ama-team / voxengine-scenario-framework

function Branch (options) {

  var result = new Future()

  var triggered = false

  var loggerName = 'ama-team.vsf.execution.transition.branch'

  var logger = Slf4j.factory(options.logger, loggerName)

  logger.attach('name', options.name)

  function run (origin, hints, token) {

    if (triggered) {

      var message = 'Tried to run execution branch ' + options.name + ' twice'

      throw new Errors.IllegalStateError(message)

    }

    triggered = true

    logger.debug('Launched')

    options.executor.runHandler(options.handler, [origin, hints], token)

      .then(function (value) {

        logger.debug('Execution branch has finished with {}', value)

        result.resolve(value)

      }, function (reason) {

        logger.debug('Execution branch has failed with reason {}', reason)

        result.reject(reason)

      })

    return result

  }

  /**

   * Runs execution branch.

   *

   * @param {TState} origin

   * @param {THints} hints

   * @param {CancellationToken} [token]

   *

   * @return {Thenable}

   */

  this.run = run

}