Module: Hyperloop::Context

Defined in:
lib/hyperloop/context.rb

Overview

Allows interactive systems to reset context to the state at boot. Any modules or classes that set context instance variables to hold things like call backs should use Hyperloop::Context.set_var(self, :@var_name) { .… } the provided block will be rerun and the instance variable re-initialized when the reset! method is called

Class Method Summary collapse

Class Method Details

.reset!(reboot = true) ⇒ Object 



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# File 'lib/hyperloop/context.rb', line 22

def self.reset!(reboot = true)
  # if @context is already initialized then reset all the instance
  # vars using their corresponding blocks.  Otherwise initialize
  # @context.
  if @context
    @context.each do |ctx, vars|
      vars.each { |var, init| ctx.instance_variable_set(var, init) }
    end
    Hyperloop::Application::Boot.run if reboot
  else
    @context = Hash.new { |h, k| h[k] = {} }
  end
end

.set_var(ctx, var, force: nil) ⇒ Object

Replace @foo ||= … with Context.set_var(self, :@foo) { … } If reset! has been called then the instance variable will be record, and will be reset on the next call to reset! If you want to record the current value of the instance variable then set force to true.



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# File 'lib/hyperloop/context.rb', line 14

def self.set_var(ctx, var, force: nil)
  inst_value_b4 = ctx.instance_variable_get(var)
  if @context && !@context[ctx].key?(var) && (force || !inst_value_b4)
    @context[ctx][var] = (inst_value_b4 && inst_value_b4.dup)
  end
  inst_value_b4 || ctx.instance_variable_set(var, yield)
end