001 /* Current.java --
002 Copyright (C) 2005 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038
039 package org.omg.PortableInterceptor;
040
041 import org.omg.CORBA.portable.IDLEntity;
042
043 /**
044 * <p>
045 * The portable interceptor Current (PICurrent) contains multiple slots where an
046 * interceptor can rememeber the request - specific values between subsequent
047 * calls of the interceptor methods. In multithreaded environment, it is not
048 * possible just to store such data in the interceptor object fields.
049 * </p>
050 * <p>
051 * On the client side, it is possible to set the initial slot values by
052 * modifying slots on the Current, returend by ORB.resolve_initial_references
053 * ("PICurrent"). The returned value is narrowed with the
054 * {@link CurrentHelper#narrow}. On the subsequent invocation, made from the
055 * same thread, the interceptors will see the initial slot values as they were
056 * set using this approach.
057 * </p>
058 * <p>
059 * There are no way to set the initial values for the server side interceptors,
060 * the default values (Any with typecode TCKind.tk_null) should be always
061 * assumed.
062 * </p>
063 * <p>
064 * Since an Interceptor is running in a thread, it is running with a thread
065 * context and there is a PICurrent on that context. If the Interceptor calls
066 * ORB.resolve_initial_references ("PICurrent"), it gets the PICurrent within
067 * its thread scope. This PICurrent is different than the request scope
068 * PICurrent that the Interceptor obtains via calls to the Client- or Server-
069 * RequestInfo object.
070 * </p>
071 * <p>
072 * On the client side the PICurrent can be used to detect the recursive
073 * invocations, performed by interceptors. If one of the interceptors makes call
074 * via the same ORB, this call is then showed to all interceptors, including the
075 * interceptor that made it. To avoid infinite recursion, the during each call
076 * this interceptor can set some "recursion flag" into one of the slots of the
077 * PICurrent. If the flag is set on the entry point, this indicates a recursive
078 * call of that request.
079 * </p>
080 */
081 public interface Current extends CurrentOperations,
082 org.omg.CORBA.Current,
083 IDLEntity
084 {
085 }