Fiber-aware EventMachine timer: wraps the passed in block within a new fiber (new fiber on every invocation) to allow you to continue using synchrony methods
# File lib/em-synchrony.rb, line 105 def self.add_periodic_timer(interval, &blk) EM.add_periodic_timer(interval) do Fiber.new { blk.call }.resume end end
Fiber-aware EventMachine timer: wraps the passed in block within a new fiber context such that you can continue using synchrony methods
# File lib/em-synchrony.rb, line 95 def self.add_timer(interval, &blk) EM::Timer.new(interval) do Fiber.new { blk.call }.resume end end
Fiber-aware EM.defer
# File lib/em-synchrony.rb, line 119 def self.defer op = nil, &blk fiber = Fiber.current EM.defer(op || blk, lambda{ |result| fiber.resume(result) }) Fiber.yield end
Routes to EM::Synchrony::Keyboard
# File lib/em-synchrony.rb, line 135 def self.gets EventMachine::Synchrony::Keyboard.new.gets end
Fiber-aware EM.next_tick convenience function
# File lib/em-synchrony.rb, line 113 def self.next_tick(&blk) EM.next_tick { Fiber.new { blk.call }.resume } end
Fiber-aware sleep function using an EM timer
Execution is stopped for specified amount of seconds and then automatically resumed (just like regular sleep) except without locking the reactor thread
# File lib/em-synchrony.rb, line 85 def self.sleep(secs) fiber = Fiber.current EM::Timer.new(secs) { fiber.resume } Fiber.yield end
sync is a close relative to inlineCallbacks from Twisted (Python)
Synchrony.sync allows you to write sequential code while using asynchronous or callback-based methods under the hood. Example:
result = EM::Synchrony.sync EventMachine::HttpRequest.new(URL).get p result.response
As long as the asynchronous function returns a Deferrable object, which has a "callback" and an "errback", the sync methond will automatically yield and automatically resume your code (via Fibers) when the call either succeeds or fails. You do not need to patch or modify the Deferrable object, simply pass it to EM::Synchrony.sync
# File lib/em-synchrony.rb, line 62 def self.sync(df) f = Fiber.current xback = proc do |*args| if f == Fiber.current return args.size == 1 ? args.first : args else f.resume(*args) end end df.callback(&xback) df.errback(&xback) Fiber.yield end
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