content: /**
   * 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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.pc;
  
  import org.testng.annotations.Test;
  
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.LinkedBlockingQueue;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertTrue;
  
  public class WorkItemConsumerWithResultsTest {
      @Test
      public void runningConsumerWillPopulateResults() {
          CountDownLatch              countDownLatch = new CountDownLatch(1);
          BlockingQueue<Integer>      bc             = new LinkedBlockingQueue<>(5);
          LinkedBlockingQueue<Object> results        = new LinkedBlockingQueue<>();
  
          IntegerConsumerSpy ic = new IntegerConsumerSpy(bc);
          ic.setResults(results);
          ic.setCountDownLatch(countDownLatch);
          ic.run();
  
          assertTrue(bc.isEmpty());
          assertEquals(results.size(), bc.size());
          assertEquals(countDownLatch.getCount(), 0);
      }
  
      @Test
      public void errorInConsumerWillDecrementCountdownLatch() {
          CountDownLatch              countDownLatch = new CountDownLatch(1);
          BlockingQueue<Integer>      bc             = new LinkedBlockingQueue<>(5);
          LinkedBlockingQueue<Object> results        = new LinkedBlockingQueue<>();
  
          IntegerConsumerThrowingError ic = new IntegerConsumerThrowingError(bc);
          ic.setCountDownLatch(countDownLatch);
          ic.setResults(results);
          ic.run();
  
          assertTrue(bc.isEmpty());
          assertTrue(results.isEmpty());
          assertEquals(countDownLatch.getCount(), 0);
      }
  
      private class IntegerConsumerSpy extends WorkItemConsumer<Integer> {
          int payload = -1;
  
          public IntegerConsumerSpy(BlockingQueue<Integer> queue) {
              super(queue);
          }
  
          @Override
          protected void commitDirty() {
              super.commitDirty();
          }
  
          @Override
          protected void doCommit() {
              addResult(payload);
          }
  
          @Override
          protected void processItem(Integer item) {
              payload = item.intValue();
          }
      }
  
      private class IntegerConsumerThrowingError extends WorkItemConsumer<Integer> {
          int payload = -1;
  
          public IntegerConsumerThrowingError(BlockingQueue<Integer> queue) {
              super(queue);
          }
  
          @Override
          protected void commitDirty() {
              super.commitDirty();
          }
  
          @Override
          protected void doCommit() {
              throw new NullPointerException();
          }
  
          @Override
          protected void processItem(Integer item) {
              payload = item.intValue();
          }
      }
  }
  