Annotation of java/classes/org/w3c/www/protocol/http/HttpManager.java, revision 1.18
1.1 abaird 1: // HttpManager.java
1.18 ! abaird 2: // $Id: HttpManager.java,v 1.17 1996/11/13 17:18:34 abaird Exp $
1.1 abaird 3: // (c) COPYRIGHT MIT and INRIA, 1996.
4: // Please first read the full copyright statement in file COPYRIGHT.html
5:
6: package w3c.www.protocol.http ;
7:
8: import java.util.*;
9: import java.net.*;
10: import java.io.*; // FIXME - DEBUG
11:
12: import w3c.www.mime.*;
1.4 abaird 13: import w3c.util.*;
1.1 abaird 14:
15: class ReplyFactory implements MimeParserFactory {
16:
17: public MimeHeaderHolder createHeaderHolder(MimeParser parser) {
18: return new Reply(parser);
19: }
20:
21: }
22:
1.9 abaird 23: class HttpServerState {
24: HttpServer server = null;
25: Vector conns = null;
26:
27: final HttpServer getServer() {
28: return server;
29: }
30:
31: synchronized boolean notEnoughConnections() {
32: return (conns == null) || (conns.size() == 1);
33: }
34:
35: void registerConnection(HttpConnection conn) {
36: if ( conns == null )
37: conns = new Vector(4);
38: conns.addElement(conn);
39: }
40:
41: void unregisterConnection(HttpConnection conn) {
42: if ( conns != null )
43: conns.removeElement(conn);
44: }
45:
46: void deleteConnection(HttpConnection conn) {
47: // conn.close();
48: if ( conns != null )
49: conns.removeElement(conn);
50: }
51:
52: synchronized HttpConnection getConnection() {
53: if ((conns != null) && (conns.size() > 0)) {
54: HttpConnection conn = (HttpConnection) conns.elementAt(0);
55: conns.removeElementAt(0);
56: return conn;
57: }
58: return null;
59: }
60:
61: HttpServerState(HttpServer server) {
62: this.server = server;
63: }
64: }
1.1 abaird 65:
66: /**
67: * The client side HTTP request manager.
68: * This class is the user interface (along with the other public classes of
69: * this package) for the W3C client side library implementing HTTP.
70: * A typicall request is launched though the following sequence:
71: * <pre>
72: * HttpManager manager = HttpManager.getManager() ;
73: * Request request = manager.makeRequest() ;
74: * request.setMethod(HTTP.GET) ;
75: * request.setURL(new URL("http://www.w3.org/pub/WWW/"));
76: * Reply reply = manager.runRequest(request) ;
77: * // Get the reply input stream that contains the actual data:
78: * InputStream in = reply.getInputStream() ;
79: * ...
80: * </pre>
81: */
82:
1.13 abaird 83: public class HttpManager implements PropertyMonitoring {
1.17 abaird 84: private static final
85: String DEFAULT_SERVER_CLASS = "w3c.www.protocol.http.HttpBasicServer";
86:
87: /**
88: * The name of the property indicating the class of HttpServer to use.
89: */
90: public static final
91: String SERVER_CLASS_P = "w3c.www.protocol.http.server";
92:
1.2 abaird 93: /**
94: * The name of the property containing the ProprequestFilter to launch.
95: */
1.12 abaird 96: public static final
97: String FILTERS_PROP_P = "w3c.www.protocol.http.filters";
1.5 abaird 98: /**
1.11 abaird 99: * The maximum number of simultaneous connections.
100: */
101: public static final
1.12 abaird 102: String CONN_MAX_P = "w3c.www.protocol.http.connections.max";
1.11 abaird 103: /**
1.5 abaird 104: * Header properties - The allowed drift for getting cached resources.
105: */
106: public static final
1.12 abaird 107: String MAX_STALE_P = "w3c.www.protocol.http.cacheControl.maxStale";
1.5 abaird 108: /**
109: * Header properties - The minium freshness required on cached resources.
