samoa-threads/src/test/java/org/apache/samoa/topology/impl/ThreadsStreamTest.java

/*
 * #%L
 * SAMOA
 * %%
 * Copyright (C) 2014 - 2015 Apache Software Foundation
 * %%
 * Licensed 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.
 * #L%
 */
package org.apache.samoa.topology.impl;

import static org.junit.Assert.*;

import java.util.Arrays;
import java.util.Collection;

import mockit.Expectations;
import mockit.Mocked;
import mockit.NonStrictExpectations;
import mockit.Tested;

import org.apache.samoa.core.ContentEvent;
import org.apache.samoa.topology.impl.ThreadsProcessingItem;
import org.apache.samoa.topology.impl.ThreadsStream;
import org.apache.samoa.utils.PartitioningScheme;
import org.apache.samoa.utils.StreamDestination;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

/**
 * @author Anh Thu Vu
 * 
 */
@RunWith(Parameterized.class)
public class ThreadsStreamTest {

  @Tested
  private ThreadsStream stream;

  @Mocked
  private ThreadsProcessingItem sourcePi, destPi;
  @Mocked
  private ContentEvent event;
  @Mocked
  private StreamDestination destination;

  private final String eventKey = "eventkey";
  private final int parallelism;
  private final PartitioningScheme scheme;

  @Parameters
  public static Collection<Object[]> generateParameters() {
    return Arrays.asList(new Object[][] {
        { 2, PartitioningScheme.SHUFFLE },
        { 3, PartitioningScheme.GROUP_BY_KEY },
        { 4, PartitioningScheme.BROADCAST }
    });
  }

  public ThreadsStreamTest(int parallelism, PartitioningScheme scheme) {
    this.parallelism = parallelism;
    this.scheme = scheme;
  }

  @Before
  public void setUp() throws Exception {
    stream = new ThreadsStream(sourcePi);
    stream.addDestination(destination);
  }

  @Test
  public void testAddDestination() {
    boolean found = false;
    for (StreamDestination sd : stream.getDestinations()) {
      if (sd == destination) {
        found = true;
        break;
      }
    }
    assertTrue("Destination object was not added in stream's destinations set.", found);
  }

  @Test
  public void testPut() {
    new NonStrictExpectations() {
      {
        event.getKey();
        result = eventKey;
        destination.getProcessingItem();
        result = destPi;
        destination.getPartitioningScheme();
        result = scheme;
        destination.getParallelism();
        result = parallelism;

      }
    };
    switch (this.scheme) {
    case SHUFFLE:
    case GROUP_BY_KEY:
      new Expectations() {
        {

          // TODO: restrict the range of counter value
          destPi.processEvent(event, anyInt);
          times = 1;
        }
      };
      break;
    case BROADCAST:
      new Expectations() {
        {
          // TODO: restrict the range of counter value
          destPi.processEvent(event, anyInt);
          times = parallelism;
        }
      };
      break;
    }
    stream.put(event);
  }

}