srsf/vcommandhandler/src/asyncworker.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 19 Aug 2010 09:56:14 +0300
branchRCL_3
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/*
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* Copyright (c) 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:  Class that is able to pause the execution until the 
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*                asynchronous call resumes it. Knows how to leave the
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*                resumed function with the error code supplied by the
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*                resuming asynchronous call
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*
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*/
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#include "rubydebug.h"
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#include "asyncworker.h"
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// async worker panic code
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_LIT( KAsyncWorkerPanic, "AWRK" );
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CAsyncWorker* CAsyncWorker::NewLC()
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	{
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	CAsyncWorker* self = new (ELeave) CAsyncWorker;
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	CleanupStack::PushL( self );
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	return self;
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	}
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CAsyncWorker* CAsyncWorker::NewL()
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	{
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	CAsyncWorker* self = CAsyncWorker::NewLC();
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	CleanupStack::Pop( self );
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	return self;
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	}
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CAsyncWorker::~CAsyncWorker()
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	{
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	delete iWaiter;  // if any
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	}
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/**
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* Pauses the execution until StopAsyncWaitingL is called
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* Leaves if StopAsyncWaitingL is called with the negative error code
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* @leave KErrNotReady if another waiting is still in progress
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* @leave Leaves with the error code passed to StopAsyncWaitingL
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*/
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void CAsyncWorker::WaitForAsyncCallbackL()
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	{
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	/** @todo Change to RUBY_ASSERT_ALWAYS */
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	RUBY_DEBUG_BLOCKL( "CAsyncWorker::WaitForAsyncCallbackL" );
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	if( iWaiter )
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		{
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		RUBY_ERROR0( "CAsyncWorker::WaitForAsyncCallbackL Already waiting" );
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		}
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	__ASSERT_ALWAYS( !iWaiter, User::Leave( KErrNotReady ) );
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	iErr = KErrNone;
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    iWaiter = new (ELeave) CActiveSchedulerWait;
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    iWaiter->Start();
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    delete iWaiter;
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    iWaiter = NULL;
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    User::LeaveIfError( iErr );
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	}
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/** 
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* Resumes the process paused by WaitForAsyncCallbackL
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* @param aErr Result code to pass to the 
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*        WaitForAsyncCallbackL error handling. Note, that 
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*        WaitForAsyncCallbackL leaves only if aErr is negative
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* @return KErrNotReady if no waiting is in progress. Otherwise KErrNone
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*/
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TInt CAsyncWorker::StopAsyncWaiting( TInt aErr )
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	{
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    RUBY_DEBUG1( "CAsyncWorker::StopAsyncWaitingL aErr [%d] ", aErr ); 
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    iErr = aErr;   
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    /** @todo Change to RUBY_ASSERT_ALWAYS */
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	if( !iWaiter )
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		{
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		RUBY_ERROR0( "CAsyncWorker::WaitForAsyncCallbackL Not waiting" );
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		}
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	if( !iWaiter)
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		{
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		return KErrNotReady;
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		}
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    iWaiter->AsyncStop();
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    return KErrNone;
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	}
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/**
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* Same as StopAsyncWaiting, but panics with AWRK <error code> instead 
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* of returning the error code
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* @see StopAsyncWaiting
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*/
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void CAsyncWorker::StopAsyncWaitingOrPanic( TInt aErr )
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	{
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	TInt err = StopAsyncWaiting( aErr );
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	if( err != KErrNone ) 
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		{
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		User::Panic( KAsyncWorkerPanic, err );
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		}
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	}
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//End of file