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jeremybenn |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<!-- package.html
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. -->
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<html>
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<head><title>GNU Classpath - org.omg.CORBA</title></head>
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<body>
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This package provides the support of <a href="http://www.CORBA.org">CORBA</a>;
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see <a href="#overview">overview</a> of the implemented functionality.
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<p>
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CORBA a system that applications use to work over networks. CORBA messages
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are binary, not text oriented. They practically cary no "data wrapping"
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information like XML <opening> </closing> tags. Hence CORBA
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objects easier exchange large amounts of binary data. CORBA can work
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in such data-intensive application areas as telecommunications or radio
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broadcasting. Java programs connect to CORBA objects without care
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about what platform they run on, where they exist in the network, or what
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language they were written in. The remote CORBA objects appear to the
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programmer as the ordinary Java objects and can be passed as
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parameters in both remote or local method invocations.
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</p><p>
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The CORBA processing unit is divided into {@link org.omg.CORBA.Object}
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that is exposed to the client and the servant
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({@link org.omg.PortableServer.Servant} where the method, invoked on
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object, is finally delegated. It can be multiple objects per servant or
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multiple servants per object. The servant for particular object or
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even particular call can be dynamically chosen at run time using
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{@link org.omg.PortableServer.ServantManager}.
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</p><p>
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All stages of both local and remote invocations on CORBA objects can be
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monitored and modified using {@link org.omg.PortableInterceptor.Interceptor}.
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The interceptors can add an extra data to the CORBA message (these data
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can be later accessed by other interceptor on remote side).
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</p>
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<a name="overview">
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<h4>Overview of the currently implemented CORBA functionality</h4>
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The CORBA implementation in the Classpath project is now a working
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prototype.
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<ul>
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<li>This prototype is interoperable with Sun's implementation v 1.4,
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transferring object references, primitive types, narrow and wide strings,
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arrays, structures and trees between these two platforms.
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</li>
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<li>The prototype provides interoperable support for the Abstract interface
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and Value types. Those appear in 1.3, being a feature of CORBA 2.3.
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</li>
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<li>The remote exceptions are also transferred and handled as expected.
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</li>
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<li>The support for parsing stringified object references (IORs), both
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Big and Little Endian encoded, is implemented.
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</li>
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<li>The redirection commands works, LOCATION_FORWARD_PERM changing the
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target address until the application is restarted and LOCATION_FORWARD
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redirecting for the current session only.
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</li>
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<li>Both Little and Big Endian encoded messages are accepted. The encoding
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of the sent messages is the same as used in the stringified IOR reference
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of that object or Big Endian, if no such data available.
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</li>
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<li>You can use both request-oriented (based on {@link org.omg.CORBA.Request}
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and stream-oriented (based on {@link org.omg.CORBA.portable.ObjectImpl}
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invocation models. The current release includes the working examples,
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demonstrating the client-server communication using both methods.
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</li>
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<li>These examples also show, how to use the Classpath naming service.
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</li>
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<li>The IDL compiler is not yet written (and not even started), but as a
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side effect of the required compatibility, the implementation seems
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accepting the output of the Sun's idlj.
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</li>
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<li>The Portable Object Adapter is already released. For details on POA,
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see the {@link org.omg.PortableServer} package.</li>
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<li>We provide the implementation of the {@link org.omg.DynamicAny}
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package. ORB returns the working DynAnyFactory that produces working
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DynAny's as defined in OMG specification.</li>
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<li>The Portable Interceptor is also complete. See
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{@link org.omg.PortableInterceptor} package for details how to register
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and use CORBA interceptors.
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<li>All GNU Classpath classes in omg.org namespace are newly written using
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the OMG .pdf document (Version 3.0.3, formal/04-03-12).
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</li>
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</ul>
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@author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
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</body>
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</html>
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