T - public interface WeldInstance<T> extends Instance<T>
Instance.
In the following example we filter out beans which are not Dependent then sort the beans by priority and use the handler whose bean has the highest
priority (according to getPriorityComparator()) to obtain the hello string. Note that contextual references for beans with lower priority are not
created at all.
@ApplicationScoped
class Hello {
@Inject
WeldInstance<HelloProvider> instance;
String hello() {
HelloProvider helloProvider = instance.handlersStream().filter(h -> h.getBean().getScope().equals(Dependent.class))
.sorted(instance.getPriorityComparator()).findFirst().map(Handler::get).orElse(null);
if (helloProvider != null)
return helloProvider.getHello();
return "No hello provider found!";
}
}
| Modifier and Type | Interface and Description |
|---|---|
static interface |
WeldInstance.Handler<T>
This interface represents a contextual reference handler.
|
| Modifier and Type | Method and Description |
|---|---|
WeldInstance.Handler<T> |
getHandler()
Obtains an initialized contextual reference handler for the bean that has the required type and required qualifiers and is eligible for injection.
|
Comparator<WeldInstance.Handler<?>> |
getPriorityComparator()
The returned comparator sorts handlers by priority in descending order.
|
Iterable<WeldInstance.Handler<T>> |
handlers()
Allows to iterate over contextual reference handlers for all the beans that have the required type and required qualifiers and are eligible
for injection.
|
default Stream<WeldInstance.Handler<T>> |
handlersStream() |
WeldInstance<T> |
select(Annotation... qualifiers)
Obtains a child Instance for the given additional required qualifiers.
|
<U extends T> |
select(Class<U> subtype,
Annotation... qualifiers)
Obtains a child Instance for the given required type and additional required qualifiers.
|
<X> WeldInstance<X> |
select(Type subtype,
Annotation... qualifiers)
Obtains a child
Instance for the given required type and additional required qualifiers. |
<U extends T> |
select(TypeLiteral<U> subtype,
Annotation... qualifiers)
Obtains a child Instance for the given required type and additional required qualifiers.
|
destroy, isAmbiguous, isResolvable, isUnsatisfied, streamforEach, iterator, spliteratorWeldInstance.Handler<T> getHandler()
The contextual reference is obtained lazily, i.e. when first needed.
UnsatisfiedResolutionExceptionAmbiguousResolutionExceptionIterable<WeldInstance.Handler<T>> handlers()
Note that the returned Iterable is stateless and so each Iterable.iterator() produces a new set of handlers.
default Stream<WeldInstance.Handler<T>> handlersStream()
Comparator<WeldInstance.Handler<?>> getPriorityComparator()
javax.annotation.Priority has the priority of value javax.annotation.Priority#value()Prioritized has the priority of value Prioritized.getPriority()WeldInstance<T> select(Annotation... qualifiers)
InstanceObtains a child Instance for the given additional required qualifiers.
<U extends T> WeldInstance<U> select(Class<U> subtype, Annotation... qualifiers)
InstanceObtains a child Instance for the given required type and additional required qualifiers.
<U extends T> WeldInstance<U> select(TypeLiteral<U> subtype, Annotation... qualifiers)
InstanceObtains a child Instance for the given required type and additional required qualifiers.
select in interface Instance<T>U - the required typesubtype - a TypeLiteral representing the required typequalifiers - the additional required qualifiers<X> WeldInstance<X> select(Type subtype, Annotation... qualifiers)
Obtains a child Instance for the given required type and additional required qualifiers.
Must be invoked on Instance<T> where T is Object.
X - the required typesubtype - a Type representing the required typequalifiers - the additional required qualifiersIllegalArgumentException - if passed two instances of the same non repeating qualifier type, or an instance of an
annotation that is not a qualifier typeIllegalStateException - if the container is already shutdownIllegalStateException - if invoked on Instance<T> where T is of any other type than ObjectCopyright © 2019 JBoss by Red Hat. All rights reserved.