--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emailservices/emailstore/base_plugin/inc/baseplugindelayedops.h	Thu Dec 17 08:39:21 2009 +0200
@@ -0,0 +1,111 @@
+/*
+* Copyright (c) 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: Support for executing asynchronously certain plugin
+* operations.
+*/
+
+
+#ifndef __BASEPLUGINDELAYEDOPS_H__
+#define __BASEPLUGINDELAYEDOPS_H__
+
+
+#include <e32base.h>
+#include "CFSMailCommon.h"
+#include "BasePlugin.h"
+#include "DebugLogMacros.h"
+
+
+class CBasePlugin;
+class CDelayedOp;
+
+
+/**
+ * The interface to the delayed operations manager implementation. Plugins
+ * must talk to the manager only through this interface.
+ */
+class MDelayedOpsManager
+    {
+
+public:
+
+    /**
+     * 
+     */
+    virtual ~MDelayedOpsManager() {};
+    
+    /**
+     * @param aOp ownership is transferred 
+     */
+    virtual void EnqueueOpL( CDelayedOp* aOp ) = 0;
+            
+    /**
+     * @param aOp the caller must delete the operation
+     */
+    virtual void DequeueOp( const CDelayedOp& aOp ) = 0;
+
+    /**
+     * API for future extensions.
+     */
+    virtual TInt Extension1(
+        TUint aExtensionId, TAny*& a0, TAny* a1 ) = 0;
+    
+    };
+
+
+
+/**
+ * The base class for the delayed operations. All of the delayed operations must
+ * derive from it.
+ */
+class CDelayedOp : public CAsyncOneShot
+    {
+
+public:
+    
+    IMPORT_C virtual ~CDelayedOp();
+    
+    IMPORT_C void SetContext(
+        CBasePlugin& aPlugin,
+        MDelayedOpsManager& aManager );
+    
+    /**
+     * Derived classes must implement their asynchronous processing in this
+     * method. The GetPlugin method can only be used from within this method.
+     */
+    virtual void ExecuteOpL() = 0;
+
+protected:
+    
+    IMPORT_C CDelayedOp();
+    
+    /**
+     * Returns the plugin instance associated with this operation. Available
+     * only from within the ExecuteOpL method.
+     */
+    IMPORT_C CBasePlugin& GetPlugin();
+    
+    
+private:
+    
+    IMPORT_C virtual void RunL();
+    IMPORT_C virtual void DoCancel();
+
+private:
+    MDelayedOpsManager* iManager;   //not owned
+    CBasePlugin* iPlugin;           //not owned
+    
+    __LOG_DECLARATION
+    };
+
+#endif // __BASEPLUGINDELAYEDOPS_H__