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/*
* 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</code> 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
*
*/
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</code> for a TCP NIO socket channel
* @param channel - the channel to be read.
*/
public ObjectReader(SocketChannel channel) {
this(channel.socket());
}
/**
* Creates an <code>ObjectReader</code> 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 len length in buffer
* @return number of messages that sent 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.ReceiverBase#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;
}
}
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