/*
* XNap
*
* A pure java file sharing client.
*
* See AUTHORS for copyright information.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
package xnap.plugin.nap.net.msg;
import xnap.plugin.nap.Plugin;
import xnap.plugin.nap.net.Server;
import xnap.plugin.nap.util.Connector;
import xnap.plugin.nap.net.msg.client.ClientMessage;
import java.io.*;
import java.util.*;
import org.apache.log4j.Logger;
public class SendQueue {
//--- Constant(s) ---
//--- Data field(s) ---
private static Logger logger = Logger.getLogger(SendQueue.class);
/**
* Queued messages.
*/
private LinkedList queue = new LinkedList();
/**
* Associated server.
*/
private Server server;
private boolean locked = false;
//--- Constructor(s) ---
public SendQueue(Server server)
{
this.server = server;
}
//--- Method(s) ---
/**
* Returns true, if a send worker needs to be notified.
*/
public synchronized boolean add(ClientMessage msg, boolean lowPriority)
{
if (lowPriority) {
queue.addLast(msg);
}
else {
queue.addFirst(msg);
}
//logger.debug(server + ": " + queue.size() + " queued");
return !isLocked();
}
/**
* Worker could not send message, because server has died.
* Remove all pending messages.
*/
public synchronized void clear()
{
logger.debug("removing all " + queue.size()
+ " messages for: " + server);
for (Iterator i = queue.iterator(); i.hasNext();) {
ClientMessage msg = (ClientMessage)i.next();
if (msg.listener != null) {
msg.listener.exceptionThrown
(new IOException(Plugin.tr("Server disconnected")));
}
}
queue.clear();
setLocked(false);
}
public Server getServer()
{
return server;
}
/**
* Returns true, if a send worker is currently sending messages from this queue.
*/
public synchronized boolean isLocked()
{
return locked;
}
/**
* Removes the top message from the queue.
*
* @return if queue is not empty, top message; null otherwise
*/
public synchronized ClientMessage pop()
{
//logger.debug("popping from + " + server ": " + queue.size() + " queued");
if (queue.isEmpty()) {
setLocked(false);
return null;
}
return (ClientMessage)queue.removeFirst();
}
public synchronized void setLocked(boolean newValue)
{
locked = newValue;
}
}