1 // Copyright (C) 2007-2012 CEA/DEN, EDF R&D, OPEN CASCADE
3 // Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
4 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
6 // This library is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU Lesser General Public
8 // License as published by the Free Software Foundation; either
9 // version 2.1 of the License.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // Lesser General Public License for more details.
16 // You should have received a copy of the GNU Lesser General Public
17 // License along with this library; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
23 // File : PyInterp_Dispatcher.cxx
24 // Author : Sergey ANIKIN, OCC
27 #include "PyInterp_Dispatcher.h" // !!! WARNING !!! THIS INCLUDE MUST BE THE VERY FIRST !!!
28 #include "PyInterp_Interp.h"
29 #include "PyInterp_Watcher.h"
30 #include <SALOME_Event.h>
33 #include <QCoreApplication>
35 class PyInterp_ExecuteEvent: public SALOME_Event
38 PyInterp_Request* myRequest;
39 PyInterp_ExecuteEvent( PyInterp_Request* r )
41 virtual void Execute()
47 PyInterp_Dispatcher* PyInterp_Dispatcher::myInstance = 0;
49 void PyInterp_Request::process()
53 bool isSync = IsSync();
59 processEvent( listener() );
65 void PyInterp_Request::safeExecute()
67 //ProcessVoidEvent( new PyInterp_ExecuteEvent( this ) );
71 void PyInterp_Request::Destroy( PyInterp_Request* request )
73 // Lock and unlock the mutex to avoid errors on its deletion
74 request->myMutex.lock();
75 request->myMutex.unlock();
79 QEvent* PyInterp_Request::createEvent() const
81 return new PyInterp_Event( PyInterp_Event::ES_NOTIFY, (PyInterp_Request*)this );
84 void PyInterp_Request::processEvent( QObject* o )
89 QEvent* e = createEvent();
94 QCoreApplication::postEvent( o, e );
97 QCoreApplication::sendEvent( o, e );
102 void PyInterp_Request::setListener( QObject* o )
109 void PyInterp_LockRequest::safeExecute()
112 PyLockWrapper aLock = getInterp()->GetLockWrapper();
113 //ProcessVoidEvent( new PyInterp_ExecuteEvent( this ) );
118 PyInterp_Event::~PyInterp_Event()
120 PyInterp_Request::Destroy( myRequest );
124 PyInterp_Dispatcher* PyInterp_Dispatcher::Get()
127 myInstance = new PyInterp_Dispatcher();
131 PyInterp_Dispatcher::PyInterp_Dispatcher()
134 myWatcher = new PyInterp_Watcher();
137 PyInterp_Dispatcher::~PyInterp_Dispatcher()
139 // Clear the request queue
142 QListIterator<RequestPtr> it( myQueue );
143 while ( it.hasNext() )
144 PyInterp_Request::Destroy( it.next() );
147 myQueueMutex.unlock();
149 // Wait for run() to finish
156 bool PyInterp_Dispatcher::IsBusy() const
161 void PyInterp_Dispatcher::Exec( PyInterp_Request* theRequest )
166 //if ( theRequest->IsSync() && !IsBusy() ) // synchronous processing - nothing is done if dispatcher is busy!
167 if ( theRequest->IsSync() ) // synchronous processing - nothing is done if dispatcher is busy!
168 processRequest( theRequest );
169 else // asynchronous processing
172 myQueue.enqueue( theRequest );
173 if ( theRequest->listener() )
174 QObject::connect( theRequest->listener(), SIGNAL( destroyed( QObject* ) ), myWatcher, SLOT( onDestroyed( QObject* ) ) );
175 myQueueMutex.unlock();
182 void PyInterp_Dispatcher::run()
184 // MESSAGE("*** PyInterp_Dispatcher::run(): STARTED")
185 PyInterp_Request* aRequest;
187 // prepare for queue size check
190 while( myQueue.size() ) {
191 // MESSAGE("*** PyInterp_Dispatcher::run(): next request taken from the queue")
192 aRequest = myQueue.head();
194 // let other threads append their requests to the end of the queue
195 myQueueMutex.unlock();
197 // processRequest() may delete a request, so this pointer must not be used
198 // after request is processed!
199 processRequest( aRequest );
201 // prepare for removal of the first request in the queue
203 // IMPORTANT: the first item could have been removed by objectDestroyed() --> we have to check it
204 if ( myQueue.head() == aRequest ) // It's still here --> remove it
207 // MESSAGE("*** PyInterp_Dispatcher::run(): request processed")
210 myQueueMutex.unlock();
211 // MESSAGE("*** PyInterp_Dispatcher::run(): FINISHED")
214 void PyInterp_Dispatcher::processRequest( PyInterp_Request* theRequest )
216 theRequest->process();
219 void PyInterp_Dispatcher::objectDestroyed( const QObject* o )
221 // prepare for modification of the queue
224 QMutableListIterator<RequestPtr> it( myQueue );
225 while ( it.hasNext() )
227 RequestPtr r = it.next();
228 if ( o == r->listener() )
230 r->setListener( 0 ); // to prevent event posting
235 myQueueMutex.unlock();