playframework 1.2.x如何在开发模式下每次重载游戏时调用我的方法？

Question

I need a method to be called every time play reloads so I can use the new classes to rescan some stuff. How can I get that without developing a full blown plugin? ( I really just want to add something quick to my application and move on).

On a side note, is there any good tutorial on doing a play plugin?

thanks, Dean

Answer 1

Every time your application reloads (which may be often in Dev mode), the @onApplicationStart methods are called.

Therefore, just create a bootstrap job, using @onApplicationStart and you will achieve what you need.

You can see more on this, by looking at the Play documentation for bootstrap jobs - http://www.playframework.org/documentation/1.2.5/jobs#concepts

Answer 2

Well, if you have any method that is run alot like NoSql.em(), and NoSql is in another jar file, it will not be in the Play.classloader and in that method, I finally do a Play.classloader.getAnnotatedResources() which gives me a List and I keep comparing the first one and when it changes, I know play reloaded. For now, this sort of hack worked for me and the nosql layer stays up constantly with the in-memory nosql database now.

While @OnApplicationStart is NOT called "every" single time play reloads, you can use the above method to know when it does reload 100% of the time instead of 75% of the time which is about the case of using @OnApplicationStart.