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/*******************************************************************************
* Copyright (c) 2010-2016, Abel Hegedus, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.registry.impl;
import java.util.Collections;
import java.util.Set;
import java.util.WeakHashMap;
import tools.refinery.viatra.runtime.registry.IQuerySpecificationRegistryChangeListener;
import tools.refinery.viatra.runtime.registry.IQuerySpecificationRegistryEntry;
/**
* Listener implementation that propagates all changes to a set of listeners.
* The listeners are stored with weak references to avoid a need for disposal.
*
* @author Abel Hegedus
*
*/
public class RegistryChangeMultiplexer implements IQuerySpecificationRegistryChangeListener {
private Set<IQuerySpecificationRegistryChangeListener> listeners;
/**
* Creates a new instance of the multiplexer.
*/
public RegistryChangeMultiplexer() {
this.listeners = Collections.newSetFromMap(new WeakHashMap<IQuerySpecificationRegistryChangeListener, Boolean>());
}
/**
* Adds a weak reference on the listener to the multiplexer. The listener will receive all further notifications and
* does not have to be removed, since the multiplexer will not keep it in memory when it can be collected.
*/
public boolean addListener(IQuerySpecificationRegistryChangeListener listener) {
return listeners.add(listener);
}
@Override
public void entryAdded(IQuerySpecificationRegistryEntry entry) {
for (IQuerySpecificationRegistryChangeListener listener : listeners) {
listener.entryAdded(entry);
}
}
@Override
public void entryRemoved(IQuerySpecificationRegistryEntry entry) {
for (IQuerySpecificationRegistryChangeListener listener : listeners) {
listener.entryRemoved(entry);
}
}
}
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