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Java > Open Source Codes > org > jboss > kernel > plugins > registry > basic > BasicKernelRegistryFactory


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.kernel.plugins.registry.basic;
23
24 import java.util.Map JavaDoc;
25
26 import org.jboss.kernel.spi.registry.KernelRegistryEntry;
27 import org.jboss.kernel.spi.registry.KernelRegistryEntryAlreadyRegisteredException;
28 import org.jboss.kernel.spi.registry.KernelRegistryEntryNotFoundException;
29 import org.jboss.kernel.spi.registry.KernelRegistryPlugin;
30 import org.jboss.logging.Logger;
31 import org.jboss.util.collection.CollectionsFactory;
32
33 /**
34  * Basic Kernel registry factory.
35  *
36  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
37  * @version $Revision: 57307 $
38  */
39 public class BasicKernelRegistryFactory implements KernelRegistryPlugin
40 {
41    /** The log */
42    private static final Logger log = Logger.getLogger(BasicKernelRegistryFactory.class);
43
44    /** The registred entries */
45    protected Map JavaDoc<Object JavaDoc, KernelRegistryEntry> entries = CollectionsFactory.createConcurrentReaderMap();
46
47    /**
48     * Create a new basic registry factory
49     *
50     * @throws Exception for any error
51     */
52    public BasicKernelRegistryFactory() throws Exception JavaDoc
53    {
54    }
55
56    public void registerEntry(Object JavaDoc name, KernelRegistryEntry entry)
57    {
58       if (name == null)
59          throw new IllegalArgumentException JavaDoc("Null name");
60       if (entry == null)
61          throw new IllegalArgumentException JavaDoc("Null entry");
62
63       boolean trace = log.isTraceEnabled();
64
65       synchronized (entries)
66       {
67          if (entries.containsKey(name))
68             throw new KernelRegistryEntryAlreadyRegisteredException("Already registered: " + name);
69          entries.put(name, entry);
70          entry.setName(name);
71       }
72
73       if (trace)
74          log.trace("Registered object: '" + entry + "' with name '" + name + "'");
75    }
76
77    public KernelRegistryEntry unregisterEntry(Object JavaDoc name)
78    {
79       if (name == null)
80          throw new IllegalArgumentException JavaDoc("Null name");
81
82       boolean trace = log.isTraceEnabled();
83
84       KernelRegistryEntry entry;
85
86       synchronized (entries)
87       {
88          entry = entries.remove(name);
89          if (entry == null)
90             throw new KernelRegistryEntryNotFoundException("Not found: " + name);
91       }
92
93       if (trace)
94          log.trace("Unregistered name: '" + name + "'");
95
96       return entry;
97    }
98
99    public KernelRegistryEntry getEntry(Object JavaDoc name)
100    {
101       if (name == null)
102          throw new IllegalArgumentException JavaDoc("Null name");
103
104       return entries.get(name);
105    }
106 }
107
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