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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.catalina.util;
import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.apache.catalina.InstanceEvent;
import org.apache.catalina.InstanceListener;
import org.apache.catalina.Wrapper;
/**
* Support class to assist in firing InstanceEvent notifications to
* registered InstanceListeners.
*
* @author Craig R. McClanahan
*/
public final class InstanceSupport {
// ----------------------------------------------------------- Constructors
/**
* Construct a new InstanceSupport object associated with the specified
* Instance component.
*
* @param wrapper The component that will be the source
* of events that we fire
*/
public InstanceSupport(Wrapper wrapper) {
super();
this.wrapper = wrapper;
}
// ----------------------------------------------------- Instance Variables
/**
* The set of registered InstanceListeners for event notifications.
*/
private InstanceListener listeners[] = new InstanceListener[0];
private final Object listenersLock = new Object(); // Lock object for changes to listeners
/**
* The source component for instance events that we will fire.
*/
private Wrapper wrapper = null;
// ------------------------------------------------------------- Properties
/**
* Return the Wrapper with which we are associated.
*/
public Wrapper getWrapper() {
return (this.wrapper);
}
// --------------------------------------------------------- Public Methods
/**
* Add a lifecycle event listener to this component.
*
* @param listener The listener to add
*/
public void addInstanceListener(InstanceListener listener) {
synchronized (listenersLock) {
InstanceListener results[] =
new InstanceListener[listeners.length + 1];
for (int i = 0; i < listeners.length; i++)
results[i] = listeners[i];
results[listeners.length] = listener;
listeners = results;
}
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param filter The relevant Filter for this event
*/
public void fireInstanceEvent(String type, Filter filter) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, filter, type);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param filter The relevant Filter for this event
* @param exception Exception that occurred
*/
public void fireInstanceEvent(String type, Filter filter,
Throwable exception) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, filter, type,
exception);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param filter The relevant Filter for this event
* @param request The servlet request we are processing
* @param response The servlet response we are processing
*/
public void fireInstanceEvent(String type, Filter filter,
ServletRequest request,
ServletResponse response) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, filter, type,
request, response);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param filter The relevant Filter for this event
* @param request The servlet request we are processing
* @param response The servlet response we are processing
* @param exception Exception that occurred
*/
public void fireInstanceEvent(String type, Filter filter,
ServletRequest request,
ServletResponse response,
Throwable exception) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, filter, type,
request, response, exception);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param servlet The relevant Servlet for this event
*/
public void fireInstanceEvent(String type, Servlet servlet) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, servlet, type);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param servlet The relevant Servlet for this event
* @param exception Exception that occurred
*/
public void fireInstanceEvent(String type, Servlet servlet,
Throwable exception) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, servlet, type,
exception);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param servlet The relevant Servlet for this event
* @param request The servlet request we are processing
* @param response The servlet response we are processing
*/
public void fireInstanceEvent(String type, Servlet servlet,
ServletRequest request,
ServletResponse response) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, servlet, type,
request, response);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Notify all lifecycle event listeners that a particular event has
* occurred for this Container. The default implementation performs
* this notification synchronously using the calling thread.
*
* @param type Event type
* @param servlet The relevant Servlet for this event
* @param request The servlet request we are processing
* @param response The servlet response we are processing
* @param exception Exception that occurred
*/
public void fireInstanceEvent(String type, Servlet servlet,
ServletRequest request,
ServletResponse response,
Throwable exception) {
if (listeners.length == 0)
return;
InstanceEvent event = new InstanceEvent(wrapper, servlet, type,
request, response, exception);
InstanceListener interested[] = listeners;
for (int i = 0; i < interested.length; i++)
interested[i].instanceEvent(event);
}
/**
* Remove a lifecycle event listener from this component.
*
* @param listener The listener to remove
*/
public void removeInstanceListener(InstanceListener listener) {
synchronized (listenersLock) {
int n = -1;
for (int i = 0; i < listeners.length; i++) {
if (listeners[i] == listener) {
n = i;
break;
}
}
if (n < 0)
return;
InstanceListener results[] =
new InstanceListener[listeners.length - 1];
int j = 0;
for (int i = 0; i < listeners.length; i++) {
if (i != n)
results[j++] = listeners[i];
}
listeners = results;
}
}
}
