How to get UiLifeCycle instance from zk.xml

answered 2015-12-09 04:34:54 +0800

cor3000
6280 ● 2 ● 7

updated 2015-12-09 07:42:51 +0800

I'd be careful with that, since according to the documentation there should only be one instance of a UiLifeCycle-listener. Which needs to be implemented in a thread safe way. For that it's better to keep it stateless.

As an alternative you could add a callback as a component attribute to be called when the component detaches:

e.g. in your afterComponentDetached method

if(comp.hasAttribute("cleanupCallback")) {
    Runnable callback = (Runnable)comp.getAttribute("cleanupCallback");
    callback.run();
}

you can then register the callback where you create the component
Textbox mytext = new Textbox();
mytext.setAttribute("cleanupCallback", new Runnable() {
    public void run() {
        //do some cleanup here
    }
});

for java 8

mytext.setAttribute("cleanupCallback", () -> {
    //do some cleanup here
});

or

mytext.setAttribute("cleanupCallback", this::doCleanup);
...
public void doCleanup() {
    //do some cleanup here
}