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Java > Open Source Codes > org > apache > excalibur > instrument > manager > http > XMLSampleLeaseHandler


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
14  * implied.
15  *
16  * See the License for the specific language governing permissions and
17  * limitations under the License.
18  */
19
20 package org.apache.excalibur.instrument.manager.http;
21
22 import java.io.FileNotFoundException JavaDoc;
23 import java.io.IOException JavaDoc;
24 import java.io.PrintWriter JavaDoc;
25 import java.util.Map JavaDoc;
26
27 import org.apache.excalibur.instrument.manager.DefaultInstrumentManager;
28 import org.apache.excalibur.instrument.manager.InstrumentSampleDescriptor;
29 import org.apache.excalibur.instrument.manager.NoSuchInstrumentSampleException;
30
31 /**
32  *
33  * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
34  * @version CVS $Revision: 1.6 $ $Date: 2004/03/06 14:01:28 $
35  * @since 4.1
36  */
37 public class XMLSampleLeaseHandler
38     extends AbstractXMLHandler
39 {
40     /*---------------------------------------------------------------
41      * Constructors
42      *-------------------------------------------------------------*/
43     /**
44      * Creates a new XMLSampleLeaseHandler.
45      *
46      * @param manager Reference to the DefaultInstrumentManager.
47      * @param connector The InstrumentManagerHTTPConnector.
48      */
49     public XMLSampleLeaseHandler( DefaultInstrumentManager manager,
50                                   InstrumentManagerHTTPConnector connector )
51     {
52         super( "/sample-lease.xml", manager, connector );
53     }
54     
55     /*---------------------------------------------------------------
56      * AbstractHTTPURLHandler Methods
57      *-------------------------------------------------------------*/
58     /**
59      * Handles the specified request.
60      *
61      * @param The full path being handled.
62      * @param parameters A Map of the parameters in the request.
63      * @param os The PrintWriter to write the result to.
64      */
65     public void doGet( String JavaDoc path, Map JavaDoc parameters, PrintWriter JavaDoc out )
66         throws IOException JavaDoc
67     {
68         String JavaDoc name = getParameter( parameters, "name" );
69         long lease = getLongParameter( parameters, "lease" );
70         boolean packed = getBooleanParameter( parameters, "packed", false );
71         
72         InstrumentSampleDescriptor desc;
73         try
74         {
75             desc = getInstrumentManager().locateInstrumentSampleDescriptor( name );
76         }
77         catch ( NoSuchInstrumentSampleException e )
78         {
79             throw new FileNotFoundException JavaDoc(
80                 "The specified instrument does not exist: " + name );
81         }
82         
83         // The instrument manager will do its own tests of the lease, but the
84 // restrictions on this connector may be stronger so they must be tested
85 // here as well.
86 lease = Math.max( 1, Math.min( lease, getConnector().getMaxLeasedSampleLease() ) );
87         
88         if ( getInstrumentManager().getLeaseSampleCount() >= getConnector().getMaxLeasedSamples() )
89         {
90             lease = 1;
91         }
92         
93         // Renew the lease
94 desc.extendLease( lease );
95         
96         out.println( InstrumentManagerHTTPConnector.XML_BANNER );
97         outputSample( out, desc, "", packed );
98     }
99             
100     /*---------------------------------------------------------------
101      * Methods
102      *-------------------------------------------------------------*/
103 }
104
105
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