Annotation of java/classes/org/w3c/www/protocol/http/HttpManager.java, revision 1.14
1.1 abaird 1: // HttpManager.java
1.14 ! abaird 2: // $Id: HttpManager.java,v 1.13 1996/09/25 14:18:53 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 {
1.4 abaird 84:
1.2 abaird 85: /**
86: * The name of the property containing the ProprequestFilter to launch.
87: */
1.12 abaird 88: public static final
89: String FILTERS_PROP_P = "w3c.www.protocol.http.filters";
1.5 abaird 90: /**
1.11 abaird 91: * The maximum number of simultaneous connections.
92: */
93: public static final
1.12 abaird 94: String CONN_MAX_P = "w3c.www.protocol.http.connections.max";
1.11 abaird 95: /**
1.5 abaird 96: * Header properties - The allowed drift for getting cached resources.
97: */
98: public static final
1.12 abaird 99: String MAX_STALE_P = "w3c.www.protocol.http.cacheControl.maxStale";
1.5 abaird 100: /**
101: * Header properties - The minium freshness required on cached resources.
102: */
103: public static final
1.12 abaird 104: String MIN_FRESH_P = "w3c.www.protocol.http.cacheControl.minFresh";
1.5 abaird 105: /**
106: * Header properties - Set the only if cached flag on requests.
107: */
108: public static final
1.12 abaird 109: String ONLY_IF_CACHED_P="w3c.www.protocol.http.cacheControl.onlyIfCached";
1.5 abaird 110: /**
111: * Header properties - Set the user agent.
112: */
113: public static final
1.12 abaird 114: String USER_AGENT_P = "w3c.www.protocol.http.userAgent";
1.5 abaird 115: /**
116: * Header properties - Set the accept header.
117: */
118: public static final
1.12 abaird 119: String ACCEPT_P = "w3c.www.protocol.http.accept";
1.5 abaird 120: /**
121: * Header properties - Set the accept language.
122: */
123: public static final
1.12 abaird 124: String ACCEPT_LANGUAGE_P = "w3c.www.protocol.http.acceptLanguage";
1.5 abaird 125: /**
126: * Header properties - Set the accept encodings.
127: */
128: public static final
1.12 abaird 129: String ACCEPT_ENCODING_P = "w3c.www.protocol.http.acceptEncoding";
1.5 abaird 130: /**
131: * Header properties - Should we use a proxy ?
132: */
133: public static final
1.12 abaird 134: String PROXY_SET_P = "proxySet";
1.5 abaird 135: /**
136: * Header properties - What is the proxy host name.
137: */
138: public static final
1.12 abaird 139: String PROXY_HOST_P = "proxyHost";
1.5 abaird 140: /**
141: * Header properties - What is the proxy port number.
142: */
143: public static final
1.12 abaird 144: String PROXY_PORT_P = "proxyPort";
1.2 abaird 145:
1.7 abaird 146: /**
147: * The default value for the <code>Accept</code> header.
148: */
149: public static final
150: String DEFAULT_ACCEPT = "*/*";
151: /**
152: * The default value for the <code>User-Agent</code> header.
153: */
154: public static final
155: String DEFAULT_USER_AGENT = "Jigsaw/1.0a2";
156:
1.1 abaird 157: private static HttpManager manager = null;
158:
159: /**
1.13 abaird 160: * The properties we initialized from.
161: */
162: ObservableProperties props = null;
163: /**
1.1 abaird 164: * The server this manager knows about, indexed by FQDN of target servers.
165: */
166: protected Hashtable servers = null;
167: /**
168: * The template request (the request we will clone to create new requests)
169: */
1.4 abaird 170: protected Request template = null ;
171: /**
1.9 abaird 172: * The LRU list of connections.
1.4 abaird 173: */
1.9 abaird 174: protected LRUList connectionsLru = null;
1.1 abaird 175: /**
176: * The filter engine attached to this manager.
177: */
178: FilterEngine filteng = null;
179:
180:
1.9 abaird 181: protected int conn_count = 0;
182: protected int conn_max = 5;
183:
1.1 abaird 184: /**
1.13 abaird 185: * Update the proxy configuration to match current properties setting.
