| /********************************************************************** |
| * Copyright (c) 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - Initial API and implementation |
| **********************************************************************/ |
| package org.eclipse.wst.server.core.internal; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.eclipse.wst.server.core.IServerListener; |
| import org.eclipse.wst.server.core.ServerEvent; |
| /** |
| * Notification manager for server. |
| */ |
| public class ServerNotificationManager { |
| private List listenerList = new ArrayList(); |
| |
| /** |
| * For masking event on all changes. |
| */ |
| public static final int ALL_EVENTS = 0xFFFF; |
| |
| private class ListenerEntry { |
| private IServerListener listener; |
| private int eventMask; |
| |
| private ListenerEntry(IServerListener curListener, int curEventMask) { |
| listener = curListener; |
| eventMask = curEventMask; |
| } |
| |
| protected IServerListener getListener() { |
| return listener; |
| } |
| |
| protected int getEventMask() { |
| return eventMask; |
| } |
| } |
| |
| /** |
| * Create a new notification manager. |
| */ |
| public ServerNotificationManager() { |
| super(); |
| } |
| |
| /** |
| * Add listener for all events. |
| * |
| * @param curListener |
| */ |
| public void addListener(IServerListener curListener) { |
| addListener(curListener, ALL_EVENTS); |
| } |
| |
| /** |
| * Add listener for the events specified by the mask. |
| * |
| * @param curListener |
| * @param eventMask |
| */ |
| public void addListener(IServerListener curListener, int eventMask) { |
| Trace.trace(Trace.FINEST, "->- Adding server listener to notification manager: " + curListener + " " + eventMask + " ->-"); |
| if (curListener == null) { |
| return; |
| } |
| |
| synchronized (listenerList) { |
| listenerList.add(new ListenerEntry(curListener, eventMask)); |
| } |
| } |
| |
| protected void broadcastChange(ServerEvent event) { |
| Trace.trace(Trace.FINEST, "->- Broadcasting server event: " + event + " ->-"); |
| if (event == null) { |
| return; |
| } |
| int eventKind = event.getKind(); |
| Trace.trace(Trace.FINEST, " Server event kind: " + eventKind + " ->-"); |
| |
| // only notify listeners that listen to module event |
| int size; |
| ListenerEntry[] listeners; |
| synchronized (listenerList) { |
| size = listenerList.size(); |
| listeners = (ListenerEntry[]) listenerList.toArray(new ListenerEntry[size]); |
| } |
| for (int i = 0; i < size; i++) { |
| ListenerEntry curEntry = listeners[i]; |
| int mask = curEntry.getEventMask(); |
| |
| // check if the type of the event matches the mask, e.g. server or module change |
| boolean isTypeMatch = ((mask & eventKind & ServerEvent.SERVER_CHANGE) != 0) |
| || ((mask & eventKind & ServerEvent.MODULE_CHANGE) != 0); |
| // check the kind of change |
| boolean isKindMatch = (mask & eventKind ^ ServerEvent.SERVER_CHANGE ^ ServerEvent.MODULE_CHANGE) != 0; |
| |
| if (isTypeMatch && isKindMatch) { |
| Trace.trace(Trace.FINEST, "->- Firing server event to listener: " + curEntry.getListener() + " ->-"); |
| try { |
| Trace.trace(Trace.LISTENERS, " Firing server event to listener: " + curEntry.getListener()); |
| curEntry.getListener().serverChanged(event); |
| } catch (Exception e) { |
| Trace.trace(Trace.SEVERE, " Error firing server event: " + curEntry.getListener(), e); |
| } |
| Trace.trace(Trace.LISTENERS, "-<- Done Firing server event -<-"); |
| } |
| } |
| Trace.trace(Trace.FINEST, "-<- Done broadcasting server event -<-"); |
| } |
| |
| /** |
| * Returns true if the listener list is not empty; otherwise, returns false. |
| * |
| * @return true if the listener list is not empty; otherwise, returns false |
| */ |
| protected boolean hasListenerEntries() { |
| return listenerList.size() == 0; |
| } |
| |
| /** |
| * Remove a listener from notification. |
| * |
| * @param curListener |
| */ |
| public void removeListener(IServerListener curListener) { |
| Trace.trace(Trace.FINEST, "->- Removing server listener from notification manager: " + curListener + " ->-"); |
| if (curListener == null) { |
| return; |
| } |
| ListenerEntry matchedListenerEntry = null; |
| Iterator listenerIter = listenerList.iterator(); |
| while (matchedListenerEntry == null && listenerIter.hasNext()) { |
| ListenerEntry curEntry = (ListenerEntry)listenerIter.next(); |
| if (curListener.equals(curEntry.getListener())) { |
| matchedListenerEntry = curEntry; |
| } |
| } |
| if (matchedListenerEntry != null) { |
| synchronized (listenerList) { |
| listenerList.remove(matchedListenerEntry); |
| } |
| } |
| } |
| } |