[#1780] add operations for obtaining the current sessions from the context

this will make it easier to implement the necessary Quarkus integration

Author: gavinking

hibernate-reactive-core/src/main/java/org/hibernate/reactive/mutiny/Mutiny.java

@@ -2471,6 +2471,31 @@ default <T> Uni<T> withStatelessTransaction(Function<StatelessSession, Uni<T>> w
 		 */
 		Statistics getStatistics();
 
+		/**
+		 * Return the current instance of {@link Session}, if any.
+		 * A current session exists only when this method is called
+		 * from within an invocation of {@link #withSession(Function)}
+		 * or {@link #withTransaction(Function)}.
+		 *
+		 * @return the current instance, if any, or {@code null}
+		 *
+		 * @since 3.0
+		 */
+		Session getCurrentSession();
+
+		/**
+		 * Return the current instance of {@link Session}, if any.
+		 * A current session exists only when this method is called
+		 * from within an invocation of
+		 * {@link #withStatelessSession(Function)} or
+		 * {@link #withStatelessTransaction(Function)}.
+		 *
+		 * @return the current instance, if any, or {@code null}
+		 *
+		 * @since 3.0
+		 */
+		StatelessSession getCurrentStatelessSession();
+
 		/**
 		 * Destroy the session factory and clean up its connection pool.
 		 */

hibernate-reactive-core/src/main/java/org/hibernate/reactive/mutiny/impl/MutinySessionFactoryImpl.java

@@ -148,6 +148,16 @@ private CompletionStage<ReactiveConnection> connection(String tenantId) {
 				: connectionPool.getConnection( tenantId );
 	}
 
+	@Override
+	public Mutiny.Session getCurrentSession() {
+		return context.get( contextKeyForSession );
+	}
+
+	@Override
+	public Mutiny.StatelessSession getCurrentStatelessSession() {
+		return context.get( contextKeyForStatelessSession );
+	}
+
 	@Override
 	public <T> Uni<T> withSession(Function<Mutiny.Session, Uni<T>> work) {
 		Objects.requireNonNull( work, "parameter 'work' is required" );

hibernate-reactive-core/src/main/java/org/hibernate/reactive/stage/Stage.java

@@ -26,7 +26,6 @@
 import org.hibernate.jpa.internal.util.FlushModeTypeHelper;
 import org.hibernate.proxy.HibernateProxy;
 import org.hibernate.query.Page;
-import org.hibernate.query.Query;
 import org.hibernate.query.criteria.HibernateCriteriaBuilder;
 import org.hibernate.query.criteria.JpaCriteriaInsert;
 import org.hibernate.reactive.common.AffectedEntities;
@@ -2508,6 +2507,31 @@ default <T> CompletionStage<T> withStatelessTransaction(Function<StatelessSessio
 		 */
 		Statistics getStatistics();
 
+		/**
+		 * Return the current instance of {@link Session}, if any.
+		 * A current session exists only when this method is called
+		 * from within an invocation of {@link #withSession(Function)}
+		 * or {@link #withTransaction(Function)}.
+		 *
+		 * @return the current instance, if any, or {@code null}
+		 *
+		 * @since 3.0
+		 */
+		Session getCurrentSession();
+
+		/**
+		 * Return the current instance of {@link Session}, if any.
+		 * A current session exists only when this method is called
+		 * from within an invocation of
+		 * {@link #withStatelessSession(Function)} or
+		 * {@link #withStatelessTransaction(Function)}.
+		 *
+		 * @return the current instance, if any, or {@code null}
+		 *
+		 * @since 3.0
+		 */
+		StatelessSession getCurrentStatelessSession();
+
 		/**
 		 * Destroy the session factory and clean up its connection pool.
 		 */

hibernate-reactive-core/src/main/java/org/hibernate/reactive/stage/impl/StageSessionFactoryImpl.java

@@ -138,6 +138,16 @@ private CompletionStage<ReactiveConnection> connection(String tenantId) {
 				: connectionPool.getConnection( tenantId );
 	}
 
+	@Override
+	public Stage.Session getCurrentSession() {
+		return context.get( contextKeyForSession );
+	}
+
+	@Override
+	public Stage.StatelessSession getCurrentStatelessSession() {
+		return context.get( contextKeyForStatelessSession );
+	}
+
 	@Override
 	public <T> CompletionStage<T> withSession(Function<Stage.Session, CompletionStage<T>> work) {
 		Objects.requireNonNull( work, "parameter 'work' is required" );