/************************************************************************* * * OpenOffice.org - a multi-platform office productivity suite * * $RCSfile: transactionmanager.cxx,v $ * * $Revision: 1.9 $ * * last change: $Author: obo $ $Date: 2006-09-16 14:14:35 $ * * The Contents of this file are made available subject to * the terms of GNU Lesser General Public License Version 2.1. * * * GNU Lesser General Public License Version 2.1 * ============================================= * Copyright 2005 by Sun Microsystems, Inc. * 901 San Antonio Road, Palo Alto, CA 94303, USA * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License version 2.1, as published by the Free Software Foundation. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA * ************************************************************************/ // MARKER(update_precomp.py): autogen include statement, do not remove #include "precompiled_framework.hxx" //_________________________________________________________________________________________________________________ // my own includes //_________________________________________________________________________________________________________________ #ifndef __FRAMEWORK_THREADHELP_TRANSACTIONMANAGER_HXX_ #include #endif #ifndef __FRAMEWORK_THREADHELP_RESETABLEGUARD_HXX_ #include #endif #ifndef __FRAMEWORK_MACROS_DEBUG_HXX_ #include #endif //_________________________________________________________________________________________________________________ // interface includes //_________________________________________________________________________________________________________________ //_________________________________________________________________________________________________________________ // other includes //_________________________________________________________________________________________________________________ //_________________________________________________________________________________________________________________ // const //_________________________________________________________________________________________________________________ //_________________________________________________________________________________________________________________ // namespace //_________________________________________________________________________________________________________________ namespace framework{ //_________________________________________________________________________________________________________________ // non exported const //_________________________________________________________________________________________________________________ //_________________________________________________________________________________________________________________ // non exported declarations //_________________________________________________________________________________________________________________ //_________________________________________________________________________________________________________________ // definitions //_________________________________________________________________________________________________________________ /*-************************************************************************************************************//** @short standard ctor @descr Initialize instance with right start values for correct working. @seealso - @param - @return - @onerror - *//*-*************************************************************************************************************/ TransactionManager::TransactionManager() : m_eWorkingMode ( E_INIT ) , m_nTransactionCount ( 0 ) { m_aBarrier.open(); } /*-************************************************************************************************************//** @short standard dtor @descr - @seealso - @param - @return - @onerror - *//*-*************************************************************************************************************/ TransactionManager::~TransactionManager() { } /*-****************************************************************************************************//** @interface ITransactionManager @short set new working mode @descr These implementation knows for states of working: E_INIT, E_WORK, E_CLOSING, E_CLOSE You can step during this ones only from the left to the right side and start at left side again! (This is neccessary e.g. for refcounted objects!) This call will block till all current existing transactions was finished. Follow results occure: E_INIT : All requests on this implementation are refused. It's your decision to react in a right way. E_WORK : The object can work now. The full functionality is available. E_BEFORECLOSE : The object start the closing mechanism ... but sometimes e.g. the dispose() method need to call some private methods. These some special methods should use E_SOFTEXCEPTIONS or ignore E_INCLOSE as returned reason for E_NOEXCEPTIONS to detect this special case! E_CLOSE : Object is already dead! All further requests will be refused. It's your decision to react in a right way. @seealso - @param "eMode", is the new mode - but we don't accept setting mode in wrong