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.annotations.Test;
  
  import java.util.HashSet;
  import java.util.Set;
  import java.util.concurrent.BlockingQueue;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertTrue;
  
  public class WorkItemManagerWithResultsTest {
      private static final Logger LOG = LoggerFactory.getLogger(WorkItemManagerWithResultsTest.class);
  
      @Test
      public void drainTest() throws InterruptedException {
          final int                                           maxItems = 50;
          IntegerConsumerBuilder                              cb       = new IntegerConsumerBuilder();
          WorkItemManager<Integer, WorkItemConsumer<Integer>> wi       = getWorkItemManger(cb, 5);
  
          for (int i = 0; i < maxItems; i++) {
              wi.produce(i);
          }
  
          wi.drain();
  
          assertEquals(wi.getResults().size(), maxItems);
  
          Set<Object> set = new HashSet<>(wi.getResults());
  
          assertEquals(set.size(), maxItems);
  
          wi.shutdown();
      }
  
      @Test
      public void drainCheckProduceTest() throws InterruptedException {
          IntegerConsumerBuilder                              cb = new IntegerConsumerBuilder();
          WorkItemManager<Integer, WorkItemConsumer<Integer>> wi = getWorkItemManger(cb, 2);
  
          for (int i = 0; i < 5; i++) {
              repeatedDrainAndProduce(i, wi);
          }
  
          wi.shutdown();
      }
  
      private WorkItemManager<Integer, WorkItemConsumer<Integer>> getWorkItemManger(IntegerConsumerBuilder cb, int numWorkers) {
          return new WorkItemManager<>(cb, "IntegerConsumer", 5, numWorkers, true);
      }
  
      private void repeatedDrainAndProduce(int runCount, WorkItemManager<Integer, WorkItemConsumer<Integer>> wi) {
          final int maxItems = 100;
          int       halfWay  = maxItems / 2;
  
          LOG.info("Run: {}", runCount);
  
          wi.getResults().clear();
  
          for (int i = 0; i < maxItems; i++) {
              if (i == halfWay) {
                  wi.drain();
  
                  Set<Object> set = new HashSet<>(wi.getResults());
  
                  assertEquals(wi.getResults().size(), halfWay, "halfWay: total count");
  
                  assertEquals(set.size(), halfWay, "halfWay: set match");
              }
  
              wi.checkProduce(i);
          }
  
          wi.drain();
  
          assertEquals(wi.getResults().size(), maxItems, "total count");
  
          Set<Object> set = new HashSet<>(wi.getResults());
  
          assertEquals(set.size(), maxItems, "set count");
  
          for (int i = 100; i < 100 + maxItems; i++) {
              assertTrue(set.contains(i), "Could not test: " + i);
          }
      }
  
      private static class IntegerConsumer extends WorkItemConsumer<Integer> {
          private static final ThreadLocal<Integer> payload = new ThreadLocal<>();
  
          public IntegerConsumer(BlockingQueue<Integer> queue) {
              super(queue);
          }
  
          public int getPayload() {
              return payload.get();
          }
  
          public void setPayload(int v) {
              payload.set(v);
          }
  
          public void incrementPayload(int v) {
              payload.set(payload.get() + v);
          }
  
          @Override
          protected void doCommit() {
              if (getPayload() == -1) {
                  LOG.debug("Skipping:");
  
                  return;
              }
  
              incrementPayload(100);
              addResult(getPayload());
  
              setPayload(0);
          }
  
          @Override
          protected void processItem(Integer item) {
              try {
                  setPayload(item);
  
                  Thread.sleep(20 + RandomUtils.nextInt(5, 7));
  
                  super.commit();
              } catch (InterruptedException e) {
                  e.printStackTrace();
              }
          }
      }
  
      private static class IntegerConsumerBuilder implements WorkItemBuilder<WorkItemConsumer<Integer>, Integer> {
          @Override
          public IntegerConsumer build(BlockingQueue<Integer> queue) {
              return new IntegerConsumer(queue);
          }
      }
  }
  