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Java > Open Source Codes > org > jboss > kernel > plugins > event > AbstractEventManager


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.kernel.plugins.event;
23
24 import org.jboss.kernel.Kernel;
25 import org.jboss.kernel.plugins.AbstractKernelObject;
26 import org.jboss.kernel.spi.event.KernelEventEmitter;
27 import org.jboss.kernel.spi.event.KernelEventFilter;
28 import org.jboss.kernel.spi.event.KernelEventListener;
29 import org.jboss.kernel.spi.event.KernelEventManager;
30 import org.jboss.kernel.spi.registry.KernelRegistry;
31 import org.jboss.kernel.spi.registry.KernelRegistryEntry;
32
33 /**
34  * Abstract Event manager.
35  *
36  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
37  * @version $Revision: 40756 $
38  */
39 public class AbstractEventManager extends AbstractKernelObject implements KernelEventManager
40 {
41    /** The registry */
42    protected KernelRegistry registry;
43
44    /**
45     * Create a new abstract kernel manager
46     *
47     * @throws Throwable for any error
48     */
49    public AbstractEventManager() throws Throwable JavaDoc
50    {
51    }
52    
53    public void setKernel(Kernel kernel) throws Throwable JavaDoc
54    {
55       super.setKernel(kernel);
56       registry = kernel.getRegistry();
57    }
58
59    public void registerListener(Object JavaDoc name, KernelEventListener listener, KernelEventFilter filter, Object JavaDoc handback) throws Throwable JavaDoc
60    {
61       getEmitter(name).registerListener(listener, filter, handback);
62    }
63
64    public void unregisterListener(Object JavaDoc name, KernelEventListener listener, KernelEventFilter filter, Object JavaDoc handback) throws Throwable JavaDoc
65    {
66       getEmitter(name).unregisterListener(listener, filter, handback);
67    }
68    
69    protected KernelEventEmitter getEmitter(Object JavaDoc name) throws Throwable JavaDoc
70    {
71       KernelRegistryEntry entry = registry.getEntry(name);
72
73       Object JavaDoc object = entry.getTarget();
74       if (object == null || object instanceof KernelEventEmitter == false)
75          throw new ClassCastException JavaDoc(name + " is not a " + KernelEventEmitter.class.getName());
76       
77       return (KernelEventEmitter) object;
78    }
79 }
80
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