Annotation of java/classes/org/w3c/www/protocol/http/HttpManager.java, revision 1.95
1.1 abaird 1: // HttpManager.java
1.95 ! ylafon 2: // $Id: HttpManager.java,v 1.94 2012/06/16 15:48:52 ylafon Exp $
1.1 abaird 3: // (c) COPYRIGHT MIT and INRIA, 1996.
4: // Please first read the full copyright statement in file COPYRIGHT.html
5:
1.94 ylafon 6: package org.w3c.www.protocol.http;
1.1 abaird 7:
1.65 ylafon 8: import java.util.Enumeration;
9: import java.util.Hashtable;
10: import java.util.Properties;
11:
12: import java.net.URL;
13:
14: import java.io.InputStream;
15: import java.io.PrintStream;
16:
17: import org.w3c.www.mime.MimeHeaderHolder;
18: import org.w3c.www.mime.MimeParser;
19: import org.w3c.www.mime.MimeParserFactory;
20:
21: import org.w3c.util.LRUList;
22: import org.w3c.util.ObservableProperties;
23: import org.w3c.util.PropertyMonitoring;
24: import org.w3c.util.SyncLRUList;
1.1 abaird 25:
1.25 abaird 26: class ManagerDescription {
27: HttpManager manager = null;
1.94 ylafon 28: Properties properties = null;
1.25 abaird 29:
30: final HttpManager getManager() {
1.94 ylafon 31: return manager;
1.25 abaird 32: }
33:
34: final boolean sameProperties(Properties props) {
1.94 ylafon 35: if (props.size() != properties.size())
36: return false;
37: Enumeration e = props.propertyNames();
38: while (e.hasMoreElements()) {
39: String name = (String) e.nextElement();
40: String prop = properties.getProperty(name);
41: if ((prop == null) || (!prop.equals(props.getProperty(name))))
42: return false;
43: }
44: return true;
1.25 abaird 45: }
46:
47: ManagerDescription(HttpManager manager, Properties props) {
1.94 ylafon 48: this.manager = manager;
49: this.properties = (Properties) props.clone();
1.25 abaird 50: }
51: }
52:
1.1 abaird 53: class ReplyFactory implements MimeParserFactory {
1.65 ylafon 54:
1.1 abaird 55: public MimeHeaderHolder createHeaderHolder(MimeParser parser) {
1.94 ylafon 56: return new Reply(parser);
1.1 abaird 57: }
58:
59: }
60:
61: /**
62: * The client side HTTP request manager.
63: * This class is the user interface (along with the other public classes of
1.94 ylafon 64: * this package) for the W3C client side library implementing HTTP.
1.89 ylafon 65: * A typical request is launched though the following sequence:
1.1 abaird 66: * <pre>
67: * HttpManager manager = HttpManager.getManager() ;
1.36 ylafon 68: * Request request = manager.createRequest() ;
1.1 abaird 69: * request.setMethod(HTTP.GET) ;
70: * request.setURL(new URL("http://www.w3.org/pub/WWW/"));
71: * Reply reply = manager.runRequest(request) ;
72: * // Get the reply input stream that contains the actual data:
73: * InputStream in = reply.getInputStream() ;
74: * ...
75: * </pre>
76: */
77:
1.13 abaird 78: public class HttpManager implements PropertyMonitoring {
1.45 ylafon 79:
80: private static final boolean debug = false;
81:
1.94 ylafon 82: private static final
1.38 bmahe 83: String DEFAULT_SERVER_CLASS = "org.w3c.www.protocol.http.HttpBasicServer";
1.17 abaird 84:
85: /**
86: * The name of the property indicating the class of HttpServer to use.
87: */
88: public static final
1.38 bmahe 89: String SERVER_CLASS_P = "org.w3c.www.protocol.http.server";
1.17 abaird 90:
1.2 abaird 91: /**
92: * The name of the property containing the ProprequestFilter to launch.
93: */
1.94 ylafon 94: public static final
1.38 bmahe 95: String FILTERS_PROP_P = "org.w3c.www.protocol.http.filters";
1.5 abaird 96: /**
1.43 ylafon 97: * The maximum number of simultaneous connectionlrus.
1.11 abaird 98: */
99: public static final
1.38 bmahe 100: String CONN_MAX_P = "org.w3c.www.protocol.http.connections.max";
1.11 abaird 101: /**
1.35 ylafon 102: * The SO_TIMEOUT of the client socket.
103: */
104: public static final
1.38 bmahe 105: String TIMEOUT_P = "org.w3c.www.protocol.http.connections.timeout";
1.35 ylafon 106: /**
1.82 ylafon 107: * The connection timeout of the client socket.
108: */
109: public static final
1.94 ylafon 110: String CONN_TIMEOUT_P = "org.w3c.www.protocol.http.connections.connTimeout";
1.82 ylafon 111: /**
1.5 abaird 112: * Header properties - The allowed drift for getting cached resources.
113: */
1.94 ylafon 114: public static final
1.38 bmahe 115: String MAX_STALE_P = "org.w3c.www.protocol.http.cacheControl.maxStale";
1.5 abaird 116: /**
117: * Header properties - The minium freshness required on cached resources.
118: */
119: public static final
1.38 bmahe 120: String MIN_FRESH_P = "org.w3c.www.protocol.http.cacheControl.minFresh";
1.5 abaird 121: /**
122: * Header properties - Set the only if cached flag on requests.
123: */
1.94 ylafon 124: public static final
125: String ONLY_IF_CACHED_P =
126: "org.w3c.www.protocol.http.cacheControl.onlyIfCached";
1.5 abaird 127: /**
128: * Header properties - Set the user agent.
