text: ////////////////////////////////////////////////////////////////////////////////
  /// DISCLAIMER
  ///
  /// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
  /// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
  ///
  /// Licensed 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.
  ///
  /// Copyright holder is ArangoDB GmbH, Cologne, Germany
  ///
  /// @author Dr. Frank Celler
  /// @author Achim Brandt
  ////////////////////////////////////////////////////////////////////////////////
  
  #ifndef ARANGOD_SCHEDULER_TIMER_TASK_H
  #define ARANGOD_SCHEDULER_TIMER_TASK_H 1
  
  #include "Basics/Common.h"
  #include "Scheduler/Task.h"
  
  namespace arangodb {
  namespace velocypack {
  class Builder;
  }
  
  namespace rest {
  
  ////////////////////////////////////////////////////////////////////////////////
  /// @ingroup Scheduler
  /// @brief task used to handle timer events
  ////////////////////////////////////////////////////////////////////////////////
  
  class TimerTask : virtual public Task {
   public:
    //////////////////////////////////////////////////////////////////////////////
    /// @brief constructs a new task for a timer event
    //////////////////////////////////////////////////////////////////////////////
  
    TimerTask(std::string const&, double);
  
    //////////////////////////////////////////////////////////////////////////////
    /// @brief get a task specific description in VelocyPack format
    //////////////////////////////////////////////////////////////////////////////
  
    virtual void getDescription(arangodb::velocypack::Builder&) const override;
  
   protected:
    //////////////////////////////////////////////////////////////////////////////
    /// @brief called when the timer is reached
    //////////////////////////////////////////////////////////////////////////////
  
    virtual bool handleTimeout() = 0;
  
   protected:
    ~TimerTask();
  
   protected:
    bool setup(Scheduler*, EventLoop) override;
  
    void cleanup() override;
  
    bool handleEvent(EventToken token, EventType event) override;
  
   protected:
    //////////////////////////////////////////////////////////////////////////////
    /// @brief timer event
    //////////////////////////////////////////////////////////////////////////////
  
    EventToken _watcher;
  
    //////////////////////////////////////////////////////////////////////////////
    /// @brief timeout
    //////////////////////////////////////////////////////////////////////////////
  
    double _seconds;
  };
  }
  }
  
  #endif
  