#749 Add support for a @PreDestroy method on a factory, alternative to @Bean(destroyMethod)

[rbygrave]

Example:

@Factory
final class MyFactory {

  @Bean
  MyComponent myComponent() {
   ...
  }

  @PreDestroy(priority = 3000)
  void destroyMyComponent(MyComponent bean) {
    ...
  }

• ONLY valid on factory components
• An alternative to @bean(destroyMethod)
• The @PreDestroy method matches to a @bean by type only (ignores qualifiers, only 1 argument to the destroy method)

[SentryMan]

While technically I see nothing wrong, I'm not a fan of being able to have multiple @PreDestroy methods in a single class.

[rbygrave]

I'm not a fan of ...

Yes, it isn't perfect per se. I'm comfortable enough that it is intuitive enough and that we've limited this feature enough that it won't become a future regret. Time will tell.