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-rw-r--r--framework/inc/threadhelp/gate.hxx149
-rw-r--r--framework/inc/threadhelp/transactionguard.hxx51
-rw-r--r--framework/inc/threadhelp/transactionmanager.hxx128
3 files changed, 328 insertions, 0 deletions
diff --git a/framework/inc/threadhelp/gate.hxx b/framework/inc/threadhelp/gate.hxx
new file mode 100644
index 000000000..627a3a7cb
--- /dev/null
+++ b/framework/inc/threadhelp/gate.hxx
@@ -0,0 +1,149 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_FRAMEWORK_INC_THREADHELP_GATE_HXX
+#define INCLUDED_FRAMEWORK_INC_THREADHELP_GATE_HXX
+
+#include <osl/mutex.hxx>
+#include <osl/conditn.hxx>
+
+namespace framework{
+
+/*-************************************************************************************************************
+ @short implement a gate to block multiple threads at the same time or unblock all
+ @descr A gate can be used as a negative-condition! You can open a "door" - wait() will not block ...
+ or you can close it - wait() blocks till open() is called again.
+ Then all currently waiting threads are running immediately - but new ones are blocked!
+
+ @attention To prevent us against wrong using, the default ctor, copy ctor and the =operator are marked private!
+
+ @devstatus ready to use
+*//*-*************************************************************************************************************/
+class Gate
+{
+
+ // public methods
+
+ public:
+
+ /*-****************************************************************************************************
+ @short ctor
+ @descr These initialize the object right as an open gate.
+ *//*-*****************************************************************************************************/
+ Gate()
+ : m_bClosed ( false )
+ {
+ open();
+ }
+
+ /*-****************************************************************************************************
+ @short dtor
+ @descr Is user forget it - we open the gate ...
+ blocked threads can running ... but I don't know
+ if it's right - we are destroyed yet!?
+ *//*-*****************************************************************************************************/
+ ~Gate()
+ {
+ open();
+ }
+ /*-****************************************************************************************************
+ @short copy-ctor
+ @descr Forbid copy construction
+ *//*-*****************************************************************************************************/
+ Gate(const Gate&) = delete;
+ /*-****************************************************************************************************
+ @short copy-assignment
+ @descr Forbid copy assigning
+ *//*-*****************************************************************************************************/
+ Gate& operator=(const Gate&) = delete;
+
+ /*-****************************************************************************************************
+ @short open the gate
+ @descr A wait() call will not block then.
+
+ @seealso method close()
+ *//*-*****************************************************************************************************/
+ void open()
+ {
+ // We must safe access to our internal member!
+ ::osl::MutexGuard aLock( m_aAccessLock );
+ // Set condition -> wait don't block any longer -> gate is open
+ m_aPassage.set();
+ // Check if operation was successful!
+ // Check returns false if condition isn't set => m_bClosed will be true then => we must return false; opening failed
+ m_bClosed = !m_aPassage.check();
+ }
+
+ /*-****************************************************************************************************
+ @short close the gate
+ @descr A wait() call will block then.
+
+ @seealso method open()
+ *//*-*****************************************************************************************************/
+ void close()
+ {
+ // We must safe access to our internal member!
+ ::osl::MutexGuard aLock( m_aAccessLock );
+ // Reset condition -> wait blocks now -> gate is closed
+ m_aPassage.reset();
+ // Check if operation was successful!
+ // Check returns false if condition was reset => m_bClosed will be true then => we can return true; closing ok
+ m_bClosed = !m_aPassage.check();
+ }
+
+ /*-****************************************************************************************************
+ @short must be called to pass the gate
+ @descr If gate "open" => wait() will not block.
+ If gate "closed" => wait() will block till somewhere open it again.
+
+ @seealso method wait()
+ @seealso method open()
+
+ *//*-*****************************************************************************************************/
+ void wait()
+ {
+ // We must safe access to our internal member!
+ ::osl::ClearableMutexGuard aLock( m_aAccessLock );
+ // If gate not closed - caller can pass it.
+ if( m_bClosed )
+ {
+ // Then we must release used access lock -
+ // because next call will block...
+ // and if we hold the access lock nobody else can use this object without a deadlock!
+ aLock.clear();
+ // Wait for opening gate...
+ m_aPassage.wait();
+ }
+ }
+
+ // private member
+
+ private:
+
+ ::osl::Mutex m_aAccessLock;
+ ::osl::Condition m_aPassage;
+ bool m_bClosed;
+
+}; // class Gate
+
+} // namespace framework
+
+#endif // INCLUDED_FRAMEWORK_INC_THREADHELP_GATE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/framework/inc/threadhelp/transactionguard.hxx b/framework/inc/threadhelp/transactionguard.hxx
new file mode 100644
index 000000000..2c4366cde
--- /dev/null
+++ b/framework/inc/threadhelp/transactionguard.hxx
@@ -0,0 +1,51 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONGUARD_HXX
+#define INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONGUARD_HXX
+
+#include <threadhelp/transactionmanager.hxx>
+
+namespace framework{
+
+class TransactionGuard
+{
+ public:
+ TransactionGuard( TransactionManager& rManager, EExceptionMode eMode )
+ : m_pManager( &rManager )
+ {
+ m_pManager->registerTransaction( eMode );
+ }
+
+ ~TransactionGuard()
+ {
+ m_pManager->unregisterTransaction();
+ }
+ TransactionGuard(const TransactionGuard&) = delete;
+ TransactionGuard& operator=(const TransactionGuard&) = delete;
+
+ private:
+ TransactionManager* m_pManager;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/framework/inc/threadhelp/transactionmanager.hxx b/framework/inc/threadhelp/transactionmanager.hxx
new file mode 100644
index 000000000..9dbdc3b38
--- /dev/null
+++ b/framework/inc/threadhelp/transactionmanager.hxx
@@ -0,0 +1,128 @@
+/* -*- 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 .
+ */
+
+#ifndef INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONMANAGER_HXX
+#define INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONMANAGER_HXX
+
+#include <config_options.h>
+#include <threadhelp/gate.hxx>
+
+#include <osl/mutex.hxx>
+#include <fwidllapi.h>
+
+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 UNLESS_MERGELIBS(FWI_DLLPUBLIC) 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
+
+#endif // INCLUDED_FRAMEWORK_INC_THREADHELP_TRANSACTIONMANAGER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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