--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/presetserver/clientinc/pstransaction.h	Mon Apr 19 14:01:53 2010 +0300
@@ -0,0 +1,113 @@
+/*
+* Copyright (c) 2006-2006 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:  Defines a transaction
+*
+*/
+
+
+#ifndef C_CPSTRANSACTION_H
+#define C_CPSTRANSACTION_H
+
+#include <e32base.h>
+
+/**
+ * Pure virtual base class for transactions.
+ */
+NONSHARABLE_CLASS( MPSTransactionEntity )
+    {
+
+public:
+
+    /**
+     * Begins an explicit transaction.
+     */
+    virtual void BeginTransactionL() = 0;
+    
+    /**
+     * Commits changes done during the transaction.
+     */
+    virtual void CommitL() = 0;
+    
+    /**
+     * Reverts changes done during the transaction.
+     */
+    virtual void Rollback() = 0;
+
+    };
+
+/**
+ * Defines a transaction.
+ *
+ * Transactions must be created whenever any value of the transaction is to be modified. They provide
+ * means to synchronize transaction item updates so that they cannot be updated simultaneously by two clients.
+ *
+ * Transactions cannot be created as is, as they must be created through transactable entities.
+ *
+ * To create a transaction with a preset, use CPSPresetInterface::CreateTransactionL() or CPSPresetInterface::CreateTransactionLC().
+ *
+ * When a transaction is started, the transaction entity remains in locked state until it is either committed or rollbacked.
+ */
+NONSHARABLE_CLASS( CPSTransaction ) : public CBase
+    {
+
+public:
+
+    /**
+     * Destructor
+     */
+    IMPORT_C ~CPSTransaction();
+    
+    /**
+     * Completes the transaction, committing all changes done to the preset.
+     */
+    IMPORT_C void CommitL();
+
+    /**
+     * Completes the transaction, reverting all changes done to the preset.
+     */
+    IMPORT_C void Rollback();
+
+public:
+
+    /**
+     * Creates a new preset transaction object.
+     * 
+     * @param   aEntity     The transaction entity to start the transaction with.
+     */
+    static CPSTransaction* NewL( MPSTransactionEntity& aEntity );
+
+private:
+
+    /**
+     * Constructor.
+     * 
+     * @param   aEntity     The transaction entity to start the transaction with.
+     */
+    CPSTransaction( MPSTransactionEntity& aEntity );
+
+    /** 
+     * Second-phase constructor.
+     */
+    void ConstructL();     
+           
+private:
+    
+    /** The transaction entity. */
+    MPSTransactionEntity& iEntity;
+    /** Extension. */
+    TAny* iExtension;
+
+    };
+
+#endif // C_CPSTRANSACTION_H