content: /**
   * 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 com.alibaba.wasp.master;
  
  import com.alibaba.wasp.ipc.VersionedProtocol;
  import com.alibaba.wasp.protobuf.generated.MasterProtos.IsMasterRunningRequest;
  import com.alibaba.wasp.protobuf.generated.MasterProtos.IsMasterRunningResponse;
  import com.alibaba.wasp.protobuf.generated.MasterProtos.MasterService;
  import com.google.protobuf.RpcController;
  import com.google.protobuf.ServiceException;
  
  public interface MasterProtocol extends VersionedProtocol,
      MasterService.BlockingInterface {
  
    /**
     * @param c
     *          Unused (set to null).
     * @param req
     *          IsMasterRunningRequest
     * @return IsMasterRunningRequest that contains:<br>
     *         isMasterRunning: true if master is available
     * @throws com.google.protobuf.ServiceException
     */
    public IsMasterRunningResponse isMasterRunning(RpcController c,
                                                   IsMasterRunningRequest req) throws ServiceException;
  }
  