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Java > Open Source Codes > org > jboss > ejb > plugins > EntityInstancePool


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.ejb.plugins;
23
24 import org.jboss.ejb.EnterpriseContext;
25 import org.jboss.ejb.EntityEnterpriseContext;
26
27 /**
28  * An entity bean instance pool.
29  *
30  * @version <tt>$Revision: 37459 $</tt>
31  * @author <a HREF="mailto:rickard.oberg@telkel.com">Rickard Öberg</a>
32  * @author <a HREF="mailto:marc.fleury@telkel.com">Marc Fleury</a>
33  * @author <a HREF="mailto:andreas.schaefer@madplanet.com">Andreas Schaefer</a>
34  * @author <a HREF="mailto:sacha.labourey@cogito-info.ch">Sacha Labourey</a>
35  */
36 public class EntityInstancePool
37    extends AbstractInstancePool
38 {
39    /**
40     * Return an instance to the free pool. Reset state
41     *
42     * <p>Called in 3 cases:
43     * <ul>
44     * <li>Done with finder method
45     * <li>Removed
46     * <li>Passivated
47     * </ul>
48     *
49     * @param ctx
50     */
51    public void free(EnterpriseContext ctx)
52    {
53        // If transaction still present don't do anything (let the instance be GC)
54 if (ctx.getTransaction() != null)
55        {
56           if( log.isTraceEnabled() )
57              log.trace("Can Not FREE Entity Context because a Transaction exists.");
58           return ;
59        }
60
61        super.free(ctx);
62    }
63
64    protected EnterpriseContext create(Object JavaDoc instance)
65       throws Exception JavaDoc
66    {
67       return new EntityEnterpriseContext(instance, getContainer());
68    }
69 }
70
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