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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 : #include <threadhelp/transactionmanager.hxx>
21 : #include <threadhelp/resetableguard.hxx>
22 : #include <macros/debug.hxx>
23 :
24 : #include <macros/generic.hxx>
25 : #include <fwidllapi.h>
26 :
27 : #include <com/sun/star/lang/DisposedException.hpp>
28 :
29 : namespace framework{
30 :
31 : /*-************************************************************************************************************//**
32 : @short standard ctor
33 : @descr Initialize instance with right start values for correct working.
34 :
35 : @seealso -
36 :
37 : @param -
38 : @return -
39 :
40 : @onerror -
41 : *//*-*************************************************************************************************************/
42 520 : TransactionManager::TransactionManager()
43 : : m_eWorkingMode ( E_INIT )
44 520 : , m_nTransactionCount ( 0 )
45 : {
46 520 : m_aBarrier.open();
47 520 : }
48 :
49 : /*-************************************************************************************************************//**
50 : @short standard dtor
51 : @descr -
52 :
53 : @seealso -
54 :
55 : @param -
56 : @return -
57 :
58 : @onerror -
59 : *//*-*************************************************************************************************************/
60 154 : TransactionManager::~TransactionManager()
61 : {
62 154 : }
63 :
64 : /*-****************************************************************************************************//**
65 : @interface ITransactionManager
66 : @short set new working mode
67 : @descr These implementation knows for states of working: E_INIT, E_WORK, E_CLOSING, E_CLOSE
68 : You can step during this ones only from the left to the right side and start at left side again!
69 : (This is neccessary e.g. for refcounted objects!)
70 : This call will block till all current existing transactions was finished.
71 : Follow results occure:
72 : E_INIT : All requests on this implementation are refused.
73 : It's your decision to react in a right way.
74 :
75 : E_WORK : The object can work now. The full functionality is available.
76 :
77 : E_BEFORECLOSE : The object start the closing mechanism ... but sometimes
78 : e.g. the dispose() method need to call some private methods.
79 : These some special methods should use E_SOFTEXCEPTIONS or ignore
80 : E_INCLOSE as returned reason for E_NOEXCEPTIONS to detect this special case!
81 :
82 : E_CLOSE : Object is already dead! All further requests will be refused.
83 : It's your decision to react in a right way.
84 :
85 : @seealso -
86 :
87 : @param "eMode", is the new mode - but we don't accept setting mode in wrong order!
88 : @return -
89 :
90 : @onerror We do nothing.
91 : *//*-*****************************************************************************************************/
92 426 : void TransactionManager::setWorkingMode( EWorkingMode eMode )
93 : {
94 : // Safe member access.
95 426 : ::osl::ClearableMutexGuard aAccessGuard( m_aAccessLock );
96 426 : sal_Bool bWaitFor = sal_False ;
97 : // Change working mode first!
98 426 : if (
99 : ( m_eWorkingMode == E_INIT && eMode == E_WORK ) ||
100 : ( m_eWorkingMode == E_WORK && eMode == E_BEFORECLOSE ) ||
101 : ( m_eWorkingMode == E_BEFORECLOSE && eMode == E_CLOSE ) ||
102 : ( m_eWorkingMode == E_CLOSE && eMode == E_INIT )
103 : )
104 : {
105 426 : m_eWorkingMode = eMode;
106 426 : if( m_eWorkingMode == E_BEFORECLOSE || m_eWorkingMode == E_CLOSE )
107 : {
108 166 : bWaitFor = sal_True;
109 : }
110 : }
111 :
112 : // Wait for current existing transactions then!
113 : // (Only neccessary for changing to E_BEFORECLOSE or E_CLOSE! ...
114 : // otherwise; if you wait at setting E_WORK another thrad could finish a acquire-call during our unlock() and wait() call
115 : // ... and we will wait forever here!!!)
116 : // Don't forget to release access mutex before.
117 426 : aAccessGuard.clear();
118 426 : if( bWaitFor == sal_True )
119 : {
120 166 : m_aBarrier.wait();
121 426 : }
122 426 : }
123 :
124 : /*-****************************************************************************************************//**
125 : @interface ITransactionManager
126 : @short get current working mode
127 : @descr If you stand in your close() or init() method ... but don't know
128 : if you called more then ones(!) ... you can use this function to get
129 : right information.
130 : e.g: You have a method init() which is used to change working mode from
131 : E_INIT to E_WORK and should be used to initialize some member too ...
