1 /* HostnameQueueAssignmentPolicy
2 *
3 * $Id: HostnameQueueAssignmentPolicy.java 3838 2005-09-21 23:00:47Z gojomo $
4 *
5 * Created on Oct 5, 2004
6 *
7 * Copyright (C) 2004 Internet Archive.
8 *
9 * This file is part of the Heritrix web crawler (crawler.archive.org).
10 *
11 * Heritrix is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser Public License as published by
13 * the Free Software Foundation; either version 2.1 of the License, or
14 * any later version.
15 *
16 * Heritrix is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser Public License
22 * along with Heritrix; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25 package org.archive.crawler.frontier;
26
27 import java.util.logging.Level;
28 import java.util.logging.Logger;
29
30 import org.apache.commons.httpclient.URIException;
31 import org.archive.crawler.datamodel.CandidateURI;
32 import org.archive.crawler.framework.CrawlController;
33 import org.archive.net.UURI;
34 import org.archive.net.UURIFactory;
35
36 /***
37 * QueueAssignmentPolicy based on the hostname:port evident in the given
38 * CrawlURI.
39 *
40 * @author gojomo
41 */
42 public class HostnameQueueAssignmentPolicy extends QueueAssignmentPolicy {
43 private static final Logger logger = Logger
44 .getLogger(HostnameQueueAssignmentPolicy.class.getName());
45 /***
46 * When neat host-based class-key fails us
47 */
48 private static String DEFAULT_CLASS_KEY = "default...";
49
50 private static final String DNS = "dns";
51
52 public String getClassKey(CrawlController controller, CandidateURI cauri) {
53 String scheme = cauri.getUURI().getScheme();
54 String candidate = null;
55 try {
56 if (scheme.equals(DNS)){
57 if (cauri.getVia() != null) {
58 // Special handling for DNS: treat as being
59 // of the same class as the triggering URI.
60 // When a URI includes a port, this ensures
61 // the DNS lookup goes atop the host:port
62 // queue that triggered it, rather than
63 // some other host queue
64 UURI viaUuri = UURIFactory.getInstance(cauri.flattenVia());
65 candidate = viaUuri.getAuthorityMinusUserinfo();
66 // adopt scheme of triggering URI
67 scheme = viaUuri.getScheme();
68 } else {
69 candidate= cauri.getUURI().getReferencedHost();
70 }
71 } else {
72 candidate = cauri.getUURI().getAuthorityMinusUserinfo();
73 }
74
75 if(candidate == null || candidate.length() == 0) {
76 candidate = DEFAULT_CLASS_KEY;
77 }
78 } catch (URIException e) {
79 logger.log(Level.INFO,
80 "unable to extract class key; using default", e);
81 candidate = DEFAULT_CLASS_KEY;
82 }
83 if (scheme != null && scheme.equals(UURIFactory.HTTPS)) {
84 // If https and no port specified, add default https port to
85 // distinguish https from http server without a port.
86 if (!candidate.matches(".+:[0-9]+")) {
87 candidate += UURIFactory.HTTPS_PORT;
88 }
89 }
90 // Ensure classKeys are safe as filenames on NTFS
91 return candidate.replace(':','#');
92 }
93
94 }