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package com.c2kernel.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 com.c2kernel.common.InvalidDataException;
import com.c2kernel.utils.Logger;
import com.c2kernel.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 sysKeys;
PrintWriter response;
BufferedReader request;
boolean closing = false;
public ProxyClientConnection() {
super();
thisClientId = ++clientId;
EntityProxyManager.registerProxyClient(this);
Logger.msg(1, "Proxy Client Connection Handler "+thisClientId+" ready.");
}
public String getName() {
return "Proxy Client Connection";
}
public boolean isBusy() {
return clientSocket != null;
}
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);
sysKeys = new ArrayList();
} 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.
*/
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.getSysKey());
synchronized (sysKeys) {
sysKeys.add(new Integer(message.getSysKey()));
}
}
// remove of subscription to entity changes
else if (message.getPath().equals(ProxyMessage.DELPATH)) {
synchronized (sysKeys) {
sysKeys.remove(new Integer(message.getSysKey()));
}
Logger.msg(7, "ProxyClientConnection "+thisClientId+" unsubscribed from "+message.getSysKey());
}
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.getSysKey() == ProxyMessage.NA;
synchronized (sysKeys) {
for (Iterator iter = sysKeys.iterator(); iter.hasNext() && !relevant;) {
Integer thisKey = (Integer)iter.next();
if (thisKey.intValue() == message.getSysKey())
relevant = true;
}
}
if (!relevant) return; // not for our client
response.println(message);
}
public void shutdown() {
if (isBusy()) {
closing = true;
Logger.msg("ProxyClientConnection "+thisClientId+" closing.");
closeSocket();
}
}
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 (sysKeys) {
sysKeys = null;
}
clientSocket = null;
}
}
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