Java Code Examples for org.apache.curator.x.discovery.ServiceDiscovery#queryForNames()

The following examples show how to use org.apache.curator.x.discovery.ServiceDiscovery#queryForNames() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: DiscoveryExample.java From xian with Apache License 2.0

6 votes

private static void listInstances(ServiceDiscovery<InstanceDetails> serviceDiscovery) throws Exception
{
    // This shows how to query all the instances in group discovery

    try
    {
        Collection<String>  serviceNames = serviceDiscovery.queryForNames();
        System.out.println(serviceNames.size() + " type(s)");
        for ( String serviceName : serviceNames )
        {
            Collection<ServiceInstance<InstanceDetails>> instances = serviceDiscovery.queryForInstances(serviceName);
            System.out.println(serviceName);
            for ( ServiceInstance<InstanceDetails> instance : instances )
            {
                outputInstance(instance);
            }
        }
    }
    finally
    {
        CloseableUtils.closeQuietly(serviceDiscovery);
    }
}

Example 2

Source File: DiscoveryExample.java From curator with Apache License 2.0

6 votes

private static void listInstances(ServiceDiscovery<InstanceDetails> serviceDiscovery) throws Exception
{
    // This shows how to query all the instances in service discovery

    try
    {
        Collection<String>  serviceNames = serviceDiscovery.queryForNames();
        System.out.println(serviceNames.size() + " type(s)");
        for ( String serviceName : serviceNames )
        {
            Collection<ServiceInstance<InstanceDetails>> instances = serviceDiscovery.queryForInstances(serviceName);
            System.out.println(serviceName);
            for ( ServiceInstance<InstanceDetails> instance : instances )
            {
                outputInstance(instance);
            }
        }
    }
    finally
    {
        CloseableUtils.closeQuietly(serviceDiscovery);
    }
}

Example 3

Source File: DiscoveryExample.java From ZKRecipesByExample with Apache License 2.0

6 votes

private static void listInstances(ServiceDiscovery<InstanceDetails> serviceDiscovery) throws Exception {
	// This shows how to query all the instances in service discovery
	try {
		Collection<String> serviceNames = serviceDiscovery.queryForNames();
		System.out.println(serviceNames.size() + " type(s)");
		for (String serviceName : serviceNames) {
			Collection<ServiceInstance<InstanceDetails>> instances = serviceDiscovery.queryForInstances(serviceName);
			System.out.println(serviceName);
			for (ServiceInstance<InstanceDetails> instance : instances) {
				outputInstance(instance);
			}
		}
	} finally {
		CloseableUtils.closeQuietly(serviceDiscovery);
	}
}

Example 4

Source File: CuratorSchedulerTest.java From kylin-on-parquet-v2 with Apache License 2.0

4 votes

@Test
public void test() throws Exception {

    final String zkString = zkTestServer.getConnectString();

    ServiceDiscovery<LinkedHashMap> serviceDiscovery = null;
    CuratorFramework curatorClient = null;
    try {

        final CuratorScheduler.JsonInstanceSerializer<LinkedHashMap> serializer = new CuratorScheduler.JsonInstanceSerializer<>(
                LinkedHashMap.class);
        String servicePath = CuratorScheduler.KYLIN_SERVICE_PATH;
        curatorClient = ZKUtil.newZookeeperClient(zkString, new ExponentialBackoffRetry(3000, 3));
        serviceDiscovery = ServiceDiscoveryBuilder.builder(LinkedHashMap.class).client(curatorClient)
                .basePath(servicePath).serializer(serializer).build();
        serviceDiscovery.start();

        final ExampleServer server1 = new ExampleServer("localhost:1111");
        final ExampleServer server2 = new ExampleServer("localhost:2222");

        Collection<String> serviceNames = serviceDiscovery.queryForNames();
        Assert.assertTrue(serviceNames.size() == 1);
        Assert.assertTrue(CuratorScheduler.SERVICE_NAME.equals(serviceNames.iterator().next()));
        Collection<ServiceInstance<LinkedHashMap>> instances = serviceDiscovery
                .queryForInstances(CuratorScheduler.SERVICE_NAME);
        Assert.assertTrue(instances.size() == 2);
        List<ServiceInstance<LinkedHashMap>> instancesList = Lists.newArrayList(instances);

        final List<String> instanceNodes = Lists.transform(instancesList,
                new Function<ServiceInstance<LinkedHashMap>, String>() {