186: * @return A boolean, <strong>true</strong> if change was done,
187: * <strong>false</strong> otherwise.
188: */
189:
190: protected boolean updateProxy() {
191: boolean set = props.getBoolean(PROXY_SET_P, false);
192: if ( set ) {
193: System.out.println("Using proxy !");
194: // Wow using a proxy now !
195: String host = props.getString(PROXY_HOST_P, null);
196: int port = props.getInteger(PROXY_PORT_P, -1);
197: URL proxy = null;
198: try {
199: proxy = new URL("http", host, port, "/");
200: } catch (Exception ex) {
201: return false;
202: }
203: // Now if a proxy...
204: if ( proxy != null )
205: getManager().template.setProxy(proxy);
206: } else {
207: getManager().template.setProxy(null);
208: }
209: return true;
210: }
211:
212: /**
213: * PropertyMonitoring implementation - Update properties on the fly !
214: * @param name The name of the property that has changed.
215: * @return A boolean, <strong>true</strong> if change is accepted,
216: * <strong>false</strong> otherwise.
217: */
218:
219: public boolean propertyChanged(String name) {
220: Request tpl = getManager().template;
221: if ( name.equals(FILTERS_PROP_P) ) {
222: return false;
223: } else if ( name.equals(CONN_MAX_P) ) {
224: setMaxConnections(props.getInteger(CONN_MAX_P, conn_max));
225: return true;
226: } else if ( name.equals(MAX_STALE_P) ) {
227: int ival = props.getInteger(MAX_STALE_P, -1);
228: if ( ival >= 0 )
229: tpl.setMaxStale(ival);
230: return true;
231: } else if ( name.equals(MIN_FRESH_P) ) {
232: int ival = props.getInteger(MIN_FRESH_P, -1);
233: if ( ival >= 0 )
234: tpl.setMinFresh(ival);
235: return true;
236: } else if ( name.equals(ONLY_IF_CACHED_P) ) {
237: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
238: return true;
239: } else if ( name.equals(USER_AGENT_P) ) {
240: tpl.setValue("user-agent"
241: , props.getString(USER_AGENT_P
242: , DEFAULT_USER_AGENT));
243: return true;
244: } else if ( name.equals(ACCEPT_P) ) {
245: tpl.setValue("accept"
246: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
247: return true;
248: } else if ( name.equals(ACCEPT_LANGUAGE_P) ) {
249: String sval = props.getString(ACCEPT_LANGUAGE_P, null);
250: if ( sval != null )
251: tpl.setValue("accept-language", sval);
252: return true;
253: } else if ( name.equals(ACCEPT_ENCODING_P) ) {
254: String sval = props.getString(ACCEPT_ENCODING_P, null);
255: if ( sval != null )
256: tpl.setValue("accept-encoding", sval);
257: return true;
258: } else if ( name.equals(PROXY_SET_P)
259: || name.equals(PROXY_HOST_P)
260: || name.equals(PROXY_PORT_P) ) {
261: return updateProxy();
262: } else {
263: return true;
264: }
265: }
266:
267: /**
1.4 abaird 268: * Allow the manager to interact with the user if needed.
269: * This will, for example, allow prompting for paswords, etc.
270: * @param onoff Turn interaction on or off.
271: */
272:
273: public void setAllowUserInteraction(boolean onoff) {
274: template.setAllowUserInteraction(onoff);
275: }
276:
277: /**
1.1 abaird 278: * Get an instance of the HTTP manager.
279: * This method returns an actual instance of the HTTP manager. It may
280: * return different managers, if it decides to distribute the load on
281: * different managers (avoid the HttpManager being a bottleneck).
282: * @return An application wide instance of the HTTP manager.