129: */
1.94 ylafon 130: public static final
1.38 bmahe 131: String USER_AGENT_P = "org.w3c.www.protocol.http.userAgent";
1.5 abaird 132: /**
133: * Header properties - Set the accept header.
134: */
1.94 ylafon 135: public static final
1.38 bmahe 136: String ACCEPT_P = "org.w3c.www.protocol.http.accept";
1.5 abaird 137: /**
138: * Header properties - Set the accept language.
139: */
1.94 ylafon 140: public static final
1.38 bmahe 141: String ACCEPT_LANGUAGE_P = "org.w3c.www.protocol.http.acceptLanguage";
1.5 abaird 142: /**
143: * Header properties - Set the accept encodings.
144: */
1.94 ylafon 145: public static final
1.38 bmahe 146: String ACCEPT_ENCODING_P = "org.w3c.www.protocol.http.acceptEncoding";
1.5 abaird 147: /**
1.62 ylafon 148: * Header properties - are we parsing answers in a lenient way?
149: */
1.94 ylafon 150: public static final
1.62 ylafon 151: String LENIENT_P = "org.w3c.www.protocol.http.lenient";
152: /**
1.79 ylafon 153: * Header properties - should we reuse a connection for POST?
154: */
1.94 ylafon 155: public static final
1.79 ylafon 156: String KEEPBODY_P = "org.w3c.www.protocol.http.keepbody";
157: /**
1.5 abaird 158: * Header properties - Should we use a proxy ?
159: */
160: public static final
1.12 abaird 161: String PROXY_SET_P = "proxySet";
1.5 abaird 162: /**
163: * Header properties - What is the proxy host name.
164: */
165: public static final
1.12 abaird 166: String PROXY_HOST_P = "proxyHost";
1.5 abaird 167: /**
168: * Header properties - What is the proxy port number.
169: */
170: public static final
1.12 abaird 171: String PROXY_PORT_P = "proxyPort";
1.2 abaird 172:
1.7 abaird 173: /**
174: * The default value for the <code>Accept</code> header.
175: */
176: public static final
177: String DEFAULT_ACCEPT = "*/*";
178: /**
179: * The default value for the <code>User-Agent</code> header.
180: */
181: public static final
1.93 ylafon 182: String DEFAULT_USER_AGENT = "Jigsaw/2.3.0-beta2";
1.7 abaird 183:
1.24 abaird 184: /**
185: * This array keeps track of all the created managers.
186: * A new manager (kind of HTTP client side context) is created for each
187: * diffferent set of properties.
188: */
1.25 abaird 189: private static ManagerDescription managers[] = new ManagerDescription[4];
1.65 ylafon 190:
1.1 abaird 191: /**
1.17 abaird 192: * The class to instantiate to create new HttpServer instances.
193: */
194: protected Class serverclass = null;
195: /**
1.13 abaird 196: * The properties we initialized from.
197: */
198: ObservableProperties props = null;
199: /**
1.1 abaird 200: * The server this manager knows about, indexed by FQDN of target servers.
201: */
202: protected Hashtable servers = null;
203: /**
204: * The template request (the request we will clone to create new requests)
205: */
1.94 ylafon 206: protected Request template = null;
1.4 abaird 207: /**
1.9 abaird 208: * The LRU list of connections.
1.4 abaird 209: */
1.9 abaird 210: protected LRUList connectionsLru = null;
1.1 abaird 211: /**
212: * The filter engine attached to this manager.
213: */
214: FilterEngine filteng = null;
215:
1.35 ylafon 216: protected int timeout = 300000;
1.85 ylafon 217: protected int conn_timeout = 3000;
1.9 abaird 218: protected int conn_count = 0;
219: protected int conn_max = 5;
1.62 ylafon 220: protected boolean lenient = true;
1.79 ylafon 221: protected boolean keepbody = false;
1.9 abaird 222:
1.83 ylafon 223: protected Hashtable _tmp_servers = null; // synced during creation
224:
1.1 abaird 225: /**
1.13 abaird 226: * Update the proxy configuration to match current properties setting.
1.94 ylafon 227: *
1.13 abaird 228: * @return A boolean, <strong>true</strong> if change was done,
1.94 ylafon 229: * <strong>false</strong> otherwise.
1.13 abaird 230: */
231:
232: protected boolean updateProxy() {
1.94 ylafon 233: boolean set = props.getBoolean(PROXY_SET_P, false);
234: if (set) {
235: // Wow using a proxy now !
236: String host = props.getString(PROXY_HOST_P, null);
237: int port = props.getInteger(PROXY_PORT_P, -1);
238: URL proxy = null;
239: try {
240: proxy = new URL("http", host, port, "/");
241: } catch (Exception ex) {
242: return false;
243: }
244: // Now if a proxy...
245: if ((proxy != null) && (proxy.getHost() != null))
246: template.setProxy(proxy);
247: } else {
248: template.setProxy(null);
249: }
250: return true;
1.13 abaird 251: }
252:
253: /**
1.24 abaird 254: * Get this manager properties.
1.94 ylafon 255: *
1.24 abaird 256: * @return An ObservableProperties instance.
257: */
258:
259: public final ObservableProperties getProperties() {
1.94 ylafon 260: return props;
1.24 abaird 261: }
262:
263: /**
1.13 abaird 264: * PropertyMonitoring implementation - Update properties on the fly !
1.94 ylafon 265: *
1.13 abaird 266: * @param name The name of the property that has changed.
267: * @return A boolean, <strong>true</strong> if change is accepted,
1.94 ylafon 268: * <strong>false</strong> otherwise.
