Examples of org.wildfly.clustering.singleton.election.SimpleSingletonElectionPolicy

Package org.wildfly.clustering.singleton.election

Examples of org.wildfly.clustering.singleton.election.SimpleSingletonElectionPolicy

org.wildfly.clustering.singleton.election.SimpleSingletonElectionPolicy
A simple concrete policy service that decides which node in the cluster should be the master node to run certain HASingleton service based on attribute "Position". The value will be divided by partition size and only remainder will be used. Let's say partition size is n: 0 means the first oldest node. 1 means the 2nd oldest node. ... n-1 means the nth oldest node. -1 means the youngest node. -2 means the 2nd youngest node. ... -n means the nth youngest node. E.g. the following attribute says the singleton will be running on the 3rd oldest node of the current partition: 2 If no election policy is defined, the oldest node in the cluster runs the singleton. This behaivour can be achieved with this policy when "position" is set to 0. @author Alex Fu @author Galder Zamarreno @author Paul Ferraro

        InjectedValue<ServerEnvironment> env = new InjectedValue<>();
        HATimerService service = new HATimerService(env);
        ServiceController<?> factoryService = context.getServiceRegistry().getRequiredService(SingletonServiceBuilderFactory.SERVICE_NAME.append(CONTAINER_NAME, CACHE_NAME));
        SingletonServiceBuilderFactory factory = (SingletonServiceBuilderFactory) factoryService.getValue();
        factory.createSingletonServiceBuilder(name, service)
            .electionPolicy(new PreferredSingletonElectionPolicy(new SimpleSingletonElectionPolicy(), new NamePreference(PREFERRED_NODE + "/" + CONTAINER_NAME)))
            .requireQuorum(quorum)
            .build(context.getServiceTarget())
                .addDependency(ServerEnvironmentService.SERVICE_NAME, ServerEnvironment.class, env)
                .setInitialMode(ServiceController.Mode.ACTIVE)
                .install()

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        InjectedValue<ServerEnvironment> env = new InjectedValue<>();
        MyService service = new MyService(env);
        ServiceController<?> factoryService = context.getServiceRegistry().getRequiredService(SingletonServiceBuilderFactory.SERVICE_NAME.append(CONTAINER_NAME, CACHE_NAME));
        SingletonServiceBuilderFactory factory = (SingletonServiceBuilderFactory) factoryService.getValue();
        factory.createSingletonServiceBuilder(name, service)
            .electionPolicy(new PreferredSingletonElectionPolicy(new SimpleSingletonElectionPolicy(), new NamePreference(PREFERRED_NODE)))
            .requireQuorum(quorum)
            .build(context.getServiceTarget())
                .addDependency(ServerEnvironmentService.SERVICE_NAME, ServerEnvironment.class, env)
                .setInitialMode(ServiceController.Mode.ACTIVE)
                .install()

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        Node node1 = mock(Node.class);
        Node node2 = mock(Node.class);
        Node node3 = mock(Node.class);
        List<Node> nodes = Arrays.asList(node1, node2, node3);


        assertSame(node1, new SimpleSingletonElectionPolicy().elect(nodes));
        assertSame(node1, new SimpleSingletonElectionPolicy(0).elect(nodes));
        assertSame(node2, new SimpleSingletonElectionPolicy(1).elect(nodes));
        assertSame(node3, new SimpleSingletonElectionPolicy(2).elect(nodes));
        assertSame(node1, new SimpleSingletonElectionPolicy(3).elect(nodes));


        assertNull(new SimpleSingletonElectionPolicy().elect(Collections.<Node>emptyList()));
    }

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Related Classes of org.wildfly.clustering.singleton.election.SimpleSingletonElectionPolicy

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

org.jboss.as.test.clustering.cluster.singleton.service.MyServiceActivator

org.wildfly.clustering.server.singleton.election.SimpleSingletonElectionPolicyTestCase

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