1 files changed, 10 insertions, 0 deletions
diff --git a/lib/bb/event.py b/lib/bb/event.py
index 6f1cb101f..cacbac8f5 100644
--- a/lib/bb/event.py
+++ b/lib/bb/event.py
@@ -48,6 +48,16 @@ class Event(object):
     def __init__(self):
         self.pid = worker_pid
 
+
+class HeartbeatEvent(Event):
+    """Triggered at regular time intervals of 10 seconds. Other events can fire much more often
+       (runQueueTaskStarted when there are many short tasks) or not at all for long periods
+       of time (again runQueueTaskStarted, when there is just one long-running task), so this
+       event is more suitable for doing some task-independent work occassionally."""
+    def __init__(self, time):
+        Event.__init__(self)
+        self.time = time
+
 Registered        = 10
 AlreadyRegistered = 14