2 * Copyright (c) 2001-2007 Sun Microsystems, Inc. All rights reserved.
4 * The Sun Project JXTA(TM) Software License
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
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10 * this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright notice,
13 * this list of conditions and the following disclaimer in the documentation
14 * and/or other materials provided with the distribution.
16 * 3. The end-user documentation included with the redistribution, if any, must
17 * include the following acknowledgment: "This product includes software
18 * developed by Sun Microsystems, Inc. for JXTA(TM) technology."
19 * Alternately, this acknowledgment may appear in the software itself, if
20 * and wherever such third-party acknowledgments normally appear.
22 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
23 * not be used to endorse or promote products derived from this software
24 * without prior written permission. For written permission, please contact
25 * Project JXTA at http://www.jxta.org.
27 * 5. Products derived from this software may not be called "JXTA", nor may
28 * "JXTA" appear in their name, without prior written permission of Sun.
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31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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41 * JXTA is a registered trademark of Sun Microsystems, Inc. in the United
42 * States and other countries.
44 * Please see the license information page at :
45 * <http://www.jxta.org/project/www/license.html> for instructions on use of
46 * the license in source files.
48 * ====================================================================
50 * This software consists of voluntary contributions made by many individuals
51 * on behalf of Project JXTA. For more information on Project JXTA, please see
52 * http://www.jxta.org.
54 * This license is based on the BSD license adopted by the Apache Foundation.
57 package net.jxta.resolver;
60 import net.jxta.service.Service;
61 import net.jxta.protocol.ResolverQueryMsg;
62 import net.jxta.protocol.ResolverResponseMsg;
63 import net.jxta.protocol.ResolverSrdiMsg;
67 * Provides a generic mechanism for JXTA Services to send "Queries", and receive
68 * "Responses". It removes the burden for registered handlers in deal with :
71 * <li>Setting message tags, to ensure uniqueness of tags and
72 * ensures that messages are sent to the correct address, and group.</p>
73 * <li>Authentication, and verification of credentials.</p>
74 * <li>Query routing.</p>
75 * <li>drop rogue messages.</p>
78 * <p/>The ResolverService does not proccess the queries, nor does it not
79 * compose reponses. Processing of queries, and composition of responses is left
80 * up to the registered handlers. Services that wish to handle queries and
81 * generate reponses must implement {@link net.jxta.resolver.QueryHandler}.
83 * @see net.jxta.service.Service
84 * @see net.jxta.resolver.QueryHandler
85 * @see net.jxta.protocol.ResolverQueryMsg
86 * @see net.jxta.protocol.ResolverResponseMsg
88 public interface ResolverService extends Service, GenericResolver {
91 * Returned by query handlers to indicate that the query should be
92 * forwarded to the rest of the network.
94 public final static int Repropagate = -1;
97 * Returned by query handlers to indicate that the query has been resolved
98 * and a response has been sent.
100 public final static int OK = 0;
103 * Registers a given QueryHandler, returns the previous handler registered
106 * @param name The name under which this handler is to be registered.
107 * @param handler The handler.
108 * @return The previous handler registered under this name.
110 public QueryHandler registerHandler(String name, QueryHandler handler);
113 * Unregisters a given QueryHandler, returns the previous handler
114 * registered under this name.
116 * @param name The name of the handler to unregister.
117 * @return The previous handler registered under this name.
119 public QueryHandler unregisterHandler(String name);
122 * Registers a given SrdiHandler, returns the previous handler registered
125 * @param name The name under which this handler is to be registered.
126 * @param handler The handler.
127 * @return The previous handler registered under this name.
130 public SrdiHandler registerSrdiHandler(String name, SrdiHandler handler);
133 * Unregisters a given SrdiHandler, returns the previous handler registered
136 * @param name The name of the handler to unregister.
137 * @return The previous handler registered under this name
140 public SrdiHandler unregisterSrdiHandler(String name);
143 * Sends a resolver query. If <tt>destPeer</tt> is <tt>null</tt> the
144 * message is propagated.
146 * @param destPeer The destination peer of the query or <tt>null</tt> if
147 * the query is to be propagated.
148 * @param query The query to match.
150 public void sendQuery(String destPeer, ResolverQueryMsg query);
153 * Send a resolver response. If <tt>destPeer</tt> is <tt>null</tt> then the
154 * response is propagated. Propagated responses are generally announcements
155 * and not responses to active queries.
157 * @param destPeer The destination peer of the response or <tt>null</tt> if
158 * the response is to be propagated.
159 * @param response The response to be sent.
161 public void sendResponse(String destPeer, ResolverResponseMsg response);
164 * Send an SRDI message.
166 * <p/>If <tt>destPeer</tt> is <tt>null</tt> the message is walked.
168 * @param destPeer is the destination of the SRDI message.
169 * @param srdi is the SRDI message to be sent.
171 public void sendSrdi(String destPeer, ResolverSrdiMsg srdi);