ConsulTopologyConnector.java

/**
 * Copyright 2015-2016 Red Hat, Inc, and individual contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.wildfly.swarm.topology.consul.runtime;

import com.orbitz.consul.CatalogClient;
import com.orbitz.consul.HealthClient;
import org.jboss.as.network.SocketBinding;
import org.jboss.msc.inject.Injector;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.ServiceTarget;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
import org.jboss.msc.value.InjectedValue;
import org.wildfly.swarm.topology.TopologyConnector;
import org.wildfly.swarm.topology.runtime.TopologyManager;
import org.wildfly.swarm.topology.runtime.Registration;
import org.wildfly.swarm.topology.runtime.TopologyManagerActivator;

/**
 * Topology connector for Consul.
 *
 * This topology connector knows how to interact with a Consul catalog to
 * provide topology information to other systems, such as the Topology Web-App
 * and Ribbon.
 *
 * @author John Hovell
 * @author Bob McWhirter
 */
public class ConsulTopologyConnector implements Service<ConsulTopologyConnector>, TopologyConnector {

    public ConsulTopologyConnector() {

    }

    public Injector<TopologyManager> getTopologyManagerInjector() {
        return this.topologyManagerInjector;
    }

    public Injector<Advertiser> getAdvertiserInjector() {
        return this.advertiser;
    }

    @Override
    public void advertise(String name, SocketBinding binding, String... tags) {
        Registration registration = new Registration("consul", name, binding.getAddress().getHostAddress(), binding.getAbsolutePort(), tags);
        getAdvertiser().advertise(registration);
    }

    private Advertiser getAdvertiser() {
        return this.advertiser.getValue();
    }

    @Override
    public void unadvertise(String name, SocketBinding binding) {
        getAdvertiser().unadvertise(name, binding.getAddress().getHostAddress(), binding.getAbsolutePort());
    }

    @Override
    public void start(StartContext startContext) throws StartException {
        ServiceTarget target = startContext.getChildTarget();

        CatalogWatcher watcher = new CatalogWatcher();
        target.addService(CatalogWatcher.SERVICE_NAME, watcher)
                .addDependency(CatalogClientService.SERVICE_NAME, CatalogClient.class, watcher.getCatalogClientInjector())
                .addDependency(HealthClientService.SERIVCE_NAME, HealthClient.class, watcher.getHealthClientInjector())
                .addDependency(TopologyManagerActivator.SERVICE_NAME, TopologyManager.class, watcher.getTopologyManagerInjector())
                .install();


    }

    @Override
    public void stop(StopContext stopContext) {
        // all sub-services will be stopped prior.
        System.out.println(">>");
    }

    @Override
    public ConsulTopologyConnector getValue() throws IllegalStateException, IllegalArgumentException {
        return this;
    }

    private InjectedValue<TopologyManager> topologyManagerInjector = new InjectedValue<>();

    private InjectedValue<Advertiser> advertiser = new InjectedValue<>();
}