- *
+ * Queen.
  */
 public class Queen implements Royalty {
 

servant/src/main/java/com/iluwatar/servant/Royalty.java

@@ -24,9 +24,7 @@
 package com.iluwatar.servant;
 
 /**
- * 
- * Royalty
- *
+ * Royalty.
  */
 interface Royalty {
 

servant/src/main/java/com/iluwatar/servant/Servant.java

@@ -26,16 +26,14 @@ package com.iluwatar.servant;
 import java.util.List;
 
 /**
- * 
- * Servant
- *
+ * Servant.
  */
 public class Servant {
 
   public String name;
 
   /**
-   * Constructor
+   * Constructor.
    */
   public Servant(String name) {
     this.name = name;
@@ -54,7 +52,7 @@ public class Servant {
   }
 
   /**
-   * Check if we will be hanged
+   * Check if we will be hanged.
    */
   public boolean checkIfYouWillBeHanged(List<Royalty> tableGuests) {
     boolean anotherDay = true;

serverless/src/main/java/com/iluwatar/serverless/baas/api/AbstractDynamoDbHandler.java

@@ -30,13 +30,13 @@ import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper;
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-
 import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
 
 /**
- * abstract dynamodb handler
+ * abstract dynamodb handler.
+ *
  * @param <T> - serializable collection
  */
 public abstract class AbstractDynamoDbHandler<T extends Serializable> {
@@ -78,10 +78,10 @@ public abstract class AbstractDynamoDbHandler<T extends Serializable> {
   }
 
   /**
-   * API Gateway response
+   * API Gateway response.
    *
    * @param statusCode - status code
-   * @param body - Object body
+   * @param body       - Object body
    * @return - api gateway proxy response
    */
   protected APIGatewayProxyResponseEvent apiGatewayProxyResponseEvent(Integer statusCode, T body) {

serverless/src/main/java/com/iluwatar/serverless/baas/api/FindPersonApiHandler.java

@@ -28,14 +28,12 @@ import com.amazonaws.services.lambda.runtime.RequestHandler;
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent;
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;
 import com.iluwatar.serverless.baas.model.Person;
+import java.util.Map;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.Map;
-
 /**
- * find person from persons collection
- * Created by dheeraj.mummar on 3/5/18.
+ * find person from persons collection Created by dheeraj.mummar on 3/5/18.
  */
 public class FindPersonApiHandler extends AbstractDynamoDbHandler<Person>
     implements RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {
@@ -44,10 +42,11 @@ public class FindPersonApiHandler extends AbstractDynamoDbHandler<Person>
   private static final Integer SUCCESS_STATUS_CODE = 200;
 
   @Override
-  public APIGatewayProxyResponseEvent handleRequest(APIGatewayProxyRequestEvent apiGatewayProxyRequestEvent,
-                                                    Context context) {
+  public APIGatewayProxyResponseEvent handleRequest(
+      APIGatewayProxyRequestEvent apiGatewayProxyRequestEvent, Context context) {
     Map<String, String> pathParameters = apiGatewayProxyRequestEvent.getPathParameters();
-    pathParameters.keySet().stream().map(key -> key + "=" + pathParameters.get(key)).forEach(LOG::info);
+    pathParameters.keySet().stream().map(key -> key + "=" + pathParameters.get(key))
+        .forEach(LOG::info);
 
     Person person = this.getDynamoDbMapper().load(Person.class, apiGatewayProxyRequestEvent
         .getPathParameters().get("id"));

serverless/src/main/java/com/iluwatar/serverless/baas/api/SavePersonApiHandler.java

@@ -28,14 +28,12 @@ import com.amazonaws.services.lambda.runtime.RequestHandler;
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyRequestEvent;
 import com.amazonaws.services.lambda.runtime.events.APIGatewayProxyResponseEvent;
 import com.iluwatar.serverless.baas.model.Person;
+import java.io.IOException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.IOException;
-
 /**
- * save person into persons collection
- * Created by dheeraj.mummar on 3/4/18.
+ * save person into persons collection Created by dheeraj.mummar on 3/4/18.
  */
 public class SavePersonApiHandler extends AbstractDynamoDbHandler<Person>
     implements RequestHandler<APIGatewayProxyRequestEvent, APIGatewayProxyResponseEvent> {
@@ -45,8 +43,8 @@ public class SavePersonApiHandler extends AbstractDynamoDbHandler<Person>
   private static final Integer BAD_REQUEST_STATUS_CODE = 400;
 
