IdentityTokenResolvable


1   /*
2    * Distributed as part of c3p0 v.0.9.1
3    *
4    * Copyright (C) 2005 Machinery For Change, Inc.
5    *
6    * Author: Steve Waldman <swaldman@mchange.com>
7    *
8    * This library is free software; you can redistribute it and/or modify
9    * it under the terms of the GNU Lesser General Public License version 2.1, as 
10   * published by the Free Software Foundation.
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
15   * GNU Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public License
18   * along with this software; see the file LICENSE.  If not, write to the
19   * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20   * Boston, MA 02111-1307, USA.
21   */
22  
23  
24  package com.mchange.v2.c3p0.impl;
25  
26  import com.mchange.v2.c3p0.*;
27  import java.io.ObjectStreamException  ;
28  
29  /**
30   * This is a convenient base class for all classes
31   * that wish to establish an initial identity which
32   * will be the basis of a one-per vm identity: i.e.
33   * in any vm there should only ever be a single object
34   * with a given identity token (except transiently during
35   * canonicalization)
36   *
37   * It would be convenient to put the getter/setter methods
38   * for the identity token here, but unfortunately we have no
39   * way of setting up the for Referenceability in multiple
40   * levels of a class hierarchy. So we leave the getters/setters,
41   * and variable initialization to code-generators.
42   */
43  public abstract class IdentityTokenResolvable extends AbstractIdentityTokenized
44  {
45      public static Object   doResolve(IdentityTokenized itd)
46      { return C3P0Registry.reregister( itd ); }
47  
48      protected Object   readResolve() throws ObjectStreamException  
49      { 
50      //System.err.println("READ RESOLVE!!!!");
51      Object   out = doResolve( this ); 
52      verifyResolve( out );
53      //System.err.println("ORIG: " + this);
54      //System.err.println("RSLV: " + out);
55      return out;
56      }
57  
58      protected void verifyResolve( Object   o ) throws ObjectStreamException  
59      {}
60  }
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