Resolves checkstyle errors for callback, chain, circuit-breaker (#1060)

* Reduces checkstyle errors in callback

* Reduces checkstyle errors in chain

* Reduces checkstyle errors in circuit-breaker

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

@@ -24,23 +24,21 @@
 package com.iluwatar.chain;
 
 /**
- * 
  * The Chain of Responsibility pattern is a design pattern consisting of command objects and a
  * series of processing objects. Each processing object contains logic that defines the types of
  * command objects that it can handle; the rest are passed to the next processing object in the
  * chain. A mechanism also exists for adding new processing objects to the end of this chain.
- * <p>
- * In this example we organize the request handlers ({@link RequestHandler}) into a chain where each
- * handler has a chance to act on the request on its turn. Here the king ({@link OrcKing}) makes
- * requests and the military orcs ({@link OrcCommander}, {@link OrcOfficer}, {@link OrcSoldier})
- * form the handler chain.
- * 
+ *
+ * <p>In this example we organize the request handlers ({@link RequestHandler}) into a chain where
+ * each handler has a chance to act on the request on its turn. Here the king ({@link OrcKing})
+ * makes requests and the military orcs ({@link OrcCommander}, {@link OrcOfficer}, {@link
+ * OrcSoldier}) form the handler chain.
  */
 public class App {
 
   /**
-   * Program entry point
-   * 
+   * Program entry point.
+   *
    * @param args command line args
    */
   public static void main(String[] args) {

chain/src/main/java/com/iluwatar/chain/OrcCommander.java

@@ -24,9 +24,7 @@
 package com.iluwatar.chain;
 
 /**
- * 
- * OrcCommander
- *
+ * OrcCommander.
  */
 public class OrcCommander extends RequestHandler {
 

chain/src/main/java/com/iluwatar/chain/OrcKing.java

@@ -24,9 +24,7 @@
 package com.iluwatar.chain;
 
 /**
- * 
  * OrcKing makes requests that are handled by the chain.
- * 
  */
 public class OrcKing {
 

chain/src/main/java/com/iluwatar/chain/OrcOfficer.java

@@ -24,9 +24,7 @@
 package com.iluwatar.chain;
 
 /**
- * 
- * OrcOfficer
- *
+ * OrcOfficer.
  */
 public class OrcOfficer extends RequestHandler {
 

chain/src/main/java/com/iluwatar/chain/OrcSoldier.java

@@ -24,9 +24,7 @@
 package com.iluwatar.chain;
 
 /**
- * 
- * OrcSoldier
- *
+ * OrcSoldier.
  */
 public class OrcSoldier extends RequestHandler {
 

chain/src/main/java/com/iluwatar/chain/Request.java

@@ -26,24 +26,24 @@ package com.iluwatar.chain;
 import java.util.Objects;
 
 /**
- * Request
+ * Request.
  */
 public class Request {
 
   /**
    * The type of this request, used by each item in the chain to see if they should or can handle
-   * this particular request
+   * this particular request.
    */
   private final RequestType requestType;
 
   /**
-   * A description of the request
+   * A description of the request.
    */
   private final String requestDescription;
 
   /**
    * Indicates if the request is handled or not. A request can only switch state from unhandled to
-   * handled, there's no way to 'unhandle' a request
+   * handled, there's no way to 'unhandle' a request.
    */
   private boolean handled;
 
@@ -59,7 +59,7 @@ public class Request {
   }
 
   /**
-   * Get a description of the request
+   * Get a description of the request.
    *
    * @return A human readable description of the request
    */
@@ -69,7 +69,7 @@ public class Request {
 
   /**
    * Get the type of this request, used by each person in the chain of command to see if they should
-   * or can handle this particular request
+   * or can handle this particular request.
    *
    * @return The request type
    */
@@ -78,14 +78,14 @@ public class Request {
   }
 
   /**
-   * Mark the request as handled
+   * Mark the request as handled.
    */
   public void markHandled() {
     this.handled = true;
   }
 
   /**
-   * Indicates if this request is handled or not
+   * Indicates if this request is handled or not.
    *
    * @return <tt>true</tt> when the request is handled, <tt>false</tt> if not
    */

chain/src/main/java/com/iluwatar/chain/RequestHandler.java

@@ -27,9 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * 
- * RequestHandler
- *
+ * RequestHandler.
  */
 public abstract class RequestHandler {
 
@@ -42,7 +40,7 @@ public abstract class RequestHandler {
   }
 
   /**
-   * Request handler
+   * Request handler.
    */
   public void handleRequest(Request req) {
     if (next != null) {

chain/src/main/java/com/iluwatar/chain/RequestType.java

@@ -24,9 +24,7 @@
 package com.iluwatar.chain;
 
 /**
- * 
- * RequestType enumeration
- *
+ * RequestType enumeration.
  */
 public enum RequestType {