author | hgs |
Wed, 13 Oct 2010 19:39:18 +0530 | |
changeset 71 | 28ccaba883f4 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// |
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|
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/** |
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@file |
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@internalComponent |
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*/ |
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|
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#ifndef __RESOLVERCACHE_H__ |
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#define __RESOLVERCACHE_H__ |
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#include <e32base.h> |
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#include <ecom/implementationproxy.h> |
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#include "callback.h" |
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|
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class CResolver; |
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class CRegistryData; |
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class CRegistryResolveTransaction; |
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/** class TCounterTicks keep track of time an entry will remain in cache. */ |
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class TCounterTicks |
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{ |
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public: |
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inline TCounterTicks(TUint aTicks = 0); |
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inline TUint ElapsedSinceThis(TUint aEndTick) const; |
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public: |
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TUint iTicks; |
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}; |
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/** Bit mask indicating special conditions of cache entries */ |
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enum TCacheEntryFlags |
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{ |
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EEntryFlagsNone = 0, |
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EEntryIsOnReadWriteDrive = 0x1 |
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}; |
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/** An entry in ECOM's custom resolver cache */ |
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class RResolverCacheEntry |
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{ |
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public: |
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RResolverCacheEntry(); |
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RResolverCacheEntry(const TUid aResolverUid, |
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RLibrary aLib, |
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TProxyNewLPtr aNewL, |
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TUint32 aFlags); |
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void Close(); |
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static TInt CompareUid(const RResolverCacheEntry& aEntry1, const RResolverCacheEntry& aEntry2); |
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TBool ThisIsOlder(const RResolverCacheEntry& aOther, TUint aCurrTick) const; |
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public: |
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/** Timestamp, when the resolver is last accessed */ |
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TCounterTicks iLastUse; |
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|
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/** An extension of iLastUse. Serves as tie breaker when 2 entries |
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have the same timestamp. */ |
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TInt iLruRank; |
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/** TUid of the custom resolver */ |
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TUid iResolverUid; |
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/** Function ptr to instantiate the custom resolver */ |
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TProxyNewLPtr iNewLFuncPtr; |
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/** RLibraray object holding a handle on the resolver DLL */ |
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RLibrary iLibrary; |
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/** Special conditions about the cache entry. */ |
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TUint32 iFlags; |
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}; |
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/** Handles caching custom resolvers */ |
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class CCustomResolverCache : public CTimer |
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{ |
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public: |
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static CCustomResolverCache* NewL(TUint32 aCacheSize, TUint32 aCacheTimeout); |
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virtual ~CCustomResolverCache(); |
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TInt CacheResolver(const TUid aResolverUid, |
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RLibrary aLib, |
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TProxyNewLPtr aNewL, |
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TUint32 aFlags); |
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TBool CacheLookup(const TUid aResolverUid, TProxyNewLPtr& aNewLFuncPtr); |
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TBool CachingEnabled() const; |
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TBool Remove(const TUid aResolverUid); |
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void RemoveItemsWithFlags(TUint32 aMask); |
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private: |
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CCustomResolverCache(TUint32 aCacheSize); |
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void ConstructL(TUint32 aCacheTimeout); |
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void RunL(); // implement the CActive pure virtual |
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TInt FindResolver(const TUid aResolverUid) const; |
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void Remove(TInt aIndex); |
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void EvictLeastRecentlyUsed(); |
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void SetLastUseTime(RResolverCacheEntry& aEntry); |
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private: |
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/** list of cached resolvers */ |
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RArray<RResolverCacheEntry> iResolvers; |
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/** max. number of entries allowed in iResolvers */ |
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TUint32 iMaxCacheSize; |
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/** Store the system tick period as member data to avoid |
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having to invoke HAL::Get() repeatedly. */ |
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TInt iSystemTickPeriod; |
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/** cache timeout value. Unit is number of system ticks */ |
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TUint iEntryTimeToLive; |
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/** Keep track of youngest timestamp of cache entries. Use to |
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detect if two entries have same timestamp. */ |
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TUint iMostRecentTimestamp; |
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#ifdef __ECOMSERVER_TESTING__ |
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// For unit testing purpose. The test harness installs a callback |
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// here to detect when the cache timer fires. |
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TCallBackWithArg iTimerExpireCB; |
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#endif |
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// the test bed state accessor |
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friend class CCustomResolverCacheTest; |
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}; |
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#endif |