| /** |
| * 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.activemq.transport.stomp; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.DataOutputStream; |
| import java.io.EOFException; |
| import java.io.IOException; |
| import java.net.Socket; |
| import java.net.URI; |
| import java.net.UnknownHostException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.SelectionKey; |
| import java.nio.channels.SocketChannel; |
| import java.util.HashMap; |
| |
| import javax.net.SocketFactory; |
| |
| import org.apache.activemq.command.Command; |
| import org.apache.activemq.transport.Transport; |
| import org.apache.activemq.transport.nio.NIOOutputStream; |
| import org.apache.activemq.transport.nio.SelectorManager; |
| import org.apache.activemq.transport.nio.SelectorSelection; |
| import org.apache.activemq.transport.tcp.TcpTransport; |
| import org.apache.activemq.util.ByteArrayOutputStream; |
| import org.apache.activemq.util.ByteSequence; |
| import org.apache.activemq.util.DataByteArrayInputStream; |
| import org.apache.activemq.util.IOExceptionSupport; |
| import org.apache.activemq.util.ServiceStopper; |
| import org.apache.activemq.wireformat.WireFormat; |
| |
| /** |
| * An implementation of the {@link Transport} interface for using Stomp over NIO |
| * |
| * |
| */ |
| public class StompNIOTransport extends TcpTransport { |
| |
| private SocketChannel channel; |
| private SelectorSelection selection; |
| |
| private ByteBuffer inputBuffer; |
| ByteArrayOutputStream currentCommand = new ByteArrayOutputStream(); |
| boolean processedHeaders = false; |
| String action; |
| HashMap<String, String> headers; |
| int contentLength = -1; |
| int readLength = 0; |
| int previousByte = -1; |
| |
| public StompNIOTransport(WireFormat wireFormat, SocketFactory socketFactory, URI remoteLocation, URI localLocation) throws UnknownHostException, IOException { |
| super(wireFormat, socketFactory, remoteLocation, localLocation); |
| } |
| |
| public StompNIOTransport(WireFormat wireFormat, Socket socket) throws IOException { |
| super(wireFormat, socket); |
| } |
| |
| protected void initializeStreams() throws IOException { |
| channel = socket.getChannel(); |
| channel.configureBlocking(false); |
| |
| // listen for events telling us when the socket is readable. |
| selection = SelectorManager.getInstance().register(channel, new SelectorManager.Listener() { |
| public void onSelect(SelectorSelection selection) { |
| serviceRead(); |
| } |
| |
| public void onError(SelectorSelection selection, Throwable error) { |
| if (error instanceof IOException) { |
| onException((IOException)error); |
| } else { |
| onException(IOExceptionSupport.create(error)); |
| } |
| } |
| }); |
| |
| inputBuffer = ByteBuffer.allocate(8 * 1024); |
| NIOOutputStream outPutStream = new NIOOutputStream(channel, 8 * 1024); |
| this.dataOut = new DataOutputStream(outPutStream); |
| this.buffOut = outPutStream; |
| } |
| |
| private void serviceRead() { |
| try { |
| |
| while (true) { |
| // read channel |
| int readSize = channel.read(inputBuffer); |
| // channel is closed, cleanup |
| if (readSize == -1) { |
| onException(new EOFException()); |
| selection.close(); |
| break; |
| } |
| // nothing more to read, break |
| if (readSize == 0) { |
| break; |
| } |
| |
| inputBuffer.flip(); |
| |
| int b; |
| ByteArrayInputStream input = new ByteArrayInputStream(inputBuffer.array()); |
| |
| int i = 0; |
| while(i++ < readSize) { |
| b = input.read(); |
| // skip repeating nulls |
| if (!processedHeaders && previousByte == 0 && b == 0) { |
| continue; |
| } |
| |
| if (!processedHeaders) { |
| currentCommand.write(b); |
| // end of headers section, parse action and header |
| if (previousByte == '\n' && b == '\n') { |
| if (wireFormat instanceof StompWireFormat) { |
| DataByteArrayInputStream data = new DataByteArrayInputStream(currentCommand.toByteArray()); |
| action = ((StompWireFormat)wireFormat).parseAction(data); |
| headers = ((StompWireFormat)wireFormat).parseHeaders(data); |
| String contentLengthHeader = headers.get(Stomp.Headers.CONTENT_LENGTH); |
| if (contentLengthHeader != null) { |
| contentLength = ((StompWireFormat)wireFormat).parseContentLength(contentLengthHeader); |
| } else { |
| contentLength = -1; |
| } |
| } |
| processedHeaders = true; |
| currentCommand.reset(); |
| } |
| } else { |
| |
| if (contentLength == -1) { |
| // end of command reached, unmarshal |
| if (b == 0) { |
| processCommand(); |
| } else { |
| currentCommand.write(b); |
| } |
| } else { |
| // read desired content length |
| if (readLength++ == contentLength) { |
| processCommand(); |
| readLength = 0; |
| } else { |
| currentCommand.write(b); |
| } |
| } |
| } |
| |
| previousByte = b; |
| } |
| // clear the buffer |
| inputBuffer.clear(); |
| |
| } |
| } catch (IOException e) { |
| onException(e); |
| } catch (Throwable e) { |
| onException(IOExceptionSupport.create(e)); |
| } |
| } |
| |
| private void processCommand() throws Exception { |
| StompFrame frame = new StompFrame(action, headers, currentCommand.toByteArray()); |
| doConsume(frame); |
| processedHeaders = false; |
| currentCommand.reset(); |
| contentLength = -1; |
| } |
| |
| protected void doStart() throws Exception { |
| connect(); |
| selection.setInterestOps(SelectionKey.OP_READ); |
| selection.enable(); |
| } |
| |
| protected void doStop(ServiceStopper stopper) throws Exception { |
| try { |
| selection.close(); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| super.doStop(stopper); |
| } |
| } |