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.stomp; 018 019import java.io.ByteArrayInputStream; 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.transport.Transport; 033import org.apache.activemq.transport.nio.NIOOutputStream; 034import org.apache.activemq.transport.nio.SelectorManager; 035import org.apache.activemq.transport.nio.SelectorSelection; 036import org.apache.activemq.transport.tcp.TcpTransport; 037import org.apache.activemq.util.IOExceptionSupport; 038import org.apache.activemq.util.ServiceStopper; 039import org.apache.activemq.wireformat.WireFormat; 040 041/** 042 * An implementation of the {@link Transport} interface for using Stomp over NIO 043 */ 044public class StompNIOTransport extends TcpTransport { 045 046 private SocketChannel channel; 047 private SelectorSelection selection; 048 049 private ByteBuffer inputBuffer; 050 StompCodec codec; 051 052 public StompNIOTransport(WireFormat wireFormat, SocketFactory socketFactory, URI remoteLocation, URI localLocation) throws UnknownHostException, IOException { 053 super(wireFormat, socketFactory, remoteLocation, localLocation); 054 } 055 056 public StompNIOTransport(WireFormat wireFormat, Socket socket) throws IOException { 057 super(wireFormat, socket); 058 } 059 060 @Override 061 protected void initializeStreams() throws IOException { 062 channel = socket.getChannel(); 063 channel.configureBlocking(false); 064 065 // listen for events telling us when the socket is readable. 066 selection = SelectorManager.getInstance().register(channel, new SelectorManager.Listener() { 067 @Override 068 public void onSelect(SelectorSelection selection) { 069 serviceRead(); 070 } 071 072 @Override 073 public void onError(SelectorSelection selection, Throwable error) { 074 if (error instanceof IOException) { 075 onException((IOException)error); 076 } else { 077 onException(IOExceptionSupport.create(error)); 078 } 079 } 080 }); 081 082 inputBuffer = ByteBuffer.allocate(8 * 1024); 083 NIOOutputStream outPutStream = new NIOOutputStream(channel, 8 * 1024); 084 this.dataOut = new DataOutputStream(outPutStream); 085 this.buffOut = outPutStream; 086 codec = new StompCodec(this); 087 } 088 089 private void serviceRead() { 090 try { 091 092 while (true) { 093 // read channel 094 int readSize = channel.read(inputBuffer); 095 // channel is closed, cleanup 096 if (readSize == -1) { 097 onException(new EOFException()); 098 selection.close(); 099 break; 100 } 101 102 // nothing more to read, break 103 if (readSize == 0) { 104 break; 105 } 106 107 receiveCounter += readSize; 108 109 inputBuffer.flip(); 110 111 ByteArrayInputStream input = new ByteArrayInputStream(inputBuffer.array()); 112 codec.parse(input, readSize); 113 114 // clear the buffer 115 inputBuffer.clear(); 116 } 117 } catch (IOException e) { 118 onException(e); 119 } catch (Throwable e) { 120 onException(IOExceptionSupport.create(e)); 121 } 122 } 123 124 @Override 125 protected void doStart() throws Exception { 126 connect(); 127 selection.setInterestOps(SelectionKey.OP_READ); 128 selection.enable(); 129 } 130 131 @Override 132 protected void doStop(ServiceStopper stopper) throws Exception { 133 try { 134 if (selection != null) { 135 selection.close(); 136 } 137 } finally { 138 super.doStop(stopper); 139 } 140 } 141}