| /** |
| * 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.hadoop.hdfs.protocol.datatransfer; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| import org.apache.hadoop.hdfs.AppendTestUtil; |
| import org.junit.Test; |
| import org.mockito.Mockito; |
| |
| import static org.junit.Assert.*; |
| |
| public class TestPacketReceiver { |
| |
| private static long OFFSET_IN_BLOCK = 12345L; |
| private static int SEQNO = 54321; |
| |
| private byte[] prepareFakePacket(byte[] data, byte[] sums) throws IOException { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| DataOutputStream dos = new DataOutputStream(baos); |
| |
| int packetLen = data.length + sums.length + 4; |
| PacketHeader header = new PacketHeader( |
| packetLen, OFFSET_IN_BLOCK, SEQNO, false, data.length, false); |
| header.write(dos); |
| |
| dos.write(sums); |
| dos.write(data); |
| dos.flush(); |
| return baos.toByteArray(); |
| } |
| |
| private static byte[] remainingAsArray(ByteBuffer buf) { |
| byte[] b = new byte[buf.remaining()]; |
| buf.get(b); |
| return b; |
| } |
| |
| @Test |
| public void testReceiveAndMirror() throws IOException { |
| PacketReceiver pr = new PacketReceiver(false); |
| |
| // Test three different lengths, to force reallocing |
| // the buffer as it grows. |
| doTestReceiveAndMirror(pr, 100, 10); |
| doTestReceiveAndMirror(pr, 50, 10); |
| doTestReceiveAndMirror(pr, 150, 10); |
| |
| pr.close(); |
| } |
| |
| private void doTestReceiveAndMirror(PacketReceiver pr, |
| int dataLen, int checksumsLen) throws IOException { |
| final byte[] DATA = AppendTestUtil.initBuffer(dataLen); |
| final byte[] CHECKSUMS = AppendTestUtil.initBuffer(checksumsLen); |
| |
| byte[] packet = prepareFakePacket(DATA, CHECKSUMS); |
| ByteArrayInputStream in = new ByteArrayInputStream(packet); |
| |
| pr.receiveNextPacket(in); |
| |
| ByteBuffer parsedData = pr.getDataSlice(); |
| assertArrayEquals(DATA, remainingAsArray(parsedData)); |
| |
| ByteBuffer parsedChecksums = pr.getChecksumSlice(); |
| assertArrayEquals(CHECKSUMS, remainingAsArray(parsedChecksums)); |
| |
| PacketHeader header = pr.getHeader(); |
| assertEquals(SEQNO, header.getSeqno()); |
| assertEquals(OFFSET_IN_BLOCK, header.getOffsetInBlock()); |
| |
| // Mirror the packet to an output stream and make sure it matches |
| // the packet we sent. |
| ByteArrayOutputStream mirrored = new ByteArrayOutputStream(); |
| mirrored = Mockito.spy(mirrored); |
| |
| pr.mirrorPacketTo(new DataOutputStream(mirrored)); |
| // The write should be done in a single call. Otherwise we may hit |
| // nasty interactions with nagling (eg HDFS-4049). |
| Mockito.verify(mirrored, Mockito.times(1)) |
| .write(Mockito.<byte[]>any(), Mockito.anyInt(), |
| Mockito.eq(packet.length)); |
| Mockito.verifyNoMoreInteractions(mirrored); |
| |
| assertArrayEquals(packet, mirrored.toByteArray()); |
| } |
| } |