author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 27 Apr 2010 17:34:42 +0300 | |
branch | RCL_3 |
changeset 17 | 3ac8bf5c5014 |
parent 11 | 46927d61fef3 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2006-2009 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: Main functionality for Graphics Out of Memory Monitor |
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* |
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*/ |
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#ifndef GOOMMONITORPLUGIN_H |
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#define GOOMMONITORPLUGIN_H |
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#include <e32base.h> |
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class CMemoryMonitor; |
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class RFs; |
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class RWsSession; |
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// temp support for migration |
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#define __GOOM_PLUGIN_API_V2 |
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enum TGOomMonitorFlags |
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{ |
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KGOomNone = 0, |
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KGOomUseSwRendering |
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}; |
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/** |
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* Panic codes with category "OomMonitorPlugin" |
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*/ |
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enum TGOomMonitorPluginPanic |
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{ |
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/** |
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* The plugin has been constructed by a thread other than the GOOM monitor. |
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*/ |
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EGOomMonitorPluginPanic_PluginConstructedOutsideGOomMonitorThread |
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}; |
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// Message type used to signal an GOOM plug-in to free some memory. |
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const TInt KAppGOomMonitor_FreeRam = 0x10282304; |
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// Message type used to signal an OOM plug-in that there is free memory again. |
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const TInt KAppGOomMonitor_MemoryGood = 0x10282305; |
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class CGOomMonitorPluginBase : public CBase |
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{ |
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public: |
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/** |
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* Constructor |
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* Plugins should assume that the system memory is good when |
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* they are created. |
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*/ |
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IMPORT_C CGOomMonitorPluginBase(); |
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/** |
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* Destructor |
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*/ |
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IMPORT_C ~CGOomMonitorPluginBase(); |
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/** |
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* 2nd stage constructor |
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*/ |
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IMPORT_C void ConstructL(); |
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public: |
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/** |
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* FreeRam is called when the system RAM level becomes |
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* low. This plugin is requested to help free some RAM. |
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*/ |
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//virtual void FreeRam(TInt aBytesToFree); |
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virtual void FreeRam(TInt aBytesToFree, TInt aFlags) = 0; |
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/** |
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* MemoryGood is called when the system RAM level becomes |
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* good after being low.The plugin may take this opportunity |
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* to start using RAM again. |
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* Nb It is assumed that the plugin will not immediately |
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* cause a large increase in memory use, but that memory may be |
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* used over time, otherwise the plugin may cause oscillation |
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* between low and good memory states. |
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*/ |
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//virtual void MemoryGood(); |
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virtual void MemoryGood(TInt aFlags) = 0; |
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public: |
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/** |
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* Get a handle to the file server. |
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* @return a connected file server session. |
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*/ |
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IMPORT_C RFs& FsSession(); |
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/** |
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* Get a handle to the window server. |
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* @return a connected window server session. |
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*/ |
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IMPORT_C RWsSession& WsSession(); |
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IMPORT_C virtual void ExtensionInterface(TUid aInterfaceId, TAny*& aImplementaion); |
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private: |
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CMemoryMonitor* iMemoryMonitor; |
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}; |
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class CGOomMonitorPlugin : public CGOomMonitorPluginBase |
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{ |
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public: // new functions |
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CGOomMonitorPlugin():CGOomMonitorPluginBase(){} |
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public: // From CGOomMonitorPluginBase |
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/** |
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* FreeRam is called when the system graphics memory level becomes |
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* low. This plugin is requested to help free some RAM. |
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* |
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* this version of the function should not need to be implemented. |
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* The definition of this function should change once the alf plugin is stable and finetuned |
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* @param aBytesToFree The minimum number of bytes of free memory that the plugin should try to free. |
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*/ |
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virtual void FreeRam(TInt aBytesToFree, TInt aFlags) = 0; |
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/** |
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* MemoryGood is called when the system RAM level becomes |
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* good after being low.The plugin may take this opportunity |
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* to start using RAM again. |
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* Nb It is assumed that the plugin will not immediately |
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* cause a large increase in memory use, but that memory may be |
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* used over time, otherwise the plugin may cause oscillation |
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* between low and good memory states. |
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*/ |
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virtual void MemoryGood(TInt aFlags) = 0; |
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}; |
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/** |
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* CAppOomMonitorPlugin is a specialised OOM monitor plugin |
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* that sends messages to applications when the memory state |
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* changes. |
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* The target application is specified by the appUid parameter. |
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* the message will be sent to all running instances of this app. |
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* The messages are: |
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* KAppOomMonitor_FreeRam when memory should be released. |
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* KAppOomMonitor_MemoryGood when memory is good again. |
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* |
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* These messages can be picked up in the app UI like this: |
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* void CMyAppUi::HandleApplicationSpecificEventL(TInt aType, const TWsEvent& aEvent) |
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* { |
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* CAknAppUi::HandleApplicationSpecificEventL(aType, aEvent); |
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* if (aType == KAppOomMonitor_FreeRam) |
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* { |
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* // release memory and disable memory use |
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* } |
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* else if (aType == KAppOomMonitor_MemoryGood) |
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* { |
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* // re-enable memory use |
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* } |
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* } |
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* |
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* The plugin can be instantiated in an ECom factory function. |
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* The application does not need to derive from this class. |
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* For example: |
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* TAny* CreateAppPlugin() |
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* { |
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* return CAppOomMonitorPlugin::NewL(KMyAppUid); |
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* } |
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*/ |
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NONSHARABLE_CLASS(CAppGOomMonitorPlugin) : public CGOomMonitorPluginBase |
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{ |
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public: |
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IMPORT_C static CAppGOomMonitorPlugin* NewL(TUid aAppUid); |
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private: |
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CAppGOomMonitorPlugin(TUid aAppUid); |
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/*void FreeRam(TInt aFreeMemory); |
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void MemoryGood(); |
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*/ |
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void FreeRam(TInt aBytesToFree, TInt aFlags); |
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void MemoryGood(TInt aFlags); |
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|
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void SendMessageToApp(TInt aMessage); |
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private: |
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TUid iAppUid; |
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}; |
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|
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/** |
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* Sets the CMemoryMonitor object for this DLL. |
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* Only for use by CMemoryMonitor. |
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* @internal |
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*/ |
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IMPORT_C void SetGMemoryMonitorTls(CMemoryMonitor* aMonitor); |
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#endif // OOMMONITORPLUGIN_H |