serv·ice noun /ˈsɜr vɪs/ : The action of helping or doing work for someone.
Service encapsulates an object which executes a bit of code in a loop that can be started or stopped and query whether it is running or not.
gem install service
You can define an Object as a Service by subclassing
Service or by including/extending
class ServiceA < Service end class ServiceB include Service::Base end class ServiceC extend Service::Base end
Service object stores it's state in the
@_service_state instance variable as to be as
unobtrusive as possible when integrating with your custom objects.
The next thing to do is define a
execute instance method on your object:
class MyService < Service def execute # ... end end
Service gives simply allows you to run your code that is within the
execute method in four different ways:
execute), once in a new Thread (
execute!), in a loop (
run), or in a loop within a
new Thread (
run instance method to call the
execute instance method in a loop.
class MyService < Service def execute puts "Hello" end end MyService.new.run # => Hello # => Hello # => ...
run! to call the
run in a new Thread.
class MyService < Service def execute puts "Hello" end end thread = MyService.new.run! thread.join # => Hello # => Hello # => ...
stop instance method break the run loop.
This will also kill the Thread it is running in, if running in a Thread.
class MyService < Service def execute sleep 3 stop end end print "Running MyService in a new Thread... " thread = MyService.new.run! thread.join puts "Done!"
stopped? instance methods to determine the current state of
the Service instance.
class MyService < Service def execute sleep 10 end end service = MyService.new p service.running? # => false service.run! sleep 1 p service.running? # => true
require 'service' class PingService < Service def execute sleep rand(5) print 'ping' stop end end class PongService include Service::Base def execute sleep rand(5) print 'pong' stop end end class ExcitementService extend Service::Base def execute sleep rand(5) print '!' stop end end threads =  threads << PingService.new.run! threads << PongService.new.run! threads << ExcitementService.new.run! threads.each(&:join)
Copyright © 2012 Ryan Scott Lewis email@example.com.
The MIT License (MIT) - See LICENSE for further details.