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1 /* |
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2 * Copyright (c) 2009-2010 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 * Implementation of transaction handler. |
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16 * |
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17 */ |
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18 |
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19 |
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20 #ifndef CMMTRANSACTIONHANDLER_H_ |
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21 #define CMMTRANSACTIONHANDLER_H_ |
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22 |
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23 #include <e32base.h> |
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24 #include <metadatabase.h> |
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25 |
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26 |
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27 /** |
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28 * Transaction handler. |
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29 */ |
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30 NONSHARABLE_CLASS( CCmmTransactionHandler ) : public CBase |
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31 { |
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32 public: |
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33 /** |
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34 * NewL. |
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35 * Takes ownership of aDb. |
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36 */ |
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37 static CCmmTransactionHandler* NewL( CommsDat::CMDBSession& aDb ); |
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38 |
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39 /** |
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40 * Destructor. |
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41 * Intentionally not virtual. |
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42 */ |
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43 ~CCmmTransactionHandler(); |
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44 |
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45 private: |
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46 /** |
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47 * Constructor. |
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48 */ |
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49 CCmmTransactionHandler( CommsDat::CMDBSession& aDb ); |
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50 |
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51 /** |
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52 * Second phase constructor. Leaves on failure. |
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53 */ |
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54 void ConstructL(); |
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55 |
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56 public: |
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57 /** |
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58 * Return the CommsDat session. |
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59 */ |
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60 CommsDat::CMDBSession& Session() const; |
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61 |
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62 /** |
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63 * Opens a CommsDat transaction if it is not already open. Reference |
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64 * counter is inreased by one. |
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65 */ |
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66 void OpenTransactionLC(); |
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67 |
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68 /** |
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69 * Decreases the reference counter by one. If it reaches zero, commits the |
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70 * open CommsDat transaction. If an error code is given as argument, the |
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71 * CommsDat transaction is rolled back instead. |
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72 */ |
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73 void CommitTransactionL( TInt aError = KErrNone ); |
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74 |
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75 /** |
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76 * Performs RollbackTransactionL(). |
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77 */ |
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78 void Close(); |
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79 |
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80 /** |
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81 * Return the current reference count. Transaction is currently open if the |
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82 * count above 0. |
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83 */ |
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84 TUint32 GetReferenceCount(); |
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85 |
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86 private: |
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87 // CommsDat session pointer. |
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88 CommsDat::CMDBSession& iDb; // Owned. |
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89 |
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90 // Reference counter. |
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91 TUint32 iRefCount; |
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92 }; |
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93 |
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94 #endif // CMMTRANSACTIONHANDLER_H_ |
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95 |
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96 // End of file |