slider-core/src/main/java/org/apache/slider/server/services/workflow/WorkflowRpcService.java

/*
 * 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 org.apache.slider.server.services.workflow;

import com.google.common.base.Preconditions;
import org.apache.hadoop.ipc.Server;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.service.AbstractService;

import java.net.InetSocketAddress;

/**
 * A YARN service that maps the start/stop lifecycle of an RPC server
 * to the YARN service lifecycle. 
 */
public class WorkflowRpcService extends AbstractService {

  /** RPC server*/
  private final Server server;

  /**
   * Construct an instance
   * @param name service name
   * @param server service to stop
   */
  public WorkflowRpcService(String name, Server server) {
    super(name);
    Preconditions.checkArgument(server != null, "Null server");
    this.server = server;
  }

  /**
   * Get the server
   * @return the server
   */
  public Server getServer() {
    return server;
  }

  /**
   * Get the socket address of this server
   * @return the address this server is listening on
   */
  public InetSocketAddress getConnectAddress() {
    return NetUtils.getConnectAddress(server);
  }

  @Override
  protected void serviceStart() throws Exception {
    super.serviceStart();
    server.start();
  }

  @Override
  protected void serviceStop() throws Exception {
    if (server != null) {
      server.stop();
    }
  }
}