如何处理多种期货的决议？

Question

我有一个看起来如下的未来函数，其中this._executing.set()在数据库集合中设置一个值：

Cylon._send = function (command) {
  let future = new Future();
  this._executing.set(true);
  // ... waits for an "okay" on `commands` socket before resolving.
  future.resolve(() => this._executing.set(false));
  return future;
}.future();

我有另一种方法可以使用其中两种方法。

Cylon.executeSubroutine = function (subroutine, expression) {
  let execFuture = new Future();
  let commandFuture = this._send(`XQ#${subroutine}`);
  commandFuture.resolve(() => this._executing.set(true)));
  execFuture.resolve(() => this._executing.set(false));
  // execFuture waits on `expression` on `messages` socket before resolving.
  Future.wait(commandFuture, execFuture);
}

当我记录状态时，它会执行以下操作。

executing set to true
executing set to true
executing set to false
executing set to false

为什么这样做？我想回调是按照不正确的顺序设置的，但我不确定如何正确地做到这一点。