order! @return - @onerror We do nothing. *//*-*****************************************************************************************************/ void TransactionManager::setWorkingMode( EWorkingMode eMode ) { // Safe member access. ::osl::ClearableMutexGuard aAccessGuard( m_aAccessLock ); sal_Bool bWaitFor = sal_False ; // Change working mode first! if ( ( m_eWorkingMode == E_INIT && eMode == E_WORK ) || ( m_eWorkingMode == E_WORK && eMode == E_BEFORECLOSE ) || ( m_eWorkingMode == E_BEFORECLOSE && eMode == E_CLOSE ) || ( m_eWorkingMode == E_CLOSE && eMode == E_INIT ) ) { m_eWorkingMode = eMode; if( m_eWorkingMode == E_BEFORECLOSE || m_eWorkingMode == E_CLOSE ) { bWaitFor = sal_True; } } // Wait for current existing transactions then! // (Only neccessary for changing to E_BEFORECLOSE or E_CLOSE! ... // otherwise; if you wait at setting E_WORK another thrad could finish a acquire-call during our unlock() and wait() call // ... and we will wait forever here!!!) // Don't forget to release access mutex before. aAccessGuard.clear(); if( bWaitFor == sal_True ) { m_aBarrier.wait(); } } /*-****************************************************************************************************//** @interface ITransactionManager @short get current working mode @descr If you stand in your close() or init() method ... but don't know if you called more then ones(!) ... you can use this function to get right information. e.g: You have a method init() which is used to change working mode from E_INIT to E_WORK and should be used to initialize some member too ... What should you do: void init( sal_Int32 nValue ) { // Reject this call if our transaction manager say: "Object already initialized!" // Otherwise initialize your member. if( m_aTransactionManager.getWorkingMode() == E_INIT ) { // Object is uninitialized ... // Make member access threadsafe! ResetableGuard aGuard( m_aMutex ); // Check working mode again .. because anoz�ther instance could be faster. // (It's possible to set this guard at first of this method too!) if( m_aTransactionManager.getWorkingMode() == E_INIT ) { m_aMember = nValue; // Object is initialized now ... set working mode to E_WORK! m_aTransactionManager.setWorkingMode( E_WORK ); } } } @seealso method setWorkingMode() @param - @return Current set mode. @onerror No error should occure. *//*-*****************************************************************************************************/ EWorkingMode TransactionManager::getWorkingMode() const { // Synchronize access to internal member! ::osl::MutexGuard aAccessLock( m_aAccessLock ); return m_eWorkingMode; } /*-****************************************************************************************************//** @interface ITransactionManager @short start new transaction @descr A guard should use this method to start a new transaction. He should looks for rejected calls to by using parameter eMode and eReason. If call was not rejected your transaction will be non breakable during releasing your transaction guard! BUT ... your code isn't threadsafe then! It's a transaction manager only .... @seealso method unregisterTransaction() @param "eMode" ,used to enable/disable throwing exceptions automaticly for rejected calls @param "eReason" ,reason for rejected calls if eMode=E_NOEXCEPTIONS @return - @onerror - *//*-*****************************************************************************************************/ void TransactionManager::registerTransaction( EExceptionMode eMode, ERejectReason& eReason ) throw( css::uno::RuntimeException, css::lang::DisposedException ) { // Look for rejected calls first. // If call was refused we throw some exceptions or do nothing! // It depends from given parameter eMode. if( isCallRejected( eReason ) == sal_True ) { impl_throwExceptions( eMode, eReason ); } // BUT if no exception was thrown ... (may be eMode = E_SOFTEXCEPTIONS!) // we must register this transaction too! // Don't use "else" or a new scope here!!! // Safe access to internal member. ::osl::MutexGuard aAccessGuard( m_aAccessLock ); #ifdef ENABLE_MUTEXDEBUG LOG_ASSERT2( m_nTransactionCount<0, "TransactionManager::acquire()", "Wrong ref count detected!" ) #endif // Register this new transaction. // If it is the first one .. close gate to disable changing of working mode. ++m_nTransactionCount; if( m_nTransactionCount == 1 ) { m_aBarrier.close(); } } /*-****************************************************************************************************//** @interface ITransactionManager @short finish transaction @descr A guard should call this method to release current transaction. @seealso method registerTransaction() @param - @return - @onerror - *//*-*****************************************************************************************************/ void TransactionManager::unregisterTransaction() throw( css::uno::RuntimeException, css::lang::DisposedException ) { // This call could not rejected! // Safe access to internal member. ::osl::MutexGuard aAccessGuard( m_aAccessLock ); #ifdef ENABLE_MUTEXDEBUG LOG_ASSERT2( m_nTransactionCount<=0, "TransactionManager::release()", "Wrong ref count