Class: Angael::Manager

Inherits:
Object
  • Object
show all
Includes:
ProcessHelper
Defined in:
lib/angael/manager.rb

Overview

A Manager has a number of of worker objects. Starting the Manager simply calls #start! on each worker, then it goes into an infinite loop, waiting for SIGINT or SIGTERM. When either of those is received, the manager will call #stop_with_wait on each Worker.

Constant Summary collapse

LOOP_SLEEP_SECONDS = 
1

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ProcessHelper

#exit_status, #send_signal

Constructor Details

#initialize(worker_class, worker_count = 1, worker_args = [], opts = {}) ⇒ Manager

Creates a new manager.

Raises:

  • (ArgumentError) 


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# File 'lib/angael/manager.rb', line 29

def initialize(worker_class, worker_count=1, worker_args=[], opts={})
  @workers = []
  worker_count.times { workers << worker_class.new(*worker_args) }
  @restart_after = opts[:restart_after]
  # TODO: Add a spec for this
  raise ArgumentError, ':restart_after must be either an Integer greater than zero or nil' if @restart_after && (@restart_after.to_i != @restart_after || @restart_after == 0)
  @logger = opts[:logger]
end

Instance Attribute Details

#workers ⇒ Object (readonly)

Returns the value of attribute workers.



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# File 'lib/angael/manager.rb', line 11

def workers
  @workers
end

Instance Method Details

#start! ⇒ Object

Starts workers by calling Worker#start! Loops forever waiting for SIGINT or SIGTERM, at which time it calls Worker#stop_with_wait on each worker.



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# File 'lib/angael/manager.rb', line 41

def start!
  workers.each { |w| w.start! }

  trap("CHLD") do
    debug("SIGCHLD Received")
    @sigchld = true
  end
  trap("INT") do
    info("SIGINT Received")
    @interrupted = true
  end
  trap("TERM") do
    info("SIGTERM Received")
    @interrupted = true
  end

  if @restart_after
    loop do
      interrupted_handler
      sigchld_handler
      restart_worker_if_needed
      flush_logger
      sleep LOOP_SLEEP_SECONDS
    end
  else
    loop do
      interrupted_handler
      sigchld_handler
      flush_logger
      sleep LOOP_SLEEP_SECONDS
    end
  end
end