/* | |
* 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.wbp; | |
import java.lang.reflect.InvocationTargetException; | |
import org.apache.felix.ipojo.PrimitiveHandler; | |
import org.apache.felix.ipojo.util.Callback; | |
import org.apache.felix.ipojo.util.Tracker; | |
import org.apache.felix.ipojo.util.TrackerCustomizer; | |
import org.osgi.framework.Filter; | |
import org.osgi.framework.ServiceReference; | |
/** | |
* Manage a white board pattern. | |
* @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> | |
*/ | |
public class WhiteBoardManager implements TrackerCustomizer { | |
/** | |
* monitored filter. | |
*/ | |
private Filter m_filter; | |
/** | |
* onArrival method. | |
*/ | |
private Callback m_onArrival; | |
/** | |
* onDeparture method. | |
*/ | |
private Callback m_onDeparture; | |
/** | |
* onModify method. | |
*/ | |
private Callback m_onModification; | |
/** | |
* Service Tracker. | |
*/ | |
private Tracker m_tracker; | |
/** | |
* Attached handler. | |
*/ | |
private PrimitiveHandler m_handler; | |
/** | |
* Constructor. | |
* @param handler : attached handler | |
* @param filter : monitored filter | |
* @param bind : onArrival method | |
* @param unbind : onDeparture method | |
* @param modification : onModify method | |
*/ | |
public WhiteBoardManager(WhiteBoardPatternHandler handler, Filter filter, String bind, String unbind, String modification) { | |
m_handler = handler; | |
m_onArrival = new Callback(bind, new Class[] {ServiceReference.class}, false, m_handler.getInstanceManager()); | |
m_onDeparture = new Callback(unbind, new Class[] {ServiceReference.class}, false, m_handler.getInstanceManager()); | |
if (modification != null) { | |
m_onModification = new Callback(modification, new Class[] {ServiceReference.class}, false, m_handler.getInstanceManager()); | |
} | |
m_filter = filter; | |
m_tracker = new Tracker(handler.getInstanceManager().getContext(), m_filter, this); | |
} | |
/** | |
* Open the tracker. | |
*/ | |
public void start() { | |
m_tracker.open(); | |
} | |
/** | |
* Close the tracker. | |
*/ | |
public void stop() { | |
m_tracker.close(); | |
} | |
/** | |
* A new service was added to the tracker. | |
* @param arg0 : service reference. | |
* @see org.apache.felix.ipojo.util.TrackerCustomizer#addedService(org.osgi.framework.ServiceReference) | |
*/ | |
public void addedService(ServiceReference arg0) { | |
try { | |
m_onArrival.call(new Object[] {arg0}); | |
} 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 invoked", 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 new service is detected. | |
* @param arg0 : service reference | |
* @return true to add the service | |
* @see org.apache.felix.ipojo.util.TrackerCustomizer#addingService(org.osgi.framework.ServiceReference) | |
*/ | |
public boolean addingService(ServiceReference arg0) { | |
return true; | |
} | |
/** | |
* An existing service was modified. | |
* @param arg0 : service reference | |
* @param arg1 : service object (if already get) | |
* @see org.apache.felix.ipojo.util.TrackerCustomizer#modifiedService(org.osgi.framework.ServiceReference, java.lang.Object) | |
*/ | |
public void modifiedService(ServiceReference arg0, Object arg1) { | |
if (m_onModification != null) { | |
try { | |
m_onModification.call(new Object[] {arg0}); | |
} catch (NoSuchMethodException e) { | |
m_handler.error("The onModification method " + m_onModification.getMethod() + " does not exist in the class", e); | |
m_handler.getInstanceManager().stop(); | |
} catch (IllegalAccessException e) { | |
m_handler.error("The onModification method " + m_onModification.getMethod() + " cannot be invoked", e); | |
m_handler.getInstanceManager().stop(); | |
} catch (InvocationTargetException e) { | |
m_handler.error("The onModification method " + m_onModification.getMethod() + " has thrown an exception", e.getTargetException()); | |
m_handler.getInstanceManager().stop(); | |
} | |
} | |
} | |
/** | |
* A service disappears. | |
* @param arg0 : service reference | |
* @param arg1 : service object (if already get) | |
* @see org.apache.felix.ipojo.util.TrackerCustomizer#removedService(org.osgi.framework.ServiceReference, java.lang.Object) | |
*/ | |
public void removedService(ServiceReference arg0, Object arg1) { | |
try { | |
m_onDeparture.call(new Object[] {arg0}); | |
} 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 invoked", 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(); | |
} | |
} | |
} |