Java 11 migrate remaining p (#1122)

* Moves partial-response to Java 11

* Moves pipeline to Java 11

* Moves poison-pill to Java 11

* Moves priority-queue to Java 11

* Moves private-class-data to Java 11

* Moves producer-consumer to Java 11

* Moves promise to Java 11

* Moves property to Java 11

* Moves prototype to Java 11

* Moves proxy to Java 11

* Corrects checkstyle errors

* Fixes build for pipeline pattern

producer-consumer/src/main/java/com/iluwatar/producer/consumer/App.java

@@ -26,20 +26,18 @@ package com.iluwatar.producer.consumer;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
  * Producer Consumer Design pattern is a classic concurrency or threading pattern which reduces
- * coupling between Producer and Consumer by separating Identification of work with
- * Execution of Work.
+ * coupling between Producer and Consumer by separating Identification of work with Execution of
+ * Work.
  *
  * <p>In producer consumer design pattern a shared queue is used to control the flow and this
- * separation allows you to code producer and consumer separately. It also addresses the issue
- * of different timing require to produce item or consuming item. by using producer consumer
- * pattern both Producer and Consumer Thread can work with different speed.
- * 
+ * separation allows you to code producer and consumer separately. It also addresses the issue of
+ * different timing require to produce item or consuming item. by using producer consumer pattern
+ * both Producer and Consumer Thread can work with different speed.
  */
 public class App {
 
@@ -47,18 +45,17 @@ public class App {
 
   /**
    * Program entry point.
-   * 
-   * @param args
-   *          command line args
+   *
+   * @param args command line args
    */
   public static void main(String[] args) {
 
-    ItemQueue queue = new ItemQueue();
+    var queue = new ItemQueue();
 
-    ExecutorService executorService = Executors.newFixedThreadPool(5);
-    for (int i = 0; i < 2; i++) {
+    var executorService = Executors.newFixedThreadPool(5);
+    for (var i = 0; i < 2; i++) {
 
-      final Producer producer = new Producer("Producer_" + i, queue);
+      final var producer = new Producer("Producer_" + i, queue);
       executorService.submit(() -> {
         while (true) {
           producer.produce();
@@ -66,8 +63,8 @@ public class App {
       });
     }
 
-    for (int i = 0; i < 3; i++) {
-      final Consumer consumer = new Consumer("Consumer_" + i, queue);
+    for (var i = 0; i < 3; i++) {
+      final var consumer = new Consumer("Consumer_" + i, queue);
       executorService.submit(() -> {
         while (true) {
           consumer.consume();

producer-consumer/src/main/java/com/iluwatar/producer/consumer/Consumer.java

@@ -46,10 +46,9 @@ public class Consumer {
    * Consume item from the queue.
    */
   public void consume() throws InterruptedException {
-
-    Item item = queue.take();
+    var item = queue.take();
     LOGGER.info("Consumer [{}] consume item [{}] produced by [{}]", name,
-            item.getId(), item.getProducer());
+        item.getId(), item.getProducer());
 
   }
 }

producer-consumer/src/main/java/com/iluwatar/producer/consumer/Producer.java

@@ -30,7 +30,7 @@ import java.util.Random;
  * to queue.
  */
 public class Producer {
-  
+
   private static final Random RANDOM = new Random();
 
   private final ItemQueue queue;
@@ -49,7 +49,7 @@ public class Producer {
    */
   public void produce() throws InterruptedException {
 
-    Item item = new Item(name, itemId++);
+    var item = new Item(name, itemId++);
     queue.put(item);
     Thread.sleep(RANDOM.nextInt(2000));
   }

producer-consumer/src/test/java/com/iluwatar/producer/consumer/AppTest.java

@@ -26,16 +26,13 @@ package com.iluwatar.producer.consumer;
 import org.junit.jupiter.api.Test;
 
 /**
- * 
  * Application test
- *
  */
 public class AppTest {
 
   @Test
-  public void test() throws Exception {
-    String[] args = {};
-    App.main(args);
+  public void test() {
+    App.main(new String[]{});
 
   }
 }

producer-consumer/src/test/java/com/iluwatar/producer/consumer/ConsumerTest.java

@@ -23,13 +23,13 @@
 
 package com.iluwatar.producer.consumer;
 
-import org.junit.jupiter.api.Test;
-
 import static org.mockito.Mockito.reset;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
+import org.junit.jupiter.api.Test;
+
 /**
  * Date: 12/27/15 - 11:01 PM
  *
@@ -41,15 +41,15 @@ public class ConsumerTest {
 
   @Test
   public void testConsume() throws Exception {
-    final ItemQueue queue = spy(new ItemQueue());
-    for (int id = 0; id < ITEM_COUNT; id++) {
+    final var queue = spy(new ItemQueue());
+    for (var id = 0; id < ITEM_COUNT; id++) {
       queue.put(new Item("producer", id));
     }
 
     reset(queue); // Don't count the preparation above as interactions with the queue
-    final Consumer consumer = new Consumer("consumer", queue);
+    final var consumer = new Consumer("consumer", queue);
 
-    for (int id = 0; id < ITEM_COUNT; id++) {
+    for (var id = 0; id < ITEM_COUNT; id++) {
       consumer.consume();
     }
 

producer-consumer/src/test/java/com/iluwatar/producer/consumer/ProducerTest.java

@@ -23,8 +23,6 @@
 
 package com.iluwatar.producer.consumer;
 
-import org.junit.jupiter.api.Test;
-
 import static java.time.Duration.ofMillis;
 import static org.junit.jupiter.api.Assertions.assertTimeout;
 import static org.mockito.Matchers.any;
@@ -32,6 +30,8 @@ import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 
+import org.junit.jupiter.api.Test;
+
 /**
  * Date: 12/28/15 - 12:12 AM
  *
@@ -42,8 +42,8 @@ public class ProducerTest {
   @Test
   public void testProduce() {
     assertTimeout(ofMillis(6000), () -> {
-      final ItemQueue queue = mock(ItemQueue.class);
-      final Producer producer = new Producer("producer", queue);
+      final var queue = mock(ItemQueue.class);
+      final var producer = new Producer("producer", queue);
 
       producer.produce();
       verify(queue).put(any(Item.class));