283: */
284:
285: public static synchronized HttpManager getManager() {
286: if ( manager == null ) {
287: manager = new HttpManager() ;
1.11 abaird 288: // Get the props we will initialize from:
289: Properties p = System.getProperties();
290: if ( p instanceof ObservableProperties )
1.13 abaird 291: manager.props = (ObservableProperties) p;
1.11 abaird 292: else
1.13 abaird 293: manager.props = new ObservableProperties(p);
294: ObservableProperties props = manager.props;
1.9 abaird 295: // Initialize this new manager filters:
1.12 abaird 296: String filters[] = props.getStringArray(FILTERS_PROP_P, null);
1.11 abaird 297: if ( filters != null ) {
298: for (int i = 0 ; i < filters.length ; i++) {
299: try {
300: Class c = Class.forName(filters[i]);
301: PropRequestFilter f = null;
302: f = (PropRequestFilter) c.newInstance();
303: f.initialize(manager);
304: } catch (Exception ex) {
305: System.err.println("Error initializing prop filters:");
306: System.err.println("Coulnd't initialize ["
307: + filters[i]
308: + "]: " + ex.getMessage());
309: ex.printStackTrace();
310: }
1.2 abaird 311: }
312: }
1.9 abaird 313: // The factory to create MIME reply holders:
314: manager.factory = new ReplyFactory();
315: // Setup the template request:
1.5 abaird 316: Request tpl = manager.template;
317: // Set some default headers value (from props)
318: // Check for a proxy ?
1.13 abaird 319: manager.updateProxy();
1.5 abaird 320: // CacheControl, only-if-cached
1.12 abaird 321: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
1.5 abaird 322: // CacheControl, maxstale
1.12 abaird 323: int ival = props.getInteger(MAX_STALE_P, -1);
1.11 abaird 324: if ( ival >= 0 )
325: tpl.setMaxStale(ival);
1.5 abaird 326: // CacheControl, minfresh:
1.12 abaird 327: ival = props.getInteger(MIN_FRESH_P, -1);
1.11 abaird 328: if ( ival >= 0 )
329: tpl.setMinFresh(ival);
1.5 abaird 330: // General, User agent
1.11 abaird 331: tpl.setValue("user-agent"
1.12 abaird 332: , props.getString(USER_AGENT_P
1.11 abaird 333: , DEFAULT_USER_AGENT));
1.5 abaird 334: // General, Accept
1.11 abaird 335: tpl.setValue("accept"
1.12 abaird 336: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
1.5 abaird 337: // General, Accept-Language
1.12 abaird 338: String sval = props.getString(ACCEPT_LANGUAGE_P, null);
1.11 abaird 339: if ( sval != null )
340: tpl.setValue("accept-language", sval);
1.5 abaird 341: // General, Accept-Encoding
1.12 abaird 342: sval = props.getString(ACCEPT_ENCODING_P, null);
1.11 abaird 343: if ( sval != null )
344: tpl.setValue("accept-encoding", sval);
345: // Maximum number of allowed connections:
1.12 abaird 346: manager.conn_max = props.getInteger(CONN_MAX_P, 5);
1.13 abaird 347: // Register ourself as a property observer:
348: props.registerObserver(manager);
1.1 abaird 349: }
350: return manager;
351: }
352:
353:
354: /**
355: * Get the appropriate server object for handling request to given target.
356: * @param key The server's identifier encoded as a <code>host:port</code>
357: * String.
358: * @return An object complying to the HttpServer interface.
359: * @exception HttpException If the given host name couldn't be resolved.
360: */
361:
1.5 abaird 362: protected synchronized HttpServer lookupServer(String host, int port)
1.1 abaird 363: throws HttpException
364: {
1.5 abaird 365: int p = (port == -1) ? 80 : port;
366: String id = (p == 80) ? host : (host +":"+p);
1.1 abaird 367: // Check for an existing server:
368: HttpServer server = (HttpServer) servers.get(id);
369: if ( server != null )
370: return server;
371: // Create and register a new server:
372: server = new HttpBasicServer();
1.9 abaird 373: server.initialize(this, new HttpServerState(server), host, p);
1.1 abaird 374: servers.put(id, server);
375: return server;
376: }
1.5 abaird 377:
1.1 abaird 378: /**
1.9 abaird 379: * The given connection is about to be used.