1.13 abaird 269: */
270:
271: public boolean propertyChanged(String name) {
1.94 ylafon 272: Request tpl = template;
273: if (name.equals(FILTERS_PROP_P)) {
274: // FIXME
275: return true;
276: // return false;
277: } else if (name.equals(TIMEOUT_P)) {
278: setTimeout(props.getInteger(TIMEOUT_P, timeout));
279: return true;
280: } else if (name.equals(CONN_TIMEOUT_P)) {
281: setConnTimeout(props.getInteger(CONN_TIMEOUT_P, conn_timeout));
282: return true;
283: } else if (name.equals(CONN_MAX_P)) {
284: setMaxConnections(props.getInteger(CONN_MAX_P, conn_max));
285: return true;
286: } else if (name.equals(MAX_STALE_P)) {
287: int ival = props.getInteger(MAX_STALE_P, -1);
288: if (ival >= 0)
289: tpl.setMaxStale(ival);
290: return true;
291: } else if (name.equals(MIN_FRESH_P)) {
292: int ival = props.getInteger(MIN_FRESH_P, -1);
293: if (ival >= 0)
294: tpl.setMinFresh(ival);
295: return true;
296: } else if (name.equals(LENIENT_P)) {
297: lenient = props.getBoolean(LENIENT_P, lenient);
298: return true;
299: } else if (name.equals(KEEPBODY_P)) {
300: keepbody = props.getBoolean(KEEPBODY_P, keepbody);
301: return true;
302: }
303: if (name.equals(ONLY_IF_CACHED_P)) {
304: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
305: return true;
306: } else if (name.equals(USER_AGENT_P)) {
307: tpl.setValue("user-agent"
308: , props.getString(USER_AGENT_P
309: , DEFAULT_USER_AGENT));
310: return true;
311: } else if (name.equals(ACCEPT_P)) {
312: tpl.setValue("accept"
313: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
314: return true;
315: } else if (name.equals(ACCEPT_LANGUAGE_P)) {
316: String sval = props.getString(ACCEPT_LANGUAGE_P, null);
317: if (sval != null)
318: tpl.setValue("accept-language", sval);
319: return true;
320: } else if (name.equals(ACCEPT_ENCODING_P)) {
321: String sval = props.getString(ACCEPT_ENCODING_P, null);
322: if (sval != null)
323: tpl.setValue("accept-encoding", sval);
324: return true;
325: } else if (name.equals(PROXY_SET_P)
326: || name.equals(PROXY_HOST_P)
327: || name.equals(PROXY_PORT_P)) {
328: return updateProxy();
329: } else {
330: return true;
331: }
1.13 abaird 332: }
333:
334: /**
1.4 abaird 335: * Allow the manager to interact with the user if needed.
336: * This will, for example, allow prompting for paswords, etc.
1.94 ylafon 337: *
1.4 abaird 338: * @param onoff Turn interaction on or off.
339: */
340:
341: public void setAllowUserInteraction(boolean onoff) {
1.94 ylafon 342: template.setAllowUserInteraction(onoff);
1.4 abaird 343: }
344:
1.94 ylafon 345: protected static synchronized HttpManager getManager(Class managerclass, Properties p) {
346: // Does such a manager exists already ?
347: for (ManagerDescription descr : managers) {
348: if (descr != null && descr.sameProperties(p)) {
349: return descr.getManager();
350: }
351: }
352: // Get the props we will initialize from:
353: ObservableProperties props = null;
354: if (p instanceof ObservableProperties)
355: props = (ObservableProperties) p;
356: else
357: props = new ObservableProperties(p);
358: // Create a new manager for this set of properties:
359: HttpManager manager = null;
360: try {
361: Object o = managerclass.newInstance();
362: if (o instanceof HttpManager) {
363: manager = (HttpManager) o;
364: } else { // default value
365: manager = new HttpManager();
366: }
367: } catch (Exception ex) {
368: ex.printStackTrace();
369: manager = new HttpManager();
370: }
371: manager.props = props;
372: // Initialize this new manager filters:
373: String filters[] = props.getStringArray(FILTERS_PROP_P, null);
374: if (filters != null) {
375: for (String filter : filters) {
376: try {
377: Class c = Class.forName(filter);
378: PropRequestFilter f = null;
379: f = (PropRequestFilter) c.newInstance();
380: f.initialize(manager);
381: } catch (PropRequestFilterException ex) {
382: System.out.println("Couldn't initialize filter \""
383: + filter
384: + "\" init failed: "
385: + ex.getMessage());
386: } catch (Exception ex) {
387: System.err.println("Error initializing prop filters:");
388: System.err.println("Coulnd't initialize ["
389: + filter
390: + "]: " + ex.getMessage());
391: ex.printStackTrace();
392: System.exit(1);
393: }
394: }
395: }
396: // The factory to create MIME reply holders:
397: manager.factory = manager.getReplyFactory();
398: // The class to create HttpServer instances from
399: String c = props.getString(SERVER_CLASS_P, DEFAULT_SERVER_CLASS);
400: try {
401: manager.serverclass = Class.forName(c);
402: } catch (Exception ex) {
403: System.err.println("Unable to initialize HttpManager: ");
404: System.err.println("Class \"" + c + "\" not found, from property "
405: + SERVER_CLASS_P);
406: ex.printStackTrace();
407: System.exit(1);
408: }
409: // Setup the template request:
410: Request tpl = manager.template;
411: // Set some default headers value (from props)
412: // Check for a proxy ?
