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.Assert.assertEquals;
021
022import java.io.ByteArrayOutputStream;
023import java.io.DataInputStream;
024import java.io.DataOutputStream;
025import java.nio.ByteBuffer;
026import org.apache.hadoop.hbase.HBaseClassTestRule;
027import org.apache.hadoop.hbase.nio.MultiByteBuff;
028import org.apache.hadoop.hbase.testclassification.IOTests;
029import org.apache.hadoop.hbase.testclassification.SmallTests;
030import org.apache.hadoop.hbase.util.Bytes;
031import org.junit.ClassRule;
032import org.junit.Test;
033import org.junit.experimental.categories.Category;
034
035@Category({ IOTests.class, SmallTests.class })
036public class TestMultiByteBuffInputStream {
037
038  @ClassRule
039  public static final HBaseClassTestRule CLASS_RULE =
040    HBaseClassTestRule.forClass(TestMultiByteBuffInputStream.class);
041
042  @Test
043  public void testReads() throws Exception {
044    ByteArrayOutputStream bos = new ByteArrayOutputStream(100);
045    DataOutputStream dos = new DataOutputStream(bos);
046    String s = "test";
047    int i = 128;
048    dos.write(1);
049    dos.writeInt(i);
050    dos.writeBytes(s);
051    dos.writeLong(12345L);
052    dos.writeShort(2);
053    dos.flush();
054    ByteBuffer bb = ByteBuffer.wrap(bos.toByteArray());
055
056    // bbis contains 19 bytes
057    // 1 byte, 4 bytes int, 4 bytes string, 8 bytes long and 2 bytes short
058    ByteBuffInputStream bbis = new ByteBuffInputStream(new MultiByteBuff(bb));
059    assertEquals(15 + s.length(), bbis.available());
060    assertEquals(1, bbis.read());
061    byte[] ib = new byte[4];
062    bbis.read(ib);
063    assertEquals(i, Bytes.toInt(ib));
064    byte[] sb = new byte[s.length()];
065    bbis.read(sb);
066    assertEquals(s, Bytes.toString(sb));
067    byte[] lb = new byte[8];
068    bbis.read(lb);
069    assertEquals(12345, Bytes.toLong(lb));
070    assertEquals(2, bbis.available());
071    ib = new byte[4];
072    int read = bbis.read(ib, 0, ib.length);
073    // We dont have 4 bytes remainig but only 2. So onlt those should be returned back
074    assertEquals(2, read);
075    assertEquals(2, Bytes.toShort(ib));
076    assertEquals(0, bbis.available());
077    // At end. The read() should return -1
078    assertEquals(-1, bbis.read());
079    bbis.close();
080
081    bb = ByteBuffer.wrap(bos.toByteArray());
082    bbis = new ByteBuffInputStream(new MultiByteBuff(bb));
083    DataInputStream dis = new DataInputStream(bbis);
084    dis.read();
085    assertEquals(i, dis.readInt());
086    dis.close();
087  }
088}