gemfire-core/src/test/java/com/gemstone/gemfire/internal/HeapDataOutputStreamJUnitTest.java

/*=========================================================================
 * Copyright (c) 2011-2014 Pivotal Software, Inc. All Rights Reserved.
 * This product is protected by U.S. and international copyright
 * and intellectual property laws. Pivotal products are covered by
 * more patents listed at http://www.pivotal.io/patents.
 *=========================================================================
 */
package com.gemstone.gemfire.internal;

import java.io.DataInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Arrays;

import junit.framework.TestCase;

import org.junit.experimental.categories.Category;

import com.gemstone.gemfire.DataSerializer;
import com.gemstone.gemfire.internal.cache.UnitTestValueHolder;
import com.gemstone.gemfire.test.junit.categories.UnitTest;

/**
 * Test of methods on HeapDataOutputStream
 * 
 * TODO right now this just tests the new
 * write(ByteBuffer) method. We might want
 * to add some unit tests for the existing methods.
 *
 */
@Category(UnitTest.class)
public class HeapDataOutputStreamJUnitTest extends TestCase {
  
  public void testWriteByteBuffer() {
    HeapDataOutputStream out = new HeapDataOutputStream(64, Version.CURRENT);
    
    byte[] bytes = "1234567890qwertyuiopasdfghjklzxcvbnm,./;'".getBytes();
    out.write(ByteBuffer.wrap(bytes, 0, 2));
    out.write(ByteBuffer.wrap(bytes, 2, bytes.length - 2));
    
    ByteBuffer unused = out.finishWritingAndReturnUnusedBuffer();
    assertEquals(64 - bytes.length, unused.capacity());
    assertEquals(0, unused.position());
    assertEquals(unused.capacity(), unused.limit());

    byte[] actual = out.toByteArray();
    
    assertEquals(new String(bytes) , new String(actual));
  }
  

  public void testWriteByteBufferCopyUseBuffer() {
    ByteBuffer buf = ByteBuffer.allocate(32);
    HeapDataOutputStream out = new HeapDataOutputStream(buf, Version.CURRENT, true);
    
    out.write(0);
    
    byte[] bytes = new byte[]{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33};
    out.write(ByteBuffer.wrap(bytes));
    
    out.write(34);
    
    ByteBuffer unused = out.finishWritingAndReturnUnusedBuffer();
    assertEquals(buf.capacity()-3, unused.capacity());
    assertEquals(0, unused.position());
    assertEquals(unused.capacity(), unused.limit());
    
    int bbCount = out.getByteBufferCount();
    assertEquals(2, bbCount);
    ByteBuffer[] bbs = new ByteBuffer[bbCount];
    out.fillByteBufferArray(bbs, 0);


    byte[] bbsBytes = new byte[out.size()];
    ByteBuffer tmp = ByteBuffer.wrap(bbsBytes);
    for (int i = 0; i < bbCount; i++) {
      tmp.put(bbs[i]);
    }
    tmp.flip();
    byte[] expectedBytes = new byte[bytes.length+2];
    ByteBuffer expected = ByteBuffer.wrap(expectedBytes);
    expected.put((byte) 0);
    expected.put(bytes);
    expected.put((byte) 34);
    expected.flip();
    assertEquals(expected, tmp);
  }

  public void testWriteByteBufferNoCopyUseBuffer() {
    ByteBuffer buf = ByteBuffer.allocate(32);
    HeapDataOutputStream out = new HeapDataOutputStream(buf, Version.CURRENT, true);
    
    out.write(0);
    
    byte[] bytes = new byte[HeapDataOutputStream.MIN_TO_COPY+1];
    for (int i=0; i < bytes.length; i++) {
      bytes[i] = (byte)((i+1) % 128);
    }
    ByteBuffer bytesBB = ByteBuffer.wrap(bytes);
    out.write(bytesBB);
    
    out.write((byte)((bytes.length+1) % 128));
    
    ByteBuffer unused = out.finishWritingAndReturnUnusedBuffer();
    assertEquals(buf.capacity()-2, unused.capacity());
    assertEquals(0, unused.position());
    assertEquals(unused.capacity(), unused.limit());
    
    int bbCount = out.getByteBufferCount();
    assertEquals(3, bbCount);
    ByteBuffer[] bbs = new ByteBuffer[bbCount];
    out.fillByteBufferArray(bbs, 0);

    assertEquals(true, bbs[1] == bytesBB);

    byte[] bbsBytes = new byte[out.size()];
    ByteBuffer tmp = ByteBuffer.wrap(bbsBytes);
    for (int i = 0; i < bbCount; i++) {
      tmp.put(bbs[i]);
    }
    tmp.flip();
    byte[] expectedBytes = new byte[bytes.length+2];
    for (int i=0; i < expectedBytes.length; i++) {
      expectedBytes[i] = (byte)(i % 128);
    }
    ByteBuffer expected = ByteBuffer.wrap(expectedBytes);
    assertEquals(expected, tmp);
  }
  
  public void testWriteJavaSerializeNoCopy() throws IOException, ClassNotFoundException {
    byte[] bytes = new byte[2000];
    for (int i = 0; i < bytes.length; i++) {
      bytes[i] = (byte)i;
    }
    UnitTestValueHolder vh = new UnitTestValueHolder(bytes);
    ByteBuffer buf = ByteBuffer.allocate(32);
    HeapDataOutputStream out = new HeapDataOutputStream(buf, Version.CURRENT, true);
    DataSerializer.writeObject(vh, out);
    UnitTestValueHolder vh2 = DataSerializer.readObject(new DataInputStream(out.getInputStream()));
    if (!Arrays.equals(bytes, (byte[])vh2.getValue())) {
      fail("expected " + Arrays.toString(bytes) + " but found " + Arrays.toString((byte[])vh2.getValue()));
    }
  }

}