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Contents
module Appsignal
module Probes
module Helpers
private
def gauge_delta_cache
@gauge_delta_cache ||= {}
end
# Calculate the delta of two values for a gauge metric.
#
# When this method is called, the given value is stored in a cache
# under the given cache key.
#
# A block must be passed to this method. The first time the method
# is called for a given cache key, the block will not be yielded to.
# In subsequent calls, the delta between the previously stored value
# in the cache for that key and the value given in this invocation
# will be yielded to the block.
#
# This is used for absolute counter values which we want to track as
# gauges.
#
# @example
# gauge_delta :with_block, 10 do |delta|
# puts "this block will not be yielded to"
# end
# gauge_delta :with_block, 15 do |delta|
# # `delta` has a value of `5`
# puts "this block will be yielded to with delta = #{delta}"
# end
#
def gauge_delta(cache_key, value)
previous_value = gauge_delta_cache[cache_key]
gauge_delta_cache[cache_key] = value
return unless previous_value
yield value - previous_value
end
end
end
end
Version data entries
32 entries across 32 versions & 1 rubygems