413: manager.updateProxy();
414: // CacheControl, only-if-cached
415: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
416: // CacheControl, maxstale
417: int ival = props.getInteger(MAX_STALE_P, -1);
418: if (ival >= 0)
419: tpl.setMaxStale(ival);
420: // CacheControl, minfresh:
421: ival = props.getInteger(MIN_FRESH_P, -1);
422: if (ival >= 0)
423: tpl.setMinFresh(ival);
424: // general, lenient
425: manager.lenient = props.getBoolean(LENIENT_P, true);
426: manager.keepbody = props.getBoolean(KEEPBODY_P, false);
427: // General, User agent
428: String sval;
429: tpl.setValue("user-agent"
430: , props.getString(USER_AGENT_P
431: , DEFAULT_USER_AGENT));
432: // General, Accept
433: tpl.setValue("accept"
434: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
435: // General, Accept-Language
436: sval = props.getString(ACCEPT_LANGUAGE_P, null);
437: if (sval != null) {
438: if (sval.trim().length() > 0) {
439: tpl.setValue("accept-language", sval);
440: }
441: }
442: // General, Accept-Encoding
443: sval = props.getString(ACCEPT_ENCODING_P, null);
444: if (sval != null) {
445: if (sval.trim().length() > 0) {
446: tpl.setValue("accept-encoding", sval);
447: }
448: }
449: // Maximum number of allowed connections:
450: manager.conn_max = props.getInteger(CONN_MAX_P, 5);
451: // timeout value
452: manager.timeout = props.getInteger(TIMEOUT_P, manager.timeout);
453: // connection timeout
454: manager.conn_timeout = props.getInteger(CONN_TIMEOUT_P,
455: manager.conn_timeout);
456: // Register ourself as a property observer:
457: props.registerObserver(manager);
458: // Register that manager in our knwon managers:
459: for (int i = 0; i < managers.length; i++) {
460: if (managers[i] == null) {
461: managers[i] = new ManagerDescription(manager, p);
462: return manager;
463: }
464: }
465: ManagerDescription nm[] = new ManagerDescription[managers.length << 1];
466: System.arraycopy(managers, 0, nm, 0, managers.length);
467: nm[managers.length] = new ManagerDescription(manager, p);
468: managers = nm;
469: return manager;
1.1 abaird 470: }
1.94 ylafon 471:
1.66 bmahe 472:
473: /**
474: * Get an instance of the HTTP manager.
475: * This method returns an actual instance of the HTTP manager. It may
476: * return different managers, if it decides to distribute the load on
477: * different managers (avoid the HttpManager being a bottleneck).
1.94 ylafon 478: *
1.66 bmahe 479: * @return An application wide instance of the HTTP manager.
480: */
481:
482: public static synchronized HttpManager getManager(Properties p) {
1.94 ylafon 483: return getManager(HttpManager.class, p);
1.66 bmahe 484: }
1.1 abaird 485:
1.24 abaird 486: public static HttpManager getManager() {
1.94 ylafon 487: return getManager(System.getProperties());
1.24 abaird 488: }
1.1 abaird 489:
490: /**
1.32 abaird 491: * Get the String key for the server instance handling that request.
492: * This method takes care of any proxy setting (it will return the key
493: * to the proxy when required.)
1.94 ylafon 494: *
1.32 abaird 495: * @return A uniq identifier for the handling server, as a String.
496: */
497:
498: public final String getServerKey(Request request) {
1.94 ylafon 499: URL proxy = request.getProxy();
500: URL target = request.getURL();
501: String key = null;
502: if (proxy != null) {
503: return ((proxy.getPort() == 80)
504: ? proxy.getHost().toLowerCase()
505: : (proxy.getHost().toLowerCase() + ":" + proxy.getPort()));
506: } else {
507: return ((target.getPort() == 80)
508: ? target.getHost().toLowerCase()
509: : (target.getHost().toLowerCase() + ":" + target.getPort()));
510: }
1.32 abaird 511: }
512:
513: /**
1.1 abaird 514: * Get the appropriate server object for handling request to given target.
1.94 ylafon 515: *
516: * @param host The server's key, as returned by <code>getServerKey</code>.
517: * @param port The server's port
1.1 abaird 518: * @return An object complying to the HttpServer interface.
1.94 ylafon 519: * @throws HttpException If the given host name couldn't be resolved.
1.1 abaird 520: */
521:
1.76 ylafon 522: protected HttpServer lookupServer(String host, int port)
1.94 ylafon 523: throws HttpException {
524: int p = (port == -1) ? 80 : port;
525: String id = ((p == 80)
526: ? host.toLowerCase()
527: : (host.toLowerCase() + ":" + p));
528: // Check for an existing server:
529: HttpServer server = (HttpServer) servers.get(id);
530: if (server != null) {
531: return server;
532: }
533: // Create and register a new server:
534: synchronized (_tmp_servers) {
535: if (_tmp_servers.containsKey(id)) {
536: server = (HttpServer) _tmp_servers.get(id);
537: synchronized (server) {
538: while (server.state == null ||
539: server.state.state != HttpServerState.PREINIT) {
540: try {
541: wait(100);
542: } catch (InterruptedException ex) {
543: } catch (IllegalMonitorStateException ex) {
544: break;
545: }
546: }
547: }
548: if (server.state.state == HttpServerState.OK) {
549: return server;
550: } else if (server.state.ex != null) {
551: throw server.state.ex;
552: } else {
553: throw new RuntimeException("Unexpected error " +
554: "in lookupServer");
555: }
556: } else {
557: try {
558: server = (HttpServer) serverclass.newInstance();
559: } catch (Exception ex) {
560: String msg = ("Unable to create an instance of \""
561: + serverclass.getName()
562: + "\", invalid config, check the "
563: + SERVER_CLASS_P + " property.");
564: throw new HttpException(ex, msg);
565: }
566: }
567: }
568: try {
569: synchronized (server) {
570: server.initialize(this, new HttpServerState(server), host, p,
571: timeout, conn_timeout);
572: try {
573: notifyAll();
574: } catch (IllegalMonitorStateException imse) {
575: }
576: }
577: // FIXME for long running servers the growing hashtable is
578: // a potential leak. This is a hard way of taking care of that
1.83 ylafon 579: // if (servers.size() > conn_max) {
580: // closeAnyConnection();
581: // servers = new Hashtable(conn_max);
582: // }
1.94 ylafon 583: } finally {
584: synchronized (_tmp_servers) {
585: if (server.state.state == HttpServerState.OK) {
586: if (!servers.containsKey(id)) {
587: servers.put(id, server);
588: }
589: } else {
1.83 ylafon 590: // System.err.println("ERROR State is "+server.state.state
591: // +" for " + server);
1.94 ylafon 592: }
593: _tmp_servers.remove(id);
594: }
595: }
596: return server;
1.1 abaird 597: }
1.5 abaird 598:
1.1 abaird 599: /**
1.60 ylafon 600: * The given connection is about to be used.
