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.apache.commons.lang3.RandomUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.testng.SkipException;
  import org.testng.annotations.Test;
  
  import java.util.concurrent.BlockingQueue;
  import java.util.concurrent.ConcurrentLinkedQueue;
  
  import static org.testng.Assert.assertEquals;
  
  public class WorkItemManagerTest {
      private static final Logger LOG = LoggerFactory.getLogger(WorkItemManagerTest.class);
  
      @Test
      public void oneWorkerSequences() {
          IntegerConsumerBuilder cb            = new IntegerConsumerBuilder();
          int                    numberOfItems = 10;
          try {
              WorkItemManager<Integer, WorkItemConsumer<Integer>> wi = getWorkItemManger(cb, 1);
              for (int i = 0; i < numberOfItems; i++) {
                  wi.produce(i);
              }
  
              wi.shutdown();
          } catch (InterruptedException e) {
              throw new SkipException("Test skipped!");
          }
  
          assertEquals(cb.integers.size(), numberOfItems);
          Integer[] ints = cb.integers.toArray(new Integer[] {});
          for (int i = 0; i < numberOfItems; i++) {
              assertEquals(ints[i], i, i);
          }
      }
  
      @Test
      public void multipleWorkersUnpredictableSequence() {
          IntegerConsumerBuilder cb            = new IntegerConsumerBuilder();
          int                    numberOfItems = 100;
          try {
              WorkItemManager<Integer, WorkItemConsumer<Integer>> wi = getWorkItemManger(cb, 5);
              for (int i = 0; i < numberOfItems; i++) {
                  wi.produce(i);
              }
  
              wi.shutdown();
          } catch (InterruptedException e) {
              throw new SkipException("Test skipped!");
          }
  
          assertEquals(cb.integers.size(), numberOfItems);
      }
  
      private WorkItemManager<Integer, WorkItemConsumer<Integer>> getWorkItemManger(IntegerConsumerBuilder cb, int numWorkers) {
          return new WorkItemManager<>(cb, 5, numWorkers);
      }
  
      private static class IntegerConsumer extends WorkItemConsumer<Integer> {
          private final ConcurrentLinkedQueue<Integer> target;
  
          public IntegerConsumer(BlockingQueue<Integer> queue, ConcurrentLinkedQueue<Integer> target) {
              super(queue);
  
              this.target = target;
          }
  
          @Override
          protected void doCommit() {
              try {
                  Thread.sleep(20L * RandomUtils.nextInt(10, 15));
              } catch (InterruptedException e) {
                  e.printStackTrace();
              }
          }
  
          @Override
          protected void processItem(Integer item) {
              LOG.info("adding: {}: size: {}", item, target.size());
              target.add(item);
          }
      }
  
      private static class IntegerConsumerBuilder implements WorkItemBuilder<WorkItemConsumer<Integer>, Integer> {
          ConcurrentLinkedQueue<Integer> integers = new ConcurrentLinkedQueue<>();
  
          @Override
          public IntegerConsumer build(BlockingQueue<Integer> queue) {
              return new IntegerConsumer(queue, integers);
          }
      }
  }
  