   @Override
-  public APIGatewayProxyResponseEvent handleRequest(APIGatewayProxyRequestEvent
-                                                apiGatewayProxyRequestEvent, Context context) {
+  public APIGatewayProxyResponseEvent handleRequest(
+      APIGatewayProxyRequestEvent apiGatewayProxyRequestEvent, Context context) {
     APIGatewayProxyResponseEvent apiGatewayProxyResponseEvent;
     Person person;
     try {

serverless/src/main/java/com/iluwatar/serverless/baas/model/Address.java

@@ -25,12 +25,10 @@ package com.iluwatar.serverless.baas.model;
 
 import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAttribute;
 import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBDocument;
-
 import java.io.Serializable;
 
 /**
- * Address class
- * Created by dheeraj.mummarareddy on 3/4/18.
+ * Address class Created by dheeraj.mummarareddy on 3/4/18.
  */
 @DynamoDBDocument
 public class Address implements Serializable {

serverless/src/main/java/com/iluwatar/serverless/baas/model/Person.java

@@ -28,12 +28,10 @@ import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAutoGeneratedKey;
 import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBHashKey;
 import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBTable;
 import com.fasterxml.jackson.annotation.JsonProperty;
-
 import java.io.Serializable;
 
 /**
- * Person class
- * Created by dheeraj.mummarareddy on 3/4/18.
+ * Person class Created by dheeraj.mummarareddy on 3/4/18.
  */
 @DynamoDBTable(tableName = "persons")
 public class Person implements Serializable {

serverless/src/main/java/com/iluwatar/serverless/faas/ApiGatewayResponse.java

@@ -25,12 +25,11 @@ package com.iluwatar.serverless.faas;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
-
 import java.io.Serializable;
 import java.util.Map;
 
 /**
- * Api gateway response
+ * Api gateway response.
  *
  * @param <T> serializable object
  */
@@ -44,11 +43,11 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
   private final Boolean isBase64Encoded;
 
   /**
-   * api gateway response
+   * api gateway response.
    *
-   * @param statusCode - http status code
-   * @param body - response body
-   * @param headers - response headers
+   * @param statusCode      - http status code
+   * @param body            - response body
+   * @param headers         - response headers
    * @param isBase64Encoded - base64Encoded flag
    */
   public ApiGatewayResponse(Integer statusCode, String body, Map<String, String> headers,
@@ -60,7 +59,7 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
   }
 
   /**
-   * http status code
+   * http status code.
    *
    * @return statusCode - http status code
    */
@@ -69,7 +68,7 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
   }
 
   /**
-   * response body
+   * response body.
    *
    * @return string body
    */
@@ -78,7 +77,7 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
   }
 
   /**
-   * response headers
+   * response headers.
    *
    * @return response headers
    */
@@ -87,7 +86,7 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
   }
 
   /**
-   * base64Encoded flag, API Gateway expects the property to be called "isBase64Encoded"
+   * base64Encoded flag, API Gateway expects the property to be called "isBase64Encoded".
    *
    * @return base64Encoded flag
    */
@@ -96,7 +95,8 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
   }
 
   /**
-   * ApiGatewayResponse Builder class
+   * ApiGatewayResponse Builder class.
+   *
    * @param <T> Serializable object
    */
   public static class ApiGatewayResponseBuilder<T extends Serializable> {
@@ -107,7 +107,8 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
     private Boolean isBase64Encoded;
 
     /**
-     * http status code
+     * http status code.
+     *
      * @param statusCode - http status code
      * @return ApiGatewayResponseBuilder
      */
@@ -117,7 +118,8 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
     }
 
     /**
-     * Serializable body
+     * Serializable body.
+     *
      * @param body - Serializable object
      * @return ApiGatewayResponseBuilder
      */
@@ -127,7 +129,8 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
     }
 
     /**
-     * response headers
+     * response headers.
+     *
      * @param headers - response headers
      * @return ApiGatewayResponseBuilder
      */
@@ -137,7 +140,8 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
     }
 
     /**
-     * base64Encoded glag
+     * base64Encoded flag.
+     *
      * @param isBase64Encoded - base64Encoded flag
      * @return ApiGatewayResponseBuilder
      */
@@ -147,7 +151,7 @@ public class ApiGatewayResponse<T extends Serializable> implements Serializable
     }
 
