Class: SemanticLogger::JRuby::GarbageCollectionLogger

Inherits:
Object
  • Object
show all
Includes:
Java::JavaxManagement::NotificationListener
Defined in:
lib/semantic_logger/jruby/garbage_collection_logger.rb

Instance Method Summary collapse

Constructor Details

#initialize(min_microseconds = 10_000) ⇒ GarbageCollectionLogger

Only log the garbage collection if the number of microseconds exceeds this value



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# File 'lib/semantic_logger/jruby/garbage_collection_logger.rb', line 8

def initialize(min_microseconds = 10_000)
  @min_microseconds = min_microseconds
end

Instance Method Details

#handleNotification(notification, _) ⇒ Object

Must leave the method name as-is so that it can be found by Java



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# File 'lib/semantic_logger/jruby/garbage_collection_logger.rb', line 13

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