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.amqp; 018 019import java.io.DataOutputStream; 020import java.io.EOFException; 021import java.io.IOException; 022import java.net.Socket; 023import java.net.URI; 024import java.net.UnknownHostException; 025import java.nio.ByteBuffer; 026import java.nio.channels.SelectionKey; 027import java.nio.channels.SocketChannel; 028 029import javax.net.SocketFactory; 030 031import org.apache.activemq.transport.nio.NIOOutputStream; 032import org.apache.activemq.transport.nio.SelectorManager; 033import org.apache.activemq.transport.nio.SelectorSelection; 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; 038import org.slf4j.Logger; 039import org.slf4j.LoggerFactory; 040 041/** 042 * An implementation of the {@link org.apache.activemq.transport.Transport} interface for using AMQP over NIO 043 */ 044public class AmqpNioTransport extends TcpTransport { 045 046 private static final Logger LOG = LoggerFactory.getLogger(AmqpNioTransport.class); 047 048 private SocketChannel channel; 049 private SelectorSelection selection; 050 private final AmqpFrameParser frameReader = new AmqpFrameParser(this); 051 052 private ByteBuffer inputBuffer; 053 054 public AmqpNioTransport(WireFormat wireFormat, SocketFactory socketFactory, URI remoteLocation, URI localLocation) throws UnknownHostException, IOException { 055 super(wireFormat, socketFactory, remoteLocation, localLocation); 056 057 frameReader.setWireFormat((AmqpWireFormat) wireFormat); 058 } 059 060 public AmqpNioTransport(WireFormat wireFormat, Socket socket) throws IOException { 061 super(wireFormat, socket); 062 063 frameReader.setWireFormat((AmqpWireFormat) wireFormat); 064 } 065 066 @Override 067 protected void initializeStreams() throws IOException { 068 channel = socket.getChannel(); 069 channel.configureBlocking(false); 070 // listen for events telling us when the socket is readable. 071 selection = SelectorManager.getInstance().register(channel, new SelectorManager.Listener() { 072 @Override 073 public void onSelect(SelectorSelection selection) { 074 if (!isStopped()) { 075 serviceRead(); 076 } 077 } 078 079 @Override 080 public void onError(SelectorSelection selection, Throwable error) { 081 LOG.trace("Error detected: {}", error.getMessage()); 082 if (error instanceof IOException) { 083 onException((IOException) error); 084 } else { 085 onException(IOExceptionSupport.create(error)); 086 } 087 } 088 }); 089 090 inputBuffer = ByteBuffer.allocate(8 * 1024); 091 NIOOutputStream outPutStream = new NIOOutputStream(channel, 8 * 1024); 092 this.dataOut = new DataOutputStream(outPutStream); 093 this.buffOut = outPutStream; 094 } 095 096 boolean magicRead = false; 097 098 private void serviceRead() { 099 try { 100 101 while (isStarted()) { 102 // read channel 103 int readSize = channel.read(inputBuffer); 104 // channel is closed, cleanup 105 if (readSize == -1) { 106 onException(new EOFException()); 107 selection.close(); 108 break; 109 } 110 // nothing more to read, break 111 if (readSize == 0) { 112 break; 113 } 114 115 receiveCounter += readSize; 116 117 inputBuffer.flip(); 118 frameReader.parse(inputBuffer); 119 inputBuffer.clear(); 120 } 121 } catch (IOException e) { 122 onException(e); 123 } catch (Throwable e) { 124 onException(IOExceptionSupport.create(e)); 125 } 126 } 127 128 @Override 129 protected void doStart() throws Exception { 130 connect(); 131 selection.setInterestOps(SelectionKey.OP_READ); 132 selection.enable(); 133 } 134 135 @Override 136 protected void doStop(ServiceStopper stopper) throws Exception { 137 try { 138 if (selection != null) { 139 selection.close(); 140 } 141 } finally { 142 super.doStop(stopper); 143 } 144 } 145}