132 : What should you do:
133 :
134 : void init( sal_Int32 nValue )
135 : {
136 : // Reject this call if our transaction manager say: "Object already initialized!"
137 : // Otherwise initialize your member.
138 : if( m_aTransactionManager.getWorkingMode() == E_INIT )
139 : {
140 : // Object is uninitialized ...
141 : // Make member access threadsafe!
142 : ResetableGuard aGuard( m_aMutex );
143 :
144 : // Check working mode again .. because anozï¿œther instance could be faster.
145 : // (It's possible to set this guard at first of this method too!)
146 : if( m_aTransactionManager.getWorkingMode() == E_INIT )
147 : {
148 : m_aMember = nValue;
149 :
150 : // Object is initialized now ... set working mode to E_WORK!
151 : m_aTransactionManager.setWorkingMode( E_WORK );
152 : }
153 : }
154 : }
155 :
156 : @seealso method setWorkingMode()
157 :
158 : @param -
159 : @return Current set mode.
160 :
161 : @onerror No error should occure.
162 : *//*-*****************************************************************************************************/
163 0 : EWorkingMode TransactionManager::getWorkingMode() const
164 : {
165 : // Synchronize access to internal member!
166 0 : ::osl::MutexGuard aAccessLock( m_aAccessLock );
167 0 : return m_eWorkingMode;
168 : }
169 :
170 : /*-****************************************************************************************************//**
171 : @interface ITransactionManager
172 : @short start new transaction
173 : @descr A guard should use this method to start a new transaction. He should looks for rejected
174 : calls to by using parameter eMode and eReason.
175 : If call was not rejected your transaction will be non breakable during releasing your transaction
176 : guard! BUT ... your code isn't threadsafe then! It's a transaction manager only ....
177 :
178 : @seealso method unregisterTransaction()
179 :
180 : @param "eMode" ,used to enable/disable throwing exceptions automaticly for rejected calls
181 : @param "eReason" ,reason for rejected calls if eMode=E_NOEXCEPTIONS
182 : @return -
183 :
184 : @onerror -
185 : *//*-*****************************************************************************************************/
186 78373 : void TransactionManager::registerTransaction( EExceptionMode eMode, ERejectReason& eReason ) throw( css::uno::RuntimeException, css::lang::DisposedException )
187 : {
188 : // Look for rejected calls first.
189 : // If call was refused we throw some exceptions or do nothing!
190 : // It depends from given parameter eMode.
191 78373 : if( isCallRejected( eReason ) == sal_True )
192 : {
193 1704 : impl_throwExceptions( eMode, eReason );
194 : }
195 :
196 : // BUT if no exception was thrown ... (may be eMode = E_SOFTEXCEPTIONS!)
197 : // we must register this transaction too!
198 : // Don't use "else" or a new scope here!!!
199 :
200 : // Safe access to internal member.
201 78373 : ::osl::MutexGuard aAccessGuard( m_aAccessLock );
202 :
203 : #ifdef ENABLE_MUTEXDEBUG
204 : LOG_ASSERT2( m_nTransactionCount<0, "TransactionManager::acquire()", "Wrong ref count detected!" )
205 : #endif
206 :
207 : // Register this new transaction.
208 : // If it is the first one .. close gate to disable changing of working mode.
209 78373 : ++m_nTransactionCount;
210 78373 : if( m_nTransactionCount == 1 )
211 : {
212 58571 : m_aBarrier.close();
213 78373 : }
214 78373 : }
215 :
216 : /*-****************************************************************************************************//**
217 : @interface ITransactionManager
218 : @short finish transaction
219 : @descr A guard should call this method to release current transaction.
220 :
221 : @seealso method registerTransaction()
222 :
223 : @param -
224 : @return -
225 :
226 : @onerror -
227 : *//*-*****************************************************************************************************/
228 78373 : void TransactionManager::unregisterTransaction() throw( css::uno::RuntimeException, css::lang::DisposedException )
229 : {
230 : // This call could not rejected!
231 : // Safe access to internal member.
232 78373 : ::osl::MutexGuard aAccessGuard( m_aAccessLock );
233 :
234 : #ifdef ENABLE_MUTEXDEBUG
235 : LOG_ASSERT2( m_nTransactionCount<=0, "TransactionManager::release()", "Wrong ref count detected!" )
236 : #endif
237 :
238 : // Deregister this transaction.
