Simplify HATimerService installation using a ServiceActivator.

cluster-ha-singleton/service/src/main/java/org/jboss/as/quickstarts/cluster/hasingleton/service/ejb/HATimerServiceActivator.java

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+/*
+ * JBoss, Home of Professional Open Source
+ * Copyright 2012, Red Hat, Inc. and/or its affiliates, and individual
+ * contributors by the @authors tag. See the copyright.txt in the 
+ * distribution for a full listing of 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.jboss.as.quickstarts.cluster.hasingleton.service.ejb;
+
+import org.jboss.as.clustering.singleton.SingletonService;
+import org.jboss.as.server.ServerEnvironment;
+import org.jboss.as.server.ServerEnvironmentService;
+import org.jboss.logging.Logger;
+import org.jboss.msc.service.DelegatingServiceContainer;
+import org.jboss.msc.service.ServiceActivator;
+import org.jboss.msc.service.ServiceActivatorContext;
+import org.jboss.msc.service.ServiceController;
+
+/**
+ * Service activator that installs the HATimerService as a clustered singleton service
+ * during deployment.
+ * @author Paul Ferraro
+ */
+public class HATimerServiceActivator implements ServiceActivator {
+    private final Logger log = Logger.getLogger(this.getClass());
+
+    @Override
+    public void activate(ServiceActivatorContext context) {
+        log.info("HATimerService will be installed!");
+
+        HATimerService service = new HATimerService();
+        SingletonService<String> singleton = new SingletonService<String>(service, HATimerService.SINGLETON_SERVICE_NAME);
+        /*
+         * We can pass a chain of election policies to the singleton, for example to tell JGroups to prefer running the singleton on a node with a
+         * particular name
+         */
+        // singleton.setElectionPolicy(new PreferredSingletonElectionPolicy(new SimpleSingletonElectionPolicy(), new NamePreference("node2/cluster")));
+
+        // Workaround for JBoss AS 7.1.2
+        // In later releases, SingleService.build(...) accepts a service target
+        singleton.build(new DelegatingServiceContainer(context.getServiceTarget(), context.getServiceRegistry()))
+        // singleton.build(context.getServiceTarget())
+                .addDependency(ServerEnvironmentService.SERVICE_NAME, ServerEnvironment.class, service.env)
+                .setInitialMode(ServiceController.Mode.ACTIVE)
+                .install()
+        ;
+    }
+}

cluster-ha-singleton/service/src/main/resources/META-INF/services/org.jboss.msc.service.ServiceActivator

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+org.jboss.as.quickstarts.cluster.hasingleton.service.ejb.HATimerServiceActivator