KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > jboss > resource > adapter > jdbc > vendor > OracleValidConnectionChecker


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.resource.adapter.jdbc.vendor;
23
24 import java.io.Serializable JavaDoc;
25 import java.lang.reflect.Method JavaDoc;
26 import java.sql.Connection JavaDoc;
27 import java.sql.SQLException JavaDoc;
28
29 import org.jboss.logging.Logger;
30 import org.jboss.resource.adapter.jdbc.ValidConnectionChecker;
31 import org.jboss.util.NestedRuntimeException;
32
33 /**
34  * Implements check valid connection sql
35  *
36  * @author <a HREF="mailto:adrian@jboss.org">Adrian Brock</a>
37  * @version $Revision: 37459 $
38  */
39 public class OracleValidConnectionChecker
40    implements ValidConnectionChecker, Serializable JavaDoc
41 {
42    private static final long serialVersionUID = -2227528634302168877L;
43
44    private static final Logger log = Logger.getLogger(OracleValidConnectionChecker.class);
45
46    private Method JavaDoc ping;
47
48    // The timeout (apparently the timeout is ignored?)
49 private static Object JavaDoc[] params = new Object JavaDoc[] { new Integer JavaDoc(5000) };
50
51    public OracleValidConnectionChecker()
52    {
53       try
54       {
55          Class JavaDoc oracleConnection = Thread.currentThread().getContextClassLoader().loadClass("oracle.jdbc.driver.OracleConnection");
56          ping = oracleConnection.getMethod("pingDatabase", new Class JavaDoc[] { Integer.TYPE });
57       }
58       catch (Exception JavaDoc e)
59       {
60          throw new NestedRuntimeException("Unable to resolve pingDatabase method:", e);
61       }
62    }
63
64    public SQLException JavaDoc isValidConnection(Connection JavaDoc c)
65    {
66       try
67       {
68          Integer JavaDoc status = (Integer JavaDoc) ping.invoke(c, params);
69
70          // Error
71 if (status.intValue() < 0)
72             return new SQLException JavaDoc("pingDatabase failed status=" + status);
73       }
74       catch (Exception JavaDoc e)
75       {
76          // What do we do here? Assume it is a misconfiguration
77 log.warn("Unexpected error in pingDatabase", e);
78       }
79
80       // OK
81 return null;
82    }
83 }
84
Popular Tags