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 

    21 #include <glxlog.h>

    22 #include <glxpanic.h>

    23 

    24 // -----------------------------------------------------------------------------

    25 // Return new or existing instance

    26 // -----------------------------------------------------------------------------

    27 //

    28 template <class T>

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

    30 	{

    31 	// Get new or existing pointer to store.

    32 	// InstanceL stores the pointer in TLS

    33     CGlxSingletonStore* store = InstanceLC();

    34     	

    35     // Try to find existing object of type T

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

    37     TInt i = 0;

    38     T* obj = NULL;

    39     while (i < count && !obj) 

    40         {

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

    42         if (obj)

    43             {

    44             // Found an existing object of type T

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

    46             // Add another reference

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

    48             }

    49         i++;

    50         }

    51     

    52     // Create new object if one did not exist

    53     if ( !obj ) 

    54         {

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

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

    57         // class

    58         

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

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

    61         

    62         // Create a new object via provided factory function

    63         obj = aFactoryFuncL();

    64         

    65         // Give ownership of the new object to store

    66         TSingleton singleton;

    67         singleton.iObject = obj;

    68         singleton.iReferenceCount = 1;

    69         store->iSingletons.Append(singleton);

    70 

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

    72         }

    73 

    74     // Remove singleton store from cleanup stack

    75     CleanupStack::Pop(store);

    76 

    77 	return obj;

    78 	}    

    79