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1: /* PortableRemoteObjectDelegate.java -- Interface supporting PortableRemoteObject 2: Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: 39: package javax.rmi.CORBA; 40: 41: import java.rmi.NoSuchObjectException; 42: import java.rmi.Remote; 43: import java.rmi.RemoteException; 44: 45: /** 46: * A delegate, implementing the functionality, provided by the 47: * {@link PortableRemoteObject}. 48: * 49: * The default delegate can be altered by setting the system property 50: * "javax.rmi.CORBA.PortableRemoteObjectClass" to the name of the alternative 51: * class that must implement {@link PortableRemoteObjectDelegate}. 52: * 53: * @author Audrius Meskauskas (AudriusA@Bioinformatics.org) 54: */ 55: public interface PortableRemoteObjectDelegate 56: { 57: /** 58: * <p> 59: * Makes the remote object <code>target</code> ready for remote 60: * communication using the same communications runtime as for the passed 61: * <code>source</code> parameter. Connection normally happens implicitly 62: * when the object is sent or received as an argument on a remote method call. 63: * </p> 64: * <p> 65: * The target object is connected to the same ORB as source by calling the 66: * {@link Stub#connect} if it is a stub or by associating its tie with an ORB 67: * if it is an implementation object. 68: * </p> 69: * 70: * @param target the target object that may be either an RMI/IDL stub or an 71: * exported RMI/IDL implementation object 72: * @param source the source object may also be either an RMI/IDL stub or an 73: * exported RMI/IDL implementation object. 74: * 75: * @throws RemoteException if the target is already connected to another ORB. 76: */ 77: void connect(Remote target, Remote source) 78: throws RemoteException; 79: 80: /** 81: * Register the passed object with the ORB runtimes, making it remotely 82: * accessible. When called on jre with no objects exported, creates a 83: * non-daemon thread that prevents jre from terminating until all objects are 84: * unexported. Also, such object cannot be collected by garbage collector. 85: * This is usually impemented via {@link Util#unexportObject} 86: * 87: * @param obj the object to export. 88: * 89: * @throws RemoteException 90: */ 91: void exportObject(Remote obj) 92: throws RemoteException; 93: 94: /** 95: * Narrows the passed object to conform to the given interface or IDL type. 96: * This method may return different instance and cannot be replaced by the 97: * direct cast. 98: * 99: * @param narrowFrom an object to narrow. 100: * @param narrowTo a type to that the object must be narrowed. 101: * 102: * @return On success, an object of type narrowTo or null, if narrowFrom = 103: * null. 104: * 105: * @throws ClassCastException if no narrowing is possible. 106: */ 107: Object narrow(Object narrowFrom, Class narrowTo) 108: throws ClassCastException; 109: 110: /** 111: * Takes a server implementation object and returns a stub object that can be 112: * used to access that server object (target). If the target is connected, the 113: * returned stub is also connected to the same ORB. If the target is 114: * unconnected, the returned stub is unconnected. 115: * 116: * @param obj a server side object. 117: * @return a stub object that can be used to access that server object. 118: * 119: * @throws NoSuchObjectException if a stub cannot be located for the given 120: * target. 121: */ 122: Remote toStub(Remote obj) 123: throws NoSuchObjectException; 124: 125: /** 126: * Deregister a currently exported server object from the ORB runtimes. The 127: * object to becomes available for garbage collection. This is usually 128: * impemented via {@link Util#unexportObject} 129: * 130: * @param obj the object to unexport. 131: * 132: * @throws NoSuchObjectException if the passed object is not currently 133: * exported. 134: */ 135: void unexportObject(Remote obj) 136: throws NoSuchObjectException; 137: }