PostConstruct method Direct Injection

[SentryMan]

generates the lookup and fetches beans for PostConstruct lifecycle methods. (Before we could only inject the BeanScope)

Given:

@Singleton
public class Minos {

  @PostConstruct
  void prepareThyself(Serpent serpent, Consumer<String> c, BeanScope b) {}
}

the following is generated:

@Generated("io.avaje.inject.generator")
public final class Minos$DI  {

  public static final Type TYPE_ConsumerString =
      new GenericType<Consumer<String>>(){}.type();

  public static void build(Builder builder) {
    if (builder.isBeanAbsent(Minos.class)) {
      var bean = new Minos();
      var $bean = builder.register(bean);
      builder.addPostConstruct(b -> $bean.prepareThyself(b.get(Serpent.class,"!serpent"), b.get(TYPE_ConsumerString), b));
    }
  }
}

[rbygrave]

Why? What is the use case where this makes sense to do?

[SentryMan]

Well, we already accept a bean scope as a parameter, this just eases the process of using the existing feature.

[SentryMan]

But to answer you directly, a use case could be to send an event to any @Observes listeners.

[rbygrave]

Well, we already accept a bean scope as a parameter, this just eases the process of using the existing feature.

Not quite in that the Builder isn't the same thing as the BeanScope. The BeanScope is the immutable collection of beans in the scope, and the Builder is expected to be lived for the duration of building the scope. That is, the side effect of this change is that there are lifecycle methods that register that keep a reference to the Builder.

[SentryMan]

That is, the side effect of this change is that there are lifecycle methods that register that keep a reference to the Builder.

No?

 builder.addPostConstruct(b -> $bean.prepareThyself(b.get(Serpent.class,"!serpent"), b.get(TYPE_ConsumerString), b));

b here is the fully constructed beanscope, there's no reference to the builder.

We see this is the actual beanscope here

avaje-inject/inject/src/main/java/io/avaje/inject/spi/DBeanScope.java

Lines 246 to 248 in fa79dda

	for (final var consumer : postConstructConsumers) {
	consumer.accept(this);
	}

[rbygrave]

b here is the fully constructed beanscope, there's no reference to the builder.

Ah cool !!