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1   /*
2    * $Id: JdbcMessageRequester.java 19191 2010-08-25 21:05:23Z tcarlson $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  
11  package org.mule.transport.jdbc;
12  
13  import org.mule.api.MuleEvent;
14  import org.mule.api.MuleMessage;
15  import org.mule.api.endpoint.InboundEndpoint;
16  import org.mule.transport.AbstractMessageRequester;
17  import org.mule.transport.jdbc.sqlstrategy.SqlStatementStrategy;
18  
19  
20  public class JdbcMessageRequester extends AbstractMessageRequester
21  {
22  
23      private JdbcConnector connector;
24  
25      public JdbcMessageRequester(InboundEndpoint endpoint)
26      {
27          super(endpoint);
28          this.connector = (JdbcConnector) endpoint.getConnector();
29      }
30  
31      @Override
32      protected void doDispose()
33      {
34          // template method
35      }
36  
37      /**
38       * Make a specific request to the underlying transport
39       *
40       * @param timeout the maximum time the operation should block before returning.
41       *            The call should return immediately if there is data available. If
42       *            no data becomes available before the timeout elapses, null will be
43       *            returned
44       * @return the result of the request wrapped in a MuleMessage object. Null will be
45       *         returned if no data was available
46       * @throws Exception if the call to the underlying protocol causes an exception
47       */
48      protected MuleMessage doRequest(long timeout) throws Exception
49      {
50          return doRequest(timeout, null);
51      }
52  
53      /**
54       * Make a specific request to the underlying transport
55       * Special case: The event is need when doReceive was called from doSend
56       * @param timeout only for compatibility with doRequest(long timeout)
57       * @param event There is a need to get params from message
58       * @return the result of the request wrapped in a MuleMessage object. Null will be
59       *         returned if no data was available
60       * @throws Exception if the call to the underlying protocol causes an exception
61       */
62      protected MuleMessage doRequest(long timeout, MuleEvent event) throws Exception
63      {
64          SqlStatementStrategy strategy = connector.getSqlStatementStrategyFactory().create("select", null);
65          return strategy.executeStatement(connector, endpoint, event, timeout);        
66      }
67  
68  
69      @Override
70      protected void doConnect() throws Exception
71      {
72          // template method
73      }
74  
75      @Override
76      protected void doDisconnect() throws Exception
77      {
78          // template method
79      }
80  
81  }