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Contents
# A Sampler is used to capture meaningful metrics in a background thread
# periodically. They will either be invoked once a minute just before the
# data is sent to the agent (default) or every 10 seconds, when #use_harvest_sampler?
# returns false.
#
# 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_accessor :stats_engine
attr_reader :id
@sampler_classes = []
def self.inherited(subclass)
@sampler_classes << subclass
end
# Override with check. Called before instantiating.
def self.supported_on_this_platform?
true
end
# Override to use the periodic sampler instead of running the sampler on the
# minute during harvests.
def self.use_harvest_sampler?
true
end
def self.sampler_classes
@sampler_classes
end
def initialize(id)
@id = id
end
def poll
raise "Implement in the subclass"
end
end
end
end
Version data entries
121 entries across 121 versions & 6 rubygems