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TaskManager.h

//
// TaskManager.h
//
// $Id: //poco/1.3/Foundation/include/Poco/TaskManager.h#1 $
//
// Library: Foundation
// Package: Tasks
// Module:  Tasks
//
// Definition of the TaskManager class.
//
// Copyright (c) 2004-2006, 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.
//


#ifndef Foundation_TaskManager_INCLUDED
#define Foundation_TaskManager_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Mutex.h"
#include "Poco/Task.h"
#include "Poco/AutoPtr.h"
#include "Poco/NotificationCenter.h"
#include "Poco/Timestamp.h"
#include <list>


namespace Poco {


class Notification;
class ThreadPool;
class Exception;


00060 class Foundation_API TaskManager
      /// The TaskManager manages a collection of tasks
      /// and monitors their lifetime.
      ///
      /// A TaskManager has a built-in NotificationCenter that
      /// is used to send out notifications on task progress
      /// and task states. See the TaskNotification class and its
      /// subclasses for the various events that result in a notification.
      /// To keep the number of notifications small, a TaskProgressNotification
      /// will only be sent out once in 100 milliseconds.
{
public:
      typedef AutoPtr<Task>      TaskPtr;
      typedef std::list<TaskPtr> TaskList;

      TaskManager();
            /// Creates the TaskManager, using the
            /// default ThreadPool.

      TaskManager(ThreadPool& pool);
            /// Creates the TaskManager, using the
            /// given ThreadPool.

      ~TaskManager();
            /// Destroys the TaskManager.

      void start(Task* pTask);
            /// Starts the given task in a thread obtained
            /// from the thread pool.
            ///
            /// The TaskManager takes ownership of the Task object
            /// and deletes it when it it finished.

      void cancelAll();
            /// Requests cancellation of all tasks.
            
      void joinAll();
            /// Waits for the completion of all the threads
            /// in the TaskManager's thread pool.

      TaskList taskList() const;
            /// Returns a copy of the internal task list.

      int count() const;
            /// Returns the number of tasks in the internal task list.

      void addObserver(const AbstractObserver& observer);
            /// Registers an observer with the NotificationCenter.
            /// Usage:
            ///     Observer<MyClass, MyNotification> obs(*this, &MyClass::handleNotification);
            ///     notificationCenter.addObserver(obs);

      void removeObserver(const AbstractObserver& observer);
            /// Unregisters an observer with the NotificationCenter.

00115       static const int MIN_PROGRESS_NOTIFICATION_INTERVAL;

protected:
      void postNotification(Notification* pNf);
        /// Posts a notification to the task manager's 
        /// notification center.

      void taskStarted(Task* pTask);
      void taskProgress(Task* pTask, float progress);
      void taskCancelled(Task* pTask);
      void taskFinished(Task* pTask);
      void taskFailed(Task* pTask, const Exception& exc);

private:
      ThreadPool&        _threadPool;
      TaskList           _taskList;
      Timestamp          _lastProgressNotification;
      NotificationCenter _nc;
      mutable FastMutex  _mutex;

      friend class Task;
};


//
// inlines
//
00142 inline int TaskManager::count() const
{
      FastMutex::ScopedLock lock(_mutex);

      return (int) _taskList.size();
}


} // namespace Poco


#endif // Foundation_TaskManager_INCLUDED

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