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 }