author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 16:00:21 +0300 | |
branch | RCL_3 |
changeset 32 | 2828b4d142c0 |
parent 0 | e686773b3f54 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005-2007 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: Helper class for asynchronous operations |
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* |
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*/ |
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#ifndef VPBKENGUTILS_CVPBKASYNCOPERATION_H |
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#define VPBKENGUTILS_CVPBKASYNCOPERATION_H |
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// INCLUDES |
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#include <e32base.h> |
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// FORWARD DECLARATIONS |
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namespace VPbkEngUtils { |
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// CLASS DECLARATIONS |
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/** |
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* Asynchronous callback interface |
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*/ |
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class MAsyncCallback |
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{ |
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public: |
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/** |
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* Destructor |
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*/ |
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virtual ~MAsyncCallback() {} |
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/** |
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* Calls the callback function. |
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*/ |
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virtual void operator()() = 0; |
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/** |
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* Called if operator()() leaves. |
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*/ |
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virtual void Error(TInt aError) = 0; |
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}; |
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/** |
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* Contact store asynchrnous operations. |
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*/ |
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class CVPbkAsyncOperation : public CBase |
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{ |
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public: // Constructor and destructor |
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/** |
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* Constructs the operation with priority CActive::EPriorityIdle. |
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*/ |
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IMPORT_C CVPbkAsyncOperation(); |
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/** |
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* Constructs the operation with aPriority. |
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* |
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* @param aPriority the priority for the active object. |
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*/ |
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IMPORT_C CVPbkAsyncOperation( CActive::TPriority aPriority ); |
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/** |
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* Destructor. |
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*/ |
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IMPORT_C ~CVPbkAsyncOperation(); |
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public: // New functions |
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/** |
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* Starts a new callback. Ownership is transferred in case |
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* the function does not leave. |
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* |
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* @param aCallback A callback instance e.g. from CVPbkAsyncCallback.h. |
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* Ownership is taken. |
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*/ |
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IMPORT_C void CallbackL(MAsyncCallback* aCallback); |
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/** |
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* Cancels and deletes all callbacks in this operation. |
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*/ |
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IMPORT_C void Purge(); |
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/** |
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* Cancels and deletes the aCallback from this operation. |
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* |
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* @param aCallback The callback to delete. |
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*/ |
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IMPORT_C void CancelCallback( const MAsyncCallback& aCallback ); |
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/** |
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* Returns the number of callbacks in this operation. |
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* |
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* @return The number of callbacks in this operation. |
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*/ |
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IMPORT_C TInt CallbackCount() const; |
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/** |
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* Returns a reference to the callback at position aIndex. |
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* |
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* @param aIndex The position of the callback. |
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* @return A reference to the callback at position aIndex. |
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*/ |
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IMPORT_C const MAsyncCallback& CallbackAt( TInt aIndex ) const; |
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private: // Implementation |
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void IssueRequest(); |
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TInt HandleIdleCallback(); |
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static TInt IdleCallback( TAny* aThis ); |
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|
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private: // Data |
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/// The priority of this operation |
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CActive::TPriority iPriority; |
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// Owned: Array of callbacks |
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RPointerArray<MAsyncCallback> iCallbacks; |
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// Not owned: Set if this object is destroyed |
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volatile TBool* iDestroyed; |
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/// Own: An idle for making the operation asynchronous. |
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CIdle* iIdle; |
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}; |
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} // namespace VPbkEngUtils |
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|
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/** |
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* A call back class that is identified by an object handle. |
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* Can be used e.g. when a single call back must be possible |
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* to cancel from CVPbkAsyncObjectOperation. |
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*/ |
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template<class ObjectHandle> |
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NONSHARABLE_CLASS(CVPbkAsyncObjectCallback) |
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: public CBase, |
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public VPbkEngUtils::MAsyncCallback |
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{ |
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public: |
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/** |
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* Constructor |
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* |
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* @param aObjectHandle This is a handle to the object that identifies |
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* the callback, |
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*/ |
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CVPbkAsyncObjectCallback( ObjectHandle& aObjectHandle ); |
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|
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/** |
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* Returns the ETrue if the callback is identified by aObjectHandle. |
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* |
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* @param aObjectHandle |
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*/ |
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TBool IsSame( ObjectHandle& aObjectHandle ) const; |
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|
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private: |
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/// Not Own: |
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ObjectHandle& iObjectHandle; |
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}; |
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|
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/** |
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* An operation class template for multiple callbacks that can be |
