/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 discovery;
import com.google.common.io.Closeables;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.x.discovery.ServiceDiscovery;
import org.apache.curator.x.discovery.ServiceDiscoveryBuilder;
import org.apache.curator.x.discovery.ServiceInstance;
import org.apache.curator.x.discovery.UriSpec;
import org.apache.curator.x.discovery.details.JsonInstanceSerializer;
import java.io.Closeable;
import java.io.IOException;
/**
* This shows a very simplified method of registering an instance with the service discovery. Each individual
* instance in your distributed set of applications would create an instance of something similar to ExampleServer,
* start it when the application comes up and close it when the application shuts down.
*/
public class ExampleServer implements Closeable
{
private final ServiceDiscovery<InstanceDetails> serviceDiscovery;
private final ServiceInstance<InstanceDetails> thisInstance;
public ExampleServer(CuratorFramework client, String path, String serviceName, String description) throws Exception
{
// in a real application, you'd have a convention of some kind for the URI layout
UriSpec uriSpec = new UriSpec("{scheme}://foo.com:{port}");
thisInstance = ServiceInstance.<InstanceDetails>builder()
.name(serviceName)
.payload(new InstanceDetails(description))
.port((int)(65535 * Math.random())) // in a real application, you'd use a common port
.uriSpec(uriSpec)
.build();
// if you mark your payload class with @JsonRootName the provided JsonInstanceSerializer will work
JsonInstanceSerializer<InstanceDetails> serializer = new JsonInstanceSerializer<InstanceDetails>(InstanceDetails.class);
serviceDiscovery = ServiceDiscoveryBuilder.builder(InstanceDetails.class)
.client(client)
.basePath(path)
.serializer(serializer)
.thisInstance(thisInstance)
.build();
}
public ServiceInstance<InstanceDetails> getThisInstance()
{
return thisInstance;
}
public void start() throws Exception
{
serviceDiscovery.start();
}
@Override
public void close() throws IOException
{
Closeables.closeQuietly(serviceDiscovery);
}
}