Annotation of java/classes/org/w3c/www/protocol/http/HttpManager.java, revision 1.30
1.1 abaird 1: // HttpManager.java
1.30 ! abaird 2: // $Id: HttpManager.java,v 1.29 1997/01/28 16:44:33 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:
1.25 abaird 15: class ManagerDescription {
16: HttpManager manager = null;
17: Properties properties = null;
18:
19: final HttpManager getManager() {
20: return manager;
21: }
22:
23: final boolean sameProperties(Properties props) {
24: return props == properties;
25: }
26:
27: ManagerDescription(HttpManager manager, Properties props) {
28: this.manager = manager;
29: this.properties = props;
30: }
31: }
32:
1.1 abaird 33: class ReplyFactory implements MimeParserFactory {
34:
35: public MimeHeaderHolder createHeaderHolder(MimeParser parser) {
36: return new Reply(parser);
37: }
38:
39: }
40:
41: /**
42: * The client side HTTP request manager.
43: * This class is the user interface (along with the other public classes of
44: * this package) for the W3C client side library implementing HTTP.
45: * A typicall request is launched though the following sequence:
46: * <pre>
47: * HttpManager manager = HttpManager.getManager() ;
48: * Request request = manager.makeRequest() ;
49: * request.setMethod(HTTP.GET) ;
50: * request.setURL(new URL("http://www.w3.org/pub/WWW/"));
51: * Reply reply = manager.runRequest(request) ;
52: * // Get the reply input stream that contains the actual data:
53: * InputStream in = reply.getInputStream() ;
54: * ...
55: * </pre>
56: */
57:
1.13 abaird 58: public class HttpManager implements PropertyMonitoring {
1.17 abaird 59: private static final
60: String DEFAULT_SERVER_CLASS = "w3c.www.protocol.http.HttpBasicServer";
61:
62: /**
63: * The name of the property indicating the class of HttpServer to use.
64: */
65: public static final
66: String SERVER_CLASS_P = "w3c.www.protocol.http.server";
67:
1.2 abaird 68: /**
69: * The name of the property containing the ProprequestFilter to launch.
70: */
1.12 abaird 71: public static final
72: String FILTERS_PROP_P = "w3c.www.protocol.http.filters";
1.5 abaird 73: /**
1.11 abaird 74: * The maximum number of simultaneous connections.
75: */
76: public static final
1.12 abaird 77: String CONN_MAX_P = "w3c.www.protocol.http.connections.max";
1.11 abaird 78: /**
1.5 abaird 79: * Header properties - The allowed drift for getting cached resources.
80: */
81: public static final
1.12 abaird 82: String MAX_STALE_P = "w3c.www.protocol.http.cacheControl.maxStale";
1.5 abaird 83: /**
84: * Header properties - The minium freshness required on cached resources.
85: */
86: public static final
1.12 abaird 87: String MIN_FRESH_P = "w3c.www.protocol.http.cacheControl.minFresh";
1.5 abaird 88: /**
89: * Header properties - Set the only if cached flag on requests.
90: */
91: public static final
1.12 abaird 92: String ONLY_IF_CACHED_P="w3c.www.protocol.http.cacheControl.onlyIfCached";
1.5 abaird 93: /**
94: * Header properties - Set the user agent.
95: */
96: public static final
1.12 abaird 97: String USER_AGENT_P = "w3c.www.protocol.http.userAgent";
1.5 abaird 98: /**
99: * Header properties - Set the accept header.
100: */
101: public static final
1.12 abaird 102: String ACCEPT_P = "w3c.www.protocol.http.accept";
1.5 abaird 103: /**
104: * Header properties - Set the accept language.
105: */
106: public static final
1.12 abaird 107: String ACCEPT_LANGUAGE_P = "w3c.www.protocol.http.acceptLanguage";
1.5 abaird 108: /**
109: * Header properties - Set the accept encodings.
110: */
111: public static final
1.12 abaird 112: String ACCEPT_ENCODING_P = "w3c.www.protocol.http.acceptEncoding";
1.5 abaird 113: /**
114: * Header properties - Should we use a proxy ?
115: */
116: public static final
1.12 abaird 117: String PROXY_SET_P = "proxySet";
1.5 abaird 118: /**
119: * Header properties - What is the proxy host name.
