import openhab
from java.lang.management import ManagementFactory
from com.sun.management import HotSpotDiagnosticMXBean
hotSpotDiagnosticMXBean = ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean)
@openhab.rule
class HeapDumpRule(object):
"""Dump the Java heap when thread count exceeds a specified threshold"""
def __init__(self, maxThreads, outpath, notify=False):
self._maxThreads = maxThreads
self._outpath = outpath
self._notify = notify
self._dumped = False
def getEventTrigger(self):
return [ ChangedEventTrigger("JmxThreadCount") ]
def execute(self, event):
if not self._dumped and event.item.state.intValue() > self._maxThreads:
self._dumped = True
message = "EXCESSIVE THREADS: count={}, dumping heap".format(event.item.state)
self.log.error(message)
if self._notify:
self.sendNotification(message)
hotSpotDiagnosticMXBean.dumpHeap(self._outpath, True)
def getRules():
return RuleSet([ HeapDumpRule(400, "/opt/openhab-1.7.1/memory_dump.hprof", True) ])
