author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 08:45:44 +0200 | |
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/* |
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* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: Task manager for multiple tasks. Allows asynchronosity and |
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* tracking/callback for long running tasks. |
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* |
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*/ |
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/** |
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* @internal reviewed 30/07/2007 by Simon Brooks |
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*/ |
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#ifndef C_GLXTNTASKMANAGER_H |
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#define C_GLXTNTASKMANAGER_H |
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#include "glxtnstd.h" |
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#include <glxmediaid.h> |
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#include <e32base.h> |
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// Forward declarations |
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class CGlxtnTask; |
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class MGlxtnThumbnailStorage; |
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/** |
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* Active object which maintains a priority queue of long running tasks, and |
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* provides callback upon task completion or error. |
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* |
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* The highest priority task in the queue which has @ref CGlxtnTask::TState "state" |
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* EStarting is started and the task manager's RunL then delegates to the task's |
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* RunL until the task is complete, or is cancelled. The task is then deleted |
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* and another task is started, if any are ready to start. |
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* |
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* The task manager's DoCancel and RunError methods also delegate to the current |
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* task, if any. |
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* |
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* @ingroup glx_thumbnail_creator |
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*/ |
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NONSHARABLE_CLASS(CGlxtnTaskManager) : public CActive |
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{ |
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public: |
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enum TExecutionOrder |
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{ |
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ELastOut, // Old tasks with the same priority get executed before the new task |
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EFirstOut // New task gets executed before other tasks with the same priority |
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}; |
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public: |
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/** |
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* Static constructor. |
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*/ |
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static CGlxtnTaskManager* NewL(); |
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/** |
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* Destructor. |
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*/ |
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~CGlxtnTaskManager(); |
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public: |
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/** |
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* @returns CVieTask task at an index |
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*/ |
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inline CGlxtnTask* Task(TInt aIndex) const { return iTasks[aIndex]; }; |
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/** |
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* Returns the highest priority task with the id. |
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* If there are multiple tasks with same id and priority, |
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* returns the one of those that will be executed first |
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*/ |
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CGlxtnTask* Task(const TGlxtnTaskId& aId) const; |
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/** |
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* Adds a task to the task list. If no task is currently running, the task |
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* is started. |
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* |
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* @param aTask Task to add. Takes ownership, task is deleted if a leave occurs. |
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* |
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* @param aExecutionOrder -if ELastOut, the tast gets added to the bottom |
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* of the queue of the tasks with the same priority |
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* as the new tasks. This means that the task is |
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* executed after the previously added tasks (with |
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* same priority) have been run. |
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* -if EFirstOut, the task gets added to the top, |
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* and will be executed before the other tasks |
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* with the same priority (unless more tasks added |
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* later, of course) |
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*/ |
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void AddTaskL(CGlxtnTask* aTask, TExecutionOrder aExecutionOrder = ELastOut); |
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/** |
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* Cancel all tasks relating to a given media item. |
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* @param aItemId ID of media item. |
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*/ |
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void CancelTasks(const TGlxMediaId& aItemId); |
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/** |
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* Cancel all tasks using a given storage. |
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* @param aClient Reference to thumbnail storage. |
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*/ |
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void CancelTasks(MGlxtnThumbnailStorage* aStorage); |
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/** |
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* Gets the total task count |
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* |
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* @return TInt task count |
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*/ |
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inline TInt TaskCount() const { return iTasks.Count(); }; |
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protected: |
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/** |
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* Constructors |
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*/ |
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CGlxtnTaskManager(); |
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void ConstructL(); |
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private: // From CActive |
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void RunL(); |
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void DoCancel(); |
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TInt RunError(TInt aError); |
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private: |
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/** |
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* Issue a self-completing request causing RunL to be called. |
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*/ |
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void AsyncRun(); |
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private: |
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/** |
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* Task list in priority order |
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*/ |
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RPointerArray<CGlxtnTask> iTasks; |
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/** |
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* Task that is currently being run. |
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*/ |
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CGlxtnTask* iCurrentTask; |
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}; |
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#endif // C_GLXTNTASKMANAGER_H |