1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19 package org.eclipse.jetty.client;
20
21 import java.net.InetSocketAddress;
22 import java.util.Map;
23
24 import org.eclipse.jetty.io.ClientConnectionFactory;
25
26 /**
27 * {@link HttpClientTransport} represents what transport implementations should provide
28 * in order to plug-in a different transport for {@link HttpClient}.
29 * <p>
30 * While the {@link HttpClient} APIs define the HTTP semantic (request, response, headers, etc.)
31 * <em>how</em> a HTTP exchange is carried over the network depends on implementations of this class.
32 * <p>
33 * The default implementation uses the HTTP protocol to carry over the network the HTTP exchange,
34 * but the HTTP exchange may also be carried using the FCGI protocol, the HTTP/2 protocol or,
35 * in future, other protocols.
36 */
37 public interface HttpClientTransport extends ClientConnectionFactory
38 {
39 public static final String HTTP_DESTINATION_CONTEXT_KEY = "http.destination";
40 public static final String HTTP_CONNECTION_PROMISE_CONTEXT_KEY = "http.connection.promise";
41
42 /**
43 * Sets the {@link HttpClient} instance on this transport.
44 * <p>
45 * This is needed because of a chicken-egg problem: in order to create the {@link HttpClient}
46 * a {@link HttpClientTransport} is needed, that therefore cannot have a reference yet to the
47 * {@link HttpClient}.
48 *
49 * @param client the {@link HttpClient} that uses this transport.
50 */
51 public void setHttpClient(HttpClient client);
52
53 /**
54 * Creates a new, transport-specific, {@link HttpDestination} object.
55 * <p>
56 * {@link HttpDestination} controls the destination-connection cardinality: protocols like
57 * HTTP have 1-N cardinality, while multiplexed protocols like HTTP/2 have a 1-1 cardinality.
58 *
59 * @param origin the destination origin
60 * @return a new, transport-specific, {@link HttpDestination} object
61 */
62 public HttpDestination newHttpDestination(Origin origin);
63
64 /**
65 * Establishes a physical connection to the given {@code address}.
66 *
67 * @param address the address to connect to
68 * @param context the context information to establish the connection
69 */
70 public void connect(InetSocketAddress address, Map<String, Object> context);
71 }