detected!" ) #endif // Deregister this transaction. // If it was the last one ... open gate to enable changing of working mode! // (see setWorkingMode()) --m_nTransactionCount; if( m_nTransactionCount == 0 ) { m_aBarrier.open(); } } /*-****************************************************************************************************//** @interface ITransactionManager @short look for rejected calls @descr Sometimes user need a possibility to get information about rejected calls without starting a transaction! @seealso - @param "eReason" returns reason of a rejected call @return true if call was rejected, false otherwise @onerror We return false. *//*-*****************************************************************************************************/ sal_Bool TransactionManager::isCallRejected( ERejectReason& eReason ) const { // This call must safe access to internal member only. // Set "possible reason" for return and check reject-state then! // User should look for return value first - reason then ... ::osl::MutexGuard aAccessGuard( m_aAccessLock ); switch( m_eWorkingMode ) { case E_INIT : eReason = E_UNINITIALIZED ; break; case E_WORK : eReason = E_NOREASON ; break; case E_BEFORECLOSE : eReason = E_INCLOSE ; break; case E_CLOSE : eReason = E_CLOSED ; break; } return( eReason!=E_NOREASON ); } /*-****************************************************************************************************//** @short return a reference to a static manager @descr Sometimes we need the global member! (e.g. in our own static methods) We create our own "class global static" member threadsafe. It will be created at first call only! All other requests use these created one then directly. @seealso - @param - @return A reference to a static member. @onerror No error should occure. *//*-*****************************************************************************************************/ TransactionManager& TransactionManager::getGlobalTransactionManager() { // Initialize static member only for one time! static TransactionManager* pManager = NULL; // If these method first called (member not already exist!) ... if( pManager == NULL ) { // ... we must create a new one. Protect follow code with the global mutex - // It must be - we create a static variable! ::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex() ); // We must check our pointer again - because ... another instance of ouer class could be faster then these one! if( pManager == NULL ) { // Create the new manager and set it for return on static variable. static TransactionManager aManager; pManager = &aManager; } } // Return new created or already existing object. return *pManager; } /*-****************************************************************************************************//** @short throw any exceptions for rejected calls @descr If user whish to use our automaticly exception mode we use this impl-method. We check all combinations of eReason and eExceptionMode and throw right exception with some descriptions for recipient of it. @seealso method registerTransaction() @seealso enum ERejectReason @seealso enum EExceptionMode @param "eReason" , reason for rejected call @param "eMode" , exception mode - set by user @return - @onerror - *//*-*****************************************************************************************************/ void TransactionManager::impl_throwExceptions( EExceptionMode eMode, ERejectReason eReason ) const throw( css::uno::RuntimeException, css::lang::DisposedException ) { if( eMode != E_NOEXCEPTIONS ) { switch( eReason ) { case E_UNINITIALIZED : if( eMode == E_HARDEXCEPTIONS ) { // Help programmer to find out, why this exception is thrown! LOG_ERROR( "TransactionManager...", "Owner instance not right initialized yet. Call was rejected! Normaly it's an algorithm error ... wrong usin of class!" ) //ATTENTION: temp. disabled - till all bad code positions are detected and changed! */ // throw css::uno::RuntimeException( DECLARE_ASCII("TransactionManager...\nOwner instance not right initialized yet. Call was rejected! Normaly it's an algorithm error ... wrong usin of class!\n" ), css::uno::Reference< css::uno::XInterface >() ); } break; case E_INCLOSE : if( eMode == E_HARDEXCEPTIONS ) { // Help programmer to find out, why this exception is thrown! LOG_ERROR( "TransactionManager...", "Owner instance stand in close method. Call was rejected!" ) throw css::lang::DisposedException( DECLARE_ASCII("TransactionManager...\nOwner instance stand in close method. Call was rejected!\n" ), css::uno::Reference< css::uno::XInterface >() ); } break; case E_CLOSED : { // Help programmer to find out, why this exception is thrown! LOG_ERROR( "TransactionManager...", "Owner instance already closed. Call was rejected!" ) throw css::lang::DisposedException( DECLARE_ASCII("TransactionManager...\nOwner instance already closed. Call was rejected!\n" ), css::uno::Reference< css::uno::XInterface >() ); } case E_NOREASON : { // Help programmer to find out LOG_ERROR( "TransactionManager...", "Impossible case E_NOREASON!" ) } break; default: break; // nothing to do } } } } // namespace framework