Class: EventCore::UnixSignalSource

Inherits:
PipeSource show all
Defined in:
lib/event_core.rb

Overview

A source that marshals Unix signals to be handled in the main loop. This detaches you from the dreaded “trap context”, and allows you to reason about the state of the rest of your app in the signal handler.

The trigger is called with an array of signals as argument. There can be more than one signal if more than one signal fired since the source was last checked.

Closing the signal handler will set the trap handler to DEFAULT.

Instance Attribute Summary

Attributes inherited from PipeSource

#rio, #wio

Instance Method Summary collapse

Methods inherited from PipeSource

#closed?, #consume_event_data!, #select_io, #select_type, #write

Methods inherited from Source

#closed?, #consume_event_data!, #notify_trigger, #ready!, #ready?, #select_io, #select_type, #timeout, #trigger

Constructor Details

#initialize(*signals) ⇒ UnixSignalSource

Give it a list of signals, names or integers, to listen for.



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# File 'lib/event_core.rb', line 289

def initialize(*signals)
  super()
  @signals = signals
  @signals.each do |sig|
    Signal.trap(sig) do
      write("#{sig}+")
    end
  end
end

Instance Method Details

#close! ⇒ Object 



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# File 'lib/event_core.rb', line 304

def close!
  super
  # Restore default signal handlers
  @signals.each { |sig| Signal.trap(sig, "DEFAULT")}
end

#event_factory(event_data) ⇒ Object 



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# File 'lib/event_core.rb', line 299

def event_factory(event_data)
  # We may have received more than one signal since last check
  event_data.split('+')
end