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Contents
module SemanticLogger
module JRuby
class GarbageCollectionLogger
include Java::JavaxManagement::NotificationListener
# Only log the garbage collection if the number of microseconds exceeds
# this value
def initialize(min_microseconds = 10_000)
@min_microseconds = min_microseconds
end
# Must leave the method name as-is so that it can be found by Java
def handleNotification(notification, _)
# Only care about GARBAGE_COLLECTION_NOTIFICATION notifications
return unless notification.get_type == Java::ComSunManagement::GarbageCollectionNotificationInfo::GARBAGE_COLLECTION_NOTIFICATION
info = Java::ComSunManagement::GarbageCollectionNotificationInfo.from(notification.user_data)
gc_info = info.gc_info
duration = gc_info.duration
return unless duration >= @min_microseconds
SemanticLogger['GarbageCollector'].measure_warn(
"Garbage Collection completed: #{info.gc_name} ##{gc_info.id}",
duration: duration.to_f / 1000
)
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems