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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.tuscany.sca.endpoint.tribes;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* The Map that can fire events on put/remove of entries
*/
public abstract class MapStore extends ConcurrentHashMap<Object, Object> {
private static final long serialVersionUID = -2127235547082144368L;
private List<MapListener> listeners = new CopyOnWriteArrayList<MapListener>();
protected MapStore(int initialCapacity, float loadFactor, int concurrencyLevel) {
super(initialCapacity, loadFactor, concurrencyLevel);
}
@Override
public Object put(Object key, Object value) {
Object old = super.put(key, value);
if (old != null) {
for (MapListener listener : listeners) {
listener.entryUpdated(key, old, value);
}
} else {
for (MapListener listener : listeners) {
listener.entryAdded(key, value);
}
}
return old;
}
@Override
public Object remove(Object key) {
Object old = super.remove(key);
if (old != null) {
for (MapListener listener : listeners) {
listener.entryRemoved(key, old);
}
}
return old;
}
public void addListener(MapListener listener) {
listeners.add(listener);
}
public List<MapListener> getListeners() {
return listeners;
}
public boolean removeListener(MapListener listener) {
return listeners.remove(listener);
}
public static interface MapListener {
void entryAdded(Object key, Object value);
void entryUpdated(Object key, Object oldValue, Object newValue);
void entryRemoved(Object key, Object value);
}
}
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