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Contents
# encoding: utf-8
# This file is distributed under New Relic's license terms.
# See https://github.com/newrelic/rpm/blob/master/LICENSE for complete details.
#
# A Sampler is used to capture meaningful metrics in a background thread
# periodically. They will be invoked about once a minute, each time the agent
# sends data to New Relic's servers.
#
# Samplers can be added to New Relic by subclassing NewRelic::Agent::Sampler.
# Instances are created when the agent is enabled and installed. Subclasses
# are registered for instantiation automatically.
module NewRelic
module Agent
class Sampler
# Exception denotes a sampler is not available and it will not be registered.
class Unsupported < StandardError; end
attr_reader :id
@sampler_classes = []
class << self
attr_reader :shorthand_name
end
def self.named(new_name)
@shorthand_name = new_name
end
def self.inherited(subclass)
@sampler_classes << subclass
end
# Override with check. Called before instantiating.
def self.supported_on_this_platform?
true
end
def self.enabled?
if shorthand_name
config_key = "disable_#{shorthand_name}_sampler"
!(Agent.config[config_key])
else
true
end
end
def self.sampler_classes
@sampler_classes
end
# The ID passed in here is unused by our code, but is preserved in case
# we have clients who are defining their own subclasses of this class, and
# expecting to be able to call super with an ID.
def initialize(id=nil)
@id = id || self.class.shorthand_name
end
def poll
raise "Implement in the subclass"
end
end
end
end
Version data entries
36 entries across 36 versions & 1 rubygems