120: */
121: public static final
1.12 abaird 122: String PROXY_HOST_P = "proxyHost";
1.5 abaird 123: /**
124: * Header properties - What is the proxy port number.
125: */
126: public static final
1.12 abaird 127: String PROXY_PORT_P = "proxyPort";
1.2 abaird 128:
1.7 abaird 129: /**
130: * The default value for the <code>Accept</code> header.
131: */
132: public static final
133: String DEFAULT_ACCEPT = "*/*";
134: /**
135: * The default value for the <code>User-Agent</code> header.
136: */
137: public static final
1.29 abaird 138: String DEFAULT_USER_AGENT = "Jigsaw/1.0a5";
1.7 abaird 139:
1.24 abaird 140: /**
141: * This array keeps track of all the created managers.
142: * A new manager (kind of HTTP client side context) is created for each
143: * diffferent set of properties.
144: */
1.25 abaird 145: private static ManagerDescription managers[] = new ManagerDescription[4];
1.1 abaird 146:
147: /**
1.17 abaird 148: * The class to instantiate to create new HttpServer instances.
149: */
150: protected Class serverclass = null;
151: /**
1.13 abaird 152: * The properties we initialized from.
153: */
154: ObservableProperties props = null;
155: /**
1.1 abaird 156: * The server this manager knows about, indexed by FQDN of target servers.
157: */
158: protected Hashtable servers = null;
159: /**
160: * The template request (the request we will clone to create new requests)
161: */
1.4 abaird 162: protected Request template = null ;
163: /**
1.9 abaird 164: * The LRU list of connections.
1.4 abaird 165: */
1.9 abaird 166: protected LRUList connectionsLru = null;
1.1 abaird 167: /**
168: * The filter engine attached to this manager.
169: */
170: FilterEngine filteng = null;
171:
1.9 abaird 172: protected int conn_count = 0;
173: protected int conn_max = 5;
174:
1.1 abaird 175: /**
1.13 abaird 176: * Update the proxy configuration to match current properties setting.
177: * @return A boolean, <strong>true</strong> if change was done,
178: * <strong>false</strong> otherwise.
179: */
180:
181: protected boolean updateProxy() {
182: boolean set = props.getBoolean(PROXY_SET_P, false);
183: if ( set ) {
184: // Wow using a proxy now !
185: String host = props.getString(PROXY_HOST_P, null);
186: int port = props.getInteger(PROXY_PORT_P, -1);
187: URL proxy = null;
188: try {
189: proxy = new URL("http", host, port, "/");
190: } catch (Exception ex) {
191: return false;
192: }
193: // Now if a proxy...
194: if ( proxy != null )
1.24 abaird 195: template.setProxy(proxy);
1.13 abaird 196: } else {
1.24 abaird 197: template.setProxy(null);
1.13 abaird 198: }
199: return true;
200: }
201:
202: /**
1.24 abaird 203: * Get this manager properties.
204: * @return An ObservableProperties instance.
205: */
206:
207: public final ObservableProperties getProperties() {
208: return props;
209: }
210:
211: /**
1.13 abaird 212: * PropertyMonitoring implementation - Update properties on the fly !
213: * @param name The name of the property that has changed.
214: * @return A boolean, <strong>true</strong> if change is accepted,
215: * <strong>false</strong> otherwise.