110: */
111: public static final
1.12 abaird 112: String MIN_FRESH_P = "w3c.www.protocol.http.cacheControl.minFresh";
1.5 abaird 113: /**
114: * Header properties - Set the only if cached flag on requests.
115: */
116: public static final
1.12 abaird 117: String ONLY_IF_CACHED_P="w3c.www.protocol.http.cacheControl.onlyIfCached";
1.5 abaird 118: /**
119: * Header properties - Set the user agent.
120: */
121: public static final
1.12 abaird 122: String USER_AGENT_P = "w3c.www.protocol.http.userAgent";
1.5 abaird 123: /**
124: * Header properties - Set the accept header.
125: */
126: public static final
1.12 abaird 127: String ACCEPT_P = "w3c.www.protocol.http.accept";
1.5 abaird 128: /**
129: * Header properties - Set the accept language.
130: */
131: public static final
1.12 abaird 132: String ACCEPT_LANGUAGE_P = "w3c.www.protocol.http.acceptLanguage";
1.5 abaird 133: /**
134: * Header properties - Set the accept encodings.
135: */
136: public static final
1.12 abaird 137: String ACCEPT_ENCODING_P = "w3c.www.protocol.http.acceptEncoding";
1.5 abaird 138: /**
139: * Header properties - Should we use a proxy ?
140: */
141: public static final
1.12 abaird 142: String PROXY_SET_P = "proxySet";
1.5 abaird 143: /**
144: * Header properties - What is the proxy host name.
145: */
146: public static final
1.12 abaird 147: String PROXY_HOST_P = "proxyHost";
1.5 abaird 148: /**
149: * Header properties - What is the proxy port number.
150: */
151: public static final
1.12 abaird 152: String PROXY_PORT_P = "proxyPort";
1.2 abaird 153:
1.7 abaird 154: /**
155: * The default value for the <code>Accept</code> header.
156: */
157: public static final
158: String DEFAULT_ACCEPT = "*/*";
159: /**
160: * The default value for the <code>User-Agent</code> header.
161: */
162: public static final
163: String DEFAULT_USER_AGENT = "Jigsaw/1.0a2";
164:
1.1 abaird 165: private static HttpManager manager = null;
166:
167: /**
1.17 abaird 168: * The class to instantiate to create new HttpServer instances.
169: */
170: protected Class serverclass = null;
171: /**
1.13 abaird 172: * The properties we initialized from.
173: */
174: ObservableProperties props = null;
175: /**
1.1 abaird 176: * The server this manager knows about, indexed by FQDN of target servers.
177: */
178: protected Hashtable servers = null;
179: /**
180: * The template request (the request we will clone to create new requests)
181: */
1.4 abaird 182: protected Request template = null ;
183: /**
1.9 abaird 184: * The LRU list of connections.
1.4 abaird 185: */
1.9 abaird 186: protected LRUList connectionsLru = null;
1.1 abaird 187: /**
188: * The filter engine attached to this manager.
189: */
190: FilterEngine filteng = null;
191:
1.9 abaird 192: protected int conn_count = 0;
193: protected int conn_max = 5;
194:
1.1 abaird 195: /**
1.13 abaird 196: * Update the proxy configuration to match current properties setting.
197: * @return A boolean, <strong>true</strong> if change was done,
198: * <strong>false</strong> otherwise.
199: */
200:
201: protected boolean updateProxy() {
202: boolean set = props.getBoolean(PROXY_SET_P, false);
203: if ( set ) {
204: // Wow using a proxy now !
205: String host = props.getString(PROXY_HOST_P, null);
206: int port = props.getInteger(PROXY_PORT_P, -1);
207: URL proxy = null;
208: try {
209: proxy = new URL("http", host, port, "/");
210: } catch (Exception ex) {
211: return false;
212: }
213: // Now if a proxy...
214: if ( proxy != null )
215: getManager().template.setProxy(proxy);
216: } else {
217: getManager().template.setProxy(null);
218: }
219: return true;
220: }
221:
222: /**
223: * PropertyMonitoring implementation - Update properties on the fly !
224: * @param name The name of the property that has changed.
