text: // 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.
  
  #ifndef __MASTER_CONTENDER_ZOOKEEPER_HPP__
  #define __MASTER_CONTENDER_ZOOKEEPER_HPP__
  
  #include <mesos/mesos.hpp>
  
  #include <mesos/master/contender.hpp>
  
  #include <mesos/zookeeper/group.hpp>
  #include <mesos/zookeeper/url.hpp>
  
  #include <process/future.hpp>
  #include <process/owned.hpp>
  
  #include <stout/nothing.hpp>
  
  namespace mesos {
  namespace master {
  namespace contender {
  
  extern const Duration MASTER_CONTENDER_ZK_SESSION_TIMEOUT;
  
  
  class ZooKeeperMasterContenderProcess;
  
  
  class ZooKeeperMasterContender : public MasterContender
  {
  public:
    // Creates a contender that uses ZooKeeper to determine (i.e.,
    // elect) a leading master.
    explicit ZooKeeperMasterContender(
        const zookeeper::URL& url,
        const Duration& sessionTimeout = MASTER_CONTENDER_ZK_SESSION_TIMEOUT);
  
    explicit ZooKeeperMasterContender(process::Owned<zookeeper::Group> group);
  
    virtual ~ZooKeeperMasterContender();
  
    // MasterContender implementation.
    virtual void initialize(const MasterInfo& masterInfo);
    virtual process::Future<process::Future<Nothing>> contend();
  
  private:
    ZooKeeperMasterContenderProcess* process;
  };
  
  } // namespace contender {
  } // namespace master {
  } // namespace mesos {
  
  #endif // __MASTER_CONTENDER_ZOOKEEPER_HPP__
  