author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 07:56:43 +0200 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007 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: API to control the command batch buffer |
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* |
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*/ |
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#ifndef C_ALFBATCHBUFFER_H |
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#define C_ALFBATCHBUFFER_H |
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#include <e32base.h> |
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class CAlfEnv; |
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/** |
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* Auto flush modes |
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* @see SetAutoFlushMode, AutoFlushMode |
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*/ |
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enum TAlfAutoFlushMode |
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{ |
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// Batch buffer is flushed automatically by scheduler = default |
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EAlfAutoFlushDeferred = 0, |
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// Every command is flushed instantly i.e. no batching |
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EAlfAutoFlushInstant, |
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// Batch buffer is used but only flushed with |
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// #1 manual call to FlushBatchBuffer |
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// #2 max buffer limit is reached |
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// #3 OOM when expanding the batch buffer |
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EAlfAutoFlushOnlyForced |
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}; |
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/** |
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* Size modes |
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* @see SetMaxBatchBufferSize |
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*/ |
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const TInt KAlfBatchBufferSizeLimitToSystemDefault = 0; |
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const TInt KAlfBatchBufferSizeNoLimit = -1; |
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/** |
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* Info types |
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* @see GetBatchBufferInfo |
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*/ |
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enum TAlfBatchBufferInfoType |
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{ |
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// Default buffer size which is used if not overridden. |
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// 100 <= DefaultBufferSize <= 10000 depending on the product. |
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EAlfBatchBufferInfoDefaultBufferSize, |
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// User defined max size. See SetMaxBatchBufferSize for the values. |
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// If user defined: MaxSize >= DefaultBufferSize |
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EAlfBatchBufferInfoMaxSize, |
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// Currently allocated buffer size. |
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// If not limited: DefaultBufferSize <= CurrentlyAllocated |
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// If limited: DefaultBufferSize <= CurrentlyAllocated <= MaxSize |
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EAlfBatchBufferInfoCurrentlyAllocated, |
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// Size which the commands use from the buffer. |
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// Always: CommandsAllocate <= CurrentlyAllocated |
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EAlfBatchBufferInfoCommandsAllocate |
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}; |
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/** |
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* API to control the command batch buffer |
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* |
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* @code |
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* CAlfBatchBuffer& batchBuffer = iEnv->BatchBufferHandler(); |
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* |
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* // Get the batch buffer max size in bytes |
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* const TInt maxSize = batchBuffer.GetBatchBufferInfo( EAlfBatchBufferInfoMaxSize ); |
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* |
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* // Flush manually |
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* batchBuffer.FlushBatchBuffer(); |
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* @endcode |
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* |
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* @lib alfclient.lib |
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* @since S60 v5.0 |
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*/ |
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NONSHARABLE_CLASS( CAlfBatchBuffer ): public CBase |
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{ |
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public: |
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/** |
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* Two-phased constructor. |
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* @param aEnv Environment class |
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* @return New instance. Ownership returned. |
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*/ |
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static CAlfBatchBuffer* NewL( CAlfEnv& aEnv ); |
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/** |
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* Destructor. |
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*/ |
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virtual ~CAlfBatchBuffer(); |
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/** |
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* Sets the automatic flush mode. |
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* |
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* @param aAutoFlushMode - see TAutoFlushMode |
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*/ |
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IMPORT_C void SetAutoFlushMode( TAlfAutoFlushMode aAutoFlushMode ); |
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/** |
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* Returns the automatic flush mode. |
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* |
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* @return Auto-flush mode - see TAlfAutoFlushMode. |
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*/ |
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IMPORT_C TAlfAutoFlushMode AutoFlushMode() const; |
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/** |
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* Flushes the batch buffer manually. |
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* |
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* Even on error case, the buffer is emptied. |
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* |
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* @return Symbian OS error code. |
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*/ |
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IMPORT_C TInt FlushBatchBuffer(); |
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/** |
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* Controls the batch buffer size. |
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* |
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* When the buffer reaches the max size, it will be automatically flushed |
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* if mode not equals EAutoFlushNever. |
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* |
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* The buffer will be also flushed, if expanding the buffer fails in OOM. |
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* |
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* @param aBufferSize |
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* >0 Batch buffer size in bytes. If < default size, |
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* the default size will be used. |
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* KAlfBatchBufferSizeLimitToSystemDefault uses the default size. |
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* KAlfBatchBufferSizeNoLimit re-allocates a bigger |
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* buffer when needed until OOM. |
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*/ |
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IMPORT_C void SetMaxBatchBufferSize( TInt aBufferSize ); |
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/** |
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* Get info about the batch buffer. |
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* |
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* @param aBufferInfoType See TAlfBatchBufferInfoType |
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* |
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* @return Value in bytes. |
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*/ |
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IMPORT_C TInt GetBatchBufferInfo( TAlfBatchBufferInfoType aBufferInfoType ) const; |
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private: |
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CAlfBatchBuffer(); |
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void ConstructL( CAlfEnv& aEnv ); |
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private: // data |
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struct TBatchBufferData; |
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TBatchBufferData* iData; |
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}; |
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#endif // C_ALFBATCHBUFFER_H |