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 @Override 062 protected void initializeStreams() throws IOException { 063 channel = socket.getChannel(); 064 channel.configureBlocking(false); 065 066 // listen for events telling us when the socket is readable. 067 selection = SelectorManager.getInstance().register(channel, new SelectorManager.Listener() { 068 @Override 069 public void onSelect(SelectorSelection selection) { 070 serviceRead(); 071 } 072 073 @Override 074 public void onError(SelectorSelection selection, Throwable error) { 075 if (error instanceof IOException) { 076 onException((IOException)error); 077 } else { 078 onException(IOExceptionSupport.create(error)); 079 } 080 } 081 }); 082 083 // Send the data via the channel 084 // inputBuffer = ByteBuffer.allocateDirect(8*1024); 085 inputBuffer = ByteBuffer.allocateDirect(getIoBufferSize()); 086 currentBuffer = inputBuffer; 087 nextFrameSize = -1; 088 currentBuffer.limit(4); 089 NIOOutputStream outPutStream = new NIOOutputStream(channel, getIoBufferSize()); 090 this.dataOut = new DataOutputStream(outPutStream); 091 this.buffOut = outPutStream; 092 } 093 094 protected void serviceRead() { 095 try { 096 while (true) { 097 098 int readSize = channel.read(currentBuffer); 099 if (readSize == -1) { 100 onException(new EOFException()); 101 selection.close(); 102 break; 103 } 104 if (readSize == 0) { 105 break; 106 } 107 108 this.receiveCounter += readSize; 109 if (currentBuffer.hasRemaining()) { 110 continue; 111 } 112 113 // Are we trying to figure out the size of the next frame? 114 if (nextFrameSize == -1) { 115 assert inputBuffer == currentBuffer; 116 117 // If the frame is too big to fit in our direct byte buffer, 118 // Then allocate a non direct byte buffer of the right size 119 // for it. 120 inputBuffer.flip(); 121 nextFrameSize = inputBuffer.getInt() + 4; 122 123 if (wireFormat instanceof OpenWireFormat) { 124 long maxFrameSize = ((OpenWireFormat)wireFormat).getMaxFrameSize(); 125 if (nextFrameSize > maxFrameSize) { 126 throw new IOException("Frame size of " + (nextFrameSize / (1024 * 1024)) + " MB larger than max allowed " + (maxFrameSize / (1024 * 1024)) + " MB"); 127 } 128 } 129 130 if (nextFrameSize > inputBuffer.capacity()) { 131 currentBuffer = ByteBuffer.allocateDirect(nextFrameSize); 132 currentBuffer.putInt(nextFrameSize); 133 } else { 134 inputBuffer.limit(nextFrameSize); 135 } 136 137 } else { 138 currentBuffer.flip(); 139 140 Object command = wireFormat.unmarshal(new DataInputStream(new NIOInputStream(currentBuffer))); 141 doConsume(command); 142 143 nextFrameSize = -1; 144 inputBuffer.clear(); 145 inputBuffer.limit(4); 146 currentBuffer = inputBuffer; 147 } 148 149 } 150 151 } catch (IOException e) { 152 onException(e); 153 } catch (Throwable e) { 154 onException(IOExceptionSupport.create(e)); 155 } 156 } 157 158 @Override 159 protected void doStart() throws Exception { 160 connect(); 161 selection.setInterestOps(SelectionKey.OP_READ); 162 selection.enable(); 163 } 164 165 @Override 166 protected void doStop(ServiceStopper stopper) throws Exception { 167 if (selection != null) { 168 selection.close(); 169 selection = null; 170 } 171 super.doStop(stopper); 172 } 173}