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The code in this module is not explicitly related to clustering, but rather contains resuable code used by clustering modules and any modules that integrate with clustering.

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2019, 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.jboss.as.clustering.controller;

import org.jboss.msc.service.ServiceName;
import org.wildfly.common.function.ExceptionFunction;

/**
 * Executes a given function against the captured value of a service.
 * @author Paul Ferraro
 */
public class ServiceValueExecutor implements ServiceValueCaptor, FunctionExecutor {

    private final ServiceName name;

    private T value = null;

    public ServiceValueExecutor(ServiceName name) {
        this.name = name;
    }

    @Override
    public ServiceName getServiceName() {
        return this.name;
    }

    @Override
    public synchronized void accept(T value) {
        this.value = value;
    }

    @Override
    public synchronized  R execute(ExceptionFunction function) throws E {
        return (this.value != null) ? function.apply(this.value) : null;
    }
}