def startMonitoring(self, sdUUID, hostId, poolDomain=True):
with self._lock:
if self._shutting_down:
raise se.ShuttingDownError()
monitor = self._monitors.get(sdUUID)
# TODO: Replace with explicit attach.
if monitor is not None:
if not poolDomain:
# Expected when hosted engine agent is restarting.
log.debug("Monitor for %s is already running", sdUUID)
return
if monitor.poolDomain:
log.warning("Monitor for %s is already attached to pool",
sdUUID)
return
# An external storage domain attached to the pool.
# From this point, the storage domain is managed by Vdsm.
# Expected during Vdsm startup when using hosted engine.
log.info("Attaching monitor for %s to the pool", sdUUID)
monitor.poolDomain = True
return
log.info("Start monitoring %s", sdUUID)
monitor = MonitorThread(sdUUID, hostId, self._interval,
self.onDomainStateChange, self._checker)
monitor.poolDomain = poolDomain
monitor.start()
# The domain should be added only after it successfully started.
self._monitors[sdUUID] = monitor
def stopMonitoring(self, sdUUIDs):
with self._lock:
if self._shutting_down:
raise se.ShuttingDownError()
sdUUIDs = frozenset(sdUUIDs)
monitors = [
monitor for monitor in self._monitors.values()
if monitor.sdUUID in sdUUIDs
]
self._stopMonitors(monitors)
def shutdown(self):
"""
Called during shutdown to stop all monitors without releasing the host
id. To stop monitors and release the host id, use stopMonitoring().
"""
log.info("Shutting down domain monitors")
with self._lock:
if self._shutting_down:
raise se.ShuttingDownError()
# Set the shutdown flag to prevent new calls for stop or start
# monitoring which would modify the monitor dicts. We don't
# want to hold the lock itself during entire shutdown not to hang
# other operations as it can take a while.
self._shutting_down = True
self._stopMonitors(list(self._monitors.values()), shutdown=True)
self._checker.stop()