     /**
-     * build ApiGatewayResponse
+     * build ApiGatewayResponse.
      *
      * @return ApiGatewayResponse
      */

serverless/src/main/java/com/iluwatar/serverless/faas/LambdaInfo.java

@@ -26,7 +26,7 @@ package com.iluwatar.serverless.faas;
 import java.io.Serializable;
 
 /**
- * Lambda context information
+ * Lambda context information.
  */
 public class LambdaInfo implements Serializable {
 
@@ -110,22 +110,28 @@ public class LambdaInfo implements Serializable {
 
     LambdaInfo that = (LambdaInfo) o;
 
-    if (awsRequestId != null ? !awsRequestId.equals(that.awsRequestId) : that.awsRequestId != null) {
+    if (awsRequestId != null ? !awsRequestId
+        .equals(that.awsRequestId) : that.awsRequestId != null) {
       return false;
     }
-    if (logGroupName != null ? !logGroupName.equals(that.logGroupName) : that.logGroupName != null) {
+    if (logGroupName != null ? !logGroupName
+        .equals(that.logGroupName) : that.logGroupName != null) {
       return false;
     }
-    if (logStreamName != null ? !logStreamName.equals(that.logStreamName) : that.logStreamName != null) {
+    if (logStreamName != null ? !logStreamName
+        .equals(that.logStreamName) : that.logStreamName != null) {
       return false;
     }
-    if (functionName != null ? !functionName.equals(that.functionName) : that.functionName != null) {
+    if (functionName != null ? !functionName
+        .equals(that.functionName) : that.functionName != null) {
       return false;
     }
-    if (functionVersion != null ? !functionVersion.equals(that.functionVersion) : that.functionVersion != null) {
+    if (functionVersion != null ? !functionVersion
+        .equals(that.functionVersion) : that.functionVersion != null) {
       return false;
     }
-    return memoryLimitInMb != null ? memoryLimitInMb.equals(that.memoryLimitInMb) : that.memoryLimitInMb == null;
+    return memoryLimitInMb != null ? memoryLimitInMb
+        .equals(that.memoryLimitInMb) : that.memoryLimitInMb == null;
   }
 
   @Override

serverless/src/main/java/com/iluwatar/serverless/faas/api/LambdaInfoApiHandler.java

@@ -23,22 +23,20 @@
 
 package com.iluwatar.serverless.faas.api;
 
-import com.iluwatar.serverless.faas.ApiGatewayResponse;
-
 import com.amazonaws.services.lambda.runtime.Context;
 import com.amazonaws.services.lambda.runtime.RequestHandler;
+import com.iluwatar.serverless.faas.ApiGatewayResponse;
 import com.iluwatar.serverless.faas.LambdaInfo;
+import java.util.HashMap;
+import java.util.Map;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.HashMap;
-import java.util.Map;
-
 /**
- * LambdaInfoApiHandler - simple api to get lambda context
- * Created by dheeraj.mummar on 2/5/18.
+ * LambdaInfoApiHandler - simple api to get lambda context Created by dheeraj.mummar on 2/5/18.
  */
-public class LambdaInfoApiHandler implements RequestHandler<Map<String, Object>, ApiGatewayResponse> {
+public class LambdaInfoApiHandler
+    implements RequestHandler<Map<String, Object>, ApiGatewayResponse> {
 
   private static final Logger LOG = LoggerFactory.getLogger(LambdaInfoApiHandler.class);
   private static final Integer SUCCESS_STATUS_CODE = 200;
@@ -49,16 +47,17 @@ public class LambdaInfoApiHandler implements RequestHandler<Map<String, Object>,
     LOG.info("received: " + input);
 
     return new ApiGatewayResponse
-            .ApiGatewayResponseBuilder<LambdaInfo>()
-            .headers(headers())
-            .statusCode(SUCCESS_STATUS_CODE)
-            .body(lambdaInfo(context))
-            .build();
+        .ApiGatewayResponseBuilder<LambdaInfo>()
+        .headers(headers())
+        .statusCode(SUCCESS_STATUS_CODE)
+        .body(lambdaInfo(context))
+        .build();
 
