Add hooks for plugins about backburner HOT 4 CLOSED

michaeldwan/stalker@3862676

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The available hooks in Resque:

• before_enqueue: Called with the job args before a job is placed on the queue.
  If the hook returns false, the job will not be placed on the queue.
• after_enqueue: Called with the job args after a job is placed on the queue.
  Any exception raised propagates up to the code which queued the job.
• before_dequeue: Called with the job args before a job is removed from the queue.
  If the hook returns false, the job will not be removed from the queue.
• after_dequeue: Called with the job args after a job was removed from the queue.
  Any exception raised propagates up to the code which dequeued the job.
• before_perform: Called with the job args before perform. If it raises
  Resque::Job::DontPerform, the job is aborted. If other exceptions
  are raised, they will be propagated up the the Resque::Failure
  backend.
• after_perform: Called with the job args after it performs. Uncaught
  exceptions will propagate up to the Resque::Failure backend.
• around_perform: Called with the job args. It is expected to yield in order
  to perform the job (but is not required to do so). It may handle exceptions
  thrown by perform, but any that are not caught will propagate up to the
  Resque::Failure backend.
• on_failure: Called with the exception and job args if any exception occurs
  while performing the job (or hooks), this includes Resque::DirtyExit.

Hooks are easily implemented with superclasses or modules. A superclass could
look something like this.

class LoggedJob
  def self.before_perform_log_job(*args)
    Logger.info "About to perform #{self} with #{args.inspect}"
  end
end

class MyJob < LoggedJob
  def self.perform(*args)
     ...
  end
end

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Progress here https://github.com/nesquena/backburner/tree/hooks

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Finished and available in 0.2.0, see https://github.com/nesquena/backburner/blob/master/HOOKS.md for more details

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