author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 10:12:00 +0200 | |
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child 1 | 0fdb7f6b0309 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2006 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: OOM Monitor plug-in interface. |
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* |
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*/ |
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#ifndef OOMMONITORPLUGIN_H |
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#define OOMMONITORPLUGIN_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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|
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/** |
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* Panic codes with category "OomMonitorPlugin" |
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*/ |
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enum TOomMonitorPluginPanic |
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{ |
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/** |
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* The plugin has been constructed by a thread other than the OOM monitor. |
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*/ |
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EOomMonitorPluginPanic_PluginConstructedOutsideOomMonitorThread |
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}; |
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|
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// Message type used to signal an OOM plug-in to free some memory. |
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const TInt KAppOomMonitor_FreeRam = 0x10282304; |
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|
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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 KAppOomMonitor_MemoryGood = 0x10282305; |
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class COomMonitorPlugin : 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 COomMonitorPlugin(); |
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/** |
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* Destructor |
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*/ |
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IMPORT_C ~COomMonitorPlugin(); |
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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() = 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() = 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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protected: |
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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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/** |
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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(CAppOomMonitorPlugin) : public COomMonitorPlugin |
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{ |
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public: |
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IMPORT_C static CAppOomMonitorPlugin* NewL(TUid aAppUid); |
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|
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private: |
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CAppOomMonitorPlugin(TUid aAppUid); |
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|
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void FreeRam(); |
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void MemoryGood(); |
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|
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void SendMessageToApp(TInt aMessage); |
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|
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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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/** |
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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 SetMemoryMonitorTls(CMemoryMonitor* aMonitor); |
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|
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|
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#endif // OOMMONITORPLUGIN_H |