Class: Roundhouse::ProcessSet

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/roundhouse/api.rb

Overview

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.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(clean_plz = true) ⇒ ProcessSet

Returns a new instance of ProcessSet.



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# File 'lib/roundhouse/api.rb', line 680

def initialize(clean_plz=true)
  self.class.cleanup if clean_plz
end

Class Method Details

.cleanup ⇒ Object

Cleans up dead processes recorded in Redis. Returns the number of processes cleaned.



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# 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

Instance Method Details

#each ⇒ Object 



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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 ⇒ Object

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.



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# File 'lib/roundhouse/api.rb', line 734

def size
  Roundhouse.redis { |conn| conn.scard('processes') }
end