[add] MultiThread class added

pylot/core/util/thread.py

@@ -96,3 +96,68 @@ class Thread(QThread):
     def flush(self):
         pass
     
+    
+class MultiThread(QThread):
+    finished = Signal(str)
+    message = Signal(str)    
+
+    def __init__(self, parent, func, args, ncores=1,
+                 progressText=None, pb_widget=None, redirect_stdout=False):
+        QThread.__init__(self, parent)
+        self.func = func
+        self.args = args
+        self.progressText = progressText
+        self.pb_widget = pb_widget
+        self.redirect_stdout = redirect_stdout
+        self.finished.connect(self.hideProgressbar)
+        self.showProgressbar()
+        
+    def run(self):
+        if self.redirect_stdout:
+            sys.stdout = self        
+        try:
+            pool = multiprocessing.Pool(self.ncores)
+            self.data = pool.map_async(self.func, self.args, callback=self.emitDone)
+            #self.data = pool.apply_async(self.func, self.shotlist, callback=self.emitDone) #emit each time returned
+            pool.close()
+            self._executed = True
+            return result        
+        except Exception as e:
+            self._executed = False
+            self._executedError = e
+            exc_type, exc_obj, exc_tb = sys.exc_info()
+            fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
+            print('Exception: {}, file: {}, line: {}'.format(exc_type, fname, exc_tb.tb_lineno))
+        sys.stdout = sys.__stdout__        
+
+    def __del__(self):
+        self.wait()
+
+    def showProgressbar(self):
+        if self.progressText:
+            if not self.pb_widget:
+                self.pb_widget = QDialog(self.parent())
+                self.pb_widget.setWindowFlags(Qt.SplashScreen)                
+                self.pb_widget.setModal(True)
+            hl = QHBoxLayout()
+            pb = QProgressBar()
+            pb.setRange(0, 0)
+            hl.addWidget(pb)
+            hl.addWidget(QLabel(self.progressText))
+            self.pb_widget.setLayout(hl)
+            self.pb_widget.show()
+
+    def hideProgressbar(self):
+        if self.pb_widget:
+            self.pb_widget.hide()
+
+    def write(self, text):
+        self.message.emit(text)
+
+    def flush(self):
+        pass
+    
+    def emitDone(self, result):
+        print('emitDone!')
+        self.finished.emit('Done thread!')
+        self.hideProgressBar()