/*
* JBoss, Home of Professional Open Source.
* Copyright 2016, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.wildfly.clustering.server.registry;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiFunction;
import org.wildfly.clustering.registry.Registry;
import org.wildfly.clustering.registry.RegistryFactory;
/**
* @author Paul Ferraro
*/
public class FunctionalRegistryFactory<K, V> implements RegistryFactory<K, V> {
private final AtomicReference<Map.Entry<K, V>> entry = new AtomicReference<>();
private final BiFunction<Map.Entry<K, V>, Runnable, Registry<K, V>> factory;
public FunctionalRegistryFactory(BiFunction<Map.Entry<K, V>, Runnable, Registry<K, V>> factory) {
this.factory = factory;
}
@Override
public Registry<K, V> createRegistry(Map.Entry<K, V> entry) {
// Ensure only one registry is created at a time
if (!this.entry.compareAndSet(null, entry)) {
throw new IllegalStateException();
}
return this.factory.apply(entry, () -> this.entry.set(null));
}
}