216: */
217:
218: public boolean propertyChanged(String name) {
1.24 abaird 219: Request tpl = template;
1.13 abaird 220: if ( name.equals(FILTERS_PROP_P) ) {
221: return false;
222: } else if ( name.equals(CONN_MAX_P) ) {
223: setMaxConnections(props.getInteger(CONN_MAX_P, conn_max));
224: return true;
225: } else if ( name.equals(MAX_STALE_P) ) {
226: int ival = props.getInteger(MAX_STALE_P, -1);
227: if ( ival >= 0 )
228: tpl.setMaxStale(ival);
229: return true;
230: } else if ( name.equals(MIN_FRESH_P) ) {
231: int ival = props.getInteger(MIN_FRESH_P, -1);
232: if ( ival >= 0 )
233: tpl.setMinFresh(ival);
234: return true;
235: } else if ( name.equals(ONLY_IF_CACHED_P) ) {
236: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
237: return true;
238: } else if ( name.equals(USER_AGENT_P) ) {
239: tpl.setValue("user-agent"
240: , props.getString(USER_AGENT_P
241: , DEFAULT_USER_AGENT));
242: return true;
243: } else if ( name.equals(ACCEPT_P) ) {
244: tpl.setValue("accept"
245: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
246: return true;
247: } else if ( name.equals(ACCEPT_LANGUAGE_P) ) {
248: String sval = props.getString(ACCEPT_LANGUAGE_P, null);
249: if ( sval != null )
250: tpl.setValue("accept-language", sval);
251: return true;
252: } else if ( name.equals(ACCEPT_ENCODING_P) ) {
253: String sval = props.getString(ACCEPT_ENCODING_P, null);
254: if ( sval != null )
255: tpl.setValue("accept-encoding", sval);
256: return true;
257: } else if ( name.equals(PROXY_SET_P)
258: || name.equals(PROXY_HOST_P)
259: || name.equals(PROXY_PORT_P) ) {
260: return updateProxy();
261: } else {
262: return true;
263: }
264: }
265:
266: /**
1.4 abaird 267: * Allow the manager to interact with the user if needed.
268: * This will, for example, allow prompting for paswords, etc.
269: * @param onoff Turn interaction on or off.
270: */
271:
272: public void setAllowUserInteraction(boolean onoff) {
273: template.setAllowUserInteraction(onoff);
274: }
275:
276: /**
1.1 abaird 277: * Get an instance of the HTTP manager.
278: * This method returns an actual instance of the HTTP manager. It may
279: * return different managers, if it decides to distribute the load on
280: * different managers (avoid the HttpManager being a bottleneck).
281: * @return An application wide instance of the HTTP manager.
282: */
283:
1.24 abaird 284: public static synchronized HttpManager getManager(Properties p) {
285: // Does such a manager exists already ?
286: for (int i = 0 ; i < managers.length ; i++) {
287: if ( managers[i] == null )
288: continue;
1.25 abaird 289: if ( managers[i].sameProperties(p) ) {
290: return managers[i].getManager();
1.24 abaird 291: }
292: }
293: // Get the props we will initialize from:
1.28 abaird 294: ObservableProperties props = null;
1.24 abaird 295: if ( p instanceof ObservableProperties )
1.28 abaird 296: props = (ObservableProperties) p;
1.24 abaird 297: else
1.28 abaird 298: props = new ObservableProperties(p);
299: // Create a new manager for this set of properties:
300: HttpManager manager = new HttpManager() ;
301: manager.props = props;
1.24 abaird 302: // Initialize this new manager filters:
303: String filters[] = props.getStringArray(FILTERS_PROP_P, null);
304: if ( filters != null ) {
305: for (int i = 0 ; i < filters.length ; i++) {
306: try {
307: Class c = Class.forName(filters[i]);
308: PropRequestFilter f = null;
309: f = (PropRequestFilter) c.newInstance();
310: f.initialize(manager);
311: } catch (PropRequestFilterException ex) {
312: System.out.println("Couldn't initialize filter \""
313: + filters[i]
314: + "\" init failed: "
315: + ex.getMessage());
316: } catch (Exception ex) {
317: System.err.println("Error initializing prop filters:");
318: System.err.println("Coulnd't initialize ["
319: + filters[i]
320: + "]: " + ex.getMessage());
321: ex.printStackTrace();
322: System.exit(1);
1.2 abaird 323: }
324: }
1.24 abaird 325: }
326: // The factory to create MIME reply holders:
327: manager.factory = new ReplyFactory();
328: // The class to create HttpServer instances from
329: String c = props.getString(SERVER_CLASS_P, DEFAULT_SERVER_CLASS);
330: try {
331: manager.serverclass = Class.forName(c);
332: } catch (Exception ex) {
333: System.err.println("Unable to initialize HttpManager: ");
334: System.err.println("Class \""+c+"\" not found, from property "
335: + SERVER_CLASS_P);
336: ex.printStackTrace();
337: System.exit(1);
338: }
339: // Setup the template request:
340: Request tpl = manager.template;
341: // Set some default headers value (from props)
342: // Check for a proxy ?
