/*
* 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.felix.ipojo.handler.extender;
import java.lang.reflect.InvocationTargetException;
import java.util.Dictionary;
import java.util.HashSet;
import java.util.Set;
import org.apache.felix.ipojo.PrimitiveHandler;
import org.apache.felix.ipojo.util.Callback;
import org.osgi.framework.Bundle;
/**
* Track and manage extensions.
* @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
*/
public class ExtenderManager extends BundleTracker {
/**
* Looked extension.
*/
private String m_extension;
/**
* OnArrival method.
*/
private Callback m_onArrival;
/**
* OnDeparture method.
*/
private Callback m_onDeparture;
/**
* Attached handler.
*/
private PrimitiveHandler m_handler;
/**
* Set of managed bundles.
*/
private Set m_bundles = new HashSet();
/**
* Constructor.
* @param handler the attached handler.
* @param extension the looked extension.
* @param bind the onArrival method
* @param unbind the onDeparture method.
*/
public ExtenderManager(ExtenderModelHandler handler, String extension, String bind, String unbind) {
super(handler.getInstanceManager().getContext());
m_handler = handler;
m_onArrival = new Callback(bind, new Class[] {Bundle.class, String.class}, false, m_handler.getInstanceManager());
m_onDeparture = new Callback(unbind, new Class[] {Bundle.class}, false, m_handler.getInstanceManager());
m_extension = extension;
}
/**
* A bundle arrives.
* Checks if the bundle match with the looked extension, if so call the arrival callback.
* @param bundle the arriving bundle.
* @see org.apache.felix.ipojo.handler.extender.BundleTracker#addedBundle(org.osgi.framework.Bundle)
*/
protected void addedBundle(Bundle bundle) {
Dictionary headers = bundle.getHeaders();
String header = (String) headers.get(m_extension);
if (header != null) {
synchronized (this) {
m_bundles.add(bundle);
}
try { // Call the callback outside the synchronized block.
m_onArrival.call(new Object[] {bundle, header});
} catch (NoSuchMethodException e) {
m_handler.error("The onArrival method " + m_onArrival.getMethod() + " does not exist in the class", e);
m_handler.getInstanceManager().stop();
} catch (IllegalAccessException e) {
m_handler.error("The onArrival method " + m_onArrival.getMethod() + " cannot be called", e);
m_handler.getInstanceManager().stop();
} catch (InvocationTargetException e) {
m_handler.error("The onArrival method " + m_onArrival.getMethod() + " has thrown an exception", e.getTargetException());
m_handler.getInstanceManager().stop();
}
}
}
/**
* A bundle is stopping.
* Check if the bundle was managed, if so call the remove departure callback.
* @param bundle the leaving bundle.
* @see org.apache.felix.ipojo.handler.extender.BundleTracker#removedBundle(org.osgi.framework.Bundle)
*/
protected void removedBundle(Bundle bundle) {
boolean contained;
synchronized (this) {
contained = m_bundles.remove(bundle); // Stack confinement
}
if (contained) {
try {
m_onDeparture.call(new Object[] {bundle});
} catch (NoSuchMethodException e) {
m_handler.error("The onDeparture method " + m_onDeparture.getMethod() + " does not exist in the class", e);
m_handler.getInstanceManager().stop();
} catch (IllegalAccessException e) {
m_handler.error("The onDeparture method " + m_onDeparture.getMethod() + " cannot be called", e);
m_handler.getInstanceManager().stop();
} catch (InvocationTargetException e) {
m_handler.error("The onDeparture method " + m_onDeparture.getMethod() + " has thrown an exception", e.getTargetException());
m_handler.getInstanceManager().stop();
}
}
}
}