Class: ValueTracking

Inherits:
Object
  • Object
show all
Defined in:
lib/logstash/inputs/value_tracking.rb

Direct Known Subclasses

DateTimeValueTracker

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(handler) ⇒ ValueTracking

Returns a new instance of ValueTracking.



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# File 'lib/logstash/inputs/value_tracking.rb', line 17

def initialize(handler)
  @file_handler = handler
  set_value(get_initial)
end

Instance Attribute Details

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/logstash/inputs/value_tracking.rb', line 15

def value
  @value
end

Class Method Details

.build_last_value_tracker(plugin) ⇒ Object 



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# File 'lib/logstash/inputs/value_tracking.rb', line 4

def self.build_last_value_tracker(plugin)
  handler = NullFileHandler.new(plugin.last_run_metadata_path)
  if plugin.record_last_run
    handler = FileHandler.new(plugin.last_run_metadata_path)
  end
  if plugin.clean_run
    handler.clean
  end
  instance = DateTimeValueTracker.new(handler)
end

Instance Method Details

#get_initial ⇒ Object 



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# File 'lib/logstash/inputs/value_tracking.rb', line 22

def get_initial
  # override in subclass
end

#set_value(value) ⇒ Object 



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# File 'lib/logstash/inputs/value_tracking.rb', line 26

def set_value(value)
  # override in subclass
end

#write ⇒ Object 



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# File 'lib/logstash/inputs/value_tracking.rb', line 30

def write
  @file_handler.write(@value.to_s)
end