1 /*

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

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

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

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:   TLS store for singleton objects

    15 *

    16 */

    17 

    18 

    19 

    20 #include <glxlog.h>

    21 #include <glxpanic.h>

    22 

    23 // -----------------------------------------------------------------------------

    24 // Return new or existing instance

    25 // -----------------------------------------------------------------------------

    26 //

    27 template <class T>

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

    29 	{

    30 	// Get new or existing pointer to store.

    31 	// InstanceL stores the pointer in TLS

    32     CGlxSingletonStore* store = InstanceLC();

    33     	

    34     // Try to find existing object of type T

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

    36     TInt i = 0;

    37     T* obj = NULL;

    38     while (i < count && !obj) 

    39         {

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

    41         if (obj)

    42             {

    43             // Found an existing object of type T

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

    45             // Add another reference

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

    47             }

    48         i++;

    49         }

    50     

    51     // Create new object if one did not exist

    52     if ( !obj ) 

    53         {

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

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

    56         // class

    57         

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

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

    60         

    61         // Create a new object via provided factory function

    62         obj = aFactoryFuncL();

    63         

    64         // Give ownership of the new object to store

    65         TSingleton singleton;

    66         singleton.iObject = obj;

    67         singleton.iReferenceCount = 1;

    68         store->iSingletons.Append(singleton);

    69 

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

    71         }

    72 

    73     // Remove singleton store from cleanup stack

    74     CleanupStack::Pop(store);

    75 

    76 	return obj;

    77 	}    

    78