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* identified by an object handle. This enables canceling a single |
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* callback. |
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* |
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* Object handle could be e.g. an observer. |
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*/ |
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template<class ObjectHandle> |
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NONSHARABLE_CLASS(CVPbkAsyncObjectOperation) : public CBase |
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{ |
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public: // Constructor and destructor |
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|
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/** |
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* Constructs the operation with priority CActive::EPriorityStandard. |
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* |
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* @return A new instance of this class. |
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*/ |
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static CVPbkAsyncObjectOperation* NewL(); |
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|
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/** |
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* Destructor |
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*/ |
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~CVPbkAsyncObjectOperation(); |
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public: // New functions |
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/** |
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* Starts a new callback. Ownership is transferred in case |
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* the function does not leave. |
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* |
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* @param aCallback A callback instance e.g. from CVPbkAsyncCallback.h. |
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* Ownership is taken. |
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*/ |
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void CallbackL( CVPbkAsyncObjectCallback<ObjectHandle>* aCallback ); |
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|
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/** |
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* Cancels and deletes all the callbacks in this operation. |
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*/ |
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void Purge(); |
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/** |
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* Cancels and deletes a single callback identified by aObjectHandle. |
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* |
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* @param aObjectHandle A callback identifier. |
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*/ |
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void CancelCallback( ObjectHandle* aObjectHandle ); |
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private: |
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CVPbkAsyncObjectOperation(); |
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void ConstructL(); |
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private: // Data |
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/// Own: The async operation that implements most of the functionality. |
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VPbkEngUtils::CVPbkAsyncOperation* iAsyncOp; |
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}; |
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectCallback::CVPbkAsyncObjectCallback |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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inline CVPbkAsyncObjectCallback<ObjectHandle>::CVPbkAsyncObjectCallback( |
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ObjectHandle& aObjectHandle ) |
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: iObjectHandle( aObjectHandle ) |
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{ |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectCallback::IsSame |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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inline TBool CVPbkAsyncObjectCallback<ObjectHandle>::IsSame( |
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ObjectHandle& aObjectHandle ) const |
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{ |
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return &aObjectHandle == &iObjectHandle; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectOperation::CVPbkAsyncObjectOperation |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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inline CVPbkAsyncObjectOperation<ObjectHandle>::CVPbkAsyncObjectOperation() |
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{ |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectOperation::ConstructL |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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inline void CVPbkAsyncObjectOperation<ObjectHandle>::ConstructL() |
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{ |
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iAsyncOp = new( ELeave ) VPbkEngUtils::CVPbkAsyncOperation( |
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CActive::EPriorityStandard ); |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectOperation::NewL |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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inline CVPbkAsyncObjectOperation<ObjectHandle>* |
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CVPbkAsyncObjectOperation<ObjectHandle>::NewL() |
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{ |
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CVPbkAsyncObjectOperation* self = new( ELeave ) CVPbkAsyncObjectOperation; |
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CleanupStack::PushL( self ); |
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self->ConstructL(); |
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CleanupStack::Pop( self ); |
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return self; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectOperation::~CVPbkAsyncObjectOperation |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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CVPbkAsyncObjectOperation<ObjectHandle>::~CVPbkAsyncObjectOperation() |
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{ |
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delete iAsyncOp; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectOperation::CallbackL |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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inline void CVPbkAsyncObjectOperation<ObjectHandle>::CallbackL( |
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CVPbkAsyncObjectCallback<ObjectHandle>* aCallback) |
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{ |
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iAsyncOp->CallbackL( aCallback ); |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectOperation::Purge |
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// ----------------------------------------------------------------------------- |
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// |
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template<typename ObjectHandle> |
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inline void CVPbkAsyncObjectOperation<ObjectHandle>::Purge() |
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{ |
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iAsyncOp->Purge(); |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// CVPbkAsyncObjectOperation::CancelCallback |
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// ----------------------------------------------------------------------------- |
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// |
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template<class ObjectHandle> |
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inline void CVPbkAsyncObjectOperation<ObjectHandle>::CancelCallback( |
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ObjectHandle* aObjectHandle) |
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{ |
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const TInt count = iAsyncOp->CallbackCount(); |
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for ( TInt i = 0; i < count && aObjectHandle; ++i ) |
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{ |
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// MAsyncCallback instances can be safely casted to |
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// CVPbkAsyncObjectCallback because there can not be any other types |
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// in iAsyncOp. CallbackL takes only CVPbkAsyncObjectCallback types |
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// as input. |
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const CVPbkAsyncObjectCallback<ObjectHandle>& callback = |
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static_cast<const CVPbkAsyncObjectCallback<ObjectHandle>&>( |
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iAsyncOp->CallbackAt( i ) ); |
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if ( callback.IsSame( *aObjectHandle ) ) |
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{ |
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iAsyncOp->CancelCallback( callback ); |
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return; |
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} |
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} |
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} |
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|
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#endif // VPBKENGUTILS_CVPBKASYNCOPERATION_H |
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// End of file |
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|
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