////////////////////////////////////////////////////////////////////////////////
/// @brief tasks used to handle signals
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2014 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
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2008-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#ifndef ARANGODB_SCHEDULER_SIGNAL_TASK_H
#define ARANGODB_SCHEDULER_SIGNAL_TASK_H 1

#include "Basics/Common.h"

#include "Scheduler/Task.h"

#include "Basics/Mutex.h"

namespace triagens {
  namespace rest {

////////////////////////////////////////////////////////////////////////////////
/// @ingroup Scheduler
/// @brief task used to handle signals
////////////////////////////////////////////////////////////////////////////////

    class  SignalTask : virtual public Task {
      public:

////////////////////////////////////////////////////////////////////////////////
/// @brief maximal number of signals per task
////////////////////////////////////////////////////////////////////////////////

        static size_t const MAX_SIGNALS = 10;

      public:

////////////////////////////////////////////////////////////////////////////////
/// @brief constructs a new task
////////////////////////////////////////////////////////////////////////////////

        SignalTask ();

      public:

////////////////////////////////////////////////////////////////////////////////
/// @brief adds a signal which will be handled
///
/// Note that this method can be called on a signal task, which has already
/// been set up.
////////////////////////////////////////////////////////////////////////////////

        bool addSignal (int signal);

      protected:

////////////////////////////////////////////////////////////////////////////////
/// @brief called when the signal is received
////////////////////////////////////////////////////////////////////////////////

        virtual bool handleSignal () = 0;

      protected:

////////////////////////////////////////////////////////////////////////////////
/// destructor
////////////////////////////////////////////////////////////////////////////////

        ~SignalTask ();

      protected:

////////////////////////////////////////////////////////////////////////////////
/// {@inheritDoc}
////////////////////////////////////////////////////////////////////////////////

        bool setup (Scheduler*, EventLoop);

////////////////////////////////////////////////////////////////////////////////
/// {@inheritDoc}
////////////////////////////////////////////////////////////////////////////////

        void cleanup ();

////////////////////////////////////////////////////////////////////////////////
/// {@inheritDoc}
////////////////////////////////////////////////////////////////////////////////

        bool handleEvent (EventToken, EventType);

////////////////////////////////////////////////////////////////////////////////
/// {@inheritDoc}
////////////////////////////////////////////////////////////////////////////////

        bool needsMainEventLoop () const;

      protected:

////////////////////////////////////////////////////////////////////////////////
/// @brief signal event
////////////////////////////////////////////////////////////////////////////////

        EventToken watcher[MAX_SIGNALS];

      private:
        std::set<int> signals;
        basics::Mutex changeLock;
    };
  }
}

#endif
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