Class: RuleEngine::RunQueue

Inherits:
Object
  • Object
show all
Defined in:
lib/cirrocumulus/rules/run_queue.rb

Instance Method Summary collapse

Constructor Details

#initialize(engine) ⇒ RunQueue

Returns a new instance of RunQueue.



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# File 'lib/cirrocumulus/rules/run_queue.rb', line 21

def initialize(engine)
  @engine = engine
  @queue = []
  @running_rules = []
  @mutex = Mutex.new
end

Instance Method Details

#enqueue(match_data) ⇒ Object 



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# File 'lib/cirrocumulus/rules/run_queue.rb', line 28

def enqueue(match_data)
  @mutex.synchronize do
    if !already_queued?(match_data.rule, match_data.parameters)
      debug "Enqueueing rule #{match_data.rule.name}#{match_data.parameters.inspect}"

      if !match_data.rule.options.blank? && match_data.rule.options.include?(:for)
        delay = match_data.rule.options[:for]
        run_at = Time.now + delay
        debug "Will run this rule after #{delay.to_s} sec (at #{run_at.strftime("%H:%M:%S %d.%m.%Y")})"
        @queue << QueueEntry.new(match_data, run_at)
      else
        @queue << QueueEntry.new(match_data)
      end
    end
  end
end

#run_queued_rules ⇒ Object 



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# File 'lib/cirrocumulus/rules/run_queue.rb', line 45

def run_queued_rules()
  rules_for_running = Queue.new
  @mutex.synchronize do
    count = @queue.count {|entry| entry.state == :queued}

    if count > 0
      debug "There are #{count} rules waiting, running.." if count > 1

      idx = 0
      while count > 0
        entry = @queue[idx]

        if entry.state != :queued
          idx += 1
          next
        end

        if entry.run_at.blank? || (entry.run_at <= Time.now)
          rules_for_running << entry
          entry.state = :running
        end

        idx += 1
        count -= 1
      end
    end
  end

  while !rules_for_running.empty? do
    entry = rules_for_running.pop
    if entry.run_data.matched_facts.all? {|fact| !fact.is_deleted} # TODO: there should be smth like WeakReference
      begin
        debug "Executing #{entry.rule.name}#{entry.params.inspect}"
        entry.rule.code.call(@engine, entry.params)
        entry.state = :finished # TODO: cleanup @queue from this entries

      rescue Exception => e
        Log4r::Logger['kb'].warn "Exception while executing rule: %s\n%s" % [e.to_s, e.backtrace.to_s]
      end
    else
      entry.state = :finished
    end
  end
end