WeightedBalancer


1   /**
2    * C-JDBC: Clustered JDBC.
3    * Copyright (C) 2002-2004 French National Institute For Research In Computer
4    * Science And Control (INRIA).
5    * Contact: c-jdbc@objectweb.org
6    * 
7    * This library is free software; you can redistribute it and/or modify it
8    * under the terms of the GNU Lesser General Public License as published by the
9    * Free Software Foundation; either version 2.1 of the License, or any later
10   * version.
11   * 
12   * This library is distributed in the hope that it will be useful, but WITHOUT
13   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14   * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
15   * for more details.
16   * 
17   * You should have received a copy of the GNU Lesser General Public License
18   * along with this library; if not, write to the Free Software Foundation,
19   * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20   *
21   * Initial developer(s): Nicolas Modrzyk
22   */
23  
24  package org.objectweb.cjdbc.controller.loadbalancer;
25  
26  import java.util.HashMap  ;
27  import java.util.Iterator  ;
28  
29  import org.objectweb.cjdbc.common.xml.DatabasesXmlTags;
30  
31  /**
32   * To return information, weighted load balancers share the same kind of
33   * information on backend configuration.
34   * 
35   * @author <a HREF="mailto:Nicolas.Modrzyk@inrialpes.fr">Nicolas Modrzyk </a>
36   * @version 1.0
37   */
38  public abstract class WeightedBalancer
39  {
40    /**
41     * get different xml tags of the weights in the system.
42     * 
43     * @param weights a list ((String)name,(Integer)weight) of weights
44     * @return xml formatted string of weighted backends
45     */
46    public static final String   getWeightedXml(HashMap   weights)
47    {
48      if (weights == null)
49        return "";
50      StringBuffer   info = new StringBuffer  ();
51      String   nametmp;
52      for (Iterator   iterator = weights.keySet().iterator(); iterator.hasNext();)
53      {
54        nametmp = (String  ) iterator.next();
55        info
56            .append("<" + DatabasesXmlTags.ELT_BackendWeight + " "
57                + DatabasesXmlTags.ATT_name + "=\"" + nametmp + "\" "
58                + DatabasesXmlTags.ATT_weight + "=\"" + weights.get(nametmp)
59                + "\"/>");
60      }
61      return info.toString();
62    }
63  
64    /**
65     * Convert raidb weighted balancers into xml because they share common views.
66     * 
67     * @param weights hashmap of (name,weight)
68     * @param xmltag the xml tag to use
69     * @return xml formatted string
70     */
71    public static final String   getRaidbXml(HashMap   weights, String   xmltag)
72    {
73      StringBuffer   info = new StringBuffer  ();
74      info.append("<" + xmltag + ">");
75      info.append(WeightedBalancer.getWeightedXml(weights));
76      info.append("</" + xmltag + ">");
77      return info.toString();
78    }
79  }
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