Class: AcidicJob::Step

Inherits:
Object
  • Object
show all
Defined in:
lib/acidic_job/step.rb

Overview

Each AcidicJob::Step requires two phases: [1] execution and [2] progression

Instance Method Summary collapse

Constructor Details

#initialize(step, run, job, step_result = nil) ⇒ Step

Returns a new instance of Step.



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# File 'lib/acidic_job/step.rb', line 6

def initialize(step, run, job, step_result = nil)
  @step = step
  @run = run
  @job = job
  @step_result = step_result
end

Instance Method Details

#execute ⇒ Object

The execution phase performs the work of the defined step



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# File 'lib/acidic_job/step.rb', line 14

def execute
  rescued_error = false
  step_callable = wrap_step_as_acidic_callable @step

  begin
    @run.with_lock do
      @step_result = step_callable.call(@run)
    end
  # QUESTION: Can an error not inherit from StandardError
  rescue StandardError => e
    rescued_error = e
    raise e
  ensure
    if rescued_error
      # If we're leaving under an error condition, try to unlock the job
      # run right away so that another request can try again.
      begin
        @run.update_columns(locked_at: nil, error_object: rescued_error)
      rescue StandardError => e
        # We're already inside an error condition, so swallow any additional
        # errors from here and just send them to logs.
        # TODO: implement and use a logger here
        puts "Failed to unlock AcidicJob::Run #{@run.id} because of #{e}."
      end
    end
  end
end

#progress ⇒ Object

The progression phase advances the job run state machine onto the next step



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# File 'lib/acidic_job/step.rb', line 43

def progress
  @run.with_lock do
    @step_result.call(run: @run)
  end
end