   }
 
   /**
-   * lambdaInfo
+   * lambdaInfo.
+   *
    * @param context - Lambda context
    * @return LambdaInfo
    */

service-layer/src/main/java/com/iluwatar/servicelayer/app/App.java

@@ -23,19 +23,15 @@
 
 package com.iluwatar.servicelayer.app;
 
-import java.util.List;
-
 import com.iluwatar.servicelayer.magic.MagicService;
 import com.iluwatar.servicelayer.magic.MagicServiceImpl;
 import com.iluwatar.servicelayer.spell.Spell;
-import com.iluwatar.servicelayer.spell.SpellDao;
 import com.iluwatar.servicelayer.spell.SpellDaoImpl;
 import com.iluwatar.servicelayer.spellbook.Spellbook;
-import com.iluwatar.servicelayer.spellbook.SpellbookDao;
 import com.iluwatar.servicelayer.spellbook.SpellbookDaoImpl;
 import com.iluwatar.servicelayer.wizard.Wizard;
-import com.iluwatar.servicelayer.wizard.WizardDao;
 import com.iluwatar.servicelayer.wizard.WizardDaoImpl;
+import java.util.List;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -43,28 +39,27 @@ import org.slf4j.LoggerFactory;
 /**
  * Service layer defines an application's boundary with a layer of services that establishes a set
  * of available operations and coordinates the application's response in each operation.
- * <p>
- * Enterprise applications typically require different kinds of interfaces to the data they store
- * and the logic they implement: data loaders, user interfaces, integration gateways, and others.
- * Despite their different purposes, these interfaces often need common interactions with the
- * application to access and manipulate its data and invoke its business logic. The interactions may
- * be complex, involving transactions across multiple resources and the coordination of several
+ *
+ * <p>Enterprise applications typically require different kinds of interfaces to the data they
+ * store and the logic they implement: data loaders, user interfaces, integration gateways, and
+ * others. Despite their different purposes, these interfaces often need common interactions with
+ * the application to access and manipulate its data and invoke its business logic. The interactions
+ * may be complex, involving transactions across multiple resources and the coordination of several
  * responses to an action. Encoding the logic of the interactions separately in each interface
  * causes a lot of duplication.
- * <p>
- * The example application demonstrates interactions between a client ({@link App}) and a service (
- * {@link MagicService}). The service is implemented with 3-layer architecture (entity, dao,
- * service). For persistence the example uses in-memory H2 database which is populated on each
- * application startup.
  *
+ * <p>The example application demonstrates interactions between a client ({@link App}) and a
+ * service ({@link MagicService}). The service is implemented with 3-layer architecture (entity,
+ * dao, service). For persistence the example uses in-memory H2 database which is populated on each
+ * application startup.
  */
 public class App {
 
   private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
 
   /**
-   * Program entry point
-   * 
+   * Program entry point.
+   *
    * @param args command line args
    */
   public static void main(String[] args) {
@@ -75,7 +70,7 @@ public class App {
   }
 
   /**
-   * Initialize data
+   * Initialize data.
    */
   public static void initData() {
     // spells
@@ -180,7 +175,7 @@ public class App {
   }
 
   /**
-   * Query the data
+   * Query the data.
    */
   public static void queryData() {
     var service =

service-layer/src/main/java/com/iluwatar/servicelayer/common/BaseEntity.java

@@ -28,37 +28,35 @@ import javax.persistence.InheritanceType;
 import javax.persistence.MappedSuperclass;
 
 /**
- *
  * Base class for entities.
- *
  */
 @MappedSuperclass
 @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
 public abstract class BaseEntity {
 
   /**
-   * Indicates the unique id of this entity
+   * Indicates the unique id of this entity.
    *
    * @return The id of the entity, or 'null' when not persisted
    */
   public abstract Long getId();
 
   /**
-   * Set the id of this entity
+   * Set the id of this entity.
    *
    * @param id The new id
    */
   public abstract void setId(Long id);
 
   /**
-   * Get the name of this entity
+   * Get the name of this entity.
    *
    * @return The name of the entity
    */
   public abstract String getName();
 
   /**
-   * Set the name of this entity
+   * Set the name of this entity.
    *
    * @param name The new name
    */

service-layer/src/main/java/com/iluwatar/servicelayer/common/Dao.java

@@ -26,11 +26,9 @@ package com.iluwatar.servicelayer.common;
 import java.util.List;
 