225: * @return A boolean, <strong>true</strong> if change is accepted,
226: * <strong>false</strong> otherwise.
227: */
228:
229: public boolean propertyChanged(String name) {
230: Request tpl = getManager().template;
231: if ( name.equals(FILTERS_PROP_P) ) {
232: return false;
233: } else if ( name.equals(CONN_MAX_P) ) {
234: setMaxConnections(props.getInteger(CONN_MAX_P, conn_max));
235: return true;
236: } else if ( name.equals(MAX_STALE_P) ) {
237: int ival = props.getInteger(MAX_STALE_P, -1);
238: if ( ival >= 0 )
239: tpl.setMaxStale(ival);
240: return true;
241: } else if ( name.equals(MIN_FRESH_P) ) {
242: int ival = props.getInteger(MIN_FRESH_P, -1);
243: if ( ival >= 0 )
244: tpl.setMinFresh(ival);
245: return true;
246: } else if ( name.equals(ONLY_IF_CACHED_P) ) {
247: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
248: return true;
249: } else if ( name.equals(USER_AGENT_P) ) {
250: tpl.setValue("user-agent"
251: , props.getString(USER_AGENT_P
252: , DEFAULT_USER_AGENT));
253: return true;
254: } else if ( name.equals(ACCEPT_P) ) {
255: tpl.setValue("accept"
256: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
257: return true;
258: } else if ( name.equals(ACCEPT_LANGUAGE_P) ) {
259: String sval = props.getString(ACCEPT_LANGUAGE_P, null);
260: if ( sval != null )
261: tpl.setValue("accept-language", sval);
262: return true;
263: } else if ( name.equals(ACCEPT_ENCODING_P) ) {
264: String sval = props.getString(ACCEPT_ENCODING_P, null);
265: if ( sval != null )
266: tpl.setValue("accept-encoding", sval);
267: return true;
268: } else if ( name.equals(PROXY_SET_P)
269: || name.equals(PROXY_HOST_P)
270: || name.equals(PROXY_PORT_P) ) {
271: return updateProxy();
272: } else {
273: return true;
274: }
275: }
276:
277: /**
1.4 abaird 278: * Allow the manager to interact with the user if needed.
279: * This will, for example, allow prompting for paswords, etc.
280: * @param onoff Turn interaction on or off.
281: */
282:
283: public void setAllowUserInteraction(boolean onoff) {
284: template.setAllowUserInteraction(onoff);
285: }
286:
287: /**
1.1 abaird 288: * Get an instance of the HTTP manager.
289: * This method returns an actual instance of the HTTP manager. It may
290: * return different managers, if it decides to distribute the load on
291: * different managers (avoid the HttpManager being a bottleneck).
292: * @return An application wide instance of the HTTP manager.
293: */
294:
295: public static synchronized HttpManager getManager() {
296: if ( manager == null ) {
297: manager = new HttpManager() ;
1.11 abaird 298: // Get the props we will initialize from:
299: Properties p = System.getProperties();
300: if ( p instanceof ObservableProperties )
1.13 abaird 301: manager.props = (ObservableProperties) p;
1.11 abaird 302: else
1.13 abaird 303: manager.props = new ObservableProperties(p);
304: ObservableProperties props = manager.props;
1.9 abaird 305: // Initialize this new manager filters:
1.12 abaird 306: String filters[] = props.getStringArray(FILTERS_PROP_P, null);
1.11 abaird 307: if ( filters != null ) {
308: for (int i = 0 ; i < filters.length ; i++) {
309: try {
310: Class c = Class.forName(filters[i]);
311: PropRequestFilter f = null;
312: f = (PropRequestFilter) c.newInstance();
313: f.initialize(manager);
314: } catch (Exception ex) {
315: System.err.println("Error initializing prop filters:");
316: System.err.println("Coulnd't initialize ["
317: + filters[i]
318: + "]: " + ex.getMessage());
319: ex.printStackTrace();
1.17 abaird 320: System.exit(1);
1.11 abaird 321: }
1.2 abaird 322: }
323: }
1.9 abaird 324: // The factory to create MIME reply holders:
325: manager.factory = new ReplyFactory();
1.17 abaird 326: // The class to create HttpServer instances from
327: String c = props.getString(SERVER_CLASS_P, DEFAULT_SERVER_CLASS);
328: try {
329: manager.serverclass = Class.forName(c);
330: } catch (Exception ex) {
331: System.err.println("Unable to initialize HttpManager: ");
332: System.err.println("Class \""+c+"\" not found, from property "
333: + SERVER_CLASS_P);
334: ex.printStackTrace();
335: System.exit(1);
336: }
1.9 abaird 337: // Setup the template request:
1.5 abaird 338: Request tpl = manager.template;
339: // Set some default headers value (from props)
340: // Check for a proxy ?
