001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.io;
019
020import static org.junit.jupiter.api.Assertions.assertTrue;
021
022import java.io.IOException;
023import java.nio.ByteBuffer;
024import org.apache.hadoop.hbase.testclassification.MiscTests;
025import org.apache.hadoop.hbase.testclassification.SmallTests;
026import org.apache.hadoop.hbase.util.Bytes;
027import org.junit.jupiter.api.Tag;
028import org.junit.jupiter.api.Test;
029
030@Tag(SmallTests.TAG)
031@Tag(MiscTests.TAG)
032public class TestByteBufferOutputStream {
033
034  @Test
035  public void testByteBufferReuse() throws IOException {
036    byte[] someBytes = Bytes.toBytes("some bytes");
037    ByteBuffer bb = ByteBuffer.allocate(someBytes.length);
038    ByteBuffer bbToReuse = write(bb, someBytes);
039    bbToReuse = write(bbToReuse, Bytes.toBytes("less"));
040    assertTrue(bb == bbToReuse);
041  }
042
043  private ByteBuffer write(final ByteBuffer bb, final byte[] bytes) throws IOException {
044    try (ByteBufferOutputStream bbos = new ByteBufferOutputStream(bb)) {
045      bbos.write(bytes);
046      assertTrue(Bytes.compareTo(bytes, bbos.toByteArray(0, bytes.length)) == 0);
047      bbos.flush();
048      return bbos.getByteBuffer();
049    }
050  }
051}