📄 instancesupport.java
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/*
* $Header: /home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/util/InstanceSupport.java,v 1.1.1.1 2002/07/18 16:47:45 remm Exp $
* $Revision: 1.1.1.1 $
* $Date: 2002/07/18 16:47:45 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* [Additional notices, if required by prior licensing conditions]
*
*/
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
* @version $Id: InstanceSupport.java,v 1.1.1.1 2002/07/18 16:47:45 remm Exp $
*/
public final class InstanceSupport {
// ----------------------------------------------------------- Constructors
/**
* Construct a new InstanceSupport object associated with the specified
* Instance component.
*
* @param lifecycle The Instance 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];
/**
* 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 (listeners) {
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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[] = null;
synchronized (listeners) {
interested = (InstanceListener[]) listeners.clone();
}
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 (listeners) {
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;
}
}
}
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