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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.aries.blueprint.container;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
import org.apache.aries.blueprint.ExtendedBlueprintContainer;
import org.apache.aries.blueprint.utils.ReflectionUtils;
import org.osgi.service.blueprint.container.ComponentDefinitionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ServiceListener {
private static final Logger LOGGER = LoggerFactory.getLogger(ServiceListener.class);
private Object listener;
private String registerMethod;
private String unregisterMethod;
private ExtendedBlueprintContainer blueprintContainer;
private List<Method> registerMethods;
private List<Method> unregisterMethods;
private boolean initialized = false;
public void setListener(Object listener) {
this.listener = listener;
}
public void setRegisterMethod(String method) {
this.registerMethod = method;
}
public void setUnregisterMethod(String method) {
this.unregisterMethod = method;
}
public void setBlueprintContainer(ExtendedBlueprintContainer blueprintContainer) {
this.blueprintContainer = blueprintContainer;
}
public void register(Object service, Map properties) {
init(service);
invokeMethod(registerMethods, service, properties);
}
public void unregister(Object service, Map properties) {
init(service);
invokeMethod(unregisterMethods, service, properties);
}
private synchronized void init(Object service) {
if (initialized) {
return;
}
Class[] paramTypes = new Class[] { service != null ? service.getClass() : null, Map.class };
Class listenerClass = listener.getClass();
if (registerMethod != null) {
registerMethods = ReflectionUtils.findCompatibleMethods(listenerClass, registerMethod, paramTypes);
if (registerMethods.size() == 0) {
throw new ComponentDefinitionException("No matching methods found for listener registration method: " + registerMethod);
}
LOGGER.debug("Found register methods: {}", registerMethods);
}
if (unregisterMethod != null) {
unregisterMethods = ReflectionUtils.findCompatibleMethods(listenerClass, unregisterMethod, paramTypes);
if (unregisterMethods.size() == 0) {
throw new ComponentDefinitionException("No matching methods found for listener unregistration method: " + unregisterMethod);
}
LOGGER.debug("Found unregister methods: {}", unregisterMethods);
}
initialized = true;
}
private void invokeMethod(List<Method> methods, Object service, Map properties) {
if (methods == null || methods.isEmpty()) {
return;
}
for (Method method : methods) {
try {
ReflectionUtils.invoke(blueprintContainer.getAccessControlContext(),
method, listener, service, properties);
} catch (Exception e) {
LOGGER.error("Error calling listener method " + method, e);
}
}
}
}