2633d5f97f
See tdf#42949 for motivation Change-Id: Ifc253bf800bb1468b5774663a93f4fb30bec81d3 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113657 Tested-by: Jenkins Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
123 lines
7.1 KiB
C++
123 lines
7.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
|
|
/*
|
|
* This file is part of the LibreOffice project.
|
|
*
|
|
* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
*
|
|
* This file incorporates work covered by the following license notice:
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed
|
|
* with this work for additional information regarding copyright
|
|
* ownership. The ASF licenses this file to you under the Apache
|
|
* License, Version 2.0 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <osl/mutex.hxx>
|
|
|
|
#include "gate.hxx"
|
|
|
|
namespace framework{
|
|
|
|
/*-************************************************************************************************************
|
|
@descr Describe different states of a feature of following implementation.
|
|
During lifetime of an object different working states occur:
|
|
initialization - working - closing - closed
|
|
If you wish to implement thread safe classes you should use this feature to protect
|
|
your code against calls at wrong time. e.g. you are not full initialized but somewhere
|
|
call an interface method (initialize phase means startup time from creating object till
|
|
calling specified first method e.g. XInitialization::initialize()!) then you should refuse
|
|
this call. The same for closing/disposing the object!
|
|
*//*-*************************************************************************************************************/
|
|
enum EWorkingMode
|
|
{
|
|
E_INIT , // We stand in an init method -> some calls are accepted - some ones are rejected
|
|
E_WORK , // Object is ready for working -> all calls are accepted
|
|
E_BEFORECLOSE, // We stand in a close method -> some calls are accepted - some ones are rejected
|
|
E_CLOSE // Object is dead! -> all calls are rejected!
|
|
};
|
|
|
|
/*-************************************************************************************************************
|
|
@descr A transaction object should support throwing exceptions if user used it at wrong working mode.
|
|
e.g. We can throw a DisposedException if user try to work and our mode is E_CLOSE!
|
|
But sometimes he doesn't need this feature - will handle it by himself.
|
|
Then we must differ between some exception-modi:
|
|
E_HARDEXCEPTIONS We throw exceptions for all working modes different from E_WORK!
|
|
E_SOFTEXCEPTIONS We throw exceptions for all working modes different from E_WORK AND E_INCLOSE!
|
|
This mode is useful for impl-methods which should be callable from dispose() method!
|
|
|
|
e.g. void dispose()
|
|
{
|
|
m_aTransactionManager.setWorkingMode( E_BEFORECLOSE );
|
|
...
|
|
impl_setA( 0 );
|
|
...
|
|
m_aTransactionManager.setWorkingMode( E_CLOSE );
|
|
}
|
|
|
|
void impl_setA( int nA )
|
|
{
|
|
ERejectReason EReason;
|
|
TransactionGuard aTransactionGuard( m_aTransactionManager, E_SOFTEXCEPTIONS, eReason );
|
|
|
|
m_nA = nA;
|
|
}
|
|
|
|
Normally (if E_HARDEXCEPTIONS was used!) creation of guard
|
|
will throw an exception ... but using of E_SOFTEXCEPTIONS suppress it
|
|
and member "A" can be set.
|
|
*//*-*************************************************************************************************************/
|
|
enum EExceptionMode
|
|
{
|
|
E_HARDEXCEPTIONS,
|
|
E_SOFTEXCEPTIONS
|
|
};
|
|
|
|
/*-************************************************************************************************************
|
|
@short implement a transaction manager to support non breakable interface methods
|
|
@descr Use it to support non breakable interface methods without using any thread
|
|
synchronization like e.g. mutex, rw-lock!
|
|
That protect your code against wrong calls at wrong time ... e.g. calls after disposing an object!
|
|
Use combination of EExceptionMode and ERejectReason to detect rejected requests
|
|
and react for it. You can enable automatically throwing of exceptions too.
|
|
|
|
@devstatus draft
|
|
*//*-*************************************************************************************************************/
|
|
class TransactionManager
|
|
{
|
|
|
|
// public methods
|
|
|
|
public:
|
|
|
|
TransactionManager ( );
|
|
~TransactionManager ( );
|
|
TransactionManager(const TransactionManager&) = delete;
|
|
TransactionManager& operator=(const TransactionManager&) = delete;
|
|
void setWorkingMode ( EWorkingMode eMode );
|
|
EWorkingMode getWorkingMode ( ) const;
|
|
/// @throws css::uno::RuntimeException
|
|
/// @throws css::lang::DisposedException
|
|
void registerTransaction ( EExceptionMode eMode );
|
|
/// @throws css::uno::RuntimeException
|
|
/// @throws css::lang::DisposedException
|
|
void unregisterTransaction ( );
|
|
|
|
private:
|
|
|
|
mutable ::osl::Mutex m_aAccessLock; /// regulate access on internal member of this instance
|
|
Gate m_aBarrier; /// used to block transactions requests during change or work mode
|
|
EWorkingMode m_eWorkingMode; /// current working mode of object which use this manager (used to reject calls at wrong time)
|
|
sal_Int32 m_nTransactionCount; /// every transaction request is registered by this counter
|
|
|
|
}; // class TransactionManager
|
|
|
|
} // namespace framework
|
|
|
|
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|