Class: LiveResource::RemoteMethodDispatcher

Inherits:
Object
  • Object
show all
Includes:
LogHelper
Defined in:
lib/live_resource/methods/dispatcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from LogHelper

#logger, #logger=

Constructor Details

#initialize(resource) ⇒ RemoteMethodDispatcher

Returns a new instance of RemoteMethodDispatcher.



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# File 'lib/live_resource/methods/dispatcher.rb', line 10

def initialize(resource)
  @resource = resource
  @thread = nil
  @running = false

  start
end

Instance Attribute Details

#resource ⇒ Object (readonly)

Returns the value of attribute resource.



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# File 'lib/live_resource/methods/dispatcher.rb', line 8

def resource
  @resource
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/live_resource/methods/dispatcher.rb', line 8

def thread
  @thread
end

Instance Method Details

#redis ⇒ Object 



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# File 'lib/live_resource/methods/dispatcher.rb', line 18

def redis
  @resource.redis
end

#run ⇒ Object 



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# File 'lib/live_resource/methods/dispatcher.rb', line 47

def run
  info("#{self} method dispatcher starting")

  # Register methods and attributes used by this resource class
  redis.register_methods @resource.remote_methods
  redis.register_attributes @resource.remote_attributes

  # Need to register our class and instance in Redis so the finders
  # (all, any, etc.) will work.
  redis.register

  @running = true

  begin
    loop do
      token = redis.method_wait

      if is_exit_token(token)
        if token == exit_token
          redis.method_done token
          break
        else
          redis.method_push token
          next
        end
      end

      method = redis.method_get(token)

      begin
        result = validate_method(method).call(*method.params)

        if result.is_a? Resource
          # Return descriptor of a resource proxy instead
          result = ResourceProxy.new(
            result.redis.redis_class,
            result.redis.redis_name)
        elsif result.is_a? RemoteMethodForward
          # Append forwarding instructions to current method
          method.forward_to result
        end

        if method.final_destination?
          redis.method_result method, result
        else
          # Forward on to next step in method's path
          dest = method.next_destination!

          unless result.is_a? RemoteMethodForward
            # First parameter(s) to next method will be the result
            # of this method call.
            if result.is_a? Array
              method.params = result + method.params
            else
              method.params.unshift result
            end
          end

          dest.remote_send method
        end
      rescue Exception => e
        # TODO: custom encoding for exception to make it less
        # Ruby-specific.

        debug "Method #{method.token} failed:", e.message
        redis.method_result method, e
      end

      redis.method_done token
      redis.method_discard_result(token) if method.flags[:discard_result]
    end
  ensure
    # NOTE: if this process crashes outright, or we lose network
    # connection to Redis, or whatever -- this decrement won't occur.
    # Supervisor should clean up where possible.
    redis.unregister

    info("#{self} method dispatcher exiting")

  end
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/live_resource/methods/dispatcher.rb', line 37

def running?
  (@thread != nil) && @running
end

#start ⇒ Object 



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# File 'lib/live_resource/methods/dispatcher.rb', line 22

def start
  return if @thread

  @thread = Thread.new { run }
end

#stop ⇒ Object 



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# File 'lib/live_resource/methods/dispatcher.rb', line 28

def stop
  return if @thread.nil?

  redis.method_push exit_token
  @running = false
  @thread.join
  @thread = nil
end

#wait_for_running ⇒ Object 



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# File 'lib/live_resource/methods/dispatcher.rb', line 41

def wait_for_running
  while !running? do
    Thread.pass
  end
end