lang/java/reef-wake/wake/src/test/java/org/apache/reef/wake/test/IndependentIterationsThreadPoolStageTest.java

/*
 * 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.reef.wake.test;

import org.apache.reef.wake.EventHandler;
import org.apache.reef.wake.impl.IndependentIterationsThreadPoolStage;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

/**
 * IndependentIterationsThreadPoolStage test.
 */
public class IndependentIterationsThreadPoolStageTest {

  @Test
  public void testOneIteration() {
    final AtomicInteger x = new AtomicInteger(0);
    final int val = 101;
    final IndependentIterationsThreadPoolStage<Integer> dut = new IndependentIterationsThreadPoolStage<>(
        new EventHandler<Integer>() {
          @Override
          public void onNext(final Integer value) {
            x.addAndGet(value);
          }
        }, 1, 1);
    final List<Integer> ll = new ArrayList<>();
    ll.add(val);
    dut.onNext(ll);
    try {
      dut.close();
    } catch (final Exception e) {
      fail(e.toString());
    }
    assertEquals(val, x.get());
  }

  @Test
  public void testOneIterationPerThread() throws InterruptedException {
    final AtomicInteger x = new AtomicInteger(0);
    final int num = 100;
    final List<Integer> ll = new ArrayList<>();
    for (int i = 0; i < num; i++) {
      ll.add(i);
    }

    final IndependentIterationsThreadPoolStage<Integer> dut = new IndependentIterationsThreadPoolStage<>(
        new EventHandler<Integer>() {
          @Override
          public void onNext(final Integer value) {
            Logger.getAnonymousLogger().info("Yow" + value);
            x.addAndGet(value);
          }
        }, num, 1);

    dut.onNext(ll);

    try {
      dut.close();
    } catch (final Exception e) {
      fail(e.toString());
    }

    assertEquals((num - 1) * num / 2, x.get());
  }

}