使用Reactor选择与键匹配的事件

Question

使用reactor(https://github.com/reactor/reactor)我通知一些事件,如

 commandReactor.notify("CREATE_CUSTOMER", Event.wrap(customer));
 commandReactor.notify("CREATE_ORDER", Event.wrap(order));

如何实现选择以"CREATE"开头的所有事件的选择器？就像是

@Selector(value = "CREATE*", reactor = "@commandReactor")

提前致谢.

Answer 1

你可以使用RegexSelector[1]来做到这一点:

    commandReactor.notify("CREATE_(.+)", Event.wrap(obj));

或者,使用注释:

    @Selector(value = "CREATE_(.+)", type = SelectorType.REGEX)

然后在你的处理器,你可以在头寻找检查捕获组group1到groupN:

new Consumer<Event<Object>>>() {
  public void accept(Event<?> ev) {
    String type = ev.getHeaders().get("group1");
    if("CUSTOMER".equals(type)) {
      // handle customers
    } else if("ORDER".equals(type)) {
      // handle orders
    }
}

[1] - http://reactor.github.io/docs/api/reactor/event/selector/RegexSelector.html