 /**
- * 
  * Dao interface.
  *
- * @param <E>
- * 
+ * @param <E> Type of Entity
  */
 public interface Dao<E extends BaseEntity> {
 

service-layer/src/main/java/com/iluwatar/servicelayer/common/DaoBaseImpl.java

@@ -23,23 +23,18 @@
 
 package com.iluwatar.servicelayer.common;
 
+import com.iluwatar.servicelayer.hibernate.HibernateUtil;
 import java.lang.reflect.ParameterizedType;
 import java.util.List;
-
 import org.hibernate.Criteria;
-import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.Transaction;
 import org.hibernate.criterion.Restrictions;
 
-import com.iluwatar.servicelayer.hibernate.HibernateUtil;
-
 /**
- * 
  * Base class for Dao implementations.
  *
- * @param <E>
- * 
+ * @param <E> Type of Entity
  */
 public abstract class DaoBaseImpl<E extends BaseEntity> implements Dao<E> {
 

service-layer/src/main/java/com/iluwatar/servicelayer/hibernate/HibernateUtil.java

@@ -26,7 +26,6 @@ package com.iluwatar.servicelayer.hibernate;
 import com.iluwatar.servicelayer.spell.Spell;
 import com.iluwatar.servicelayer.spellbook.Spellbook;
 import com.iluwatar.servicelayer.wizard.Wizard;
-
 import org.hibernate.SessionFactory;
 import org.hibernate.cfg.Configuration;
 import org.slf4j.Logger;
@@ -40,7 +39,7 @@ public final class HibernateUtil {
   private static final Logger LOGGER = LoggerFactory.getLogger(HibernateUtil.class);
 
   /**
-   * The cached session factory
+   * The cached session factory.
    */
   private static volatile SessionFactory sessionFactory;
 

service-layer/src/main/java/com/iluwatar/servicelayer/magic/MagicService.java

@@ -23,17 +23,14 @@
 
 package com.iluwatar.servicelayer.magic;
 
-import java.util.List;
-
 import com.iluwatar.servicelayer.spell.Spell;
 import com.iluwatar.servicelayer.spellbook.Spellbook;
 import com.iluwatar.servicelayer.wizard.Wizard;
+import java.util.List;
 
 
 /**
- * 
  * Service interface.
- *
  */
 public interface MagicService {
 

service-layer/src/main/java/com/iluwatar/servicelayer/magic/MagicServiceImpl.java

@@ -23,20 +23,17 @@
 
 package com.iluwatar.servicelayer.magic;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import com.iluwatar.servicelayer.spell.Spell;
 import com.iluwatar.servicelayer.spell.SpellDao;
 import com.iluwatar.servicelayer.spellbook.Spellbook;
 import com.iluwatar.servicelayer.spellbook.SpellbookDao;
 import com.iluwatar.servicelayer.wizard.Wizard;
 import com.iluwatar.servicelayer.wizard.WizardDao;
+import java.util.ArrayList;
+import java.util.List;
 
 /**
- * 
  * Service implementation.
- *
  */
 public class MagicServiceImpl implements MagicService {
 
@@ -45,7 +42,7 @@ public class MagicServiceImpl implements MagicService {
   private SpellDao spellDao;
 
   /**
-   * Constructor
+   * Constructor.
    */
   public MagicServiceImpl(WizardDao wizardDao, SpellbookDao spellbookDao, SpellDao spellDao) {
     this.wizardDao = wizardDao;

service-layer/src/main/java/com/iluwatar/servicelayer/spell/Spell.java

@@ -23,6 +23,8 @@
 
 package com.iluwatar.servicelayer.spell;
 
+import com.iluwatar.servicelayer.common.BaseEntity;
+import com.iluwatar.servicelayer.spellbook.Spellbook;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
@@ -31,13 +33,8 @@ import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
 import javax.persistence.Table;
 
-import com.iluwatar.servicelayer.common.BaseEntity;
-import com.iluwatar.servicelayer.spellbook.Spellbook;
-
 /**
- * 
  * Spell entity.
- *
  */
 @Entity
 @Table(name = "SPELL")
@@ -54,13 +51,14 @@ public class Spell extends BaseEntity {
   @JoinColumn(name = "SPELLBOOK_ID_FK", referencedColumnName = "SPELLBOOK_ID")
   private Spellbook spellbook;
 
