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* 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.cassandra.io.util;
import java.io.EOFException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.util.concurrent.ThreadLocalRandom;
import org.junit.Test;
import junit.framework.Assert;
import org.apache.cassandra.utils.memory.MemoryUtil;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class MemoryTest
{
@Test
public void testByteBuffers()
{
byte[] bytes = new byte[1000];
ThreadLocalRandom.current().nextBytes(bytes);
final Memory memory = Memory.allocate(bytes.length);
memory.setBytes(0, bytes, 0, bytes.length);
ByteBuffer canon = ByteBuffer.wrap(bytes).order(ByteOrder.nativeOrder());
test(canon, memory);
memory.setBytes(0, new byte[1000], 0, 1000);
memory.setBytes(0, canon.duplicate());
test(canon, memory);
memory.close();
}
@Test
public void testInputStream() throws IOException
{
byte[] bytes = new byte[4096];
ThreadLocalRandom.current().nextBytes(bytes);
final Memory memory = Memory.allocate(bytes.length);
memory.setBytes(0, bytes, 0, bytes.length);
try(MemoryInputStream stream = new MemoryInputStream(memory, 1024))
{
byte[] bb = new byte[bytes.length];
assertEquals(bytes.length, stream.available());
stream.readFully(bb);
assertEquals(0, stream.available());
assertTrue(Arrays.equals(bytes, bb));
try
{
stream.readInt();
fail("Expected EOF exception");
}
catch (EOFException e)
{
//pass
}
}
}
private static void test(ByteBuffer canon, Memory memory)
{
ByteBuffer hollow = MemoryUtil.getHollowDirectByteBuffer();
test(canon, hollow, memory, 0, 1000);
test(canon, hollow, memory, 33, 100);
test(canon, hollow, memory, 77, 77);
test(canon, hollow, memory, 903, 96);
}
private static void test(ByteBuffer canon, ByteBuffer hollow, Memory memory, int offset, int length)
{
canon = canon.duplicate();
canon.position(offset).limit(offset + length);
canon = canon.slice().order(ByteOrder.nativeOrder());
test(canon, memory.asByteBuffer(offset, length));
memory.setByteBuffer(hollow, offset, length);
test(canon, hollow);
}
private static void test(ByteBuffer canon, ByteBuffer test)
{
Assert.assertEquals(canon, test);
for (int i = 0 ; i <= canon.limit() - 4 ; i += 4)
Assert.assertEquals(canon.getInt(i), test.getInt(i));
for (int i = 0 ; i <= canon.limit() - 8 ; i += 8)
Assert.assertEquals(canon.getLong(i), test.getLong(i));
}
}