1.13 abaird 341: manager.updateProxy();
1.5 abaird 342: // CacheControl, only-if-cached
1.12 abaird 343: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
1.5 abaird 344: // CacheControl, maxstale
1.12 abaird 345: int ival = props.getInteger(MAX_STALE_P, -1);
1.11 abaird 346: if ( ival >= 0 )
347: tpl.setMaxStale(ival);
1.5 abaird 348: // CacheControl, minfresh:
1.12 abaird 349: ival = props.getInteger(MIN_FRESH_P, -1);
1.11 abaird 350: if ( ival >= 0 )
351: tpl.setMinFresh(ival);
1.5 abaird 352: // General, User agent
1.11 abaird 353: tpl.setValue("user-agent"
1.12 abaird 354: , props.getString(USER_AGENT_P
1.11 abaird 355: , DEFAULT_USER_AGENT));
1.5 abaird 356: // General, Accept
1.11 abaird 357: tpl.setValue("accept"
1.12 abaird 358: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
1.5 abaird 359: // General, Accept-Language
1.12 abaird 360: String sval = props.getString(ACCEPT_LANGUAGE_P, null);
1.11 abaird 361: if ( sval != null )
362: tpl.setValue("accept-language", sval);
1.5 abaird 363: // General, Accept-Encoding
1.12 abaird 364: sval = props.getString(ACCEPT_ENCODING_P, null);
1.11 abaird 365: if ( sval != null )
366: tpl.setValue("accept-encoding", sval);
367: // Maximum number of allowed connections:
1.12 abaird 368: manager.conn_max = props.getInteger(CONN_MAX_P, 5);
1.13 abaird 369: // Register ourself as a property observer:
370: props.registerObserver(manager);
1.1 abaird 371: }
372: return manager;
373: }
374:
375:
376: /**
377: * Get the appropriate server object for handling request to given target.
378: * @param key The server's identifier encoded as a <code>host:port</code>
379: * String.
380: * @return An object complying to the HttpServer interface.
381: * @exception HttpException If the given host name couldn't be resolved.
382: */
383:
1.5 abaird 384: protected synchronized HttpServer lookupServer(String host, int port)
1.1 abaird 385: throws HttpException
386: {
1.5 abaird 387: int p = (port == -1) ? 80 : port;
388: String id = (p == 80) ? host : (host +":"+p);
1.1 abaird 389: // Check for an existing server:
390: HttpServer server = (HttpServer) servers.get(id);
391: if ( server != null )
392: return server;
393: // Create and register a new server:
1.17 abaird 394: try {
395: server = (HttpServer) serverclass.newInstance();
396: } catch (Exception ex) {
397: String msg = ("Unable to create an instance of \""
398: + serverclass.getName()
399: + "\", invalid config, check the "
400: + SERVER_CLASS_P + " property.");
401: throw new HttpException(msg);
402: }
1.9 abaird 403: server.initialize(this, new HttpServerState(server), host, p);
1.1 abaird 404: servers.put(id, server);
405: return server;
406: }
1.5 abaird 407:
1.1 abaird 408: /**
1.9 abaird 409: * The given connection is about to be used.
1.4 abaird 410: * Update our list of available servers.
1.9 abaird 411: * @param conn The idle connection.
