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package org.glassfish.admin.amx.util.jmx;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
*/
public class NotificationListenerTracking
{
// NotificationListeners are not unique, so we can't use a Map
private final List<NotificationListenerInfo> mInfos;
public NotificationListenerTracking(boolean synchronize)
{
final List<NotificationListenerInfo> infos =
new ArrayList<NotificationListenerInfo>();
mInfos = synchronize ? Collections.synchronizedList(infos) : infos;
}
public void addNotificationListener(
NotificationListener listener,
NotificationFilter filter,
Object handback)
{
final NotificationListenerInfo info =
new NotificationListenerInfo(listener, filter, handback);
mInfos.add(info);
}
public int getListenerCount()
{
return mInfos.size();
}
private final boolean listenersEqual(
final NotificationListener listener1,
final NotificationListener listener2)
{
return (listener1 == listener2);
}
private final boolean handbacksEqual(
final Object handback1,
final Object handback2)
{
return (handback1 == handback2);
}
/**
Remove <b>all instances</b> of the specified listener and return
their corresponding NotificationListenerInfo.
This behavior matches the behavior of
{@link javax.management.NotificationEmitter}.
@return list of NotificationListenerInfo
*/
public List<NotificationListenerInfo> removeNotificationListener(final NotificationListener listener)
{
final Iterator iter = mInfos.iterator();
final List<NotificationListenerInfo> results = new ArrayList<NotificationListenerInfo>();
while (iter.hasNext())
{
final NotificationListenerInfo info =
(NotificationListenerInfo) iter.next();
if (listenersEqual(listener, info.getListener()))
{
iter.remove();
results.add(info);
}
}
return (results);
}
/**
Remove <b>the first instance</b> of the specified listener/filter/handback
combination and return its corresponding NotificationListenerInfo.
This behavior matches the behavior of
{@link javax.management.NotificationEmitter}.
@return list of NotificationListenerInfo
*/
public NotificationListenerInfo removeNotificationListener(
final NotificationListener listener,
final NotificationFilter filter,
final Object handback)
{
final Iterator iter = mInfos.iterator();
NotificationListenerInfo result = null;
while (iter.hasNext())
{
final NotificationListenerInfo info =
(NotificationListenerInfo) iter.next();
if (listenersEqual(listener, info.getListener()) &&
handbacksEqual(handback, info.getHandback()))
{
iter.remove();
result = info;
break;
}
}
return (result);
}
}