/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    TLS store for singleton objects

*

*/

#include <glxlog.h>

#include <glxpanic.h>

// -----------------------------------------------------------------------------

// Return new or existing instance

// -----------------------------------------------------------------------------

//

template <class T>

T* CGlxSingletonStore::InstanceL( T* (*aFactoryFuncL)() )

	{

	// Get new or existing pointer to store.

	// InstanceL stores the pointer in TLS

    CGlxSingletonStore* store = InstanceLC();

    // Try to find existing object of type T

    TInt count = store->iSingletons.Count();

    TInt i = 0;

    T* obj = NULL;

    while (i < count && !obj) 

        {

        obj = dynamic_cast<T*>(store->iSingletons[i].iObject);

        if (obj)

            {

            // Found an existing object of type T

            GLX_LOG_INFO1("CGlxSingletonStore::InstanceL, Found existing object %x", obj);

            // Add another reference

            store->iSingletons[i].iReferenceCount++;

            }

        i++;

        }

    // Create new object if one did not exist

    if ( !obj ) 

        {

        // If these calls leave, Cleanup stack will make sure tls 

        // pointer is cleared, if there are no other clients for CGlxSingletonStore

        // class

        // Reserve space in the array so that can safely append

        store->iSingletons.ReserveL( count + 1 );

        // Create a new object via provided factory function

        obj = aFactoryFuncL();

        // Give ownership of the new object to store

        TSingleton singleton;

        singleton.iObject = obj;

        singleton.iReferenceCount = 1;

        store->iSingletons.Append(singleton);

        GLX_LOG_INFO1 ("CGlxSingletonStore::InstanceL, Created new object %x", obj);

        }

    // Remove singleton store from cleanup stack

    CleanupStack::Pop(store);

	return obj;

	}