library/src/test/java/org/apache/apex/malhar/lib/codec/KryoStreamCodecTest.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.apex.malhar.lib.codec;

import java.io.IOException;

import org.junit.Assert;
import org.junit.Test;

import com.google.common.base.Preconditions;

import com.datatorrent.netlet.util.Slice;

/**
 * Tests for {@link KryoSerializableStreamCodec}
 *
 */
public class KryoStreamCodecTest
{

  public static class TestTuple
  {
    final Integer field;

    @SuppressWarnings("unused")
    private TestTuple()
    {
      this.field = 0;
    }

    public TestTuple(Integer x)
    {
      this.field = Preconditions.checkNotNull(x, "x");
    }

    @Override
    public boolean equals(Object o)
    {
      return o.getClass() == this.getClass() && ((TestTuple)o).field.equals(this.field);
    }

    @Override
    public int hashCode()
    {
      return TestTuple.class.hashCode() ^ this.field.hashCode();
    }
  }

  public static class TestKryoStreamCodec extends KryoSerializableStreamCodec<TestTuple>
  {

    public TestKryoStreamCodec()
    {
      super();
    }

    @Override
    public int getPartition(TestTuple testTuple)
    {
      return testTuple.field;
    }
  }

  @Test
  public void testSomeMethod() throws IOException
  {
    TestKryoStreamCodec coder = new TestKryoStreamCodec();
    TestKryoStreamCodec decoder = new TestKryoStreamCodec();

    KryoSerializableStreamCodec<Object> objCoder = new KryoSerializableStreamCodec<Object>();
    Slice sliceOfObj = objCoder.toByteArray(10);
    Integer decodedObj = (Integer)objCoder.fromByteArray(sliceOfObj);

    Assert.assertEquals("codec", decodedObj.intValue(), 10);

    TestTuple tp = new TestTuple(5);

    Slice dsp1 = coder.toByteArray(tp);
    Slice dsp2 = coder.toByteArray(tp);
    Assert.assertEquals(dsp1, dsp2);

    Object tcObject1 = decoder.fromByteArray(dsp1);
    assert (tp.equals(tcObject1));

    Object tcObject2 = decoder.fromByteArray(dsp2);
    assert (tp.equals(tcObject2));

    dsp1 = coder.toByteArray(tp);
    dsp2 = coder.toByteArray(tp);
    Assert.assertEquals(dsp1, dsp2);
  }

  @Test
  public void testFinalFieldSerialization() throws Exception
  {
    TestTuple t1 = new TestTuple(5);
    TestKryoStreamCodec codec = new TestKryoStreamCodec();

    Slice dsp = codec.toByteArray(t1);
    TestTuple t2 = (TestTuple)codec.fromByteArray(dsp);
    Assert.assertEquals("", t1.field, t2.field);
  }
}