239 : // If it was the last one ... open gate to enable changing of working mode!
240 : // (see setWorkingMode())
241 :
242 78373 : --m_nTransactionCount;
243 78373 : if( m_nTransactionCount == 0 )
244 : {
245 58571 : m_aBarrier.open();
246 78373 : }
247 78373 : }
248 :
249 : /*-****************************************************************************************************//**
250 : @interface ITransactionManager
251 : @short look for rejected calls
252 : @descr Sometimes user need a possibility to get information about rejected calls
253 : without starting a transaction!
254 :
255 : @seealso -
256 :
257 : @param "eReason" returns reason of a rejected call
258 : @return true if call was rejected, false otherwise
259 :
260 : @onerror We return false.
261 : *//*-*****************************************************************************************************/
262 78373 : sal_Bool TransactionManager::isCallRejected( ERejectReason& eReason ) const
263 : {
264 : // This call must safe access to internal member only.
265 : // Set "possible reason" for return and check reject-state then!
266 : // User should look for return value first - reason then ...
267 78373 : ::osl::MutexGuard aAccessGuard( m_aAccessLock );
268 78373 : switch( m_eWorkingMode )
269 : {
270 1680 : case E_INIT : eReason = E_UNINITIALIZED ;
271 1680 : break;
272 76669 : case E_WORK : eReason = E_NOREASON ;
273 76669 : break;
274 24 : case E_BEFORECLOSE : eReason = E_INCLOSE ;
275 24 : break;
276 0 : case E_CLOSE : eReason = E_CLOSED ;
277 0 : break;
278 : }
279 78373 : return( eReason!=E_NOREASON );
280 : }
281 :
282 : /*-****************************************************************************************************//**
283 : @short throw any exceptions for rejected calls
284 : @descr If user whish to use our automaticly exception mode we use this impl-method.
285 : We check all combinations of eReason and eExceptionMode and throw right exception with some
286 : descriptions for recipient of it.
287 :
288 : @seealso method registerTransaction()
289 : @seealso enum ERejectReason
290 : @seealso enum EExceptionMode
291 :
292 : @param "eReason" , reason for rejected call
293 : @param "eMode" , exception mode - set by user
294 : @return -
295 :
296 : @onerror -
297 : *//*-*****************************************************************************************************/
298 1704 : void TransactionManager::impl_throwExceptions( EExceptionMode eMode, ERejectReason eReason ) const throw( css::uno::RuntimeException, css::lang::DisposedException )
299 : {
300 1704 : if( eMode != E_NOEXCEPTIONS )
301 : {
302 1704 : switch( eReason )
303 : {
304 : case E_UNINITIALIZED : if( eMode == E_HARDEXCEPTIONS )
305 : {
306 : // Help programmer to find out, why this exception is thrown!
307 : LOG_ERROR( "TransactionManager...", "Owner instance not right initialized yet. Call was rejected! Normaly it's an algorithm error ... wrong usin of class!" )
308 : //ATTENTION: temp. disabled - till all bad code positions are detected and changed! */
309 : // 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 >() );
310 : }
311 1680 : break;
312 24 : case E_INCLOSE : if( eMode == E_HARDEXCEPTIONS )
313 : {
314 : // Help programmer to find out, why this exception is thrown!
315 : LOG_ERROR( "TransactionManager...", "Owner instance stand in close method. Call was rejected!" )
316 0 : throw css::lang::DisposedException( DECLARE_ASCII("TransactionManager...\nOwner instance stand in close method. Call was rejected!\n" ), css::uno::Reference< css::uno::XInterface >() );
317 : }
318 24 : break;
319 : case E_CLOSED : {
320 : // Help programmer to find out, why this exception is thrown!
321 : LOG_ERROR( "TransactionManager...", "Owner instance already closed. Call was rejected!" )
322 0 : throw css::lang::DisposedException( DECLARE_ASCII("TransactionManager...\nOwner instance already closed. Call was rejected!\n" ), css::uno::Reference< css::uno::XInterface >() );
323 : }
324 : case E_NOREASON : {
325 : // Help programmer to find out
326 : LOG_ERROR( "TransactionManager...", "Impossible case E_NOREASON!" )
327 : }
328 0 : break;
329 0 : default: break; // nothing to do
330 : }
331 : }
332 1704 : }
333 :
334 : } // namespace framework
335 :
336 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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