1 /* |
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2 * Copyright (c) 2002-2006 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 |
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19 #ifndef GSPLUGINWRAPPER_H |
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20 #define GSPLUGINWRAPPER_H |
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21 |
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22 // System includes |
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23 #include <e32base.h> |
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24 |
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25 // Classes referenced |
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26 class CGSBaseDocument; |
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27 |
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28 |
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29 /** |
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30 * Utility class for separating ECOM plugin destruction from view-framework |
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31 * view cleanup. |
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32 * |
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33 * Owned by CGSBaseDocument which has the longest lifetime during GS |
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34 * application run. This will ensure that ECOM resources are not deleted |
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35 * before view cleanup. |
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36 * |
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37 * Problem/rationale: |
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38 * Before the functionality provided by this class, GS would occasionally |
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39 * crash in exit. This was caused by the dual nature of CGSPluginInterface |
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40 * class: It is both ECOM-plugin having individual dll and view-framework |
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41 * dependant CAknView owned by CCoeAppUi. When exiting GS, it was possible |
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42 * that a plugin still had local views (CAknViews) which were owned |
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43 * by view-framework. |
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44 * |
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45 * When the view framework destroys the registered views, it would cause |
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46 * the ECOM plugin dll to be unloaded. Should this happen before all the views |
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47 * owned and implemented by the plugin have been destroyed, an access |
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48 * violation would occur because the code needed to call the view's destructor |
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49 * was no longer loaded into memory within the GS process. |
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50 * |
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51 * Solution: |
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52 * Purpose of CGSPluginWrapper is to move ECOM-related memory cleanup outside |
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53 * the scope of CGSPluginInterface destructor. This way view-framework can |
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54 * call destructor in an arbitrary order on all it's owned views even though |
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55 * plugins which had local views were already deleted. |
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56 * |
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57 */ |
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58 NONSHARABLE_CLASS( CGSPluginWrapper ) : public CBase |
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59 { |
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60 public: |
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61 CGSPluginWrapper( CGSBaseDocument& aDocument ); |
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62 IMPORT_C ~CGSPluginWrapper(); |
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63 |
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64 public: |
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65 IMPORT_C void SetDetails( TUid aDestructorIdKey ); |
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66 inline CGSBaseDocument& Document() { return iDocument; } |
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67 |
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68 private: |
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69 TUid iDestructorIdKey; |
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70 CGSBaseDocument& iDocument; |
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71 }; |
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72 |
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73 |
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74 |
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75 |
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76 #endif // GSPLUGINWRAPPER_H |
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77 // End of File |
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