Programmatic lookup improvements, introduce Handle interface.

api/src/main/java/jakarta/enterprise/inject/Instance.java

@@ -21,6 +21,7 @@
 import java.util.stream.Stream;
 import java.util.stream.StreamSupport;
 
+import jakarta.enterprise.inject.spi.Bean;
 import jakarta.enterprise.util.AnnotationLiteral;
 import jakarta.enterprise.util.TypeLiteral;
 import jakarta.inject.Provider;
@@ -227,4 +228,88 @@ default boolean isResolvable() {
      */
     void destroy(T instance);
 
+    /**
+     * Obtains an initialized contextual reference handle for a bean that has the required type and qualifiers and is
+     * eligible for injection. Throws exceptions if there is no such bean or more than one.
+     *
+     * <p>
+     * The contextual reference is obtained lazily, i.e. when first needed.
+     * </p>
+     *
+     * @return a new {@link Handle} instnace
+     * @throws UnsatisfiedResolutionException if there is no bean with given type and qualifiers
+     * @throws AmbiguousResolutionException if there is more than one bean given type and qualifiers
+     */
+    Handle<T> getHandle();
+
+    /**
+     * Allows iterating over contextual reference handles for all beans that have the required type and required qualifiers and are eligible
+     * for injection.
+     *
+     * <p>
+     * Note that the returned {@link Iterable} is stateless. Therefore, each {@link Iterable#iterator()} produces a new set of handles.
+     * </p>
+     *
+     * @return a new iterable
+     */
+    Iterable<Handle<T>> handles();
+
+    /**
+     *  Returns stream of {@link Handle} objects.
+     *
+     * @return a new stream of contextual reference handles
+     */
+    default Stream<Handle<T>> handlesStream() {
+        return StreamSupport.stream(handles().spliterator(), false);
+    }
+
+    /**
+     * This interface represents a contextual reference handle.
+     * <p>
+     * Allows to inspect the metadata of the relevant bean before resolving its contextual reference and also to destroy
+     * the underlying contextual instance.
+     * </p>
+     *
+     * @author Matej Novotny
+     * @param <T> the required bean type
+     */
+    interface Handle<T> extends AutoCloseable {
+
+        /**
+         * The contextual reference is obtained lazily, i.e. when first needed.
+         *
+         * @return the contextual reference
+         * @see Instance#get()
+         * @throws IllegalStateException If the producing {@link Instance} does not exist
+         */
+        T get();
+
+        /**
+         *
+         * @return the bean metadata
+         */
+        Bean<T> getBean();
+
+        /**
+         * Destroy the contextual instance.
+         *
+         * It's a no-op if:
+         * <ul>
+         * <li>called multiple times</li>
+         * <li>if the producing {@link Instance} does not exist</li>
+         * <li>if the handle does not hold a contextual reference, i.e. {@link #get()} was never called</li>
+         * </ul>
+         *
+         * @see Instance#destroy(Object)
+         */
+        void destroy();
+
+        /**
+         * Delegates to {@link #destroy()}.
+         */
+        @Override
+        void close();
+
+    }
+
 }

api/src/test/java/org/jboss/cdi/api/test/ClosableCDIProvider.java

@@ -84,6 +84,16 @@ public void destroy(Object instance) {
 
         }
 
+        @Override
+        public Handle<Object> getHandle() {
+            return null;
+        }
+
+        @Override
+        public Iterable<Handle<Object>> handles() {
+            return null;
+        }
+
         @Override
         public Iterator<Object> iterator() {
             return null;

api/src/test/java/org/jboss/cdi/api/test/DummyCDIProvider.java

@@ -79,6 +79,16 @@ public void destroy(Object instance) {
 
         }
 
+        @Override
+        public Handle<Object> getHandle() {
+            return null;
+        }
+
+        @Override
+        public Iterable<Handle<Object>> handles() {
+            return null;
+        }
+
         @Override
         public Iterator<Object> iterator() {
             return null;

api/src/test/java/org/jboss/cdi/api/test/DummyCDIProvider2.java

@@ -80,6 +80,16 @@ public void destroy(Object instance) {
 
         }
 
+        @Override
+        public Handle<Object> getHandle() {
+            return null;
+        }
+
+        @Override
+        public Iterable<Handle<Object>> handles() {
+            return null;
+        }
+
         @Override
         public Iterator<Object> iterator() {
             return null;

api/src/test/java/org/jboss/cdi/api/test/privileged/FakeCDIProvider.java

@@ -80,6 +80,16 @@ public void destroy(Object instance) {
 
         }
 
+        @Override
+        public Handle<Object> getHandle() {
+            return null;
+        }
+
+        @Override
+        public Iterable<Handle<Object>> handles() {
+            return null;
+        }
+
         @Override
         public Iterator<Object> iterator() {
             return null;

spec/src/main/asciidoc/core/injectionandresolution.asciidoc

@@ -623,6 +623,9 @@ public interface Instance<T> extends Iterable<T>, Provider<T> {
 
     void destroy(T instance);
 
+    Handle<T> getHandle();
+    Iterable<Handle<T>> handles();
+    Stream<Handle<T>> handlesStream();
 
 }
 ----
@@ -687,6 +690,53 @@ The bean instance passed to `destroy()` should be a dependent scoped bean instan
 Applications are encouraged to always call `destroy()` when they no longer require an instance obtained from `Instance`. All built-in normal scoped contexts support destroying bean instances.
 An `UnsupportedOperationException` is thrown if the active context object for the scope type of the bean does not support destroying bean instances.
 
+The `getHandle()` method must:
+
+* Return an initialized contextual reference `Handle<T>` for a bean that has the required type and qualifiers and is eligible for injection. The contextual reference must be resolved lazily, i.e. when first needed. <<handle_interface>> is described in a separate paragraph.
+* Throw `UnsatisfiedResolutionException` if there is no bean with given type and qualifiers
+* Throw `AmbiguousResolutionException` if there is more than one bean given type and qualifiers
+
+The `handles()` method must:
+
+* Allow iterating over contextual reference handles for all beans that have the required type and required qualifiers and are eligible for injection.
+* Return stateless `Iterable`. Therefore, each `Iterable#iterator()` produces a new set of handles.
+
+The `handlesStream()` is a `Stream` equivalent of the aforementioned `handles()` method.
+
+[[handle_interface]]
+===== The `Handle` interface
+
+`Handle` is an interface representing a contextual reference handle.
+It is an abstraction allowing inspection of bean metadata via `Bean<?>` objects.
+Handles have to resolve their contextual references lazily, i.e. when their `get()` method is invoked.
+Last but not least, this interface can be used to destroy the contextual instance once not needed.
+
+[source, java]
+----
+public interface Handle<T> extends AutoCloseable {
+
+        T get();
+        Bean<T> getBean();
+        void destroy();
+        void close();
+
+}
+----
+
+The `get()` method returns a contextual reference object. The contextual reference is resolved lazily.
+
+The `getBean()` method returns the `Bean` object representing metadata of the given contextual instance.
+
+The `destroy()` method destroys the contextual instance and is a no-op if:
+
+* called multiple times
+* the producing `Instance` does not exist
+* the handle does not hold a contextual reference, i.e. `get()` was never called
+
+The rules for destroying instances are the same as with `Instance#destroy()`.
+
+The `close()` method delegates to the aforementioned `destroy()` method.
+
 [[builtin_instance]]
 
 ==== The built-in `Instance`