-  public Spell() {}
+  public Spell() {
+  }
 
   public Spell(String name) {
     this();
     this.name = name;
   }
-  
+
   public Long getId() {
     return id;
   }
@@ -68,7 +66,7 @@ public class Spell extends BaseEntity {
   public void setId(Long id) {
     this.id = id;
   }
-  
+
   public String getName() {
     return name;
   }

service-layer/src/main/java/com/iluwatar/servicelayer/spell/SpellDao.java

@@ -26,9 +26,7 @@ package com.iluwatar.servicelayer.spell;
 import com.iluwatar.servicelayer.common.Dao;
 
 /**
- * 
  * SpellDao interface.
- *
  */
 public interface SpellDao extends Dao<Spell> {
 

service-layer/src/main/java/com/iluwatar/servicelayer/spell/SpellDaoImpl.java

@@ -24,16 +24,11 @@
 package com.iluwatar.servicelayer.spell;
 
 import com.iluwatar.servicelayer.common.DaoBaseImpl;
-
-import org.hibernate.Criteria;
-import org.hibernate.Session;
 import org.hibernate.Transaction;
 import org.hibernate.criterion.Restrictions;
 
 /**
- * 
  * SpellDao implementation.
- *
  */
 public class SpellDaoImpl extends DaoBaseImpl<Spell> implements SpellDao {
 

service-layer/src/main/java/com/iluwatar/servicelayer/spellbook/Spellbook.java

@@ -23,9 +23,11 @@
 
 package com.iluwatar.servicelayer.spellbook;
 
+import com.iluwatar.servicelayer.common.BaseEntity;
+import com.iluwatar.servicelayer.spell.Spell;
+import com.iluwatar.servicelayer.wizard.Wizard;
 import java.util.HashSet;
 import java.util.Set;
-
 import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
@@ -36,14 +38,8 @@ import javax.persistence.ManyToMany;
 import javax.persistence.OneToMany;
 import javax.persistence.Table;
 
-import com.iluwatar.servicelayer.common.BaseEntity;
-import com.iluwatar.servicelayer.spell.Spell;
-import com.iluwatar.servicelayer.wizard.Wizard;
-
 /**
- * 
  * Spellbook entity.
- *
  */
 @Entity
 @Table(name = "SPELLBOOK")
@@ -71,7 +67,7 @@ public class Spellbook extends BaseEntity {
     this();
     this.name = name;
   }
-  
+
   public Long getId() {
     return id;
   }
@@ -79,7 +75,7 @@ public class Spellbook extends BaseEntity {
   public void setId(Long id) {
     this.id = id;
   }
-  
+
   public String getName() {
     return name;
   }

service-layer/src/main/java/com/iluwatar/servicelayer/spellbook/SpellbookDao.java

@@ -26,9 +26,7 @@ package com.iluwatar.servicelayer.spellbook;
 import com.iluwatar.servicelayer.common.Dao;
 
 /**
- * 
  * SpellbookDao interface.
- *
  */
 public interface SpellbookDao extends Dao<Spellbook> {
 

service-layer/src/main/java/com/iluwatar/servicelayer/spellbook/SpellbookDaoImpl.java

@@ -23,17 +23,12 @@
 
 package com.iluwatar.servicelayer.spellbook;
 
-import org.hibernate.Criteria;
-import org.hibernate.Session;
+import com.iluwatar.servicelayer.common.DaoBaseImpl;
 import org.hibernate.Transaction;
 import org.hibernate.criterion.Restrictions;
 
-import com.iluwatar.servicelayer.common.DaoBaseImpl;
-
 /**
- * 
  * SpellbookDao implementation.
- *
  */
 public class SpellbookDaoImpl extends DaoBaseImpl<Spellbook> implements SpellbookDao {
 

service-layer/src/main/java/com/iluwatar/servicelayer/wizard/Wizard.java

@@ -23,9 +23,10 @@
 
 package com.iluwatar.servicelayer.wizard;
 
+import com.iluwatar.servicelayer.common.BaseEntity;
+import com.iluwatar.servicelayer.spellbook.Spellbook;
 import java.util.HashSet;
 import java.util.Set;
-
 import javax.persistence.CascadeType;
 import javax.persistence.Column;
 import javax.persistence.Entity;
@@ -34,13 +35,8 @@ import javax.persistence.Id;
 import javax.persistence.ManyToMany;
 import javax.persistence.Table;
 
