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// Copyright (c) 2002-2009 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:
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//
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#ifndef __LOGSERVOPERATIONQUEUE_H__
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#define __LOGSERVOPERATIONQUEUE_H__
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#include <e32base.h>
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#include "LogServDefs.h"
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#include "LogServShared.h"
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#include "LogServOperationManager.h"
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// Classes referenced
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class MLogServTaskInterface;
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class CLogServOperationBase;
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/**
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Implements the MLogServOperationManager interface.
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The class maintains two queues of operations:
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- "pending operations" queue. All pending operations are kept in here for execution;
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- "completed operations" queue. If particular operation returns results for the client, that
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operation will be moved to here after the execution;
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CLogServOperationQueue implements MLogServOperationManager and dereives from CActive.
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Every time when a new operation is added to the queue, CLogServOperationQueue object completes itsef
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and schedules itself for an execution. When the active scheduler calls the RunL() method of the class,
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an operation will be picked up from the pending queue and started.
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@see MLogServOperationManager
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@see MLogServTaskInterface
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@see CLogServOperationBase
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@internalComponent
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*/
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class CLogServOperationQueue : public CActive, public MLogServOperationManager
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{
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public:
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static CLogServOperationQueue* NewL(MLogServTaskInterface& aTaskInterface, TInt aPriority);
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~CLogServOperationQueue();
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private:
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CLogServOperationQueue(MLogServTaskInterface& aTaskInterface, TInt aPriority);
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private: // From MLogServOperationManager
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void OMOperationQueueAdd(CLogServOperationBase& aOperation);
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void OMOperationQueueRemove(CLogServOperationBase& aOperation);
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void OMGetResultL(TLogOperationId aId, TLogServSessionId aSessionId, const RMessage2& aMessageToWriteTo);
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void OMCancel(TLogOperationId aId, TLogServSessionId aSessionId, TBool aCompleteRequest);
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void OMCancel(TLogServSessionId aSessionId, TBool aCompleteRequest);
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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: // Internal methods
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void CompleteRequest(TInt aCompletionCode = KErrNone);
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void StartNextOpL();
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void DeleteFromQueue(TSglQue<CLogServOperationBase>& aQueue, TLogOperationId aOperationId, TLogServSessionId aSessionId);
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TBool QueueContainsOperation(TSglQue<CLogServOperationBase>& aQueue, TLogOperationId aOperationId, TLogServSessionId aSessionId);
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CLogServOperationBase* FindOperation(TSglQue<CLogServOperationBase>& aQueue, TLogOperationId aOperationId, TLogServSessionId aSessionId);
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private: // Member data
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MLogServTaskInterface& iTaskInterface;
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CLogServOperationBase* iCurrentOperation;
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TSglQue<CLogServOperationBase> iQueuePending;
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TSglQue<CLogServOperationBase> iQueueCompleted;
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};
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#endif
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