added task broadcasting for workers within a group

gluon/scheduler.py

@@ -804,6 +804,7 @@ class Scheduler(MetaScheduler):
             Field('group_name', default='main'),
             Field('status', requires=IS_IN_SET(TASK_STATUS),
                   default=QUEUED, writable=False),
+            Field('broadcast', 'boolean', default=False),
             Field('function_name',
                   requires=IS_IN_SET(sorted(self.tasks.keys()))
                   if self.tasks else DEFAULT),
@@ -1358,6 +1359,31 @@ class Scheduler(MetaScheduler):
                 gname = task.group_name
                 ws = wkgroups.get(gname)
                 if ws:
+                    if task.broadcast:
+                        for worker in ws['workers']:                       
+                            new_task = db.scheduler_task.insert(
+                                application_name = task.application_name,
+                                task_name = task.task_name,
+                                group_name = task.group_name,
+                                status = ASSIGNED,
+                                broadcast = False,
+                                function_name = task.function_name,
+                                args = task.args,
+                                start_time = now,
+                                repeats = 1,
+                                retry_failed = task.retry_failed,
+                                sync_output = task.sync_output,
+                                assigned_worker_name = worker['name'])
+                        if task.period:
+                            next_run_time = now+datetime.timedelta(seconds=task.period)
+                        else:
+                            # must be cronline
+                            raise NotImplementedError
+                        db(st.id == task.id).update(times_run=task.times_run+1,
+                                                    next_run_time=next_run_time,
+                                                    last_run_time=now)
+                        db.commit()                          
+                    else:
                         counter = 0
                         myw = 0
                         for i, w in enumerate(ws['workers']):