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/*
* Copyright 2015 Open Networking Laboratory
*
* Licensed 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.onosproject.event;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
/**
* Basis for components which need to export listener mechanism.
*/
@Component(componentAbstract = true)
public abstract class AbstractListenerManager<E extends Event, L extends EventListener<E>>
implements ListenerService<E, L> {
protected final ListenerRegistry<E, L> listenerRegistry = new ListenerRegistry<>();
@Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
protected EventDeliveryService eventDispatcher;
@Override
public void addListener(L listener) {
listenerRegistry.addListener(listener);
}
@Override
public void removeListener(L listener) {
listenerRegistry.removeListener(listener);
}
/**
* Safely posts the specified event to the local event dispatcher.
* If there is no event dispatcher or if the event is null, this method
* is a noop.
*
* @param event event to be posted; may be null
*/
protected void post(E event) {
if (event != null && eventDispatcher != null) {
eventDispatcher.post(event);
}
}
}
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