343: manager.updateProxy();
344: // CacheControl, only-if-cached
345: tpl.setOnlyIfCached(props.getBoolean(ONLY_IF_CACHED_P, false));
346: // CacheControl, maxstale
347: int ival = props.getInteger(MAX_STALE_P, -1);
348: if ( ival >= 0 )
349: tpl.setMaxStale(ival);
350: // CacheControl, minfresh:
351: ival = props.getInteger(MIN_FRESH_P, -1);
352: if ( ival >= 0 )
353: tpl.setMinFresh(ival);
354: // General, User agent
355: tpl.setValue("user-agent"
356: , props.getString(USER_AGENT_P
357: , DEFAULT_USER_AGENT));
358: // General, Accept
359: tpl.setValue("accept"
360: , props.getString(ACCEPT_P, DEFAULT_ACCEPT));
361: // General, Accept-Language
362: String sval = props.getString(ACCEPT_LANGUAGE_P, null);
363: if ( sval != null )
364: tpl.setValue("accept-language", sval);
365: // General, Accept-Encoding
366: sval = props.getString(ACCEPT_ENCODING_P, null);
367: if ( sval != null )
368: tpl.setValue("accept-encoding", sval);
369: // Maximum number of allowed connections:
370: manager.conn_max = props.getInteger(CONN_MAX_P, 5);
371: // Register ourself as a property observer:
372: props.registerObserver(manager);
373: // Register that manager in our knwon managers:
374: for (int i = 0 ; i < managers.length ; i++) {
375: if ( managers[i] == null ) {
1.25 abaird 376: managers[i] = new ManagerDescription(manager, p);
1.24 abaird 377: return manager;
1.17 abaird 378: }
1.1 abaird 379: }
1.25 abaird 380: ManagerDescription nm[] = new ManagerDescription[managers.length << 1];
381: System.arraycopy(managers, 0, nm, 0, managers.length);
382: nm[managers.length] = new ManagerDescription(manager, p);
383: managers = nm;
1.1 abaird 384: return manager;
385: }
386:
1.24 abaird 387: public static HttpManager getManager() {
388: return getManager(System.getProperties());
389: }
1.1 abaird 390:
391: /**
392: * Get the appropriate server object for handling request to given target.
393: * @param key The server's identifier encoded as a <code>host:port</code>
394: * String.
395: * @return An object complying to the HttpServer interface.
396: * @exception HttpException If the given host name couldn't be resolved.
397: */
398:
1.5 abaird 399: protected synchronized HttpServer lookupServer(String host, int port)
1.1 abaird 400: throws HttpException
401: {
1.5 abaird 402: int p = (port == -1) ? 80 : port;
403: String id = (p == 80) ? host : (host +":"+p);
1.1 abaird 404: // Check for an existing server:
405: HttpServer server = (HttpServer) servers.get(id);
406: if ( server != null )
407: return server;
408: // Create and register a new server:
1.17 abaird 409: try {
410: server = (HttpServer) serverclass.newInstance();
411: } catch (Exception ex) {
412: String msg = ("Unable to create an instance of \""
413: + serverclass.getName()
414: + "\", invalid config, check the "
415: + SERVER_CLASS_P + " property.");
1.21 abaird 416: throw new HttpException(ex, msg);
1.17 abaird 417: }
1.9 abaird 418: server.initialize(this, new HttpServerState(server), host, p);
1.1 abaird 419: servers.put(id, server);
420: return server;
421: }
1.5 abaird 422:
1.1 abaird 423: /**
1.9 abaird 424: * The given connection is about to be used.
1.4 abaird 425: * Update our list of available servers.
1.9 abaird 426: * @param conn The idle connection.
1.4 abaird 427: */
428:
1.9 abaird 429: public void notifyUse(HttpConnection conn) {
430: connectionsLru.remove(conn);
1.4 abaird 431: }
432:
433: /**
1.9 abaird 434: * The given connection can be reused, but is now idle.
435: * @param conn The connection that is now idle.
1.4 abaird 436: */
437:
1.9 abaird 438: public void notifyIdle(HttpConnection conn) {
439: connectionsLru.toHead(conn);
1.4 abaird 440: }
441:
442: /**
1.9 abaird 443: * The given connection has just been created.
