Add a ConnectionWrapper interface to allow access to the underlying connection from a BorrowedConnectionProxy ------------------------------------------------------------------------------------------------------------- Key: HHH-1737 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1737 Project: Hibernate3 Type: Bug

Components: core Versions: 3.1.1, 3.1.2, 3.1.3 Environment: Hibernate 3.1.3, Oracle 9.2.0.4 Reporter: Nick Reid Assignee: Steve Ebersole Fix For: 3.2.1

The borrowConnection functionality now prevents us from accessing the native connection to perform necessary operations (LOB handling, OAQ integration). Instead of just returning a simple proxy the implements java.sql.Connection the proxy could additionally implement an interface that allows users to access the wrapped connection returned by the ConnectionManager. i.e. public interface BorrowedConnection extends java.sql.Connection { java.sql.Connection getTargetConnection() } public class BorrowedConnectionProxy implements InvocationHandler { private final ConnectionManager connectionManager; private boolean useable = true; public BorrowedConnectionProxy(ConnectionManager connectionManager) { this.connectionManager = connectionManager; } public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { if ( "close".equals( method.getName() ) ) { connectionManager.releaseBorrowedConnection(); return null; } if ( "getTargetConnection".equals( method.getName() ) ) { return connectionManager.getConnection(); } // should probably no-op commit/rollback here, at least in JTA scenarios if ( !useable ) { throw new HibernateException( "connnection proxy not usable after transaction completion" ); } try { return method.invoke( connectionManager.getConnection(), args ); } catch( InvocationTargetException e ) { throw e.getTargetException(); } } public static Connection generateProxy(ConnectionManager connectionManager) { BorrowedConnectionProxy handler = new BorrowedConnectionProxy( connectionManager ); return ( Connection ) Proxy.newProxyInstance( Connection.class.getClassLoader(), new Class[] { BorrowedConnection.class }, handler ); } public static void renderUnuseable(Connection connection) { if ( connection != null && Proxy.isProxyClass( connection.getClass() ) ) { InvocationHandler handler = Proxy.getInvocationHandler( connection ); if ( BorrowedConnectionProxy.class.isAssignableFrom( handler.getClass() ) ) { ( ( BorrowedConnectionProxy ) handler ).useable = false; } } } } We could always get access to the connectionManager field of the invocation handler via reflection, but this is not supportable or maintainable.