001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.activemq.transport.nio; 018 019import java.io.DataInputStream; 020import java.io.DataOutputStream; 021import java.io.EOFException; 022import java.io.IOException; 023import java.net.Socket; 024import java.net.URI; 025import java.net.UnknownHostException; 026import java.nio.ByteBuffer; 027import java.nio.channels.SelectionKey; 028import java.nio.channels.SocketChannel; 029 030import javax.net.SocketFactory; 031 032import org.apache.activemq.openwire.OpenWireFormat; 033import org.apache.activemq.transport.Transport; 034import org.apache.activemq.transport.tcp.TcpTransport; 035import org.apache.activemq.util.IOExceptionSupport; 036import org.apache.activemq.util.ServiceStopper; 037import org.apache.activemq.wireformat.WireFormat; 038 039/** 040 * An implementation of the {@link Transport} interface using raw tcp/ip 041 * 042 * 043 */ 044public class NIOTransport extends TcpTransport { 045 046 // private static final Logger log = LoggerFactory.getLogger(NIOTransport.class); 047 protected SocketChannel channel; 048 protected SelectorSelection selection; 049 protected ByteBuffer inputBuffer; 050 protected ByteBuffer currentBuffer; 051 protected int nextFrameSize; 052 053 public NIOTransport(WireFormat wireFormat, SocketFactory socketFactory, URI remoteLocation, URI localLocation) throws UnknownHostException, IOException { 054 super(wireFormat, socketFactory, remoteLocation, localLocation); 055 } 056 057 public NIOTransport(WireFormat wireFormat, Socket socket) throws IOException { 058 super(wireFormat, socket); 059 } 060 061 /** 062 * @param format 063 * @param socket 064 * @param initBuffer 065 * @throws IOException 066 */ 067 public NIOTransport(WireFormat format, Socket socket, InitBuffer initBuffer) throws IOException { 068 super(format, socket, initBuffer); 069 } 070 071 @Override 072 protected void initializeStreams() throws IOException { 073 channel = socket.getChannel(); 074 channel.configureBlocking(false); 075 076 // listen for events telling us when the socket is readable. 077 selection = SelectorManager.getInstance().register(channel, new SelectorManager.Listener() { 078 @Override 079 public void onSelect(SelectorSelection selection) { 080 serviceRead(); 081 } 082 083 @Override 084 public void onError(SelectorSelection selection, Throwable error) { 085 if (error instanceof IOException) { 086 onException((IOException)error); 087 } else { 088 onException(IOExceptionSupport.create(error)); 089 } 090 } 091 }); 092 093 // Send the data via the channel 094 // inputBuffer = ByteBuffer.allocateDirect(8*1024); 095 inputBuffer = ByteBuffer.allocateDirect(getIoBufferSize()); 096 currentBuffer = inputBuffer; 097 nextFrameSize = -1; 098 currentBuffer.limit(4); 099 NIOOutputStream outPutStream = new NIOOutputStream(channel, getIoBufferSize()); 100 this.dataOut = new DataOutputStream(outPutStream); 101 this.buffOut = outPutStream; 102 } 103 104 protected int readFromBuffer() throws IOException { 105 return channel.read(currentBuffer); 106 } 107 108 protected void serviceRead() { 109 try { 110 while (true) { 111 112 int readSize = readFromBuffer(); 113 if (readSize == -1) { 114 onException(new EOFException()); 115 selection.close(); 116 break; 117 } 118 if (readSize == 0) { 119 break; 120 } 121 122 this.receiveCounter += readSize; 123 if (currentBuffer.hasRemaining()) { 124 continue; 125 } 126 127 // Are we trying to figure out the size of the next frame? 128 if (nextFrameSize == -1) { 129 assert inputBuffer == currentBuffer; 130 131 // If the frame is too big to fit in our direct byte buffer, 132 // Then allocate a non direct byte buffer of the right size 133 // for it. 134 inputBuffer.flip(); 135 nextFrameSize = inputBuffer.getInt() + 4; 136 137 if (wireFormat instanceof OpenWireFormat) { 138 long maxFrameSize = ((OpenWireFormat)wireFormat).getMaxFrameSize(); 139 if (nextFrameSize > maxFrameSize) { 140 throw new IOException("Frame size of " + (nextFrameSize / (1024 * 1024)) + " MB larger than max allowed " + (maxFrameSize / (1024 * 1024)) + " MB"); 141 } 142 } 143 144 if (nextFrameSize > inputBuffer.capacity()) { 145 currentBuffer = ByteBuffer.allocateDirect(nextFrameSize); 146 currentBuffer.putInt(nextFrameSize); 147 } else { 148 inputBuffer.limit(nextFrameSize); 149 } 150 151 } else { 152 currentBuffer.flip(); 153 154 Object command = wireFormat.unmarshal(new DataInputStream(new NIOInputStream(currentBuffer))); 155 doConsume(command); 156 157 nextFrameSize = -1; 158 inputBuffer.clear(); 159 inputBuffer.limit(4); 160 currentBuffer = inputBuffer; 161 } 162 163 } 164 165 } catch (IOException e) { 166 onException(e); 167 } catch (Throwable e) { 168 onException(IOExceptionSupport.create(e)); 169 } 170 } 171 172 @Override 173 protected void doStart() throws Exception { 174 connect(); 175 selection.setInterestOps(SelectionKey.OP_READ); 176 selection.enable(); 177 } 178 179 @Override 180 protected void doStop(ServiceStopper stopper) throws Exception { 181 if (selection != null) { 182 selection.close(); 183 selection = null; 184 } 185 super.doStop(stopper); 186 } 187}