444: * @param conn The newly created connection.
445: */
446:
447: protected synchronized void notifyConnection(HttpConnection conn) {
448: if ( ++conn_count > conn_max )
449: closeAnyConnection();
450: }
451:
452: /**
453: * The given connection has been deleted.
454: * @param conn The deleted connection.
455: */
456:
457: protected void deleteConnection(HttpConnection conn) {
458: HttpServerState ss = conn.getServer().getState();
459: ss.deleteConnection(conn);
460: synchronized(this) {
461: --conn_count;
462: notifyAll();
463: }
464: }
465:
466: protected synchronized boolean tooManyConnections() {
467: return conn_count > conn_max;
468: }
469:
470: /**
471: * Try reusing one of the idle connection of that server, if any.
472: * @param server The target server.
473: * @return An currently idle connection to the given server.
1.4 abaird 474: */
475:
1.9 abaird 476: protected HttpConnection getConnection(HttpServer server) {
477: HttpServerState ss = server.getState();
478: return ss.getConnection();
479: }
480:
481: protected synchronized void waitForConnection(HttpServer server)
482: throws InterruptedException
483: {
484: wait();
1.4 abaird 485: }
486:
487: /**
1.9 abaird 488: * Close one connection, but pickling the least recently used one.
489: * @return A boolean, <strong>true</strong> if a connection was closed
490: * <strong>false</strong> otherwise.
1.4 abaird 491: */
492:
1.9 abaird 493: protected boolean closeAnyConnection() {
494: HttpConnection conn = (HttpConnection) connectionsLru.removeTail();
495: if ( conn != null ) {
496: conn.close();
497: deleteConnection(conn);
498: return true;
499: } else {
500: return false;
501: }
1.4 abaird 502: }
503:
504: /**
1.1 abaird 505: * One of our server handler wants to open a connection.
506: * @param block A boolean indicating whether we should block the calling
507: * thread until a token is available (otherwise, the method will just
508: * peek at the connection count, and return the appropriate result).
509: * @return A boolean, <strong>true</strong> if the connection can be
510: * opened straight, <strong>false</strong> otherwise.
511: */
512:
1.9 abaird 513: protected boolean negotiateConnection(HttpServer server) {
514: HttpServerState ss = server.getState();
1.10 abaird 515: if ( ! tooManyConnections() ) {
1.4 abaird 516: return true;
1.10 abaird 517: } else if ( ss.notEnoughConnections() ) {
518: return closeAnyConnection();
1.9 abaird 519: } else if ( servers.size() > conn_max ) {
520: return closeAnyConnection();
1.4 abaird 521: }
1.9 abaird 522: return false;
523: }
524:
525: /**
526: * A new client connection has been established.
527: * This method will try to maintain a maximum number of established
528: * connections, by closing idle connections when possible.
529: * @param server The server that has established a new connection.
530: */
531:
532: protected final synchronized void incrConnCount(HttpServer server) {
533: if ( ++conn_count > conn_max )
534: closeAnyConnection();
535: }
536:
537: /**
538: * Decrement the number of established connections.
539: * @param server The server that has closed one connection to its target.
540: */
541:
542: protected final synchronized void decrConnCount(HttpServer server) {
543: --conn_count;
1.1 abaird 544: }
545:
546: /**
547: * Run the given request, in synchronous mode.
548: * This method will launch the given request, and block the calling thread
549: * until the response headers are available.
550: * @param request The request to run.
551: * @return An instance of Reply, containing all the reply
552: * informations.
553: * @exception HTTPException If something failed during request processing.
