LCOV - code coverage report
Current view: top level - framework/inc/threadhelp - transactionguard.hxx (source / functions) Hit Total Coverage
Test: commit c8344322a7af75b84dd3ca8f78b05543a976dfd5 Lines: 13 14 92.9 %
Date: 2015-06-13 12:38:46 Functions: 3 3 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONGUARD_HXX
      21             : #define INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONGUARD_HXX
      22             : 
      23             : #include <boost/noncopyable.hpp>
      24             : #include <threadhelp/transactionmanager.hxx>
      25             : 
      26             : namespace framework{
      27             : 
      28             : /*-************************************************************************************************************
      29             :     @short          implement a guard to support non breakable transactions
      30             :     @descr          If you wish to support non breakable method calls without lockingf any mutex, rw-lock or
      31             :                     something like that - you should use this guard implementation.
      32             :                     Initialize it at first in your method and don't release it till end of your function!
      33             :                     Your "transaction" is registered in ctor and automatically released in dtor.
      34             :                     Use set/get of working mode to enable/disable further transactions.
      35             :                     It's possible too, to enable automatically throwing of some exceptions for illegal
      36             :                     transaction requests ... e.g. interface call for already disposed objects.
      37             : 
      38             :     @attention      To prevent us against wrong using, the default ctor, copy ctor and the =operator are marked private!
      39             :     @devstatus      draft
      40             : *//*-*************************************************************************************************************/
      41             : class TransactionGuard : private boost::noncopyable
      42             : {
      43             : 
      44             :     //  public methods
      45             : 
      46             :     public:
      47             : 
      48             :         /*-****************************************************************************************************
      49             :             @short      ctors
      50             :             @descr      Use these ctor methods to initialize the guard right.
      51             :                         Given reference must be valid - otherwise crashes could occur!
      52             : 
      53             :             @attention  It's not necessary to lock any mutex here! Because a ctor should not be called
      54             :                         from different threads at the same time ... this class use no refcount mechanism!
      55             :             @param      "rManager"  reference to transaction manager for using to register a request
      56             :             @param      "eMode"     enable/disable throwing of exceptions for rejected calls
      57             :             @param      "eReason"   returns reason for rejected calls
      58             :         *//*-*****************************************************************************************************/
      59     1126176 :         inline TransactionGuard( TransactionManager& rManager, EExceptionMode eMode, ERejectReason* eReason = NULL )
      60     1126176 :             : m_pManager( &rManager )
      61             :         {
      62             :             // If exception mode is set to E_HARDEXCETIONS we don't need a buffer to return reason!
      63             :             // We handle it private. If a call is rejected, our manager throw some exceptions ... and the reason
      64             :             // could be ignorable ...
      65     1126176 :             if( eReason == NULL )
      66             :             {
      67             :                 ERejectReason eMyReason;
      68     1126176 :                 m_pManager->registerTransaction( eMode, eMyReason );
      69             :             }
      70             :             else
      71             :             {
      72           0 :                 m_pManager->registerTransaction( eMode, *eReason );
      73             :             }
      74     1126167 :         }
      75             : 
      76             :         /*-************************************************************************************************************
      77             :             @short      dtor
      78             :             @descr      We must release the transaction manager and can forget his pointer.
      79             :         *//*-*************************************************************************************************************/
      80     1126167 :         inline ~TransactionGuard()
      81             :         {
      82     1126167 :             stop();
      83     1126167 :         }
      84             : 
      85             :         /*-************************************************************************************************************
      86             :             @short      stop current transaction
      87             :             @descr      We must release the transaction manager and can forget his pointer.
      88             : 
      89             :             @attention  We don't support any start() method here - because it is not easy to
      90             :                         detect if a transaction already started or not!
      91             :                         (combination of EExceptionMode and ERejectReason)
      92             :         *//*-*************************************************************************************************************/
      93     1129649 :         inline void stop()
      94             :         {
      95     1129649 :             if( m_pManager != NULL )
      96             :             {
      97     1126167 :                 m_pManager->unregisterTransaction();
      98     1126167 :                 m_pManager = NULL;
      99             :             }
     100     1129649 :         }
     101             : 
     102             : 
     103             :     private:
     104             : 
     105             :         /*-****************************************************************************************************
     106             :             @short      disable using of these functions!
     107             :             @descr      It's not allowed to use this methods. Different problem can occur otherwise.
     108             :                         Thats why we disable it by make it private.
     109             : 
     110             :             @seealso    other ctor
     111             :         *//*-*****************************************************************************************************/
     112             :         TransactionGuard();
     113             : 
     114             :     //  private member
     115             : 
     116             :     private:
     117             : 
     118             :         TransactionManager*   m_pManager;   /// pointer to safed transaction manager
     119             : 
     120             : };      //  class TransactionGuard
     121             : 
     122             : }       //  namespace framework
     123             : 
     124             : #endif // INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONGUARD_HXX
     125             : 
     126             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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