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.auto.nio;
018
019import java.io.IOException;
020import java.net.Socket;
021import java.net.URI;
022import java.net.UnknownHostException;
023
024import javax.net.SocketFactory;
025
026import org.apache.activemq.transport.nio.NIOTransport;
027import org.apache.activemq.wireformat.WireFormat;
028
029/**
030 *
031 *
032 */
033public class AutoNIOTransport extends NIOTransport {
034
035    public AutoNIOTransport(WireFormat format, Socket socket,
036            InitBuffer initBuffer) throws IOException {
037        super(format, socket, initBuffer);
038    }
039
040    public AutoNIOTransport(WireFormat wireFormat, Socket socket)
041            throws IOException {
042        super(wireFormat, socket);
043    }
044
045    public AutoNIOTransport(WireFormat wireFormat, SocketFactory socketFactory,
046            URI remoteLocation, URI localLocation) throws UnknownHostException,
047            IOException {
048        super(wireFormat, socketFactory, remoteLocation, localLocation);
049    }
050
051
052    boolean doneInitBuffer = false;
053
054    /**
055     * Read from the initial buffer if it is set
056     */
057    @Override
058    protected int readFromBuffer() throws IOException {
059        int readSize = 0;
060        if (!doneInitBuffer) {
061            if (initBuffer == null || initBuffer.readSize < 8) {
062                throw new IOException("Protocol type could not be determined.");
063            }
064            if (nextFrameSize == -1) {
065                readSize = 4;
066                this.initBuffer.buffer.flip();
067                if (this.initBuffer.buffer.remaining() < 8) {
068                    throw new IOException("Protocol type could not be determined.");
069                }
070                for (int i = 0; i < 4; i++) {
071                    currentBuffer.put(initBuffer.buffer.get());
072                }
073            } else {
074                for (int i = 0; i < 4; i++) {
075                    currentBuffer.put(initBuffer.buffer.get());
076                }
077                readSize = 4;
078                doneInitBuffer = true;
079            }
080
081        } else {
082            readSize += channel.read(currentBuffer);
083        }
084        return readSize;
085    }
086
087
088}