554: */
555:
556: public Reply runRequest(Request request)
557: throws HttpException
558: {
1.19 abaird 559: URL target = request.getURL();
560: Reply reply = null;
561: int fcalls = 0;
1.1 abaird 562: // Now run through the ingoing filters:
563: RequestFilter filters[] = filteng.run(request);
564: if ( filters != null ) {
565: for (int i = 0 ; i < filters.length ; i++) {
1.19 abaird 566: if ((reply = filters[fcalls].ingoingFilter(request)) != null)
567: break;
568: fcalls++;
1.1 abaird 569: }
570: }
1.16 abaird 571: // Locate the appropriate target server:
1.19 abaird 572: if ( reply == null ) {
1.21 abaird 573: HttpServer srv = null;
1.22 ylafon 574: URL proxy;
575: boolean rtry ;
1.21 abaird 576: do {
1.22 ylafon 577: rtry = false;
1.21 abaird 578: try {
1.22 ylafon 579: proxy = request.getProxy();
1.21 abaird 580: srv = ((proxy != null)
581: ? lookupServer(proxy.getHost(), proxy.getPort())
582: : lookupServer(target.getHost(), target.getPort()));
1.30 ! abaird 583: request.setServer(srv);
1.21 abaird 584: reply = srv.runRequest(request);
585: } catch (HttpException ex) {
586: for (int i = 0; i < fcalls; i++)
587: rtry = rtry || filters[i].exceptionFilter(request, ex);
1.23 abaird 588: if ( ! rtry )
1.22 ylafon 589: throw ex;
1.30 ! abaird 590: } finally {
! 591: request.unsetServer();
1.21 abaird 592: }
593: } while (rtry);
1.16 abaird 594: }
1.1 abaird 595: // Apply the filters on the way back:
596: if ( filters != null ) {
1.19 abaird 597: while (--fcalls >= 0) {
598: Reply frep = filters[fcalls].outgoingFilter(request, reply);
599: if ( frep != null ) {
600: reply = frep;
601: break;
602: }
1.3 abaird 603: }
1.1 abaird 604: }
605: return reply;
606: }
607:
608: /**
609: * Get this manager's reply factory.
610: * The Reply factory is used when prsing incomming reply from servers, it
611: * decides what object will be created to hold the actual reply from the
612: * server.
613: * @return An object compatible with the MimeParserFactory interface.
614: */
615:
616: MimeParserFactory factory = null ;
617:
1.9 abaird 618: public MimeParserFactory getReplyFactory() {
1.1 abaird 619: return factory;
620: }
621:
622: /**
623: * Add a new request filter.
624: * Request filters are called <em>before</em> a request is launched, and
625: * <em>after</em> the reply headers are available. They allow applications
626: * to setup specific request headers (such as PICS, or PEP stuff) on the
627: * way in, and check the reply on the way out.
628: * <p>Request filters are application wide: if their scope matches
629: * the current request, then they will always be aplied.
630: * <p>Filter scopes are defined inclusively and exclusively
1.15 abaird 631: * @param incs The URL domains for which the filter should be triggered.
632: * @param exs The URL domains for which the filter should not be triggered.
1.1 abaird 633: * @param filter The request filter to add.
634: */
635:
636: public void setFilter(URL incs[], URL exs[], RequestFilter filter) {
637: if ( incs != null ) {
638: for (int i = 0 ; i < incs.length ; i++)
639: filteng.setFilter(incs[i], true, filter);
640: }
641: if ( exs != null ) {
642: for (int i = 0 ; i < exs.length ; i++)
643: filteng.setFilter(exs[i], false, filter);
644: }
645: return;
646: }
647:
1.15 abaird 648: /**
649: * Add a global filter.
650: * The given filter will <em>always</em> be invoked.
651: * @param filter The filter to install.
652: */
653:
1.1 abaird 654: public void setFilter(RequestFilter filter) {
655: filteng.setFilter(filter);
656: }
657:
658: /**
1.15 abaird 659: * Find back an instance of a global filter.
660: * This methods allow external classes to get a pointer to installed
661: * filters of a given class.
662: * @param cls The class of the filter to look for.
663: * @return A RequestFilter instance, or <strong>null</strong> if not
664: * found.
1.1 abaird 665: */
666:
1.15 abaird 667: public RequestFilter getGlobalFilter(Class cls) {
668: return filteng.getGlobalFilter(cls);
1.1 abaird 669: }
670:
671: /**
672: * Create a new default outgoing request.
673: * This method should <em>always</em> be used to create outgoing requests.
674: * It will initialize the request with appropriate default values for
675: * the various headers, and make sure that the request is enhanced by
676: * the registered request filters.
677: * @return An instance of Request, suitable to be launched.
678: */
679:
680: public Request createRequest() {
681: return (Request) template.getClone() ;
682: }
683:
684: /**
685: * Global settings - Set the max number of allowed connections.