                    @Nullable
                    @Override
                    public String apply(@Nullable ServiceInstance<LinkedHashMap> stringServiceInstance) {
                        return (String) stringServiceInstance.getPayload()
                                .get(CuratorScheduler.SERVICE_PAYLOAD_DESCRIPTION);
                    }
                });

        Assert.assertTrue(instanceNodes.contains(server1.getAddress() + ":query"));
        Assert.assertTrue(instanceNodes.contains(server2.getAddress() + ":query"));

        // stop one server
        server1.close();
        instances = serviceDiscovery.queryForInstances(CuratorScheduler.SERVICE_NAME);
        Assert.assertTrue(instances.size() == 1);
        Assert.assertEquals(server2.getAddress() + ":query",
                instances.iterator().next().getPayload().get(CuratorScheduler.SERVICE_PAYLOAD_DESCRIPTION));

        // all stop
        server2.close();
        instances = serviceDiscovery.queryForInstances(CuratorScheduler.SERVICE_NAME);
        Assert.assertTrue(instances.size() == 0);

    } finally {
        CloseableUtils.closeQuietly(serviceDiscovery);
        CloseableUtils.closeQuietly(curatorClient);
    }

}

Example 5

Source File: KylinServerDiscoveryTest.java From kylin with Apache License 2.0

4 votes

@Test
public void test() throws Exception {

    final String zkString = zkTestServer.getConnectString();

    ServiceDiscovery<LinkedHashMap> serviceDiscovery = null;
    CuratorFramework curatorClient = null;
    try {
        String servicePath = KylinServerDiscovery.SERVICE_PATH;
        final KylinServerDiscovery.JsonInstanceSerializer<LinkedHashMap> serializer =
                new KylinServerDiscovery.JsonInstanceSerializer<>(LinkedHashMap.class);
        curatorClient = ZKUtil.newZookeeperClient(zkString, new ExponentialBackoffRetry(3000, 3));
        serviceDiscovery = ServiceDiscoveryBuilder.builder(LinkedHashMap.class).client(curatorClient)
                .basePath(servicePath).serializer(serializer).build();
        serviceDiscovery.start();

        final ExampleServer server1 = new ExampleServer("localhost:1111");
        final ExampleServer server2 = new ExampleServer("localhost:2222");

        Collection<String> serviceNames = serviceDiscovery.queryForNames();
        Assert.assertTrue(serviceNames.size() == 1);
        Assert.assertTrue(KylinServerDiscovery.SERVICE_NAME.equals(serviceNames.iterator().next()));
        Collection<ServiceInstance<LinkedHashMap>> instances = serviceDiscovery
                .queryForInstances(KylinServerDiscovery.SERVICE_NAME);
        Assert.assertTrue(instances.size() == 2);
        List<ServiceInstance<LinkedHashMap>> instancesList = Lists.newArrayList(instances);

        final List<String> instanceNodes = instancesList.stream()
                .map(input -> input.getAddress() + ":" + input.getPort() + ":"
                        + input.getPayload().get(KylinServerDiscovery.SERVICE_PAYLOAD_DESCRIPTION))
                .collect(Collectors.toList());

        Assert.assertTrue(instanceNodes.contains(server1.getAddress() + ":query"));
        Assert.assertTrue(instanceNodes.contains(server2.getAddress() + ":query"));

        // stop one server
        server1.close();
        instances = serviceDiscovery.queryForInstances(KylinServerDiscovery.SERVICE_NAME);
        ServiceInstance<LinkedHashMap> existingInstance = instances.iterator().next();
        Assert.assertTrue(instances.size() == 1);
        Assert.assertEquals(server2.getAddress() + ":query",
                existingInstance.getAddress() + ":" + existingInstance.getPort() + ":"
                        + existingInstance.getPayload().get(KylinServerDiscovery.SERVICE_PAYLOAD_DESCRIPTION));

        // all stop
        server2.close();
        instances = serviceDiscovery.queryForInstances(KylinServerDiscovery.SERVICE_NAME);
        Assert.assertTrue(instances.size() == 0);

    } finally {
        CloseableUtils.closeQuietly(serviceDiscovery);
        CloseableUtils.closeQuietly(curatorClient);
    }

}