bluetoothengine/btaudioman/inc/basrvactive.h
author William Roberts <williamr@symbian.org>
Mon, 08 Mar 2010 21:43:36 +0000
branchCompilerCompatibility
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/*
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* Copyright (c) 2005-2006 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:  The base active object declaration
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*
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*/
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#ifndef C_BASRVACTIVE_H
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#define C_BASRVACTIVE_H
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//  INCLUDES
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#include <e32base.h>
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class CBasrvActive;
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/**
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 * The observer of CBasrvActive's request events
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 *
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 * This class defines the interface to handle a async request events from CBasrvActive.
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 *
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 * @since S60 v3.1
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 */
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class MBasrvActiveObserver
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    {
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public:
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    /**
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     * Handles the request completion event.
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     *
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     * @since S60 v3.1
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     * @param aActive the Active Object to which the request is assigned to.
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     */
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    virtual void RequestCompletedL(CBasrvActive& aActive) = 0;
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    /**
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     * Handles the cancellation of an outstanding request.
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     *
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     * @since S60 v3.1
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     * @param aActive the Active Object to which the request is assigned to.
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     */
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    virtual void CancelRequest(CBasrvActive& aActive) = 0;
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    };
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/**
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 * A base class for abstract Active Objects.
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 *
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 * This class provides TRequestStatus for an async operation but it doesn't know the
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 * detail of the request. CBasrvActive could be used to implement timers, P&S subscribes 
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 * that are "simple" enough operations. 
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 *
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 * @since S60 v3.1
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 */
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class CBasrvActive : public CActive
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    {
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public:
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    static CBasrvActive* New(MBasrvActiveObserver& aObserver, 
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        CActive::TPriority aPriority, TInt aRequestId);
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    static CBasrvActive* NewL(MBasrvActiveObserver& aObserver, 
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        CActive::TPriority aPriority, TInt aRequestId);
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    static CBasrvActive* NewLC(MBasrvActiveObserver& aObserver, 
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        CActive::TPriority aPriority, TInt aRequestId);
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    virtual ~CBasrvActive();
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public:
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    /**
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     * Calls SetActive().
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     *
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     * @since S60 v3.1
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     */
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    virtual void GoActive();
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    /**
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     * Gets the identifier of the request that this active object is serving.
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     *
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     * @since S60 v3.1
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     * @return the request identifier
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     */
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    TInt RequestId() const;
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    /**
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     * Gets the identifier of the request that this active object is serving.
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     *
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     * @since S60 v3.1
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     * @param the request identifier
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     */
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    void SetRequestId(TInt aRequestId);
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protected:
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    /**
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     * From CActive. 
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     * cancels the outstanding request.
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     *
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     * @since S60 v3.1
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     */
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    virtual void DoCancel();
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    /**
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     * From CActive. 
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     * Handles the request completion event.
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     *
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     * @since S60 v3.1
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     */
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    virtual void RunL();
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    /**
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     * From CActive. 
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     * Handles the leave from RunL().
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     *
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     * @since S60 v3.1
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     * @param aError the leave code in RunL()
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     * @return the error code to Active Scheduler
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     */
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    virtual TInt RunError(TInt aError);
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protected:
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    CBasrvActive(MBasrvActiveObserver& aObserver, 
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        CActive::TPriority aPriority, TInt aRequestId);
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    MBasrvActiveObserver& Observer();
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private:
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    /**
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     * The observer which is interested in the request handling events.
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     * Not own.
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     */
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    MBasrvActiveObserver& iObserver;
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    /**
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     * The request identifier assigned to this active object.
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     */
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    TInt iRequestId;
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    };
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#endif  // C_BASRVACTIVE_H