https://my.oschina.net/andylucc/blog/608499
http://ifeve.com/promise-future-callback/
https://github.com/hprose/hprose-java/wiki/%E5%BC%82%E6%AD%A5%E7%BC%96%E7%A8%8B%E2%80%94%E2%80%94Promise
https://juejin.im/post/5b126065e51d4506bd72b7cc
https://www.infoq.cn/article/design-patterns-promise https://www.cnkirito.moe/future-and-promise/
interface Closure<E, T> {
public T callback(E in);
public void error(Error err);
}
public class Promise<E> {
protected int status = 0;
protected ArrayList<Closure> jobList = new ArrayList<>();
protected Closure<Promise, Void> job;
protected E data;
public Promise(Closure job){
this.job = job;
// 暴露 resolve, reject
this.job.callback(this);
}
private Promise() {
}
public void resolve(E e){
}
public void reject(String err){
}
protected void reject(Error err){
}
public Promise done(Closure c){
return (new Promise<E>());
}
public Promise error(Closure c){
return (new Promise<E>());
}
}