1.4 abaird 380: * Update our list of available servers.
1.9 abaird 381: * @param conn The idle connection.
1.4 abaird 382: */
383:
1.9 abaird 384: public void notifyUse(HttpConnection conn) {
385: connectionsLru.remove(conn);
1.4 abaird 386: }
387:
388: /**
1.9 abaird 389: * The given connection can be reused, but is now idle.
390: * @param conn The connection that is now idle.
1.4 abaird 391: */
392:
1.9 abaird 393: public void notifyIdle(HttpConnection conn) {
394: connectionsLru.toHead(conn);
1.4 abaird 395: }
396:
397: /**
1.9 abaird 398: * The given connection has just been created.
399: * @param conn The newly created connection.
400: */
401:
402: protected synchronized void notifyConnection(HttpConnection conn) {
403: if ( ++conn_count > conn_max )
404: closeAnyConnection();
405: }
406:
407: /**
408: * The given connection has been deleted.
409: * @param conn The deleted connection.
410: */
411:
412: protected void deleteConnection(HttpConnection conn) {
413: HttpServerState ss = conn.getServer().getState();
414: ss.deleteConnection(conn);
415: synchronized(this) {
416: --conn_count;
417: notifyAll();
418: }
419: }
420:
421: protected synchronized boolean tooManyConnections() {
422: return conn_count > conn_max;
423: }
424:
425: /**
426: * Try reusing one of the idle connection of that server, if any.
427: * @param server The target server.
428: * @return An currently idle connection to the given server.
1.4 abaird 429: */
430:
1.9 abaird 431: protected HttpConnection getConnection(HttpServer server) {
432: HttpServerState ss = server.getState();
433: return ss.getConnection();
434: }
435:
436: protected synchronized void waitForConnection(HttpServer server)
437: throws InterruptedException
438: {
439: wait();
1.4 abaird 440: }
441:
442: /**
1.9 abaird 443: * Close one connection, but pickling the least recently used one.
444: * @return A boolean, <strong>true</strong> if a connection was closed
445: * <strong>false</strong> otherwise.
1.4 abaird 446: */
447:
1.9 abaird 448: protected boolean closeAnyConnection() {
1.11 abaird 449: System.out.println("*** closeAnyConnection.");
1.9 abaird 450: HttpConnection conn = (HttpConnection) connectionsLru.removeTail();
451: if ( conn != null ) {
1.11 abaird 452: System.out.println("*** closeAnyConnection: closing "+conn);
1.9 abaird 453: conn.close();
454: deleteConnection(conn);
455: return true;
456: } else {
457: return false;
458: }
1.4 abaird 459: }
460:
461: /**
1.1 abaird 462: * One of our server handler wants to open a connection.
463: * @param block A boolean indicating whether we should block the calling
464: * thread until a token is available (otherwise, the method will just
465: * peek at the connection count, and return the appropriate result).
466: * @return A boolean, <strong>true</strong> if the connection can be
467: * opened straight, <strong>false</strong> otherwise.
468: */
469:
1.9 abaird 470: protected boolean negotiateConnection(HttpServer server) {
471: HttpServerState ss = server.getState();
1.10 abaird 472: if ( ! tooManyConnections() ) {
1.4 abaird 473: return true;
1.10 abaird 474: } else if ( ss.notEnoughConnections() ) {
475: return closeAnyConnection();
1.9 abaird 476: } else if ( servers.size() > conn_max ) {
477: return closeAnyConnection();
1.4 abaird 478: }
1.9 abaird 479: return false;
480: }
481:
482: /**
483: * A new client connection has been established.
484: * This method will try to maintain a maximum number of established
485: * connections, by closing idle connections when possible.
486: * @param server The server that has established a new connection.
487: */
488:
489: protected final synchronized void incrConnCount(HttpServer server) {
490: if ( ++conn_count > conn_max )
491: closeAnyConnection();
492: }
493:
494: /**
495: * Decrement the number of established connections.
496: * @param server The server that has closed one connection to its target.