601: * Update our list of available servers.
1.94 ylafon 602: *
1.60 ylafon 603: * @param conn The idle connection.
604: */
605:
1.83 ylafon 606: public synchronized void notifyUse(HttpConnection conn) {
1.94 ylafon 607: if (debug)
608: System.out.println(conn + "+++ connection used");
609: connectionsLru.remove(conn);
1.60 ylafon 610: }
611:
612: /**
1.9 abaird 613: * The given connection can be reused, but is now idle.
1.94 ylafon 614: *
1.9 abaird 615: * @param conn The connection that is now idle.
1.4 abaird 616: */
617:
1.60 ylafon 618: public synchronized void notifyIdle(HttpConnection conn) {
1.94 ylafon 619: if (debug)
620: System.out.println(conn + "+++ connection idle");
621: connectionsLru.toHead(conn);
622: notifyAll();
1.4 abaird 623: }
624:
625: /**
1.9 abaird 626: * The given connection has just been created.
1.94 ylafon 627: *
1.9 abaird 628: * @param conn The newly created connection.
629: */
630:
631: protected synchronized void notifyConnection(HttpConnection conn) {
1.94 ylafon 632: if (debug)
633: System.out.println(conn + "+++ notify conn_count " + (conn_count + 1)
634: + " / " + conn_max);
635: if (++conn_count > conn_max)
636: closeAnyConnection();
1.9 abaird 637: }
638:
639: /**
640: * The given connection has been deleted.
1.94 ylafon 641: *
1.9 abaird 642: * @param conn The deleted connection.
643: */
644:
1.83 ylafon 645: protected synchronized void deleteConnection(HttpConnection conn) {
1.94 ylafon 646: --conn_count;
647: connectionsLru.remove(conn);
648: if (debug)
649: System.out.println(conn + "+++ delete conn_count: " + conn_count);
650: notifyAll();
1.9 abaird 651: }
652:
653: protected synchronized boolean tooManyConnections() {
1.94 ylafon 654: return conn_count >= conn_max;
1.9 abaird 655: }
656:
657: /**
658: * Try reusing one of the idle connection of that server, if any.
1.94 ylafon 659: *
1.9 abaird 660: * @param server The target server.
661: * @return An currently idle connection to the given server.
1.4 abaird 662: */
663:
1.83 ylafon 664: protected synchronized HttpConnection getConnection(HttpServer server) {
1.94 ylafon 665: HttpServerState ss = server.getState();
666: HttpConnection hcn = ss.getConnection();
667: if (hcn != null) {
668: notifyUse(hcn);
669: }
670: return hcn;
1.9 abaird 671: }
672:
1.47 ylafon 673: /**
674: * Wait for a connection to come up.
1.94 ylafon 675: *
1.47 ylafon 676: * @param server, the target server.
1.94 ylafon 677: * @throws InterruptedException If interrupted..
1.47 ylafon 678: */
679:
1.9 abaird 680: protected synchronized void waitForConnection(HttpServer server)
1.94 ylafon 681: throws InterruptedException {
682: wait(30000); // FIXME should be tunable, now set to 30s
1.4 abaird 683: }
684:
685: /**
1.60 ylafon 686: * Close some connections, but pickling the least recently used ones.
1.94 ylafon 687: * One third of the max number of connection is cut. This is done to
1.45 ylafon 688: * eliminate the old connections that should be broken already.
689: * (no Socket.isAlive());
1.94 ylafon 690: *
1.9 abaird 691: * @return A boolean, <strong>true</strong> if a connection was closed
1.94 ylafon 692: * <strong>false</strong> otherwise.
1.4 abaird 693: */
694:
1.83 ylafon 695: protected synchronized boolean closeAnyConnection() {
1.94 ylafon 696: boolean saved = false;
697: int max = Math.max(conn_max / 3, 1);
698: for (int i = 0; i < max; i++) {
699: HttpConnection conn = (HttpConnection) connectionsLru.removeTail();
700: if (conn != null) {
701: conn.close();
702: if (debug)
703: System.out.println("+++ close request");
704: saved = true;
705: } else {
706: break;
707: }
708: }
709: // now purge the server Hashtable
710: synchronized (servers) {
711: Enumeration e = servers.keys();
712: if (debug) {
713: System.out.println("+++ hashtable purge starting: "
714: + servers.size() + " entries");
715: }
716: int nbconn = 0;
717: int rnbconn = 0;
718: int nbkept = 0;
719: while (e.hasMoreElements()) {
720: String id = (String) e.nextElement();
721: if (id != null) {
722: HttpServer server = (HttpServer) servers.get(id);
723: int conn_count = server.state.getConnectionCount();
724: if (conn_count <= 0) {
725: if (debug) {
726: System.out.println("+++ hashtable purge: " + id);
727: }
728: servers.remove(id);
729: } else {
730: if (debug) {
731: nbkept++;
732: nbconn += server.state.getConnectionCount();
733: if (server.state.conns != null) {
734: rnbconn += server.state.conns.size();
735: }
736: System.out.println("+++ hashtable keep: " + id
737: + " ( "
738: + server.state.getConnectionCount()
739: + ((server.state.conns != null) ?
