class Roundhouse::ProcessSet
Enumerates the set of Roundhouse
processes which are actively working right now. Each process send a heartbeat to Redis every 5 seconds so this set should be relatively accurate, barring network partitions.
Yields a Roundhouse::Process
.
Public Class Methods
cleanup()
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Cleans up dead processes recorded in Redis. Returns the number of processes cleaned.
# File lib/roundhouse/api.rb, line 686 def self.cleanup count = 0 Roundhouse.redis do |conn| procs = conn.smembers('processes').sort heartbeats = conn.pipelined do procs.each do |key| conn.hget(key, 'info') end end # the hash named key has an expiry of 60 seconds. # if it's not found, that means the process has not reported # in to Redis and probably died. to_prune = [] heartbeats.each_with_index do |beat, i| to_prune << procs[i] if beat.nil? end count = conn.srem('processes', to_prune) unless to_prune.empty? end count end
new(clean_plz=true)
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# File lib/roundhouse/api.rb, line 680 def initialize(clean_plz=true) self.class.cleanup if clean_plz end
Public Instance Methods
each() { |process(merge('busy' => to_i, 'beat' => to_f))| ... }
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# File lib/roundhouse/api.rb, line 708 def each procs = Roundhouse.redis { |conn| conn.smembers('processes') }.sort Roundhouse.redis do |conn| # We're making a tradeoff here between consuming more memory instead of # making more roundtrips to Redis, but if you have hundreds or thousands of workers, # you'll be happier this way result = conn.pipelined do procs.each do |key| conn.hmget(key, 'info', 'busy', 'beat') end end result.each do |info, busy, at_s| hash = Roundhouse.load_json(info) yield Process.new(hash.merge('busy' => busy.to_i, 'beat' => at_s.to_f)) end end nil end
size()
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This method is not guaranteed accurate since it does not prune the set based on current heartbeat. each
does that and ensures the set only contains Roundhouse
processes which have sent a heartbeat within the last 60 seconds.
# File lib/roundhouse/api.rb, line 734 def size Roundhouse.redis { |conn| conn.scard('processes') } end