686: * Set the maximum number of simultaneous connections that can remain
687: * opened. The manager will take care of queuing requests if this number
688: * is reached.
689: * <p>This value defaults to the value of the
690: * <code>w3c.www.http.maxConnections</code> property.
691: * @param max_conn The allowed maximum simultaneous open connections.
692: */
693:
1.13 abaird 694: public synchronized void setMaxConnections(int max_conn) {
695: this.conn_max = max_conn;
1.1 abaird 696: }
697:
698: /**
699: * Global settings - Set an optional proxy to use.
700: * Set the proxy to which all requests should be targeted. If the
701: * <code>w3c.www.http.proxy</code> property is defined, it will be
702: * used as the default value.
703: * @param proxy The URL for the proxy to use.
704: */
705:
706: public void setProxy(URL proxy) {
1.5 abaird 707: template.setProxy(proxy);
1.30 ! abaird 708: }
! 709:
! 710: /**
! 711: * Does this manager uses a proxy to fulfill requests ?
! 712: * @return A boolean.
! 713: */
! 714:
! 715: public boolean usingProxy() {
! 716: return template.hasProxy();
1.1 abaird 717: }
718:
719: /**
720: * Global settings - Set the request timeout.
721: * Once a request has been emited, the HttpManager will sit for this
722: * given number of milliseconds before the request is declared to have
723: * timed-out.
724: * <p>This timeout value defaults to the value of the
725: * <code>w3c.www.http.requestTimeout</code> property value.
726: * @param ms The timeout value in milliseconds.
727: */
728:
729: public void setRequestTimeout(int ms) {
730: }
731:
732: /**
733: * Global settings - Define a global request header.
734: * Set a default value for some request header. Once defined, the
735: * header will automatically be defined on <em>all</em> outgoing requests
736: * created through the <code>createRequest</code> request.
737: * @param name The name of the header, case insensitive.
738: * @param value It's default value.
739: */
740:
741: public void setGlobalHeader(String name, String value) {
742: template.setValue(name, value);
743: }
744:
1.18 abaird 745: /**
746: * Global settings - Get a global request header default value.
747: * @param name The name of the header to get.
748: * @return The value for that header, as a String, or <strong>
749: * null</strong> if undefined.
750: */
751:
1.1 abaird 752: public String getGlobalHeader(String name) {
753: return template.getValue(name);
1.18 abaird 754: }
755:
756:
757: /**
758: * Dump all in-memory cached state to persistent storage.
759: */
760:
761: public void sync() {
762: filteng.sync();
1.1 abaird 763: }
764:
765: /**
766: * Create a new HttpManager.
767: * This can only be called from this package. The caller must rather
768: * use the <code>getManager</code> method.
769: * @param props The properties from which the manager should initialize
770: * itself, or <strong>null</strong> if none are available.
771: */
772:
1.28 abaird 773: HttpManager() {
1.9 abaird 774: this.template = new Request(this);
775: this.servers = new Hashtable();
776: this.filteng = new FilterEngine();
777: this.connectionsLru = new SyncLRUList();
1.1 abaird 778: }
779:
780: /**
781: * DEBUGGING !
782: */
783:
784: public static void main(String args[]) {
785: try {
786: // Get the manager, and define some global headers:
787: HttpManager manager = HttpManager.getManager();
788: manager.setGlobalHeader("User-Agent", "Jigsaw/1.0a");
789: manager.setGlobalHeader("Accept", "*/*;q=1.0");
790: manager.setGlobalHeader("Accept-Encoding", "gzip");
791: Request request = manager.createRequest();
792: request.setURL(new URL(args[0]));
793: request.setMethod("GET");
794: Reply reply = manager.runRequest(request);
795: // Display some infos:
796: System.out.println("last-modified: "+reply.getLastModified());
797: System.out.println("length : "+reply.getContentLength());
798: // Display the returned body:
799: InputStream in = reply.getInputStream();
800: byte buf[] = new byte[4096];
801: int cnt = 0;
802: while ((cnt = in.read(buf)) > 0)
803: System.out.print(new String(buf, 0, 0, cnt));
804: System.out.println("-");
805: in.close();
806: } catch (Exception ex) {
807: ex.printStackTrace();
808: }
809: System.exit(1);
810: }
811: }
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