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/**
* This file is part of the CRISTAL-iSE kernel.
* Copyright (c) 2001-2014 The CRISTAL Consortium. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* http://www.fsf.org/licensing/licenses/lgpl.html
*/
package org.cristalise.kernel.entity.proxy;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Iterator;
import org.cristalise.kernel.common.InvalidDataException;
import org.cristalise.kernel.lookup.ItemPath;
import org.cristalise.kernel.process.Gateway;
import org.cristalise.kernel.utils.Logger;
import org.cristalise.kernel.utils.server.SocketHandler;
/**************************************************************************
*
* $Revision: 1.18 $
* $Date: 2005/05/10 11:40:09 $
*
* Copyright (C) 2003 CERN - European Organization for Nuclear Research
* All rights reserved.
**************************************************************************/
public class ProxyClientConnection implements SocketHandler {
Socket clientSocket = null;
static int clientId = -1;
int thisClientId;
ArrayList<ItemPath> subscribedItems;
PrintWriter response;
BufferedReader request;
boolean closing = false;
public ProxyClientConnection() {
super();
thisClientId = ++clientId;
Gateway.getProxyServer().registerProxyClient(this);
Logger.msg(1, "Proxy Client Connection Handler "+thisClientId+" ready.");
}
@Override
public String getName() {
return "Proxy Client Connection";
}
@Override
public boolean isBusy() {
return clientSocket != null;
}
@Override
public synchronized void setSocket(Socket newSocket) {
try {
Logger.msg(1, "Proxy Client Connection "+thisClientId+" connect from "+newSocket.getInetAddress()+":"+newSocket.getPort());
newSocket.setSoTimeout(500);
clientSocket = newSocket;
response = new PrintWriter(clientSocket.getOutputStream(), true);
subscribedItems = new ArrayList<ItemPath>();
} catch (SocketException ex) {
Logger.msg("Could not set socket timeout:");
Logger.error(ex);
closeSocket();
} catch (IOException ex) {
Logger.msg("Could not setup output stream:");
Logger.error(ex);
closeSocket();
}
}
/**
* Main loop. Reads proxy commands from the client and acts on them.
*/
@Override
public void run() {
Thread.currentThread().setName("Proxy Client Connection: "+clientSocket.getInetAddress());
Logger.msg(7, "ProxyClientConnection "+thisClientId+" - Setting up proxy client connection with "+clientSocket.getInetAddress());
try {
request = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String input = null;
ProxyMessage thisMessage;
while (clientSocket != null) {
try {
input = request.readLine();
Logger.msg(9, "ProxyClientConnection "+thisClientId+" - received "+input);
thisMessage = new ProxyMessage(input);
processMessage(thisMessage);
} catch (InterruptedIOException ex) { //timeout
} catch (InvalidDataException ex) { // invalid proxy message
Logger.error("ProxyClientConnection "+thisClientId+" - Invalid proxy message: "+input);
}
}
} catch (IOException ex) {
if (!closing)
Logger.error("ProxyClientConnection "+thisClientId+" - Error reading from socket.");
}
closeSocket();
Logger.msg(1, "ProxyClientConnection "+thisClientId+" closed.");
}
private void processMessage(ProxyMessage message) throws InvalidDataException {
// proxy disconnection
if (message.getPath().equals(ProxyMessage.BYEPATH)) {
Logger.msg(7, "ProxyClientConnection "+thisClientId+" disconnecting");
closeSocket();
}
// proxy checking connection
else if (message.getPath().equals(ProxyMessage.PINGPATH))
response.println(ProxyMessage.pingMessage);
// new subscription to entity changes
else if (message.getPath().equals(ProxyMessage.ADDPATH)) {
Logger.msg(7, "ProxyClientConnection "+thisClientId+" subscribed to "+message.getItemPath());
synchronized (subscribedItems) {
subscribedItems.add(message.getItemPath());
}
}
// remove of subscription to entity changes
else if (message.getPath().equals(ProxyMessage.DELPATH)) {
synchronized (subscribedItems) {
subscribedItems.remove(message.getItemPath());
}
Logger.msg(7, "ProxyClientConnection "+thisClientId+" unsubscribed from "+message.getItemPath());
}
else // unknown message
Logger.error("ProxyClientConnection "+thisClientId+" - Unknown message type: "+message);
}
public synchronized void sendMessage(ProxyMessage message) {
if (clientSocket==null) return; // idle
boolean relevant = message.getItemPath() == null;
synchronized (subscribedItems) {
for (Iterator<ItemPath> iter = subscribedItems.iterator(); iter.hasNext() && !relevant;) {
ItemPath thisKey = iter.next();
if (thisKey.equals(message.getItemPath()))
relevant = true;
}
}
if (!relevant) return; // not for our client
response.println(message);
}
@Override
public void shutdown() {
if (isBusy()) {
closing = true;
Logger.msg("ProxyClientConnection "+thisClientId+" closing.");
closeSocket();
}
}
@Override
public String toString() {
if (clientSocket == null) return thisClientId+": idle";
else return thisClientId+": "+clientSocket.getInetAddress();
}
private synchronized void closeSocket() {
if (clientSocket==null) return;
try {
request.close();
response.close();
clientSocket.close();
} catch (IOException e) {
Logger.error("ProxyClientConnection "+thisClientId+" - Could not close socket.");
Logger.error(e);
}
synchronized (subscribedItems) {
subscribedItems = null;
}
clientSocket = null;
}
}
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