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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *  
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *  
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License. 
18   *  
19   */
20  package org.apache.directory.server.dns.service;
21  
22  
23  import java.util.List;
24  
25  import org.apache.directory.server.dns.messages.ResourceRecord;
26  import org.apache.directory.server.dns.store.RecordStore;
27  import org.apache.mina.common.IoSession;
28  import org.apache.mina.handler.chain.IoHandlerCommand;
29  import org.slf4j.Logger;
30  import org.slf4j.LoggerFactory;
31  
32  
33  /**
34   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
35   * @version $Rev: 547132 $, $Date: 2007-06-14 07:43:03 +0200 (Do, 14 Jun 2007) $
36   */
37  public class MonitorContext implements IoHandlerCommand
38  {
39      /** the log for this class */
40      private static final Logger log = LoggerFactory.getLogger( MonitorContext.class );
41  
42      private String contextKey = "context";
43  
44  
45      public void execute( NextCommand next, IoSession session, Object message ) throws Exception
46      {
47          if ( log.isDebugEnabled() )
48          {
49              try
50              {
51                  DnsContext dnsContext = ( DnsContext ) session.getAttribute( getContextKey() );
52                  RecordStore store = dnsContext.getStore();
53                  List<ResourceRecord> records = dnsContext.getResourceRecords();
54  
55                  StringBuffer sb = new StringBuffer();
56                  sb.append( "Monitoring context:" );
57                  sb.append( "\n\t" + "store:                     " + store );
58                  sb.append( "\n\t" + "records:                   " + records );
59  
60                  log.debug( sb.toString() );
61              }
62              catch ( Exception e )
63              {
64                  // This is a monitor.  No exceptions should bubble up.
65                  log.error( "Error in context monitor", e );
66              }
67          }
68  
69          next.execute( session, message );
70      }
71  
72  
73      protected String getContextKey()
74      {
75          return ( this.contextKey );
76      }
77  }