740: " idle) ( real: " + server.state.conns.size() + ")" :
741: " idle)")
742: + server.state);
743: }
744: }
745: }
746: }
747: if (debug) {
748: System.out.println("+++ hashtable purge done, keeping "
749: + servers.size() + " entries");
750: System.out.println("+++ hashtable stats, keeping "
751: + nbconn + " ( " + rnbconn
752: + " ) connections for " + nbkept
753: + " servers ( "
754: + ((float) nbconn / (float) nbkept) + " )");
755: }
756: }
757: return saved;
1.4 abaird 758: }
759:
760: /**
1.1 abaird 761: * One of our server handler wants to open a connection.
1.94 ylafon 762: *
1.1 abaird 763: * @param block A boolean indicating whether we should block the calling
1.94 ylafon 764: * thread until a token is available (otherwise, the method will just
765: * peek at the connection count, and return the appropriate result).
1.1 abaird 766: * @return A boolean, <strong>true</strong> if the connection can be
1.94 ylafon 767: * opened straight, <strong>false</strong> otherwise.
1.1 abaird 768: */
769:
1.9 abaird 770: protected boolean negotiateConnection(HttpServer server) {
1.94 ylafon 771: HttpServerState ss = server.getState();
772: if (!tooManyConnections()) {
773: return true;
774: } else if (ss.notEnoughConnections()) {
775: return closeAnyConnection();
776: } else if (servers.size() > conn_max) {
777: return closeAnyConnection();
778: }
779: return false;
1.60 ylafon 780: }
781:
782: /**
783: * A new client connection has been established.
784: * This method will try to maintain a maximum number of established
785: * connections, by closing idle connections when possible.
1.94 ylafon 786: *
1.60 ylafon 787: * @param server The server that has established a new connection.
788: */
789:
790: protected final synchronized void incrConnCount(HttpServer server) {
1.94 ylafon 791: if (++conn_count > conn_max)
792: closeAnyConnection();
793: if (debug)
794: System.out.println("+++ incr conn_count: " + conn_count);
1.60 ylafon 795: }
796:
797: /**
798: * Decrement the number of established connections.
1.94 ylafon 799: *
1.60 ylafon 800: * @param server The server that has closed one connection to its target.
801: */
802:
803: protected final synchronized void decrConnCount(HttpServer server) {
1.94 ylafon 804: --conn_count;
805: if (debug)
806: System.out.println("+++ decr conn_count: " + conn_count);
807: if (conn_count < 0) {
808: System.err.println(this);
809: }
1.1 abaird 810: }
811:
812: /**
813: * Run the given request, in synchronous mode.
814: * This method will launch the given request, and block the calling thread
815: * until the response headers are available.
1.94 ylafon 816: *
1.1 abaird 817: * @param request The request to run.
1.94 ylafon 818: * @return An instance of Reply, containing all the reply
819: * informations.
820: * @throws HttpException If something failed during request processing.
1.1 abaird 821: */
1.65 ylafon 822:
1.1 abaird 823: public Reply runRequest(Request request)
1.94 ylafon 824: throws HttpException {
825: Reply reply = null;
826: int fcalls = 0;
827: // Now run through the ingoing filters:
828: RequestFilter filters[] = filteng.run(request);
829: if (filters != null) {
830: for (RequestFilter filter : filters) {
831: if ((reply = filter.ingoingFilter(request)) != null)
832: break;
833: fcalls++;
834: }
835: }
836: // Locate the appropriate target server:
837: URL target = request.getURL();
838: if (reply == null) {
839: HttpServer srv = null;
840: boolean rtry;
841: do {
842: rtry = false;
843: try {
844: URL proxy = request.getProxy();
845: if (proxy != null)
846: srv = lookupServer(proxy.getHost(), proxy.getPort());
847: else
848: srv = lookupServer(target.getHost(), target.getPort());
849: request.setServer(srv);
850: reply = srv.runRequest(request);
851: } catch (HttpException ex) {
852: for (int i = 0; i < fcalls; i++)
853: rtry = rtry || filters[i].exceptionFilter(request, ex);
854: if (!rtry)
855: throw ex;
856: // } finally {
1.88 ylafon 857: // request.unsetServer();
1.94 ylafon 858: }
859: } while (rtry);
860: }
861: // Apply the filters on the way back:
862: if (filters != null) {
863: while (--fcalls >= 0) {
864: Reply frep = filters[fcalls].outgoingFilter(request, reply);
865: if (frep != null) {
866: reply = frep;
867: break;
868: }
869: }
870: }
871: return reply;
1.1 abaird 872: }
873:
874: /**
875: * Get this manager's reply factory.
876: * The Reply factory is used when prsing incomming reply from servers, it
1.94 ylafon 877: * decides what object will be created to hold the actual reply from the
1.1 abaird 878: * server.
1.94 ylafon 879: *
1.1 abaird 880: * @return An object compatible with the MimeParserFactory interface.
881: */
882:
1.94 ylafon 883: MimeParserFactory factory = null;
1.1 abaird 884:
1.9 abaird 885: public MimeParserFactory getReplyFactory() {
1.94 ylafon 886: if (factory == null) {
887: factory = new ReplyFactory();
888: }
889: return factory;
1.1 abaird 890: }
891:
892: /**
893: * Add a new request filter.
894: * Request filters are called <em>before</em> a request is launched, and
895: * <em>after</em> the reply headers are available. They allow applications
896: * to setup specific request headers (such as PICS, or PEP stuff) on the
897: * way in, and check the reply on the way out.
898: * <p>Request filters are application wide: if their scope matches
899: * the current request, then they will always be aplied.
