Package org.jivesoftware.openfire.muc.cluster

Source Code of org.jivesoftware.openfire.muc.cluster.MUCRoomTask

/**
* $RCSfile: $
* $Revision: $
* $Date: $
*
* Copyright (C) 2005-2008 Jive Software. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package org.jivesoftware.openfire.muc.cluster;

import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;

import org.jivesoftware.openfire.XMPPServer;
import org.jivesoftware.openfire.cluster.ClusterManager;
import org.jivesoftware.openfire.muc.MultiUserChatService;
import org.jivesoftware.openfire.muc.spi.LocalMUCRoom;
import org.jivesoftware.util.cache.ClusterTask;
import org.jivesoftware.util.cache.ExternalizableUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
* Task related to a room to be executed in a cluster node. This is a base
* class to specific room tasks. The base class just keeps track of the room
* related to the task.
*
* @author Gaston Dombiak
*/
public abstract class MUCRoomTask implements ClusterTask {
 
  private static final Logger Log = LoggerFactory.getLogger(MUCRoomTask.class);

    private boolean originator;
    private String roomName;
    private String subdomain;

    protected MUCRoomTask() {
    }

    protected MUCRoomTask(LocalMUCRoom room) {
        this.roomName = room.getName();
        this.subdomain = room.getMUCService().getServiceName();
    }

    public LocalMUCRoom getRoom() {
        MultiUserChatService mucService = XMPPServer.getInstance().getMultiUserChatManager().getMultiUserChatService(subdomain);
        if (mucService == null) {
            throw new IllegalArgumentException("MUC service not found for subdomain: "+subdomain);
        }
        LocalMUCRoom room = (LocalMUCRoom) mucService.getChatRoom(roomName);
        if (room == null) {
            throw new IllegalArgumentException("Room not found: " + roomName);
        }
        return room;
    }

    /**
     * Executes the requested task considering that this JVM may still be joining the cluster.
     * This means that events regarding rooms that were not loaded yet will be stored for later
     * processing. Once the JVM is done joining the cluster queued tasks will be processed.
     *
     * @param runnable the task to execute.
     */
    protected void execute(Runnable runnable) {
        // Check if we are joining a cluster
        boolean clusterStarting = ClusterManager.isClusteringStarting();
        try {
            // Check that the room exists
            getRoom();
            // Room was found so now execute the task
            runnable.run();
        }
        catch (IllegalArgumentException e) {
            // Room not found so check if we are still joining the cluster
            if (clusterStarting) {
                // Queue task in case the cluster
                QueuedTasksManager.getInstance().addTask(this);
            }
            else {
                // Task failed since room was not found
                Log.error(e.getMessage(), e);
            }
        }
    }

    public boolean isOriginator() {
        return originator;
    }

    public void setOriginator(boolean originator) {
        this.originator = originator;
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        ExternalizableUtil.getInstance().writeBoolean(out, originator);
        ExternalizableUtil.getInstance().writeSafeUTF(out, roomName);
        ExternalizableUtil.getInstance().writeSafeUTF(out, subdomain);
    }

    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        originator = ExternalizableUtil.getInstance().readBoolean(in);
        roomName = ExternalizableUtil.getInstance().readSafeUTF(in);
        subdomain = ExternalizableUtil.getInstance().readSafeUTF(in);
    }
}
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