add a cute API to propagate scoped typed objects with the PC

Author: gavinking

hibernate-core/src/main/java/org/hibernate/Session.java

@@ -1452,6 +1452,36 @@ public interface Session extends SharedSessionContract, EntityManager {
 	@Override
 	void setProperty(String propertyName, Object value);
 
+	/**
+	 * Set a property whose key is the type of the value.
+	 * The value may later be retrieved by calling
+	 * {@link #getProperty(Class)}. If there is already
+	 * a property value of the same type, overwrite it.
+	 *
+	 * @apiNote The application program or framework may
+	 * use this mechanism to register an application or
+	 * framework object whose scope is somehow tied to
+	 * the persistence context.
+	 *
+	 * @param value A non-null Java object
+	 *
+	 * @since 4.0
+	 */
+	@Incubating
+	void setProperty(Object value);
+
+	/**
+	 * Retrieve a property value set by a previous call to
+	 * {@link #setProperty(Object)}.
+	 * @param type The type of the property value
+	 * @return The property value, or null if no property
+	 *         value of the given type was set
+	 *
+	 * @since 4.0
+	 */
+	@Incubating
+	<T> T getProperty(Class<T> type);
+
 	/**
 	 * Create a new mutable instance of {@link EntityGraph}, with only
 	 * a root node, allowing programmatic definition of the graph from

hibernate-core/src/main/java/org/hibernate/internal/SessionImpl.java

@@ -2579,6 +2579,34 @@ public LockModeType getLockMode(Object entity) {
 
 	}
 
+	@Override
+	public void setProperty(Object value) {
+		if ( value == null ) {
+			throw new IllegalArgumentException( "Property value may not be null" );
+		}
+		setProperty( value.getClass().getName(), value );
+	}
+
+	@Override
+	public <T> T getProperty(Class<T> type) {
+		if ( properties == null ) {
+			return null;
+		}
+		else {
+			final var value = properties.get( type.getName() );
+			if ( value == null ) {
+				return null;
+			}
+			else if ( type.isInstance( value ) ) {
+				// noinspection unchecked
+				return (T) value;
+			}
+			else {
+				throw new IllegalArgumentException( "Property value is not of expected type: " + type.getName() );
+			}
+		}
+	}
+
 	@Override
 	public void setProperty(String propertyName, Object value) {
 		checkOpen();