497: */
498:
499: protected final synchronized void decrConnCount(HttpServer server) {
500: --conn_count;
1.1 abaird 501: }
502:
503: /**
504: * Run the given request, in synchronous mode.
505: * This method will launch the given request, and block the calling thread
506: * until the response headers are available.
507: * @param request The request to run.
508: * @return An instance of Reply, containing all the reply
509: * informations.
510: * @exception HTTPException If something failed during request processing.
511: */
512:
513: public Reply runRequest(Request request)
514: throws HttpException
515: {
516: URL target = request.getURL();
517: // Locate the appropriate target server:
1.5 abaird 518: HttpServer server = null;
519: URL proxy = request.getProxy();
520: if ( proxy != null ) {
521: server = lookupServer(proxy.getHost(), proxy.getPort());
522: } else {
523: server = lookupServer(target.getHost(), target.getPort());
524: }
1.1 abaird 525: // Now run through the ingoing filters:
526: RequestFilter filters[] = filteng.run(request);
527: if ( filters != null ) {
528: for (int i = 0 ; i < filters.length ; i++) {
1.3 abaird 529: Reply fr = filters[i].ingoingFilter(request);
530: if ( fr != null )
531: return fr;
1.1 abaird 532: }
533: }
534: // Get the server to give back a reply:
535: Reply reply = server.runRequest(request);
536: // Apply the filters on the way back:
537: if ( filters != null ) {
1.3 abaird 538: for (int i = 0 ; i < filters.length ; i++) {
539: Reply fr = filters[i].outgoingFilter(request, reply);
540: if ( fr != null )
541: return fr;
542: }
1.1 abaird 543: }
544: return reply;
545: }
546:
547: /**
548: * Get this manager's reply factory.
549: * The Reply factory is used when prsing incomming reply from servers, it
550: * decides what object will be created to hold the actual reply from the
551: * server.
552: * @return An object compatible with the MimeParserFactory interface.
553: */
554:
555: MimeParserFactory factory = null ;
556:
1.9 abaird 557: public MimeParserFactory getReplyFactory() {
1.1 abaird 558: return factory;
559: }
560:
561: /**
562: * Add a new request filter.
563: * Request filters are called <em>before</em> a request is launched, and
564: * <em>after</em> the reply headers are available. They allow applications
565: * to setup specific request headers (such as PICS, or PEP stuff) on the
566: * way in, and check the reply on the way out.
567: * <p>Request filters are application wide: if their scope matches
568: * the current request, then they will always be aplied.
569: * <p>Filter scopes are defined inclusively and exclusively
570: * @param filter The request filter to add.
571: */
572:
573: public void setFilter(URL incs[], URL exs[], RequestFilter filter) {
574: if ( incs != null ) {
575: for (int i = 0 ; i < incs.length ; i++)
576: filteng.setFilter(incs[i], true, filter);
577: }
578: if ( exs != null ) {
579: for (int i = 0 ; i < exs.length ; i++)
580: filteng.setFilter(exs[i], false, filter);
581: }
582: return;
583: }
584:
585: public void setFilter(RequestFilter filter) {
586: filteng.setFilter(filter);
587: }
588:
589: /**
590: * Add a request processor.
591: * Request processors are application wide hooks, able to answer request
592: * by querying a local cache. An application can set as many request
593: * processor as it wants, each of them will be called in trun (in the order
594: * they were registered), if any of them returns a reply, the request
595: * processing will be halted, and the generated reply returned.
596: * <p>Request processors can also be used to query distant cache, through
597: * some home-brew protocols.
598: * @param processor The request processor to be added.
599: */
600:
601: public void addProcessor(RequestProcessor processor) {
602: }
603:
604: /**
605: * Remove a request processor.
606: * Remove the given request processor.
607: * @return A boolean, <strong>true</strong> if the processor was found
608: * and removed, <strong>false</strong> otherwise.
609: */
610:
611: public boolean removeProcessor(RequestProcessor processor) {
612: return false;
613: }
614:
615: /**
616: * Create a new default outgoing request.
