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jeremybenn |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<!-- package.html - describes classes in java.rmi.activation package.
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Copyright (C) 2002, 2006 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 - java.rmi.activation</title></head>
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<body>
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In the previous Classpath releases, an instance of a UnicastRemoteObject
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could be accessed from a server that:
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<ul>
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<li>has created an instance of that object<li>
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<li>has been running <i>all<i> the time</li>
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</ul>
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<p>The the activation system allows to activate and execute the object
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implementation on demand rather than running all time. If the activation
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system is persistent, the server can be terminated and then restarted.
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The clients, still holding remote references to the server side
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activatable objects, will activate those objects again. The server side
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objects will be reinstantiated (activated) during the first call of any
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remote method of such object.
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</p><p>
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The RMI client code for activatable objects is no different than the code for
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accessing non-activatable remote objects. Activation is a server-side feature.
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</p><p>
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In order for an object to be activated, the "activatable" object class
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(independently if it extends the {@link Activatable} class or not) defines a
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special public constructor that takes two arguments, its activation identifier
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({@link ActivationID}) and its activation data ({@link java.rmi.MarshalledObject}),
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supplied in the activation descriptor used during registration. When an
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activation group activates a remote object, it constructs the object via
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this special constructor. The remote object implementation may use the
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activation data to initialize itself in a needed manner. The remote object may
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also retain its activation identifier, so that it can inform the activation
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group when it becomes inactive (via a call to the Activatable.inactive method).
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</p>
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@author Audrius Meskauskas (audriusa@bioinformatics.org) (from empty)
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</body>
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</html>
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