Adjust checkstyle rules. Make checkstyle fail the build when violations are found. Correct all current checkstyle violations.

poison-pill/src/main/java/com/iluwatar/poison/pill/Consumer.java

@@ -7,14 +7,17 @@ import com.iluwatar.poison.pill.Message.Headers;
  */
 public class Consumer {
 
-  private final MQSubscribePoint queue;
+  private final MqSubscribePoint queue;
   private final String name;
 
-  public Consumer(String name, MQSubscribePoint queue) {
+  public Consumer(String name, MqSubscribePoint queue) {
     this.name = name;
     this.queue = queue;
   }
 
+  /**
+   * Consume message
+   */
   public void consume() {
     while (true) {
       Message msg;

poison-pill/src/main/java/com/iluwatar/poison/pill/MessageQueue.java

@@ -3,6 +3,6 @@ package com.iluwatar.poison.pill;
 /**
  * Represents abstraction of channel (or pipe) that bounds {@link Producer} and {@link Consumer}
  */
-public interface MessageQueue extends MQPublishPoint, MQSubscribePoint {
+public interface MessageQueue extends MqPublishPoint, MqSubscribePoint {
 
 }

poison-pill/src/main/java/com/iluwatar/poison/pill/MqPublishPoint.java

@@ -3,7 +3,7 @@ package com.iluwatar.poison.pill;
 /**
  * Endpoint to publish {@link Message} to queue
  */
-public interface MQPublishPoint {
+public interface MqPublishPoint {
 
   public void put(Message msg) throws InterruptedException;
 }

poison-pill/src/main/java/com/iluwatar/poison/pill/MqSubscribePoint.java

@@ -3,7 +3,7 @@ package com.iluwatar.poison.pill;
 /**
  * Endpoint to retrieve {@link Message} from queue
  */
-public interface MQSubscribePoint {
+public interface MqSubscribePoint {
 
   public Message take() throws InterruptedException;
 }

poison-pill/src/main/java/com/iluwatar/poison/pill/Producer.java

@@ -10,16 +10,22 @@ import com.iluwatar.poison.pill.Message.Headers;
  */
 public class Producer {
 
-  private final MQPublishPoint queue;
+  private final MqPublishPoint queue;
   private final String name;
   private boolean isStopped;
 
-  public Producer(String name, MQPublishPoint queue) {
+  /**
+   * Constructor
+   */
+  public Producer(String name, MqPublishPoint queue) {
     this.name = name;
     this.queue = queue;
     this.isStopped = false;
   }
 
+  /**
+   * Send message to queue
+   */
   public void send(String body) {
     if (isStopped) {
       throw new IllegalStateException(String.format(
@@ -38,6 +44,9 @@ public class Producer {
     }
   }
 
+  /**
+   * Stop system by sending poison pill
+   */
   public void stop() {
     isStopped = true;
     try {