Class: Creeper::Manager

Inherits:
Object
  • Object
show all
Includes:
Celluloid, Util
Defined in:
lib/creeper/manager.rb

Overview

The main router in the system. This manages the processor state and accepts messages from Redis to be dispatched to an idle processor.

Constant Summary

Constants included from Util

Util::EXPIRY

Instance Method Summary collapse

Methods included from Util

#beanstalk, #constantize, #logger, #process_id, #redis, #watchdog

Methods included from ExceptionHandler

#handle_exception

Constructor Details

#initialize(options = {}) ⇒ Manager

Returns a new instance of Manager.



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# File 'lib/creeper/manager.rb', line 20

def initialize(options={})
  logger.info "Booting creeper #{Creeper::VERSION} with Beanstalk at #{beanstalk { |x| x.instance_variable_get(:@addrs).join(', ')}} and Redis at #{redis {|x| x.client.id}}"
  logger.info "Running in #{RUBY_DESCRIPTION}"
  logger.debug { options.inspect }
  @count = options[:concurrency] || 25
  @done_callback = nil

  @in_progress = {}
  @done = false
  @busy = []
  @fetcher = Fetcher.new(current_actor, options[:queues], !!options[:strict])
  @ready = @count.times.map { Processor.new_link(current_actor) }
  procline
end

Instance Method Details

#assign(msg, queue, job, conn) ⇒ Object 



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# File 'lib/creeper/manager.rb', line 99

def assign(msg, queue, job, conn)
  watchdog("Manager#assign died") do
    if stopped?
      # Race condition between Manager#stop if Fetcher
      # is blocked on redis and gets a message after
      # all the ready Processors have been stopped.
      # Push the message back to redis.
      job.release rescue nil
      conn.close rescue nil
      # Creeper.redis do |conn|
      #   conn.lpush("queue:#{queue}", msg)
      # end
    else
      processor = @ready.pop
      @in_progress[processor.object_id] = [msg, queue, job, conn]
      @busy << processor
      processor.process!(msg, queue, job, conn)
    end
  end
end

#processor_died(processor, reason) ⇒ Object 



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# File 'lib/creeper/manager.rb', line 85

def processor_died(processor, reason)
  watchdog("Manager#processor_died died") do
    @in_progress.delete(processor.object_id)
    @busy.delete(processor)

    unless stopped?
      @ready << Processor.new_link(current_actor)
      dispatch
    else
      signal(:shutdown) if @busy.empty?
    end
  end
end

#processor_done(processor) ⇒ Object 



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# File 'lib/creeper/manager.rb', line 70

def processor_done(processor)
  watchdog('Manager#processor_done died') do
    @done_callback.call(processor) if @done_callback
    @in_progress.delete(processor.object_id)
    @busy.delete(processor)
    if stopped?
      processor.terminate if processor.alive?
      signal(:shutdown) if @busy.empty?
    else
      @ready << processor if processor.alive?
    end
    dispatch
  end
end

#start ⇒ Object 



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# File 'lib/creeper/manager.rb', line 62

def start
  @ready.each { dispatch }
end

#stop(options = {}) ⇒ Object 



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# File 'lib/creeper/manager.rb', line 35

def stop(options={})
  watchdog('Manager#stop died') do
    shutdown = options[:shutdown]
    timeout = options[:timeout]

    @done = true
    Creeper::Fetcher.done!
    @fetcher.terminate! if @fetcher.alive?

    logger.info { "Shutting down #{@ready.size} quiet workers" }
    @ready.each { |x| x.terminate if x.alive? }
    @ready.clear

    logger.debug { "Clearing workers in redis" }
    Creeper.redis do |conn|
      workers = conn.smembers('workers')
      workers.each do |name|
        conn.srem('workers', name) if name =~ /:#{process_id}-/
      end
    end

    return after(0) { signal(:shutdown) } if @busy.empty?
    logger.info { "Pausing up to #{timeout} seconds to allow workers to finish..." }
    hard_shutdown_in timeout if shutdown
  end
end

#when_done(&blk) ⇒ Object 



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# File 'lib/creeper/manager.rb', line 66

def when_done(&blk)
  @done_callback = blk
end