/**
*
* Copyright 2003-2004 The Apache Software Foundation
*
* 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.apache.geronimo.kernel.basic;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.management.ObjectName;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.geronimo.kernel.Kernel;
import org.apache.geronimo.kernel.lifecycle.LifecycleMonitor;
import org.apache.geronimo.kernel.lifecycle.LifecycleListener;
import org.apache.geronimo.gbean.runtime.LifecycleBroadcaster;
/**
* @version $Rev: 71492 $ $Date: 2004-11-14 21:31:50 -0800 (Sun, 14 Nov 2004) $
*/
public class BasicLifecycleMonitor implements LifecycleMonitor {
private static final Log log = LogFactory.getLog(BasicLifecycleMonitor.class);
private final Kernel kernel;
// todo we should only hold weak references to the listeners
private final Map boundListeners = new HashMap();
private final Map listenerPatterns = new HashMap();
public BasicLifecycleMonitor(Kernel kernel) {
this.kernel = kernel;
// register for state change notifications with all mbeans that match the target patterns
Set names = this.kernel.listGBeans((ObjectName)null);
for (Iterator objectNameIterator = names.iterator(); objectNameIterator.hasNext();) {
addSource((ObjectName) objectNameIterator.next());
}
}
public synchronized void destroy() {
boundListeners.clear();
listenerPatterns.clear();
}
private synchronized void addSource(ObjectName source) {
if (boundListeners.containsKey(source)) {
// already registered
return;
}
// find all listeners interested in events from this source
HashSet listeners = new HashSet();
for (Iterator listenerIterator = listenerPatterns.entrySet().iterator(); listenerIterator.hasNext();) {
Map.Entry entry = (Map.Entry) listenerIterator.next();
Set patterns = (Set) entry.getValue();
for (Iterator patternIterator = patterns.iterator(); patternIterator.hasNext();) {
ObjectName pattern = (ObjectName) patternIterator.next();
if (pattern.apply(source)) {
LifecycleListener listener = (LifecycleListener) entry.getKey();
listeners.add(listener);
}
}
}
boundListeners.put(source, listeners);
}
private synchronized void removeSource(ObjectName source) {
boundListeners.remove(source);
}
public synchronized void addLifecycleListener(LifecycleListener listener, ObjectName pattern) {
addLifecycleListener(listener, Collections.singleton(pattern));
}
public synchronized void addLifecycleListener(LifecycleListener listener, Set patterns) {
for (Iterator patternIterator = patterns.iterator(); patternIterator.hasNext();) {
ObjectName pattern = (ObjectName) patternIterator.next();
for (Iterator iterator = boundListeners.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
ObjectName source = (ObjectName) entry.getKey();
if (pattern.apply(source)) {
Set listeners = (Set) entry.getValue();
listeners.add(listener);
}
}
}
listenerPatterns.put(listener, patterns);
}
public synchronized void removeLifecycleListener(LifecycleListener listener) {
for (Iterator iterator = boundListeners.values().iterator(); iterator.hasNext();) {
Set set = (Set) iterator.next();
set.remove(listener);
}
listenerPatterns.remove(listener);
}
private synchronized Set getTargets(ObjectName source) {
Set targets = (Set) boundListeners.get(source);
if (targets == null) {
// no one is interested in this event
return Collections.EMPTY_SET;
} else {
return new HashSet(targets);
}
}
private void fireLoadedEvent(ObjectName objectName) {
Set targets = getTargets(objectName);
for (Iterator iterator = targets.iterator(); iterator.hasNext();) {
LifecycleListener listener = (LifecycleListener) iterator.next();
try {
listener.loaded(objectName);
} catch (Throwable e) {
log.warn("Exception occured while notifying listener", e);
}
}
}
private void fireStartingEvent(ObjectName source) {
Set targets = getTargets(source);
for (Iterator iterator = targets.iterator(); iterator.hasNext();) {
LifecycleListener listener = (LifecycleListener) iterator.next();
try {
listener.starting(source);
} catch (Throwable e) {
log.warn("Exception occured while notifying listener", e);
}
}
}
private void fireRunningEvent(ObjectName source) {
Set targets = getTargets(source);
for (Iterator iterator = targets.iterator(); iterator.hasNext();) {
LifecycleListener listener = (LifecycleListener) iterator.next();
try {
listener.running(source);
} catch (Throwable e) {
log.warn("Exception occured while notifying listener", e);
}
}
}
private void fireStoppingEvent(ObjectName source) {
Set targets = getTargets(source);
for (Iterator iterator = targets.iterator(); iterator.hasNext();) {
LifecycleListener listener = (LifecycleListener) iterator.next();
try {
listener.stopping(source);
} catch (Throwable e) {
log.warn("Exception occured while notifying listener", e);
}
}
}
private void fireStoppedEvent(ObjectName source) {
Set targets = getTargets(source);
for (Iterator iterator = targets.iterator(); iterator.hasNext();) {
LifecycleListener listener = (LifecycleListener) iterator.next();
try {
listener.stopped(source);
} catch (Throwable e) {
log.warn("Exception occured while notifying listener", e);
}
}
}
private void fireFailedEvent(ObjectName source) {
Set targets = getTargets(source);
for (Iterator iterator = targets.iterator(); iterator.hasNext();) {
LifecycleListener listener = (LifecycleListener) iterator.next();
try {
listener.failed(source);
} catch (Throwable e) {
log.warn("Exception occured while notifying listener", e);
}
}
}
private void fireUnloadedEvent(ObjectName source) {
Set targets = getTargets(source);
for (Iterator iterator = targets.iterator(); iterator.hasNext();) {
LifecycleListener listener = (LifecycleListener) iterator.next();
try {
listener.unloaded(source);
} catch (Throwable e) {
log.warn("Exception occured while notifying listener", e);
}
}
}
public LifecycleBroadcaster createLifecycleBroadcaster(ObjectName objectName) {
return new RawLifecycleBroadcaster(objectName);
}
private class RawLifecycleBroadcaster implements LifecycleBroadcaster {
private final ObjectName objectName;
public RawLifecycleBroadcaster(ObjectName objectName) {
this.objectName = objectName;
}
public void fireLoadedEvent() {
addSource(objectName);
BasicLifecycleMonitor.this.fireLoadedEvent(objectName);
}
public void fireStartingEvent() {
BasicLifecycleMonitor.this.fireStartingEvent(objectName);
}
public void fireRunningEvent() {
BasicLifecycleMonitor.this.fireRunningEvent(objectName);
}
public void fireStoppingEvent() {
BasicLifecycleMonitor.this.fireStoppingEvent(objectName);
}
public void fireStoppedEvent() {
BasicLifecycleMonitor.this.fireStoppedEvent(objectName);
}
public void fireFailedEvent() {
BasicLifecycleMonitor.this.fireFailedEvent(objectName);
}
public void fireUnloadedEvent() {
BasicLifecycleMonitor.this.fireUnloadedEvent(objectName);
removeSource(objectName);
}
}
}