////////////////////////////////////////////////////////////////////////////////
/// @brief tasks used to handle asynchronous events
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2010-2011 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 triAGENS GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Achim Brandt
/// @author Copyright 2008-2011, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#include "AsyncTask.h"

#include "Scheduler/Scheduler.h"

using namespace triagens::rest;

namespace triagens {
  namespace rest {

    // -----------------------------------------------------------------------------
    // constructors and destructors
    // -----------------------------------------------------------------------------

    AsyncTask::AsyncTask ()
      : Task("AsyncTask"),
        watcher(0) {
    }



    AsyncTask::~AsyncTask () {
    }

    // -----------------------------------------------------------------------------
    // public methods
    // -----------------------------------------------------------------------------

    void AsyncTask::signal () {
      scheduler->sendAsync(watcher);
    }

    // -----------------------------------------------------------------------------
    // Task methods
    // -----------------------------------------------------------------------------

    void AsyncTask::setup (Scheduler* scheduler, EventLoop loop) {
      this->scheduler = scheduler;
      this->loop = loop;

      watcher = scheduler->installAsyncEvent(loop, this);
    }



    void AsyncTask::cleanup () {
      scheduler->uninstallEvent(watcher);
      watcher = 0;
    }



    bool AsyncTask::handleEvent (EventToken token, EventType revents) {
      bool result = true;

      if (watcher == token && (revents & EVENT_ASYNC)) {
        result = handleAsync();
      }

      return result;
    }
  }
}