/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.maven.plugin.surefire.booterclient.output;
  
  import javax.annotation.Nonnull;
  
  import java.util.concurrent.Callable;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.FutureTask;
  
  import org.apache.maven.plugin.surefire.booterclient.output.ThreadedStreamConsumer.QueueSynchronizer;
  import org.apache.maven.surefire.api.event.Event;
  import org.apache.maven.surefire.api.event.StandardStreamOutWithNewLineEvent;
  import org.apache.maven.surefire.extensions.EventHandler;
  import org.junit.Test;
  
  import static java.util.concurrent.TimeUnit.SECONDS;
  import static org.apache.maven.surefire.api.report.RunMode.NORMAL_RUN;
  import static org.assertj.core.api.Assertions.assertThat;
  
  /**
   *
   */
  @SuppressWarnings("checkstyle:magicnumber")
  public class ThreadedStreamConsumerTest {
      @Test
      public void testQueueSynchronizer() throws Exception {
          final CountDownLatch countDown = new CountDownLatch(5_000_000);
          final QueueSynchronizer<Integer> sync = new QueueSynchronizer<>(8 * 1024, null);
  
          Thread t = new Thread() {
              @Override
              public void run() {
                  while (true) {
                      try {
                          sync.awaitNext();
                          countDown.countDown();
                      } catch (InterruptedException e) {
                          throw new IllegalStateException(e);
                      }
                  }
              }
          };
          t.setDaemon(true);
          t.start();
  
          SECONDS.sleep(1);
          System.gc();
          SECONDS.sleep(2);
  
          long t1 = System.currentTimeMillis();
  
          for (int i = 0; i < 5_000_000; i++) {
              sync.pushNext(i);
          }
  
          assertThat(countDown.await(3L, SECONDS)).isTrue();
  
          long t2 = System.currentTimeMillis();
          System.out.println((t2 - t1) + " millis in testQueueSynchronizer()");
      }
  
      @Test
      public void testThreadedStreamConsumer() throws Exception {
          final CountDownLatch countDown = new CountDownLatch(5_000_000);
          EventHandler<Event> handler = new EventHandler<Event>() {
              @Override
              public void handleEvent(@Nonnull Event event) {
                  countDown.countDown();
              }
          };
  
          ThreadedStreamConsumer streamConsumer = new ThreadedStreamConsumer(handler);
  
          SECONDS.sleep(1);
          System.gc();
          SECONDS.sleep(2);
  
          long t1 = System.currentTimeMillis();
  
          Event event = new StandardStreamOutWithNewLineEvent(NORMAL_RUN, 1L, "");
          for (int i = 0; i < 5_000_000; i++) {
              streamConsumer.handleEvent(event);
         }
 
         assertThat(countDown.await(3L, SECONDS)).isTrue();
 
         long t2 = System.currentTimeMillis();
         System.out.println((t2 - t1) + " millis in testThreadedStreamConsumer()");
 
         streamConsumer.close();
     }
 
     @Test
     public void testBasicStatus() throws Exception {
         final QueueSynchronizer<String> sync = new QueueSynchronizer<>(2, null);
         sync.pushNext("1");
         sync.pushNext("2");
         String s1 = sync.awaitNext();
         String s2 = sync.awaitNext();
         assertThat(s1).isEqualTo("1");
         assertThat(s2).isEqualTo("2");
         FutureTask<Void> future = new FutureTask<>(new Callable<Void>() {
             @Override
             public Void call() throws Exception {
                 sync.awaitNext();
                 return null;
             }
         });
         Thread t = new Thread(future);
         t.setDaemon(true);
         t.start();
         SECONDS.sleep(3L);
         assertThat(t.getState()).isEqualTo(Thread.State.WAITING);
     }
 }