TaskSequencer using react

TaskSequencer

//
// aciv-core

package aciv.util {

import aspire.util.F;

import react.Future;
import react.Promise;

public class TaskSequencer
{
    /**
     * Adds a task to the scheduler. 'task' is a function that optionally receives a
     * Promise object. If task takes a Promise, it must call succeed on that Promise when
     * its work is complete. If task takes no arguments, then it's considered complete
     * as soon as it returns.
     */
    public function addTask (task :Function) :void {
        if (task.length == 1) {
            var promise :Promise = Promise.create();
            var last :Future = _last;
            _last = promise;
            last.onSuccess(F.callback(task, promise));
        } else {
            _last.onSuccess(F.callback(task));
        }
    }

    protected var _last :Future = Future.success();
}
}