Class: BackgroundQueue::Worker::WorkerLoader

Inherits:
Object
  • Object
show all
Defined in:
lib/background_queue/worker/worker_loader.rb

Overview

looks after loading and caching worker classes. worker classes sit in BackgroundQueue::Worker::Config.worker_path directory

Defined Under Namespace

Classes: WorkerEntry

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ WorkerLoader

Returns a new instance of WorkerLoader.



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# File 'lib/background_queue/worker/worker_loader.rb', line 6

def initialize
  @worker_entries = {}
end

Class Method Details

.get_worker(worker_name) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 10

def self.get_worker(worker_name)
  @@worker_loader ||= BackgroundQueue::Worker::WorkerLoader.new
  @@worker_loader.get_worker(worker_name)
end

Instance Method Details

#get_worker(worker_name) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 15

def get_worker(worker_name)
  worker_entry = get(worker_name)
  if worker_entry.nil?
    worker_entry = load_worker(worker_name)
    set(worker_entry)
  else
    reload_if_updated(worker_entry)
  end
  worker_entry.worker
end

#load_class(worker_name, path) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 38

def load_class(worker_name, path)
  class_name = worker_class_name(worker_name)
  begin
    eval("#{class_name}.new")
  rescue NameError=>e
    raise "#{path} did not define #{class_name}"
  end
end

#load_file(path) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 34

def load_file(path)
  load(path)
end

#load_worker(worker_name) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 26

def load_worker(worker_name)
  path = worker_path(worker_name)
  load_file(path)
  datestamp = File.mtime(path)
  worker = load_class(worker_name, path)
  WorkerEntry.new(worker, path, datestamp, worker_name)
end

#reload_if_updated(worker_entry) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 55

def reload_if_updated(worker_entry)
  ds = File.mtime(worker_entry.path)
  if ds != worker_entry.datestamp
    load_file(worker_entry.path)
    worker_entry.worker = load_class(worker_entry.name, worker_entry.path)
    worker_entry.datestamp = ds
  end
end

#worker_class_name(worker_name) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 47

def worker_class_name(worker_name)
  worker_name.split('_').collect!{ |w| w.capitalize }.join
end

#worker_path(worker_name) ⇒ Object 



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# File 'lib/background_queue/worker/worker_loader.rb', line 51

def worker_path(worker_name)
  File.join(BackgroundQueue::Worker::Config.worker_path, "#{worker_name}.rb")
end