1.4 abaird 412: */
413:
1.9 abaird 414: public void notifyUse(HttpConnection conn) {
415: connectionsLru.remove(conn);
1.4 abaird 416: }
417:
418: /**
1.9 abaird 419: * The given connection can be reused, but is now idle.
420: * @param conn The connection that is now idle.
1.4 abaird 421: */
422:
1.9 abaird 423: public void notifyIdle(HttpConnection conn) {
424: connectionsLru.toHead(conn);
1.4 abaird 425: }
426:
427: /**
1.9 abaird 428: * The given connection has just been created.
429: * @param conn The newly created connection.
430: */
431:
432: protected synchronized void notifyConnection(HttpConnection conn) {
433: if ( ++conn_count > conn_max )
434: closeAnyConnection();
435: }
436:
437: /**
438: * The given connection has been deleted.
439: * @param conn The deleted connection.
440: */
441:
442: protected void deleteConnection(HttpConnection conn) {
443: HttpServerState ss = conn.getServer().getState();
444: ss.deleteConnection(conn);
445: synchronized(this) {
446: --conn_count;
447: notifyAll();
448: }
449: }
450:
451: protected synchronized boolean tooManyConnections() {
452: return conn_count > conn_max;
453: }
454:
455: /**
456: * Try reusing one of the idle connection of that server, if any.
457: * @param server The target server.
458: * @return An currently idle connection to the given server.
1.4 abaird 459: */
460:
1.9 abaird 461: protected HttpConnection getConnection(HttpServer server) {
462: HttpServerState ss = server.getState();
463: return ss.getConnection();
464: }
465:
466: protected synchronized void waitForConnection(HttpServer server)
467: throws InterruptedException
468: {
469: wait();
1.4 abaird 470: }
471:
472: /**
1.9 abaird 473: * Close one connection, but pickling the least recently used one.
474: * @return A boolean, <strong>true</strong> if a connection was closed
475: * <strong>false</strong> otherwise.
1.4 abaird 476: */
477:
1.9 abaird 478: protected boolean closeAnyConnection() {
479: HttpConnection conn = (HttpConnection) connectionsLru.removeTail();
480: if ( conn != null ) {
481: conn.close();
482: deleteConnection(conn);
483: return true;
484: } else {
485: return false;
486: }
1.4 abaird 487: }
488:
489: /**
1.1 abaird 490: * One of our server handler wants to open a connection.
491: * @param block A boolean indicating whether we should block the calling
492: * thread until a token is available (otherwise, the method will just
493: * peek at the connection count, and return the appropriate result).
494: * @return A boolean, <strong>true</strong> if the connection can be
495: * opened straight, <strong>false</strong> otherwise.
496: */
497:
1.9 abaird 498: protected boolean negotiateConnection(HttpServer server) {
499: HttpServerState ss = server.getState();
1.10 abaird 500: if ( ! tooManyConnections() ) {
1.4 abaird 501: return true;
1.10 abaird 502: } else if ( ss.notEnoughConnections() ) {
503: return closeAnyConnection();
1.9 abaird 504: } else if ( servers.size() > conn_max ) {
505: return closeAnyConnection();
1.4 abaird 506: }
1.9 abaird 507: return false;
508: }
509:
510: /**
511: * A new client connection has been established.
512: * This method will try to maintain a maximum number of established
513: * connections, by closing idle connections when possible.
514: * @param server The server that has established a new connection.
515: */
516:
517: protected final synchronized void incrConnCount(HttpServer server) {
518: if ( ++conn_count > conn_max )
519: closeAnyConnection();
520: }
521:
522: /**
523: * Decrement the number of established connections.
524: * @param server The server that has closed one connection to its target.
525: */
526:
527: protected final synchronized void decrConnCount(HttpServer server) {
528: --conn_count;
1.1 abaird 529: }
530:
531: /**
532: * Run the given request, in synchronous mode.
533: * This method will launch the given request, and block the calling thread
534: * until the response headers are available.
535: * @param request The request to run.
536: * @return An instance of Reply, containing all the reply
537: * informations.
538: * @exception HTTPException If something failed during request processing.
