/* Tie.java --
   Copyright (C) 2002, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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permission to link this library with independent modules to produce an
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package javax.rmi.CORBA;

import java.rmi.NoSuchObjectException;
import java.rmi.Remote;
import org.omg.CORBA.ORB;
import org.omg.CORBA.portable.InvokeHandler;

/**
 * <p>
 * A Tie serves as a CORBA Servant or implementation base. It is connected to
 * the ORB on a server side, providing the implementation of the required
 * functionality. ORB access this implementation using {@link InvokeHandler}
 * ._invoke(..). All such calls are finally delegated to the object, returned by
 * {@link #getTarget()}.
 * </p>
 * <p>
 * Ties are generated from implementations (name pattern *Impl) and have the
 * name pattern _*Impl_Tie, for instance:<br>
 * <code>rmic -keep -iiop -poa -always gnu.testlet.java.rmi.Remote.CalculatorImpl</code>
 * </p>
 * <p>
 * Ties should normally be derived from the
 * {@link org.omg.PortableServer.Servant}. Such ties are generated by
 * <code>rmic</code> compiler using <code>-poa</code> key. Ties can be also
 * derived from {@link org.omg.CORBA_2_3.portable.ObjectImpl}.
 * </p>
 *
 * @author Audrius Meskauskas (AudriusA@Bioinformatics.org)
 */
public interface Tie
  extends InvokeHandler
{
  /**
   * Get the invocation target, where all method calls should be delegated.
   *
   * @return the object, implementing methods, defined in the interface being
   * served by this Tie.
   */
  Remote getTarget();

  /**
   * Set the invocation target, where all method calls should be delegated.
   *
   * @param target the object, implementing methods, defined in the interface
   * being served by this Tie. The code, produced by a typical rmic compiler
   * usually requires the target to be an instance of the implementation from
   * that the Tie was generated.
   *
   * @throws ClassCastException if the passed parameter is not an instance of
   * the implementation from that the Tie was generated.
   */
  void setTarget(Remote target);

  /**
   * Get the ORB to that this Tie is connected.
   *
   * @see org.omg.PortableServer.Servant#_orb
   */
  ORB orb();

  /**
   * Connect this Tie to the given ORB.
   */
  void orb(ORB orb);

  /**
   * Get the object that delegates calls to this tie.
   *
   * @see org.omg.PortableServer.Servant#_this_object()
   */
  org.omg.CORBA.Object thisObject();

  /**
   * Deactivate this Tie. The tie is normally deactivated using POA mechanisms.
   * Depending on the POA policies, it may be possible to activate the Tie
   * again. The ties that are not derived from
   * {@link org.omg.PortableServer.Servant} deactivate themselves by
   * {@link ORB#disconnect}.
   *
   * @throws NoSuchObjectException if there are no objects served by this Tie,
   * or if the these objects are already deactivated.
   *
   * @see org.omg.PortableServer.POAOperations#deactivate_object
   */
  void deactivate()
    throws NoSuchObjectException;

}
