[jboss-dev-forums] [Design the new POJO MicroContainer] - Annotations scanning part 2
I'm slowly adding more and more tests to this (resolved) issue:
- http://www.jboss.com/index.html?module=bb&op=viewtopic&t=134098
I've added a deployer that knows how to scan newly added @Bean and @BeanFactory
annotations - corresponding to MC beans and beanfactories.
The code that does this is pretty simple:
| public void deploy(DeploymentUnit unit, AnnotationEnvironment env) throws
DeploymentException
| {
| Set<Class<?>> beans = env.classIsAnnotatedWith(Bean.class);
|
then you can do what ever you like with that information. ;-)
This is what I do in my case (create new BeanMetaData if it doesn't exist yet):
| for (Class<?> beanClass : beans)
| {
| Bean bean = beanClass.getAnnotation(Bean.class);
| String name = bean.name();
| if (name == null)
| throw new IllegalArgumentException("Null bean name: " +
beanClass);
|
| DeploymentUnit component = components.get(name);
| BeanMetaData bmd = null;
| if (component != null)
| bmd = component.getAttachment(BeanMetaData.class);
|
| if (bmd == null)
| {
| BeanMetaDataBuilder builder = BeanMetaDataBuilder.createBuilder(name,
beanClass.getName());
| String[] aliases = bean.aliases();
| if (aliases != null && aliases.length > 0)
| builder.setAliases(new
HashSet<Object>(Arrays.asList(aliases)));
| builder.setMode(bean.mode())
| .setAccessMode(bean.accessMode())
| .setAutowireType(bean.autowireType())
| .setErrorHandlingMode(bean.errorHandlingMode())
| .setAutowireCandidate(bean.autowireCandidate());
|
| addBeanComponent(unit, builder.getBeanMetaData());
| }
|
For all those who missed recent annotations scanning work, this is the class that should
be of interest - AnnotationEnvironment - simply pull it out from the right DeploymentUnit
as attachment:
| /**
| * Information holder about annotation processing.
| *
| * @author <a href="mailto:ales.justin@jboss.com">Ales
Justin</a>
| */
| public interface AnnotationEnvironment
| {
| /**
| * Get all classes annotated with annotation param.
| *
| * @param annotation the annotation we're querying for
| * @return set of matching classes
| */
| Set<Class<?>> classIsAnnotatedWith(Class<? extends Annotation>
annotation);
|
| /**
| * Get all classes who have some constructor annotated with annotation param.
| *
| * @param annotation the annotation we're querying for
| * @return set of matching classes
| */
| <A extends Annotation> Set<Element<A, Constructor>>
classHasConstructorAnnotatedWith(Class<A> annotation);
|
| /**
| * Get all classes who have some field annotated with annotation param.
| *
| * @param annotation the annotation we're querying for
| * @return set of matching classes
| */
| <A extends Annotation> Set<Element<A, Field>>
classHasFieldAnnotatedWith(Class<A> annotation);
|
| /**
| * Get all classes who have some method annotated with annotation param.
| *
| * @param annotation the annotation we're querying for
| * @return set of matching classes
| */
| <A extends Annotation> Set<Element<A, Method>>
classHasMethodAnnotatedWith(Class<A> annotation);
|
| /**
| * Get all classes who have some method's/constructor's parameter annotated
with annotation param.
| *
| * @param annotation the annotation we're querying for
| * @return set of matching classes
| */
| <A extends Annotation> Set<Element<A, AccessibleObject>>
classHasParameterAnnotatedWith(Class<A> annotation);
| }
|
The code handles class loading lazily (Javassist + keeping weak ref to classloader from
unit), meaning class won't get loaded until you actually need the information, e.g.
AOP could modify it before.
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