-import com.iluwatar.servicelayer.common.BaseEntity;
-import com.iluwatar.servicelayer.spellbook.Spellbook;
-
 /**
- * 
  * Wizard entity.
- *
  */
 @Entity
 @Table(name = "WIZARD")
@@ -64,7 +60,7 @@ public class Wizard extends BaseEntity {
     this();
     this.name = name;
   }
-  
+
   public Long getId() {
     return id;
   }
@@ -72,7 +68,7 @@ public class Wizard extends BaseEntity {
   public void setId(Long id) {
     this.id = id;
   }
-  
+
   public String getName() {
     return name;
   }

service-layer/src/main/java/com/iluwatar/servicelayer/wizard/WizardDao.java

@@ -26,9 +26,7 @@ package com.iluwatar.servicelayer.wizard;
 import com.iluwatar.servicelayer.common.Dao;
 
 /**
- * 
  * WizardDao interface.
- *
  */
 public interface WizardDao extends Dao<Wizard> {
 

service-layer/src/main/java/com/iluwatar/servicelayer/wizard/WizardDaoImpl.java

@@ -23,18 +23,15 @@
 
 package com.iluwatar.servicelayer.wizard;
 
+import com.iluwatar.servicelayer.common.DaoBaseImpl;
+import com.iluwatar.servicelayer.spellbook.Spellbook;
 import org.hibernate.Criteria;
 import org.hibernate.Session;
 import org.hibernate.Transaction;
 import org.hibernate.criterion.Restrictions;
 
-import com.iluwatar.servicelayer.common.DaoBaseImpl;
-import com.iluwatar.servicelayer.spellbook.Spellbook;
-
 /**
- * 
  * WizardDao implementation.
- *
  */
 public class WizardDaoImpl extends DaoBaseImpl<Wizard> implements WizardDao {
 

service-locator/src/main/java/com/iluwatar/servicelocator/App.java

@@ -24,24 +24,22 @@
 package com.iluwatar.servicelocator;
 
 /**
- * 
  * The Service Locator pattern is a design pattern used in software development to encapsulate the
  * processes involved in obtaining a service with a strong abstraction layer. This pattern uses a
  * central registry known as the "service locator", which on request returns the information
  * necessary to perform a certain task.
- * <p>
- * In this example we use the Service locator pattern to lookup JNDI-services and cache them for
+ *
+ * <p>In this example we use the Service locator pattern to lookup JNDI-services and cache them for
  * subsequent requests.
- * <p>
- * 
+ * <br>
+ *
  * @author saifasif
- * 
  */
 public class App {
 
   /**
-   * Program entry point
-   * 
+   * Program entry point.
+   *
    * @param args command line args
    */
   public static void main(String[] args) {

service-locator/src/main/java/com/iluwatar/servicelocator/Service.java

@@ -25,10 +25,10 @@ package com.iluwatar.servicelocator;
 
 /**
  * This is going to be the parent service interface which we will use to create our services. All
- * services will have a <ul><li>service name</li> <li>unique id</li> <li>execution work flow</li></ul>
- * 
- * @author saifasif
+ * services will have a <ul><li>service name</li> <li>unique id</li> <li>execution work
+ * flow</li></ul>
  *
+ * @author saifasif
  */
 public interface Service {
 

service-locator/src/main/java/com/iluwatar/servicelocator/ServiceCache.java

@@ -23,11 +23,10 @@
 
 package com.iluwatar.servicelocator;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.util.HashMap;
 import java.util.Map;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * The service cache implementation which will cache services that are being created. On first hit,
@@ -59,14 +58,14 @@ public class ServiceCache {
       if (serviceJndiName.equals(serviceName)) {
         cachedService = serviceCache.get(serviceJndiName);
         LOGGER.info("(cache call) Fetched service {}({}) from cache... !",
-                cachedService.getName(), cachedService.getId());
+            cachedService.getName(), cachedService.getId());
       }
     }
     return cachedService;
   }
 
   /**
-   * Adds the service into the cache map
+   * Adds the service into the cache map.
    *
    * @param newService a {@link Service}
    */

service-locator/src/main/java/com/iluwatar/servicelocator/ServiceImpl.java

@@ -41,7 +41,7 @@ public class ServiceImpl implements Service {
   private final int id;
 
   /**
-   * Constructor
+   * Constructor.
    */
   public ServiceImpl(String serviceName) {
     // set the service name