Class: Switchboard::Core

Inherits:
Object
  • Object
show all
Includes:
Timeout
Defined in:
lib/switchboard/core.rb

Direct Known Subclasses

Client, Component

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(settings = Switchboard::Settings.new, spin = true, &block) ⇒ Core

Returns a new instance of Core.



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# File 'lib/switchboard/core.rb', line 38

def initialize(settings = Switchboard::Settings.new, spin = true, &block)
  # register a handler for SIGINTs
  trap(:INT) do
    # exit on a second ^C
    trap(:INT) do
      exit
    end

    @deferreds.each do |name, deferred|
      puts "Killing #{name}" if debug?
      deferred.kill
    end

    shutdown!
  end

  @settings = settings
  @loop = spin
  @shutdown = false
  @deferreds = {}
  @main = block if block_given?
end

Instance Attribute Details

#jacks ⇒ Object (readonly)

Returns the value of attribute jacks.



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# File 'lib/switchboard/core.rb', line 21

def jacks
  @jacks
end

#settings ⇒ Object (readonly)

Returns the value of attribute settings.



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# File 'lib/switchboard/core.rb', line 21

def settings
  @settings
end

Class Method Details

.hook(*events) ⇒ Object

Register a hook



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# File 'lib/switchboard/core.rb', line 24

def self.hook(*events)
  events.each do |event|
    module_eval(<<-EOS, __FILE__, __LINE__)
      def on_#{event}(method = nil, &block)
        if block_given?
          register_hook(:#{event}, &block)
        elsif method
          register_hook(:#{event}, method)
        end
      end
    EOS
  end
end

Instance Method Details

#defer(callback_name, timeout = 30, &block) ⇒ Object

TODO don’t start threads yet; wait until all startup hooks have been run



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# File 'lib/switchboard/core.rb', line 75

def defer(callback_name, timeout = 30, &block)
  puts "Deferring to #{callback_name}..." if debug?
  @deferreds[callback_name.to_sym] = Thread.new(callback_name.to_sym) do |callback|

    begin

      timeout(timeout) do
        begin
          results = instance_eval(&block)
          send(callback, results) if respond_to?(callback)
        rescue Jabber::ServerError => e
          puts "Server error: #{e}"
        end
      end

      puts "Done with #{callback}." if debug?
      # TODO make this thread-safe
      @deferreds.delete(callback)

    rescue Timeout::Error
      puts "Deferred method timed out."
    rescue
      puts "An error occurred while running a deferred: #{$!}"
      puts $!.backtrace * "\n"
      puts "Initiating shutdown..."
      @shutdown = true
    end
  end
end

#hook(*events) ⇒ Object 



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# File 'lib/switchboard/core.rb', line 105

def hook(*events)
  self.class.hook(*events)
end

#plug!(*jacks) ⇒ Object

Connect a jack to the switchboard



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# File 'lib/switchboard/core.rb', line 110

def plug!(*jacks)
  @jacks ||= []
  jacks.each do |jack|
    puts "Connecting jack: #{jack}" if debug?
    @jacks << jack
    if jack.connect(self, settings) == false
      puts "A jack was unable to connect. Shutting down..."
      shutdown(false)
      exit 1
    end
  end
end

#run! ⇒ Object

Start running.



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# File 'lib/switchboard/core.rb', line 62

def run!
  startup

  if @main
    instance_eval(&@main)
  elsif loop?
    sleep 5 while !shutdown?
  end

  shutdown
end