commsfwutils/commsbufs/inc/systemsharedasyncalloc.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 09:22:25 +0200
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// Copyright (c) 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: Asynchronous allocation from the system shared buffer pool
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//
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#ifndef __SYSTEMSHAREDASYNCALLOC_H__
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#define __SYSTEMSHAREDASYNCALLOC_H__
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#include <es_commsbuf.h>
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#include <elements/rworkerlock.h>
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/**
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Notifies the asyncronous request completion or error
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@internalTechnology
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*/
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class MAsyncAllocNotifier 
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	{
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	public:
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	virtual void OnCompletion() =0;
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	virtual void OnError(TInt aError) =0;
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	};
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class CSystemSharedBufPool;
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/**
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Asynchronous allocation from the single system shared pool  
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@internalTechnology
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*/
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NONSHARABLE_CLASS(CSystemSharedPoolAsyncAlloc) : public CActive
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	{
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	friend class CSystemSharedAsyncAlloc;
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	public:
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	CSystemSharedPoolAsyncAlloc(CSystemSharedBufPool& aPool, MAsyncAllocNotifier& aNotifer);	
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	~CSystemSharedPoolAsyncAlloc();
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	void Activate(TInt aFreeBufs);
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	void Deactivate();
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	private:
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	// From CActive
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	void RunL();
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	TInt RunError(TInt aError);
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	void DoCancel();
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	private:
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	CSystemSharedBufPool&	iPool;
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	MAsyncAllocNotifier&	iNotifier;
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	};
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class CSystemSharedBufPool;
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/**
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Manages the asynchronous allocation from the system shared pools.
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@internalTechnology
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*/
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NONSHARABLE_CLASS(CSystemSharedAsyncAlloc) : public CActive, public MAsyncAllocNotifier
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	{
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	enum TAsyncRequestState
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	    {
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	    EMakeRequest = 0,
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	    ECancelRequest,
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	    };
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	public:
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	static CSystemSharedAsyncAlloc* New(const RPointerArray<CSystemSharedBufPool>& aPools);
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	~CSystemSharedAsyncAlloc();
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	void StartRequest(CCommsBufAsyncRequest& aRequest);
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	void CancelRequest(CCommsBufAsyncRequest& aRequest);
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	private:
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	CSystemSharedAsyncAlloc();
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	TInt Construct(const RPointerArray<CSystemSharedBufPool>& aPools);	
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	void MakePoolAsyncRequest();
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	void MakePoolRequest();
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	void CancelPoolAsyncRequest();
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	void CancelAllPoolRequest();
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	void ActivateSelf();
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	void CompleteSelf();
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	void CancelSelf();
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   // From MAsyncAllocNotifier
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    virtual void OnCompletion();
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    virtual void OnError(TInt aError);  
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    // From CActive
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    void RunL();
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    void DoCancel();
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    void CompleteAsyncAllocs(); 
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	private:
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	RPointerArray<CSystemSharedPoolAsyncAlloc> 	iAsyncAllocPools;
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	TAsyncRequestState                  iRequestState;
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    RThread                             iOwnerThread;
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    TBool                               iSignalled;
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    RWorkerLock                         iAsynAllocLock;
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    TDblQue<CCommsBufAsyncRequest>      iAllocsPending;     
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	};
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#endif // __SYSTEMSHAREDASYNCALLOC_H__