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.util;
019
020import static org.junit.Assert.assertEquals;
021import static org.junit.Assert.assertFalse;
022import static org.junit.Assert.assertTrue;
023
024import java.io.IOException;
025import java.nio.ByteBuffer;
026import org.apache.hadoop.hbase.HBaseClassTestRule;
027import org.apache.hadoop.hbase.nio.ByteBuff;
028import org.apache.hadoop.hbase.testclassification.MiscTests;
029import org.apache.hadoop.hbase.testclassification.SmallTests;
030import org.junit.ClassRule;
031import org.junit.Test;
032import org.junit.experimental.categories.Category;
033
034@Category({MiscTests.class, SmallTests.class})
035public class TestByteBufferArray {
036
037  @ClassRule
038  public static final HBaseClassTestRule CLASS_RULE =
039      HBaseClassTestRule.forClass(TestByteBufferArray.class);
040
041  @Test
042  public void testAsSubBufferWhenEndOffsetLandInLastBuffer() throws Exception {
043    int capacity = 4 * 1024 * 1024;
044    ByteBufferAllocator allocator = new ByteBufferAllocator() {
045      @Override
046      public ByteBuffer allocate(long size) throws IOException {
047        return ByteBuffer.allocateDirect((int) size);
048      }
049    };
050    ByteBufferArray array = new ByteBufferArray(capacity, allocator);
051    ByteBuff subBuf = array.asSubByteBuff(0, capacity);
052    subBuf.position(capacity - 1);// Position to the last byte
053    assertTrue(subBuf.hasRemaining());
054    // Read last byte
055    subBuf.get();
056    assertFalse(subBuf.hasRemaining());
057  }
058
059  @Test
060  public void testByteBufferCreation() throws Exception {
061    int capacity = 470 * 1021 * 1023;
062    ByteBufferAllocator allocator = new ByteBufferAllocator() {
063      @Override
064      public ByteBuffer allocate(long size) throws IOException {
065        return ByteBuffer.allocateDirect((int) size);
066      }
067    };
068    ByteBufferArray array = new ByteBufferArray(capacity, allocator);
069    assertEquals(119, array.buffers.length);
070    for (int i = 0; i < array.buffers.length; i++) {
071      if (i == array.buffers.length - 1) {
072        assertEquals(0, array.buffers[i].capacity());
073      } else {
074        assertEquals(ByteBufferArray.DEFAULT_BUFFER_SIZE, array.buffers[i].capacity());
075      }
076    }
077  }
078
079  @Test
080  public void testByteBufferCreation1() throws Exception {
081    ByteBufferAllocator allocator = new ByteBufferAllocator() {
082      @Override
083      public ByteBuffer allocate(long size) throws IOException {
084        return ByteBuffer.allocateDirect((int) size);
085      }
086    };
087    ByteBufferArray array = new DummyByteBufferArray(7 * 1024 * 1024, allocator);
088    // overwrite
089    array.bufferCount = 25;
090    array.buffers = new ByteBuffer[array.bufferCount + 1];
091    array.createBuffers(allocator);
092    for (int i = 0; i < array.buffers.length; i++) {
093      if (i == array.buffers.length - 1) {
094        assertEquals(0, array.buffers[i].capacity());
095      } else {
096        assertEquals(458752, array.buffers[i].capacity());
097      }
098    }
099  }
100
101  private static class DummyByteBufferArray extends ByteBufferArray {
102
103    public DummyByteBufferArray(long capacity, ByteBufferAllocator allocator) throws IOException {
104      super(capacity, allocator);
105    }
106
107    @Override
108    int getThreadCount() {
109      return 16;
110    }
111  }
112}