try to get the singleton class done for importing

fixed mail task

linspector/tasks/mail.py

@@ -67,10 +67,10 @@ class MailTask(Task):
         now = datetime.datetime.now()
         message['Date'] = now.strftime("%a, %d %b %Y %H:%M:%S")
         message['From'] = self.sender
-        message['To'] = self.rcpt["rcpt"]
+        message['To'] = self.rcpt
         s = smtplib.SMTP(self.host, self.port)
         #s.login(self.userName, self.password)
-        s.sendmail(self.sender, self.rcpt["rcpt"], message.as_string())
+        s.sendmail(self.sender, self.rcpt, message.as_string())
         s.quit()
 
 

linspector/tasks/task.py

@@ -66,39 +66,54 @@ class Task(object):
             raise e
 
 
-"""
-class TaskList(object):
-    def __init__(self, tasks):
-        self.tasks = tasks
+
+class TaskExecutor(object):
+    _instance = None
+    def __new__(cls, *args, **kwargs):
+        if not cls._instance:
+            cls._instance = super(TaskExecutor, cls).__init__()
+        return cls._instance
+
+    def __init__(self):
         self.event = Event()
         self.taskInfos = []
         task_thread = Thread(target=self._run_worker_thread)
         task_thread.setDaemon(True)
+        self._instantEnd = False
+        self._running = True
         task_thread.start()
 
+
     def _run_worker_thread(self):
-        while True:
+        while self.is_running() or not self.instand_end():
             if len(self.taskInfos) == 0:
                 self.event.clear()
                 self.event.wait()
+
+            try:
                 msg, taskInfos = self.taskInfos[0]
                 del self.taskInfos[0]
-            try:
                 for taskInfo in taskInfos:
                     task = self.find_task_by_name(taskInfo["class"])
                     if task:
                         logger.debug("Starting Task Execution...")
                         task.execute(msg, taskInfo["args"])
-            except:
-                logger.debug("Something failed!")
-                pass
+            except Exception, e:
+                logger.error("Error " + str(e))
 
-    def find_task_by_name(self, clazzName):
-        for task in self.tasks:
-            if task.get_task_type() == clazzName:
-                return task
+    def is_instand_end(self):
+        return self._instantEnd
 
-    def execute_task_infos(self, msg, taskInfos):
-        self.taskInfos.append((msg, taskInfos))
+    def is_running(self):
+        return self._running
+
+    def stop(self):
+        self._running = False
+
+    def stop_immediately(self):
+        self.stop()
+        self._instantEnd = True
+
+    def schedule_task(self, msg, task):
+        self.taskInfos.append((msg, task))
         self.event.set()
-"""

linspector/utils/singleton.py

@@ -0,0 +1,61 @@
+"""
+The Singleton classes.
+
+Copyright (c) 2011-2013 by Johannes Findeisen and Rafael Timmerberg
+
+This file is part of Linspector (http://linspector.org).
+
+Linspector is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+This program 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+"""
+
+#see http://stackoverflow.com/questions/42558/python-and-the-singleton-pattern
+
+class Singleton:
+    """
+    A non-thread-safe helper class to ease implementing singletons.
+    This should be used as a decorator -- not a metaclass -- to the
+    class that should be a singleton.
+
+    The decorated class can define one `__init__` function that
+    takes only the `self` argument. Other than that, there are
+    no restrictions that apply to the decorated class.
+
+    To get the singleton instance, use the `Instance` method. Trying
+    to use `__call__` will result in a `TypeError` being raised.
+
+    Limitations: The decorated class cannot be inherited from.
+
+    """
+
+    def __init__(self, decorated):
+        self._decorated = decorated
+
+    def Instance(self):
+        """
+        Returns the singleton instance. Upon its first call, it creates a
+        new instance of the decorated class and calls its `__init__` method.
+        On all subsequent calls, the already created instance is returned.
+
+        """
+        try:
+            return self._instance
+        except AttributeError:
+            self._instance = self._decorated()
+            return self._instance
+
+    def __call__(self):
+        raise TypeError('Singletons must be accessed through `Instance()`.')
+
+    def __instancecheck__(self, inst):
+        return isinstance(inst, self._decorated)