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Tomcat example source code file (ObjectReader.java)

This example Tomcat source code file (ObjectReader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

channelmessage, channelmessage, io, ioexception, net, network, nio, objectreader, objectreader, unable, unable, xbytebuffer, xbytebuffer

The Tomcat ObjectReader.java source code

/*
 * 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.catalina.tribes.io;

import java.io.IOException;
import java.net.Socket;
import java.nio.ByteBuffer;
import java.nio.channels.SocketChannel;

import org.apache.catalina.tribes.ChannelMessage;



/**
 * The object reader object is an object used in conjunction with
 * java.nio TCP messages. This object stores the message bytes in a
 * <code>XByteBuffer until a full package has been received.
 * This object uses an XByteBuffer which is an extendable object buffer that also allows
 * for message encoding and decoding.
 *
 * @author Filip Hanik
 * @version $Revision: 467173 $, $Date: 2006-10-24 01:12:17 +0200 (mar., 24 oct. 2006) $
 */
public class ObjectReader {

    protected static org.apache.juli.logging.Log log = org.apache.juli.logging.LogFactory.getLog(ObjectReader.class);

    private XByteBuffer buffer;
    
    protected long lastAccess = System.currentTimeMillis();
    
    protected boolean accessed = false;
    private boolean cancelled;

    /**
     * Creates an <code>ObjectReader for a TCP NIO socket channel
     * @param channel - the channel to be read.
     */
    public ObjectReader(SocketChannel channel) {
        this(channel.socket());
    }
    
    /**
     * Creates an <code>ObjectReader for a TCP socket
     * @param socket Socket
     */
    public ObjectReader(Socket socket) {
        try{
            this.buffer = new XByteBuffer(socket.getReceiveBufferSize(), true);
        }catch ( IOException x ) {
            //unable to get buffer size
            log.warn("Unable to retrieve the socket receiver buffer size, setting to default 43800 bytes.");
            this.buffer = new XByteBuffer(43800,true);
        }
    }
    
    public synchronized void access() {
        this.accessed = true;
        this.lastAccess = System.currentTimeMillis();
    }
    
    public synchronized void finish() {
        this.accessed = false;
        this.lastAccess = System.currentTimeMillis();
    }
    
    public boolean isAccessed() {
        return this.accessed;
    }

    /**
     * Append new bytes to buffer. 
     * @see XByteBuffer#countPackages()
     * @param data new transfer buffer
     * @param off offset
     * @param len length in buffer
     * @return number of messages that sended to callback
     * @throws java.io.IOException
     */
    public int append(ByteBuffer data, int len, boolean count) throws java.io.IOException {
       buffer.append(data,len);
       int pkgCnt = -1;
       if ( count ) pkgCnt = buffer.countPackages();
       return pkgCnt;
   }

     public int append(byte[] data,int off,int len, boolean count) throws java.io.IOException {
        buffer.append(data,off,len);
        int pkgCnt = -1;
        if ( count ) pkgCnt = buffer.countPackages();
        return pkgCnt;
    }

    /**
     * Send buffer to cluster listener (callback).
     * Is message complete receiver send message to callback?
     *
     * @see org.apache.catalina.tribes.transport.ClusterReceiverBase#messageDataReceived(ChannelMessage)
     * @see XByteBuffer#doesPackageExist()
     * @see XByteBuffer#extractPackage(boolean)
     *
     * @return number of received packages/messages
     * @throws java.io.IOException
     */
    public ChannelMessage[] execute() throws java.io.IOException {
        int pkgCnt = buffer.countPackages();
        ChannelMessage[] result = new ChannelMessage[pkgCnt];
        for (int i=0; i<pkgCnt; i++)  {
            ChannelMessage data = buffer.extractPackage(true);
            result[i] = data;
        }
        return result;
    }
    
    public int bufferSize() {
        return buffer.getLength();
    }
    

    public boolean hasPackage() {
        return buffer.countPackages(true)>0;
    }
    /**
     * Returns the number of packages that the reader has read
     * @return int
     */
    public int count() {
        return buffer.countPackages();
    }
    
    public void close() {
        this.buffer = null;
    }

    public long getLastAccess() {
        return lastAccess;
    }

    public boolean isCancelled() {
        return cancelled;
    }

    public void setLastAccess(long lastAccess) {
        this.lastAccess = lastAccess;
    }

    public void setCancelled(boolean cancelled) {
        this.cancelled = cancelled;
    }

}

Other Tomcat examples (source code examples)

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