900: * <p>Filter scopes are defined inclusively and exclusively
1.94 ylafon 901: *
902: * @param incs The URL domains for which the filter should be triggered.
903: * @param exs The URL domains for which the filter should not be triggered.
1.1 abaird 904: * @param filter The request filter to add.
905: */
906:
907: public void setFilter(URL incs[], URL exs[], RequestFilter filter) {
1.94 ylafon 908: if (incs != null) {
909: for (URL inc : incs) {
910: filteng.setFilter(inc, true, filter);
911: }
912: }
913: if (exs != null) {
914: for (URL ex : exs) {
915: filteng.setFilter(ex, false, filter);
916: }
917: }
1.1 abaird 918: }
919:
1.15 abaird 920: /**
921: * Add a global filter.
922: * The given filter will <em>always</em> be invoked.
1.94 ylafon 923: *
1.15 abaird 924: * @param filter The filter to install.
925: */
1.65 ylafon 926:
1.1 abaird 927: public void setFilter(RequestFilter filter) {
1.94 ylafon 928: filteng.setFilter(filter);
1.1 abaird 929: }
930:
931: /**
1.15 abaird 932: * Find back an instance of a global filter.
933: * This methods allow external classes to get a pointer to installed
934: * filters of a given class.
1.94 ylafon 935: *
1.15 abaird 936: * @param cls The class of the filter to look for.
937: * @return A RequestFilter instance, or <strong>null</strong> if not
1.94 ylafon 938: * found.
1.1 abaird 939: */
940:
1.15 abaird 941: public RequestFilter getGlobalFilter(Class cls) {
1.94 ylafon 942: return filteng.getGlobalFilter(cls);
1.1 abaird 943: }
944:
945: /**
946: * Create a new default outgoing request.
947: * This method should <em>always</em> be used to create outgoing requests.
1.94 ylafon 948: * It will initialize the request with appropriate default values for
1.1 abaird 949: * the various headers, and make sure that the request is enhanced by
950: * the registered request filters.
1.94 ylafon 951: *
1.1 abaird 952: * @return An instance of Request, suitable to be launched.
953: */
954:
955: public Request createRequest() {
1.94 ylafon 956: return (Request) template.getDeeperClone();
1.1 abaird 957: }
958:
959: /**
960: * Global settings - Set the max number of allowed connections.
961: * Set the maximum number of simultaneous connections that can remain
962: * opened. The manager will take care of queuing requests if this number
963: * is reached.
1.94 ylafon 964: * <p>This value defaults to the value of the
1.82 ylafon 965: * <code>org.w3c.www.http.connections.max</code> property.
1.94 ylafon 966: *
1.1 abaird 967: * @param max_conn The allowed maximum simultaneous open connections.
968: */
969:
1.13 abaird 970: public synchronized void setMaxConnections(int max_conn) {
1.94 ylafon 971: this.conn_max = max_conn;
1.35 ylafon 972: }
973:
974: /**
975: * Global settings - Set the timeout on the socket
1.94 ylafon 976: * <p/>
977: * <p>This value defaults to the value of the
978: * <code>org.w3c.www.http.connections.timeout</code> property.
1.35 ylafon 979: *
980: * @param timeout The allowed maximum microsecond before a timeout.
981: */
982:
983: public synchronized void setTimeout(int timeout) {
1.94 ylafon 984: this.timeout = timeout;
985: Enumeration e = servers.elements();
986: while (e.hasMoreElements()) {
987: ((HttpServer) e.nextElement()).setTimeout(timeout);
988: }
1.62 ylafon 989: }
990:
991: /**
1.82 ylafon 992: * Global settings - Set the connection timeout for the socket
1.94 ylafon 993: * <p/>
994: * <p>This value defaults to the value of the
995: * <code>org.w3c.www.protocol.http.connections.connTimeout</code> property
1.82 ylafon 996: *
1.94 ylafon 997: * @param conn_timeout The allowed maximum microsecond before a timeout.
1.82 ylafon 998: */
999:
1000: public synchronized void setConnTimeout(int conn_timeout) {
1.94 ylafon 1001: this.conn_timeout = conn_timeout;
1002: Enumeration e = servers.elements();
1003: while (e.hasMoreElements()) {
1004: ((HttpServer) e.nextElement()).setConnTimeout(conn_timeout);
1005: }
1.82 ylafon 1006: }
1007:
1008: /**
1.62 ylafon 1009: * Global settings - set the HTTP parsing lenient or not.
1.94 ylafon 1010: *
1.62 ylafon 1011: * @param lenient, true by default, false to detect wrong servers
1012: */
1013: public void setLenient(boolean lenient) {
1.94 ylafon 1014: this.lenient = lenient;
1.62 ylafon 1015: }
1016:
1017: /**
1018: * Is this manager parsing headers in a lenient way?
1.94 ylafon 1019: *
1.62 ylafon 1020: * @return A boolean.
1021: */
1022: public boolean isLenient() {
1.94 ylafon 1023: return lenient;
1.1 abaird 1024: }
1025:
1026: /**
1027: * Global settings - Set an optional proxy to use.
1028: * Set the proxy to which all requests should be targeted. If the
1.38 bmahe 1029: * <code>org.w3c.www.http.proxy</code> property is defined, it will be
1.1 abaird 1030: * used as the default value.
1.94 ylafon 1031: *
1.1 abaird 1032: * @param proxy The URL for the proxy to use.
1033: */
1034:
1035: public void setProxy(URL proxy) {
1.94 ylafon 1036: template.setProxy(proxy);
1.30 abaird 1037: }
1038:
1039: /**
1040: * Does this manager uses a proxy to fulfill requests ?
1.94 ylafon 1041: *
1.30 abaird 1042: * @return A boolean.
