Class: ActiveSaga::Stores::ActiveRecord::Processor

Inherits:
Object
  • Object
show all
Defined in:
lib/active_saga/stores/active_record.rb

Overview

Coordinates execution progression within a DB transaction.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(store, execution) ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/active_saga/stores/active_record.rb', line 489

def initialize(store, execution)
  @store = store
  @execution = execution
end

Instance Attribute Details

#execution ⇒ Object (readonly)

Returns the value of attribute execution.



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# File 'lib/active_saga/stores/active_record.rb', line 487

def execution
  @execution
end

#store ⇒ Object (readonly)

Returns the value of attribute store.



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# File 'lib/active_saga/stores/active_record.rb', line 487

def store
  @store
end

Instance Method Details

#process! ⇒ Object 



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# File 'lib/active_saga/stores/active_record.rb', line 494

def process!
  return if TERMINAL_STATES.include?(execution.state)

  step = nil
  definition = nil
  workflow = nil

  check_timeouts!
  step = next_step
  return if step.nil?

  workflow_class = execution.workflow_class.constantize
  definition = workflow_class.step_definition(step.name)
  ctx = store.context_from(execution)
  workflow = workflow_class.new(context: ctx, execution_id: execution.id)

  if skip_step?(workflow, definition)
    mark_skipped(step, definition)
    store.persist_context(execution, workflow.ctx)
    ActiveSupport::Notifications.instrument("active_saga.step.skipped",
      execution_id: execution.id, step: definition.name, workflow: workflow_class.name)
    process! # continue to next
    return
  end

  attempt = step.attempts.to_i + 1
  now = store.clock.call
  step.update!(state: "running", attempts: attempt, started_at: now, scheduled_at: nil)
  execution.update!(state: "running", cursor_step: definition.name)

  ActiveSupport::Notifications.instrument("active_saga.step.started",
    execution_id: execution.id,
    workflow: workflow_class.name,
    step: definition.name,
    attempt:) do
    result = execute_step(workflow, definition, step)

    case result
    when :waiting
      # Wait steps or async initialization indicated waiting state.
      store.persist_context(execution, workflow.ctx)
    when :complete
      store.persist_context(execution, workflow.ctx)
      step.update!(state: "completed", completed_at: store.clock.call)
      ActiveSupport::Notifications.instrument("active_saga.step.completed",
        execution_id: execution.id, workflow: workflow_class.name, step: definition.name)
      new_state = next_state_after(step)
      execution.update!(state: new_state, cursor_step: next_step_name(step))
      ActiveSupport::Notifications.instrument("active_saga.execution.completed",
        execution_id: execution.id,
        workflow: execution.workflow_class) if new_state == "completed"
      process!
    else
      # Synchronous result returned.
      store.persist_context(execution, workflow.ctx)
      step.update!(state: "completed", completed_at: store.clock.call)
      ActiveSupport::Notifications.instrument("active_saga.step.completed",
        execution_id: execution.id, workflow: workflow_class.name, step: definition.name, result: result)
      new_state = next_state_after(step)
      execution.update!(state: new_state, cursor_step: next_step_name(step))
      ActiveSupport::Notifications.instrument("active_saga.execution.completed",
        execution_id: execution.id,
        workflow: execution.workflow_class) if new_state == "completed"
      process!
    end
  end
rescue => error
  raise if step.nil? || definition.nil? || workflow.nil?

  handle_error(step, definition, workflow, error)
end