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module Flipper
module Adapters
class Sync
# Internal: Wraps a Synchronizer instance and only invokes it every
# N milliseconds.
class IntervalSynchronizer
# Private: Number of milliseconds between syncs (default: 10 seconds).
DEFAULT_INTERVAL_MS = 10_000
# Private
def self.now_ms
Process.clock_gettime(Process::CLOCK_MONOTONIC, :millisecond)
end
# Public: The number of milliseconds between invocations of the
# wrapped synchronizer.
attr_reader :interval
# Public: Initializes a new interval synchronizer.
#
# synchronizer - The Synchronizer to call when the interval has passed.
# interval - The Integer number of milliseconds between invocations of
# the wrapped synchronizer.
def initialize(synchronizer, interval: nil)
@synchronizer = synchronizer
@interval = interval || DEFAULT_INTERVAL_MS
# TODO: add jitter to this so all processes booting at the same time
# don't phone home at the same time.
@last_sync_at = 0
end
def call
return unless time_to_sync?
@last_sync_at = now_ms
@synchronizer.call
nil
end
private
def time_to_sync?
(now_ms - @last_sync_at) >= @interval
end
def now_ms
self.class.now_ms
end
end
end
end
end
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