after-action-before-render kind of interceptor (Play 1.x)
playframework, playframework-1.x
Solution
Well, if you want simplest: just insert the check code before you call render(). That is the most simple approach!
If you want something more complex, you could make a Plugin that overrides `loadTemplate` https://github.com/playframework/play/blob/master/framework/src/play/PlayPlugin.java#L157 and wraps the Template returned with your extra code. The other part of this you need to look at is the template loader: https://github.com/playframework/play/blob/master/framework/src/play/templates/TemplateLoader.java#L58 - Seems awfully convoluted, but could work.
Maybe you should explain why you are trying to do this pre-render code - there could be a better approach.
Edit: Ok, I see what you are trying to do. Yes, once the request is sent, you cannot modify cookies (aka flash). I'd suggest you avoid using cookies to maintain state between transactions - each variable adds to the HTTP transaction and is sent on every request.
Instead, I suggest you use Cache.set(Session.getId(), map) and put all the state values in the Map. Then I think you can save them during an @After
Example here; http://www.playframework.com/documentation/1.2.5/controllers#session
Problem
I know of the existence of `@Before` and `@After`, but `@After` happens to execute after the rendering of the template Almost all my controllers extends a specific class of mine, and I want to, unobtrusively, be able to execute some code in my super class that checks for some conditions and sets some flash/renderArgs after the execution of the code in the subclass, but before the rendering is done any simple way to achieve this? edit: here's a snippet of the code ``` class MyController extends Controller { @After static void checkStage() { if (xyz) { flash.put("stage", "bla"); } } } ``` my controllers all extend `MyController` but since the `checkStage` code is called AFTER the rendering is done, the `stage` flash attribute will be rendered the next time a page is rendered Actually, I would want to use `flash.now` instead of `flash.put`, but because the code `@After` code is executed after the rendering, it never shows up