/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014, 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.provider;

import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.wildfly.clustering.group.Group;
import org.wildfly.clustering.group.Node;
import org.wildfly.clustering.provider.ServiceProviderRegistration;
import org.wildfly.clustering.provider.ServiceProviderRegistration.Listener;
import org.wildfly.clustering.provider.ServiceProviderRegistry;

/**
 * Factory that provides a non-clustered {@link ServiceProviderRegistrationFactory} implementation.
 * @author Paul Ferraro
 */
public class LocalServiceProviderRegistry<T> implements ServiceProviderRegistry<T> {

    private final Set<T> services = ConcurrentHashMap.newKeySet();
    private final Group group;

    public LocalServiceProviderRegistry(Group group) {
        this.group = group;
    }

    @Override
    public Group getGroup() {
        return this.group;
    }

    @Override
    public ServiceProviderRegistration<T> register(T service) {
        this.services.add(service);
        return new SimpleServiceProviderRegistration<>(service, this, () -> this.services.remove(service));
    }

    @Override
    public ServiceProviderRegistration<T> register(T service, Listener listener) {
        return this.register(service);
    }

    @Override
    public Set<Node> getProviders(T service) {
        return this.services.contains(service) ? Collections.singleton(this.getGroup().getLocalNode()) : Collections.emptySet();
    }

    @Override
    public Set<T> getServices() {
        return Collections.unmodifiableSet(this.services);
    }
}