539: */
540:
541: public Reply runRequest(Request request)
542: throws HttpException
543: {
544: URL target = request.getURL();
545: // Now run through the ingoing filters:
546: RequestFilter filters[] = filteng.run(request);
547: if ( filters != null ) {
548: for (int i = 0 ; i < filters.length ; i++) {
1.3 abaird 549: Reply fr = filters[i].ingoingFilter(request);
550: if ( fr != null )
551: return fr;
1.1 abaird 552: }
553: }
1.16 abaird 554: // Locate the appropriate target server:
555: HttpServer server = null;
556: URL proxy = request.getProxy();
557: if ( proxy != null ) {
558: server = lookupServer(proxy.getHost(), proxy.getPort());
559: } else {
560: server = lookupServer(target.getHost(), target.getPort());
561: }
1.1 abaird 562: Reply reply = server.runRequest(request);
563: // Apply the filters on the way back:
564: if ( filters != null ) {
1.3 abaird 565: for (int i = 0 ; i < filters.length ; i++) {
566: Reply fr = filters[i].outgoingFilter(request, reply);
567: if ( fr != null )
568: return fr;
569: }
1.1 abaird 570: }
571: return reply;
572: }
573:
574: /**
575: * Get this manager's reply factory.
576: * The Reply factory is used when prsing incomming reply from servers, it
577: * decides what object will be created to hold the actual reply from the
578: * server.
579: * @return An object compatible with the MimeParserFactory interface.
580: */
581:
582: MimeParserFactory factory = null ;
583:
1.9 abaird 584: public MimeParserFactory getReplyFactory() {
1.1 abaird 585: return factory;
586: }
587:
588: /**
589: * Add a new request filter.
590: * Request filters are called <em>before</em> a request is launched, and
591: * <em>after</em> the reply headers are available. They allow applications
592: * to setup specific request headers (such as PICS, or PEP stuff) on the
593: * way in, and check the reply on the way out.
594: * <p>Request filters are application wide: if their scope matches
595: * the current request, then they will always be aplied.
596: * <p>Filter scopes are defined inclusively and exclusively
1.15 abaird 597: * @param incs The URL domains for which the filter should be triggered.
598: * @param exs The URL domains for which the filter should not be triggered.
1.1 abaird 599: * @param filter The request filter to add.
600: */
601:
602: public void setFilter(URL incs[], URL exs[], RequestFilter filter) {
603: if ( incs != null ) {
604: for (int i = 0 ; i < incs.length ; i++)
605: filteng.setFilter(incs[i], true, filter);
606: }
607: if ( exs != null ) {
608: for (int i = 0 ; i < exs.length ; i++)
609: filteng.setFilter(exs[i], false, filter);
610: }
611: return;
612: }
613:
1.15 abaird 614: /**
615: * Add a global filter.
616: * The given filter will <em>always</em> be invoked.
617: * @param filter The filter to install.
618: */
619:
1.1 abaird 620: public void setFilter(RequestFilter filter) {
621: filteng.setFilter(filter);
622: }
623:
624: /**
1.15 abaird 625: * Find back an instance of a global filter.
626: * This methods allow external classes to get a pointer to installed
627: * filters of a given class.
628: * @param cls The class of the filter to look for.
629: * @return A RequestFilter instance, or <strong>null</strong> if not
630: * found.
1.1 abaird 631: */
632:
1.15 abaird 633: public RequestFilter getGlobalFilter(Class cls) {
634: return filteng.getGlobalFilter(cls);
1.1 abaird 635: }
636:
637: /**
638: * Create a new default outgoing request.
639: * This method should <em>always</em> be used to create outgoing requests.
640: * It will initialize the request with appropriate default values for
641: * the various headers, and make sure that the request is enhanced by
642: * the registered request filters.
643: * @return An instance of Request, suitable to be launched.
644: */
645:
646: public Request createRequest() {
647: return (Request) template.getClone() ;
648: }
649:
650: /**
651: * Global settings - Set the max number of allowed connections.
652: * Set the maximum number of simultaneous connections that can remain
653: * opened. The manager will take care of queuing requests if this number
654: * is reached.
