autopep8 action fixes

ganga/GangaCore/Core/MonitoringComponent/MonitoringService.py

@@ -71,6 +71,11 @@ def _check_active_backends(self, job_slice=None):
                 log.debug("RegistryLockError: The job was most likely removed")
                 log.debug("Reg LockError%s" % str(err))
 
+        if job_slice and len(found_active_backends) == 0:
+            log.debug("No active backends found with a job slice. Turning off the monitoring loop")
+            self.enabled = False
+            return
+
         # If a backend is newly found as active, trigger its monitoring
         previously_active_backends = self.active_backends
         self.active_backends = found_active_backends
@@ -226,3 +231,27 @@ def stop(self):
             log.error(err)
         self._cleanup_scheduled_tasks()
         self.loop.call_soon_threadsafe(self.loop.stop)
+
+    def runMonitoring(self, jobs=None):
+        """
+        Enable/Run the monitoring loop and wait for the monitoring steps completion.
+        Parameters:
+          steps:   number of monitoring steps to run
+          timeout: how long to wait for monitor steps termination (seconds)
+          jobs: a registry slice to be monitored (None -> all jobs)
+        Return:
+          False, if the loop cannot be started or the timeout occured while waiting for monitoring termination
+          True, if the monitoring steps were successfully executed
+        Note:
+          This method is meant to be used in Ganga scripts to request monitoring on demand.
+        """
+        log.debug("runMonitoring")
+        if not self.alive:
+            log.error("Cannot run the monitoring loop. It has already been stopped")
+            return False
+
+        self.enabled = True
+        self.thread_executor = ThreadPoolExecutor(max_workers=THREAD_POOL_SIZE)
+        self._cleanup_dirty_jobs()
+        self.loop.call_soon_threadsafe(functools.partial(self._check_active_backends, jobs))
+        return True