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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 2018, 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 java.util.function.Consumer;
import java.util.function.Function;

import org.jboss.as.controller.capability.CapabilityServiceSupport;
import org.jboss.msc.Service;
import org.jboss.msc.service.ServiceBuilder;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;
import org.jboss.msc.service.ServiceTarget;
import org.wildfly.clustering.service.FunctionalService;
import org.wildfly.clustering.service.ServiceConfigurator;
import org.wildfly.clustering.service.SimpleServiceNameProvider;
import org.wildfly.clustering.service.SupplierDependency;
import org.wildfly.clustering.service.ServiceSupplierDependency;

/**
 * Similar to {@link org.wildfly.clustering.service.IdentityServiceConfigurator}, but resolves the {@link ServiceName} of the requirement during {@link #configure(CapabilityServiceSupport)}.
 * @author Paul Ferraro
 */
public class IdentityCapabilityServiceConfigurator extends SimpleServiceNameProvider implements CapabilityServiceConfigurator {

    private final Function requirementNameFactory;

    private volatile SupplierDependency requirement;

    public IdentityCapabilityServiceConfigurator(ServiceName name, ServiceNameFactory targetFactory) {
        this(name, new Function() {
            @Override
            public ServiceName apply(CapabilityServiceSupport support) {
                return targetFactory.getServiceName(support);
            }
        });
    }

    public IdentityCapabilityServiceConfigurator(ServiceName name, UnaryServiceNameFactory targetFactory, String requirementName) {
        this(name, new Function() {
            @Override
            public ServiceName apply(CapabilityServiceSupport support) {
                return targetFactory.getServiceName(support, requirementName);
            }
        });
    }

    public IdentityCapabilityServiceConfigurator(ServiceName name, BinaryServiceNameFactory targetFactory, String requirementParent, String requirementChild) {
        this(name, new Function() {
            @Override
            public ServiceName apply(CapabilityServiceSupport support) {
                return targetFactory.getServiceName(support, requirementParent, requirementChild);
            }
        });
    }

    private IdentityCapabilityServiceConfigurator(ServiceName name, Function requirementNameFactory) {
        super(name);
        this.requirementNameFactory = requirementNameFactory;
    }

    @Override
    public ServiceConfigurator configure(CapabilityServiceSupport support) {
        this.requirement = new ServiceSupplierDependency<>(this.requirementNameFactory.apply(support));
        return this;
    }

    @Override
    public ServiceBuilder build(ServiceTarget target) {
        ServiceBuilder builder = target.addService(this.getServiceName());
        Consumer consumer = this.requirement.register(builder).provides(this.getServiceName());
        Service service = new FunctionalService<>(consumer, Function.identity(), this.requirement);
        return builder.setInstance(service).setInitialMode(ServiceController.Mode.PASSIVE);
    }
}