617: * This method should <em>always</em> be used to create outgoing requests.
618: * It will initialize the request with appropriate default values for
619: * the various headers, and make sure that the request is enhanced by
620: * the registered request filters.
621: * @return An instance of Request, suitable to be launched.
622: */
623:
624: public Request createRequest() {
625: return (Request) template.getClone() ;
626: }
627:
628: /**
629: * Global settings - Set the max number of allowed connections.
630: * Set the maximum number of simultaneous connections that can remain
631: * opened. The manager will take care of queuing requests if this number
632: * is reached.
633: * <p>This value defaults to the value of the
634: * <code>w3c.www.http.maxConnections</code> property.
635: * @param max_conn The allowed maximum simultaneous open connections.
636: */
637:
1.13 abaird 638: public synchronized void setMaxConnections(int max_conn) {
639: this.conn_max = max_conn;
1.1 abaird 640: }
641:
642: /**
643: * Global settings - Set an optional proxy to use.
644: * Set the proxy to which all requests should be targeted. If the
645: * <code>w3c.www.http.proxy</code> property is defined, it will be
646: * used as the default value.
647: * @param proxy The URL for the proxy to use.
648: */
649:
650: public void setProxy(URL proxy) {
1.5 abaird 651: template.setProxy(proxy);
1.1 abaird 652: }
653:
654: /**
655: * Global settings - Set the request timeout.
656: * Once a request has been emited, the HttpManager will sit for this
657: * given number of milliseconds before the request is declared to have
658: * timed-out.
659: * <p>This timeout value defaults to the value of the
660: * <code>w3c.www.http.requestTimeout</code> property value.
661: * @param ms The timeout value in milliseconds.
662: */
663:
664: public void setRequestTimeout(int ms) {
665: }
666:
667: /**
668: * Global settings - Define a global request header.
669: * Set a default value for some request header. Once defined, the
670: * header will automatically be defined on <em>all</em> outgoing requests
671: * created through the <code>createRequest</code> request.
672: * @param name The name of the header, case insensitive.
673: * @param value It's default value.
674: */
675:
676: public void setGlobalHeader(String name, String value) {
677: template.setValue(name, value);
678: }
679:
680: public String getGlobalHeader(String name) {
681: return template.getValue(name);
682: }
683:
684: /**
685: * Create a new HttpManager.
686: * This can only be called from this package. The caller must rather
687: * use the <code>getManager</code> method.
688: * @param props The properties from which the manager should initialize
689: * itself, or <strong>null</strong> if none are available.
690: */
691:
692: HttpManager(Properties props) {
1.9 abaird 693: this.template = new Request(this);
694: this.servers = new Hashtable();
695: this.filteng = new FilterEngine();
696: this.connectionsLru = new SyncLRUList();
1.1 abaird 697: }
698:
699: HttpManager() {
700: this(System.getProperties());
701: }
702:
703: /**
704: * DEBUGGING !
705: */
706:
707: public static void main(String args[]) {
708: try {
709: // Get the manager, and define some global headers:
710: HttpManager manager = HttpManager.getManager();
711: manager.setGlobalHeader("User-Agent", "Jigsaw/1.0a");
712: manager.setGlobalHeader("Accept", "*/*;q=1.0");
713: manager.setGlobalHeader("Accept-Encoding", "gzip");
714: Request request = manager.createRequest();
715: request.setURL(new URL(args[0]));
716: request.setMethod("GET");
717: Reply reply = manager.runRequest(request);
718: // Display some infos:
719: System.out.println("last-modified: "+reply.getLastModified());
720: System.out.println("length : "+reply.getContentLength());
721: // Display the returned body:
722: InputStream in = reply.getInputStream();
723: byte buf[] = new byte[4096];
724: int cnt = 0;
725: while ((cnt = in.read(buf)) > 0)
726: System.out.print(new String(buf, 0, 0, cnt));
727: System.out.println("-");
728: in.close();
729: } catch (Exception ex) {
730: ex.printStackTrace();
731: }
732: System.exit(1);
733: }
734: }
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