/*
* 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.gui.util;
import xnap.util.EventList;
import xnap.util.Preferences;
import xnap.util.event.ListEvent;
import xnap.util.event.ListListener;
import java.awt.*;
import java.util.*;
import javax.swing.*;
import org.apache.log4j.Logger;
/**
*/
public class SwingSynchronizedCache implements ListListener
{
//--- Constant(s) ---
//--- Data field(s) ---
private LinkedList insertCache = new LinkedList();
private ListListener listener;
private boolean insertPending = false;
private volatile int maxInsertsPerRun = 100;
//--- Constructor(s) ---
public SwingSynchronizedCache(EventList list, ListListener listener)
{
this.listener = listener;
list.addListListener(this);
}
public SwingSynchronizedCache(ListListener listener)
{
this.listener = listener;
}
//--- Method(s) ---
public void addToCache(ListEvent event)
{
synchronized (insertCache) {
insertCache.addLast(event);
if (insertPending) {
return;
}
insertPending = true;
}
SwingUtilities.invokeLater(new InsertRunnable());
}
public void elementAdded(ListEvent event)
{
addToCache(event);
}
public void elementRemoved(ListEvent event)
{
if (event.getID() == ListEvent.LIST_CLEARED) {
synchronized (insertCache) {
insertCache.clear();
insertPending = false;
addToCache(event);
}
}
else {
addToCache(event);
}
}
public void setMaxInsertsPerRun(int newValue)
{
maxInsertsPerRun = newValue;
}
private class InsertRunnable implements Runnable
{
public void run()
{
synchronized (insertCache) {
int j = 0;
for (Iterator i = insertCache.iterator();
i.hasNext() && j < maxInsertsPerRun; j++) {
ListEvent e = (ListEvent)i.next();
if (e.getID() == ListEvent.ELEMENT_ADDED) {
listener.elementAdded(e);
}
else {
listener.elementRemoved(e);
}
i.remove();
}
if (insertCache.size() > 0) {
SwingUtilities.invokeLater(this);
}
else {
insertPending = false;
}
}
}
}
}