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jeremybenn |
/* PersistentContext.java -- The persistent naming context.
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Copyright (C) 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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package gnu.classpath.tools.orbd;
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import gnu.CORBA.NamingService.NameTransformer;
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import gnu.CORBA.NamingService.TransientContext;
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import java.io.File;
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import org.omg.CORBA.ORB;
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import org.omg.CosNaming.NameComponent;
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import org.omg.CosNaming.NamingContext;
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import org.omg.CosNaming.NamingContextPackage.AlreadyBound;
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import org.omg.CosNaming.NamingContextPackage.CannotProceed;
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import org.omg.CosNaming.NamingContextPackage.InvalidName;
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import org.omg.CosNaming.NamingContextPackage.NotFound;
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/**
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* This class implements the persistent naming service, defined by
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* {@link NamingContext}. The 'persistent' means that the service remembers the
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* mappings, stored between restarts.
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*
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* @author Audrius Meskauskas, Lithuania (AudriusA@Bioinformatics.org)
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*/
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public class PersistentContext
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extends TransientContext
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{
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/**
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* Use serial version UID for interoperability.
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*/
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private static final long serialVersionUID = 2;
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/**
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* The folder, where the persistent context information is stored.
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*/
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File contextFolder;
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/**
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* The uinque context identifier.
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*/
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static long num = System.currentTimeMillis();
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/**
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* The naming service orb.
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*/
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ORB orb;
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/**
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* Create the persistent naming context that will store the files in the given
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* folder of the local file system. This method also connects object to the
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* passed ORB.
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*
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* @param an_orb the naming service ORB, used to obtain and produce the object
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* stringified references.
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* @param folder the folder, where the persistent information is stored.
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* @param reset if true, the previous naming data are discarded. If false
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* (normally expected), they are loaded from the persistent memory to
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* provide the persistence.
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*/
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public PersistentContext(ORB an_orb, File folder, boolean reset)
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{
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super(
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new PersistentContextMap(an_orb, new File(folder, "contexts.txt"), reset),
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new PersistentMap(an_orb, new File(folder, "objects.txt"), reset));
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contextFolder = folder;
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folder.mkdirs();
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orb = an_orb;
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orb.connect(this);
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}
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/**
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* Get the unique context number;
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*
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* @return the context number
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*/
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static synchronized String getNum()
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{
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return Long.toHexString(num++);
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}
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/**
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* Create new persistent context.
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*/
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public NamingContext new_context()
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{
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File ctxFolder = new File(contextFolder, "ctx_"+getNum());
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return new PersistentContext(orb, ctxFolder, true);
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}
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/**
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* Create a new context and give it a given name (bound it) in the current
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* context. The method benefits from passing the better readable context name.
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*
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* @param a_name the name being given to the new context.
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* @return the newly created context.
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* @throws AlreadyBound if the name is already in use.
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* @throws InvalidName if the name has zero length or otherwise invalid.
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*/
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public NamingContext bind_new_context(NameComponent[] a_name)
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throws NotFound, AlreadyBound, CannotProceed, InvalidName
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{
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if (named_contexts.containsKey(a_name[0])
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|| named_objects.containsKey(a_name[0]))
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throw new AlreadyBound();
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NameTransformer transformer = new NameTransformer();
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File ctxFolder = new File(contextFolder,
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transformer.toString(a_name).replace('/', '.')
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+ ".v" + getNum());
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NamingContext child = new PersistentContext(orb, ctxFolder, true);
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bind_context(a_name, child);
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return child;
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}
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}
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