1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/ossrv/lowlevellibsandfws/pluginfw/Framework/frame/UnloadPolicy.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,117 @@
     1.4 +// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.5 +// All rights reserved.
     1.6 +// This component and the accompanying materials are made available
     1.7 +// under the terms of "Eclipse Public License v1.0"
     1.8 +// which accompanies this distribution, and is available
     1.9 +// at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.10 +//
    1.11 +// Initial Contributors:
    1.12 +// Nokia Corporation - initial contribution.
    1.13 +//
    1.14 +// Contributors:
    1.15 +//
    1.16 +// Description:
    1.17 +// Implementation of the CUnloadPolicy class
    1.18 +// 
    1.19 +//
    1.20 +
    1.21 +/**
    1.22 + @internalComponent
    1.23 + @file
    1.24 +*/
    1.25 +#include <ecom/ecom.h>
    1.26 +#include <ecom/ecomerrorcodes.h>
    1.27 +#include <ecom/ecomresolverparams.h>
    1.28 +#include <ecom/implementationinformation.h>
    1.29 +#include "UnloadPolicy.h"
    1.30 +#include "TestUtilities.h"	// For __FILE__LINE__
    1.31 +#include "EComUidCodes.h"
    1.32 +
    1.33 +// Design Note:
    1.34 +// 	Dll text is per process.
    1.35 +// 	RLibrary handles are per thread.
    1.36 +// 	Therefore, data related to each loaded dll is per thread so no need for any mutex on say
    1.37 +// 	the reference counter.
    1.38 +
    1.39 +CUnloadPolicy* CUnloadPolicy::NewLC(const TEntry& aDllEntry)
    1.40 +	{
    1.41 +	CUnloadPolicy* self = new(ELeave) CUnloadPolicy();
    1.42 +	CleanupStack::PushL(self);
    1.43 +	self->ConstructL(aDllEntry);
    1.44 +	return self;
    1.45 +	}
    1.46 +
    1.47 +// Default d'tor
    1.48 +CUnloadPolicy::~CUnloadPolicy()
    1.49 +	{
    1.50 +	// Make sure the library is unloaded
    1.51 +	iLibrary.Close();
    1.52 +	// Remove the instance variable
    1.53 +	delete iDllEntry;
    1.54 +	}
    1.55 +
    1.56 +// Default c'tor
    1.57 +CUnloadPolicy::CUnloadPolicy()
    1.58 +	{
    1.59 +	// Do nothing here
    1.60 +	}
    1.61 +
    1.62 +void CUnloadPolicy::ConstructL(const TEntry& aDllEntry)
    1.63 +	{
    1.64 +	iDllEntry = CEComEntry::NewL(aDllEntry.iName,aDllEntry.iType[1],aDllEntry.iType[2]);
    1.65 +	}
    1.66 +
    1.67 +TUnloadPolicyStatus CUnloadPolicy::DecreaseReference()
    1.68 +	{
    1.69 +	// Already finished with this DLL OR
    1.70 +	// Note: There could be many clients per process	
    1.71 +	if (iReferencesInUseCount == 0 || --iReferencesInUseCount == 0)
    1.72 +		{
    1.73 +		return EDeleteMe;		
    1.74 +		}
    1.75 +	return EDontDeleteMe;
    1.76 +	}
    1.77 +
    1.78 +void CUnloadPolicy::IncreaseReference()
    1.79 +	{
    1.80 +	++iReferencesInUseCount;
    1.81 +	}
    1.82 +
    1.83 +TInt CUnloadPolicy::ReferenceCount() const
    1.84 +	{
    1.85 +	return iReferencesInUseCount;
    1.86 +	}
    1.87 +
    1.88 +TLibraryFunction CUnloadPolicy::LoadDllAndReturnProxyL()
    1.89 +	{
    1.90 +	// Function at ordinal 1 is InstantiationMethodL()
    1.91 +	const TInt KImplementationGroupProxy = 1;
    1.92 +
    1.93 +	// If we have already loaded the library
    1.94 +	if(iReferencesInUseCount > 0)
    1.95 +		{
    1.96 +		IncreaseReference();
    1.97 +		return iLibrary.Lookup(KImplementationGroupProxy);
    1.98 +		}
    1.99 +	const TDesC& libraryPath = iDllEntry->GetName();
   1.100 +	if(libraryPath.Length())
   1.101 +		{
   1.102 +		// Load up the specified library and its default method
   1.103 +		// Dynamically load DLL	
   1.104 +		User::LeaveIfError(iLibrary.Load(libraryPath, TUidType(KDynamicLibraryUid,iDllEntry->GetSecondUid(),iDllEntry->GetThirdUid())));
   1.105 +		// Add to the reference count now to keep the
   1.106 +		// library loaded for the instantiation call.
   1.107 +		// IF the client fails before instantiating an implementation
   1.108 +		// we can rely upon CEcomServerSession to correctly call
   1.109 +		// for an implementations reference to be removed.
   1.110 +		IncreaseReference();
   1.111 +		return iLibrary.Lookup(KImplementationGroupProxy);
   1.112 +		}
   1.113 +	return NULL;
   1.114 +	}	
   1.115 +
   1.116 +const CEComEntry& CUnloadPolicy::DllEntryInformation() const
   1.117 +	{
   1.118 +	return *iDllEntry;
   1.119 +	}
   1.120 +