1043: */
1044:
1045: public boolean usingProxy() {
1.94 ylafon 1046: return template.hasProxy();
1.1 abaird 1047: }
1048:
1049: /**
1050: * Global settings - Set the request timeout.
1.94 ylafon 1051: * Once a request has been emited, the HttpManager will sit for this
1.1 abaird 1052: * given number of milliseconds before the request is declared to have
1053: * timed-out.
1054: * <p>This timeout value defaults to the value of the
1.38 bmahe 1055: * <code>org.w3c.www.http.requestTimeout</code> property value.
1.94 ylafon 1056: *
1.1 abaird 1057: * @param ms The timeout value in milliseconds.
1058: */
1059:
1060: public void setRequestTimeout(int ms) {
1061: }
1062:
1063: /**
1064: * Global settings - Define a global request header.
1065: * Set a default value for some request header. Once defined, the
1066: * header will automatically be defined on <em>all</em> outgoing requests
1067: * created through the <code>createRequest</code> request.
1.94 ylafon 1068: *
1069: * @param name The name of the header, case insensitive.
1.1 abaird 1070: * @param value It's default value.
1071: */
1.65 ylafon 1072:
1.1 abaird 1073: public void setGlobalHeader(String name, String value) {
1.94 ylafon 1074: template.setValue(name, value);
1.1 abaird 1075: }
1076:
1.18 abaird 1077: /**
1078: * Global settings - Get a global request header default value.
1.94 ylafon 1079: *
1.18 abaird 1080: * @param name The name of the header to get.
1081: * @return The value for that header, as a String, or <strong>
1.94 ylafon 1082: * null</strong> if undefined.
1.18 abaird 1083: */
1084:
1.1 abaird 1085: public String getGlobalHeader(String name) {
1.94 ylafon 1086: return template.getValue(name);
1.18 abaird 1087: }
1088:
1.94 ylafon 1089:
1.18 abaird 1090: /**
1091: * Dump all in-memory cached state to persistent storage.
1092: */
1093:
1094: public void sync() {
1.94 ylafon 1095: filteng.sync();
1.1 abaird 1096: }
1097:
1098: /**
1099: * Create a new HttpManager.
1.33 abaird 1100: * FIXME Making this method protected breaks the static method
1101: * to create HttpManager instances (should use a factory here)
1.94 ylafon 1102: *
1103: * @param props The properties from which the manager should initialize
1104: * itself, or <strong>null</strong> if none are available.
1.1 abaird 1105: */
1106:
1.33 abaird 1107: protected HttpManager() {
1.94 ylafon 1108: this.template = new Request(this);
1109: this.servers = new Hashtable();
1110: this._tmp_servers = new Hashtable();
1111: this.filteng = new FilterEngine();
1112: this.connectionsLru = new SyncLRUList();
1.1 abaird 1113: }
1114:
1.83 ylafon 1115:
1.1 abaird 1116: /**
1117: * DEBUGGING !
1118: */
1119:
1.83 ylafon 1120: public synchronized String toString() {
1.94 ylafon 1121: StringBuilder sb = new StringBuilder();
1122: HttpConnection hcn = (HttpConnection) connectionsLru.getHead();
1123: sb.append("Connections: ");
1124: sb.append(conn_count);
1125: sb.append(" out of ");
1126: sb.append(conn_max);
1127: sb.append("\n\n");
1128: if (hcn != null) {
1129: sb.append("**** Idle Connections list ****\n");
1130: while (hcn != null) {
1131: sb.append(" ");
1132: sb.append(hcn.toString());
1133: sb.append('\n');
1134: try {
1135: hcn = (HttpConnection) hcn.getNext();
1136: } catch (ClassCastException ccex) {
1137: break;
1138: }
1139: }
1140: } else {
1141: sb.append("*** NO IDLE CONNECTIONS ***\n");
1142: }
1143: sb.append(servers);
1144: return sb.toString();
1.83 ylafon 1145: }
1146:
1.1 abaird 1147: public static void main(String args[]) {
1.94 ylafon 1148: try {
1149: // Get the manager, and define some global headers:
1150: HttpManager manager = HttpManager.getManager();
1151: manager.setGlobalHeader("User-Agent", DEFAULT_USER_AGENT);
1152: manager.setGlobalHeader("Accept", "*/*;q=1.0");
1153: manager.setGlobalHeader("Accept-Encoding", "gzip");
1154: PropRequestFilter filter =
1155: new org.w3c.www.protocol.http.cookies.CookieFilter();
1156: filter.initialize(manager);
1157: PropRequestFilter pdebug =
1158: new org.w3c.www.protocol.http.DebugFilter();
1159: pdebug.initialize(manager);
1160: Request request = manager.createRequest();
1161: request.setURL(new URL(args[0]));
1162: request.setMethod("GET");
1163: Reply reply = manager.runRequest(request);
1164: //Display some infos:
1165: System.out.println("last-modified: " + reply.getLastModified());
1166: System.out.println("length : " + reply.getContentLength());
1167: // Display the returned body:
1168: InputStream in = reply.getInputStream();
1169: byte buf[] = new byte[4096];
1170: int cnt = 0;
1171: while ((cnt = in.read(buf)) >= 0) {
1.83 ylafon 1172: // System.out.print(new String(buf, 0, cnt));
1.94 ylafon 1173: }
1174: System.out.println("-");
1175: in.close();
1176: manager.sync();
1177: System.err.println(manager);
1178: } catch (Exception ex) {
1179: ex.printStackTrace();
1180: if (ex instanceof HttpException) {
1181: ((HttpException) ex).getException().printStackTrace();
1182: }
1183: }
1184: System.exit(1);
1.1 abaird 1185: }
1186: }
1.34 bmahe 1187:
1188:
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