655: * <p>This value defaults to the value of the
656: * <code>w3c.www.http.maxConnections</code> property.
657: * @param max_conn The allowed maximum simultaneous open connections.
658: */
659:
1.13 abaird 660: public synchronized void setMaxConnections(int max_conn) {
661: this.conn_max = max_conn;
1.1 abaird 662: }
663:
664: /**
665: * Global settings - Set an optional proxy to use.
666: * Set the proxy to which all requests should be targeted. If the
667: * <code>w3c.www.http.proxy</code> property is defined, it will be
668: * used as the default value.
669: * @param proxy The URL for the proxy to use.
670: */
671:
672: public void setProxy(URL proxy) {
1.5 abaird 673: template.setProxy(proxy);
1.1 abaird 674: }
675:
676: /**
677: * Global settings - Set the request timeout.
678: * Once a request has been emited, the HttpManager will sit for this
679: * given number of milliseconds before the request is declared to have
680: * timed-out.
681: * <p>This timeout value defaults to the value of the
682: * <code>w3c.www.http.requestTimeout</code> property value.
683: * @param ms The timeout value in milliseconds.
684: */
685:
686: public void setRequestTimeout(int ms) {
687: }
688:
689: /**
690: * Global settings - Define a global request header.
691: * Set a default value for some request header. Once defined, the
692: * header will automatically be defined on <em>all</em> outgoing requests
693: * created through the <code>createRequest</code> request.
694: * @param name The name of the header, case insensitive.
695: * @param value It's default value.
696: */
697:
698: public void setGlobalHeader(String name, String value) {
699: template.setValue(name, value);
700: }
701:
1.18 ! abaird 702: /**
! 703: * Global settings - Get a global request header default value.
! 704: * @param name The name of the header to get.
! 705: * @return The value for that header, as a String, or <strong>
! 706: * null</strong> if undefined.
! 707: */
! 708:
1.1 abaird 709: public String getGlobalHeader(String name) {
710: return template.getValue(name);
1.18 ! abaird 711: }
! 712:
! 713:
! 714: /**
! 715: * Dump all in-memory cached state to persistent storage.
! 716: */
! 717:
! 718: public void sync() {
! 719: filteng.sync();
1.1 abaird 720: }
721:
722: /**
723: * Create a new HttpManager.
724: * This can only be called from this package. The caller must rather
725: * use the <code>getManager</code> method.
726: * @param props The properties from which the manager should initialize
727: * itself, or <strong>null</strong> if none are available.
728: */
729:
730: HttpManager(Properties props) {
1.9 abaird 731: this.template = new Request(this);
732: this.servers = new Hashtable();
733: this.filteng = new FilterEngine();
734: this.connectionsLru = new SyncLRUList();
1.1 abaird 735: }
736:
737: HttpManager() {
738: this(System.getProperties());
739: }
740:
741: /**
742: * DEBUGGING !
743: */
744:
745: public static void main(String args[]) {
746: try {
747: // Get the manager, and define some global headers:
748: HttpManager manager = HttpManager.getManager();
749: manager.setGlobalHeader("User-Agent", "Jigsaw/1.0a");
750: manager.setGlobalHeader("Accept", "*/*;q=1.0");
751: manager.setGlobalHeader("Accept-Encoding", "gzip");
752: Request request = manager.createRequest();
753: request.setURL(new URL(args[0]));
754: request.setMethod("GET");
755: Reply reply = manager.runRequest(request);
756: // Display some infos:
757: System.out.println("last-modified: "+reply.getLastModified());
758: System.out.println("length : "+reply.getContentLength());
759: // Display the returned body:
760: InputStream in = reply.getInputStream();
761: byte buf[] = new byte[4096];
762: int cnt = 0;
763: while ((cnt = in.read(buf)) > 0)
764: System.out.print(new String(buf, 0, 0, cnt));
765: System.out.println("-");
766: in.close();
767: } catch (Exception ex) {
768: ex.printStackTrace();
769: }
770: System.exit(1);
771: }
772: }
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