Class: QueueBus::Driver

Inherits:
Object
  • Object
show all
Defined in:
lib/queue_bus/driver.rb

Overview

Fans out an event to multiple queues

When a single event is broadcast, it may have zero to many subscriptions attached to it. The Driver is what is run in order to look up the subscription matches and enqueue each of the jobs. It uses the class_name supplied by the subscription to know which class will be performed.

Class Method Summary collapse

Class Method Details

.perform(attributes = {}) ⇒ Object 



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# File 'lib/queue_bus/driver.rb', line 21

def perform(attributes = {})
  raise 'No attributes passed' if attributes.empty?

  ::QueueBus.log_worker("Driver running: #{attributes.inspect}")

  subscription_matches(attributes).each do |sub|
    ::QueueBus.log_worker("  ...sending to #{sub.queue_name} queue with class #{sub.class_name} for app #{sub.app_key} because of subscription: #{sub.key}")

    bus_attr = {  'bus_driven_at' => Time.now.to_i,
                  'bus_rider_queue' => sub.queue_name,
                  'bus_rider_app_key' => sub.app_key,
                  'bus_rider_sub_key' => sub.key,
                  'bus_rider_class_name' => sub.class_name }
    bus_attr = bus_attr.merge(attributes || {})
    ::QueueBus.enqueue_to(sub.queue_name, sub.class_name, bus_attr)
  end
end

.subscription_matches(attributes) ⇒ Object 



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# File 'lib/queue_bus/driver.rb', line 12

def subscription_matches(attributes)
  out = []
  Application.all.each do |app|
    subs = app.subscription_matches(attributes)
    out.concat(subs)
  end
  out
end