...

@Component
public class Dependency {

    @Requires
    public FooService fs;
    
    @Unbind
    public void unbind(BazService bz) {
        //...
    }
    
    @Bind
    public void bind(BazService bz) {
        // ...
    }

  //...
}

Reacting to lifecycle state changes

Immediate components

• A POJO object (implementation object) is created as soons as the instance becomes valid
• Instances that don't provide services becomes automatically immediate

  Code Block
  xml xml title XML
  <component classname="my.service.implementation" name="my-service-impl" immediate="true"> <provides/> </component>

  Code Block
  java java title Annotations
  @Component(immediate=true) @Provides public class Implementation implements FooService { ... }

  Center

Lifecycle callbacks

<component classname="my.implementation" name="my-impl">
    <callback transition="validate" method="start" />
    <callback transition="invalidate" method="stop" />
</component>

@Component
public class Implementation {
    
    @Validate
    public void start() {
        
    }
    
    @Invalidate
    public void stop() {
        
    }
}