Class: Autoscaler::DelayedShutdown

Inherits:
Object
  • Object
show all
Defined in:
lib/autoscaler/delayed_shutdown.rb

Overview

This is a sort of middleware that keeps the last worker up for a minimum amount of time

Instance Method Summary collapse

Constructor Details

#initialize(strategy, timeout) ⇒ DelayedShutdown

Returns a new instance of DelayedShutdown.

Parameters:

  • object that makes most decisions

  • number of seconds to stay up after base strategy says zero



6
7
8
9
10
 
# File 'lib/autoscaler/delayed_shutdown.rb', line 6

def initialize(strategy, timeout)
  @strategy = strategy
  @timeout = timeout
  active_now!
end

Instance Method Details

#call(system, event_idle_time) ⇒ Integer

Returns target number of workers.

Parameters:

  • interface to the queuing system

  • number of seconds since a job related event

Returns:

  • target number of workers



15
16
17
18
19
20
21
22
23
24
25
 
# File 'lib/autoscaler/delayed_shutdown.rb', line 15

def call(system, event_idle_time)
  target_workers = strategy.call(system, event_idle_time)
  if target_workers > 0
    active_now!
    target_workers
  elsif time_left?(event_idle_time)
    1
  else
    0
  end
end