1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27 package org.apache.hc.core5.http2.examples;
28
29 import java.util.List;
30 import java.util.concurrent.CountDownLatch;
31 import java.util.concurrent.Future;
32 import java.util.concurrent.TimeUnit;
33
34 import org.apache.hc.core5.concurrent.FutureCallback;
35 import org.apache.hc.core5.http.Header;
36 import org.apache.hc.core5.http.HttpConnection;
37 import org.apache.hc.core5.http.HttpHost;
38 import org.apache.hc.core5.http.HttpResponse;
39 import org.apache.hc.core5.http.Message;
40 import org.apache.hc.core5.http.impl.bootstrap.HttpAsyncRequester;
41 import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
42 import org.apache.hc.core5.http.nio.entity.StringAsyncEntityConsumer;
43 import org.apache.hc.core5.http.nio.support.AsyncRequestBuilder;
44 import org.apache.hc.core5.http.nio.support.BasicResponseConsumer;
45 import org.apache.hc.core5.http2.HttpVersionPolicy;
46 import org.apache.hc.core5.http2.config.H2Config;
47 import org.apache.hc.core5.http2.frame.RawFrame;
48 import org.apache.hc.core5.http2.impl.nio.H2StreamListener;
49 import org.apache.hc.core5.http2.impl.nio.bootstrap.H2RequesterBootstrap;
50 import org.apache.hc.core5.io.CloseMode;
51 import org.apache.hc.core5.reactor.IOReactorConfig;
52 import org.apache.hc.core5.util.Timeout;
53
54
55
56
57 public class H2MultiStreamExecutionExample {
58
59 public static void main(final String[] args) throws Exception {
60
61
62 final IOReactorConfig ioReactorConfig = IOReactorConfig.custom()
63 .setSoTimeout(5, TimeUnit.SECONDS)
64 .build();
65
66 final H2Config h2Config = H2Config.custom()
67 .setPushEnabled(false)
68 .setMaxConcurrentStreams(100)
69 .build();
70
71 final HttpAsyncRequester requester = H2RequesterBootstrap.bootstrap()
72 .setIOReactorConfig(ioReactorConfig)
73 .setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
74 .setH2Config(h2Config)
75 .setStreamListener(new H2StreamListener() {
76
77 @Override
78 public void onHeaderInput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
79 for (int i = 0; i < headers.size(); i++) {
80 System.out.println(connection.getRemoteAddress() + " (" + streamId + ") << " + headers.get(i));
81 }
82 }
83
84 @Override
85 public void onHeaderOutput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
86 for (int i = 0; i < headers.size(); i++) {
87 System.out.println(connection.getRemoteAddress() + " (" + streamId + ") >> " + headers.get(i));
88 }
89 }
90
91 @Override
92 public void onFrameInput(final HttpConnection connection, final int streamId, final RawFrame frame) {
93 }
94
95 @Override
96 public void onFrameOutput(final HttpConnection connection, final int streamId, final RawFrame frame) {
97 }
98
99 @Override
100 public void onInputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
101 }
102
103 @Override
104 public void onOutputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
105 }
106
107 })
108 .create();
109 Runtime.getRuntime().addShutdownHook(new Thread(() -> {
110 System.out.println("HTTP requester shutting down");
111 requester.close(CloseMode.GRACEFUL);
112 }));
113 requester.start();
114
115 final HttpHost target = new HttpHost("nghttp2.org");
116 final String[] requestUris = new String[] {"/httpbin/ip", "/httpbin/user-agent", "/httpbin/headers"};
117
118 final Future<AsyncClientEndpoint> future = requester.connect(target, Timeout.ofSeconds(5));
119 final AsyncClientEndpoint clientEndpoint = future.get();
120
121 final CountDownLatch latch = new CountDownLatch(requestUris.length);
122 for (final String requestUri: requestUris) {
123 clientEndpoint.execute(
124 AsyncRequestBuilder.get()
125 .setHttpHost(target)
126 .setPath(requestUri)
127 .build(),
128 new BasicResponseConsumer<>(new StringAsyncEntityConsumer()),
129 new FutureCallback<Message<HttpResponse, String>>() {
130
131 @Override
132 public void completed(final Message<HttpResponse, String> message) {
133 latch.countDown();
134 final HttpResponse response = message.getHead();
135 final String body = message.getBody();
136 System.out.println(requestUri + "->" + response.getCode());
137 System.out.println(body);
138 }
139
140 @Override
141 public void failed(final Exception ex) {
142 latch.countDown();
143 System.out.println(requestUri + "->" + ex);
144 }
145
146 @Override
147 public void cancelled() {
148 latch.countDown();
149 System.out.println(requestUri + " cancelled");
150 }
151
152 });
153 }
154
155 latch.await();
156
157
158 clientEndpoint.releaseAndDiscard();
159
160 System.out.println("Shutting down I/O reactor");
161 requester.initiateShutdown();
162 }
163
164 }