diff -r 780f926bc26c -r f83bd4ae1fe3 emailservices/emailclientapi/inc/emailmailboxcache.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/emailservices/emailclientapi/inc/emailmailboxcache.h	Thu Jun 24 14:32:18 2010 +0300
@@ -0,0 +1,138 @@
+/*
+* Copyright (c) 2010 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: Definition for mailbox cache
+*
+*/
+
+#ifndef EMAILMAILBOXCACHE_H
+#define EMAILMAILBOXCACHE_H
+
+#include <e32base.h> 
+#include <emailapidefs.h>
+
+using namespace EmailInterface;
+
+class CPluginData;
+
+
+/**
+* Cache associating mailbox with a protocol plugin. Improves performance by
+* removing need to load protocol plugins every time a mailbox needs to be
+* accessed (and keeping plugin loaded when it is not needed)
+* @since s60 v5.2
+*/
+NONSHARABLE_CLASS( CEmailMailboxCache ) : public CBase
+{
+public:
+    /**
+    * Cache entry to access plugin by mailbox id
+    */
+    class TCacheEntry
+    {
+    public:
+        inline TCacheEntry( 
+            CPluginData* aPluginData, 
+            TMailboxId aId ) : 
+            iPluginData( aPluginData ), 
+            iMailboxId( aId ) {}
+        CPluginData* iPluginData;
+        TMailboxId iMailboxId;
+    };
+    
+    /**
+    * Constructor
+    */
+    static CEmailMailboxCache* NewL();
+    
+    /** destructor */
+    ~CEmailMailboxCache();
+    
+    /**
+    * Clears cache and indicates that one or more AddMailboxL calls will 
+    * follow.
+    * Cleanup support invalidates cache if leave occurs before EndCachingPop()
+    * is called
+    */
+    void StartCachingPushL();
+    
+    /**
+    * Marks caching fully complete for all mailboxes (call when no more
+    * AddMailboxL will follow) and pops cleanup item.
+    */
+    void EndCachingPop();      
+    
+    /**
+    * Returns if mailboxes are cached
+    */
+    TBool IsCached() const;
+
+    /**
+    * Adds mailbox to cache.
+    * @param aPluginData mailbox associated with plugin(data)
+    * @param aMailboxId mailbox id
+    * @precondition: StartCaching must have been called. 
+    */
+    void AddMailboxL( CPluginData& aPluginData, const TMailboxId& aMailboxId );
+    
+    /**
+    * Returns plugin data by mailbox id
+    * @param aMailboxId 
+    * @return plugin data associated with specified mailbox
+    */
+    CPluginData* PluginDataL( const TMailboxId& aMailboxId ) const;
+
+    /**
+    * Returns plugin data by plugin id
+    * @param aPluginId 
+    * @return plugin data associated with specified plugin
+    */
+    CPluginData* PluginDataL( const TUid& aPluginId ) const;
+    
+    /**
+    * Gets all mailbox ids in all protocol plugins
+    */
+    void GetIdsL( REmailMailboxIdArray& aIdArray ) const;
+    
+private:    
+
+    TInt FindById( const TMailboxId& aMailboxId ) const;
+    TInt FindByPluginIdL( const TUid& aPluginId ) const;    
+    static TBool Equals( const TCacheEntry& a1, const  TCacheEntry& a2 );
+    static TBool PluginEquals( const TCacheEntry& a1, const  TCacheEntry& a2 );
+    
+    static void CleanupOp( TAny* aAny );
+    
+private:
+    
+    CEmailMailboxCache();
+    
+    void ConstructL();
+
+    enum TCacheState {
+        EEmpty,
+        ECaching,
+        EComplete
+    };
+private:
+    // empty, caching or caching complete
+    TCacheState iState;
+
+    // cached mailbox id with associated plugin data
+    RArray<TCacheEntry> iEntries;
+};
+
+
+#endif // EMAILMAILBOXCACHE_H
+
+// End of file