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ActiveDispatcher.cpp

//
// ActiveDispatcher.cpp
//
// $Id: //poco/1.2/Foundation/src/ActiveDispatcher.cpp#1 $
//
// Library: Foundation
// Package: Threading
// Module:  ActiveObjects
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/ActiveDispatcher.h"
#include "Poco/Notification.h"
#include "Poco/AutoPtr.h"


namespace Poco {


namespace
{
      class MethodNotification: public Notification
      {
      public:
            MethodNotification(Runnable* pRunnable):
                  _pRunnable(pRunnable)
            {
            }
            
            Runnable* runnable() const
            {
                  return _pRunnable;
            }
            
      private:
            Runnable* _pRunnable;
      };
      
      class StopNotification: public Notification
      {
      };
}


ActiveDispatcher::ActiveDispatcher()
{
      _thread.start(*this);
}


00076 ActiveDispatcher::ActiveDispatcher(Thread::Priority prio)
{
      _thread.setPriority(prio);
      _thread.start(*this);
}


00083 ActiveDispatcher::~ActiveDispatcher()
{
      try
      {
            stop();
      }
      catch (...)
      {
      }
}


00095 void ActiveDispatcher::start(Runnable* pRunnable)
{
      poco_check_ptr (pRunnable);

      _queue.enqueueNotification(new MethodNotification(pRunnable));
}


00103 void ActiveDispatcher::cancel()
{
      _queue.clear();
}


00109 void ActiveDispatcher::run()
{
      AutoPtr<Notification> pNf = _queue.waitDequeueNotification();
      while (pNf && !dynamic_cast<StopNotification*>(pNf.get()))
      {
            MethodNotification* pMethodNf = dynamic_cast<MethodNotification*>(pNf.get());
            poco_check_ptr (pMethodNf);
            Runnable* pRunnable = pMethodNf->runnable();
            poco_check_ptr (pRunnable);
            pRunnable->run(); 
            pNf = _queue.waitDequeueNotification();
      }
}


void ActiveDispatcher::stop()
{
      _queue.clear();
      _queue.wakeUpAll();
      _queue.enqueueNotification(new StopNotification);
      _thread.join();
}


} // namespace Poco

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