bpmn-elements/src/tasks/ServiceImplementation.js

Executable workflow elements based on BPMN 2.0

import ExecutionScope from '../activity/ExecutionScope.js';

export default function ServiceImplementation(activity) {
  this.type = `${activity.type}:implementation`;
  this.implementation = activity.behaviour.implementation;
  this.activity = activity;
}

ServiceImplementation.prototype.execute = function execute(executionMessage, callback) {
  const activity = this.activity;
  const implementation = this.implementation;
  const serviceFn = activity.environment.resolveExpression(implementation, executionMessage);

  if (typeof serviceFn !== 'function') return callback(new Error(`Implementation ${implementation} did not resolve to a function`));

  serviceFn.call(activity, ExecutionScope(activity, executionMessage), (err, ...args) => {
    callback(err, args);
  });
};