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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
33 import org.apache.hc.core5.concurrent.FutureCallback;
34 import org.apache.hc.core5.http.Header;
35 import org.apache.hc.core5.http.HttpConnection;
36 import org.apache.hc.core5.http.HttpHost;
37 import org.apache.hc.core5.http.HttpResponse;
38 import org.apache.hc.core5.http.Message;
39 import org.apache.hc.core5.http.Method;
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.BasicRequestProducer;
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.util.Timeout;
52
53
54
55
56 public class H2RequestExecutionExample {
57
58 public static void main(final String[] args) throws Exception {
59
60
61 final H2Config h2Config = H2Config.custom()
62 .setPushEnabled(false)
63 .build();
64
65 final HttpAsyncRequester requester = H2RequesterBootstrap.bootstrap()
66 .setH2Config(h2Config)
67 .setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
68 .setStreamListener(new H2StreamListener() {
69
70 @Override
71 public void onHeaderInput(final HttpConnection connection, final int streamId, final List<? extends Header> headers) {
72 for (int i = 0; i < headers.size(); i++) {
73 System.out.println(connection.getRemoteAddress() + " (" + streamId + ") << " + headers.get(i));
74 }
75 }
76
77 @Override
78 public void onHeaderOutput(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 onFrameInput(final HttpConnection connection, final int streamId, final RawFrame frame) {
86 }
87
88 @Override
89 public void onFrameOutput(final HttpConnection connection, final int streamId, final RawFrame frame) {
90 }
91
92 @Override
93 public void onInputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
94 }
95
96 @Override
97 public void onOutputFlowControl(final HttpConnection connection, final int streamId, final int delta, final int actualSize) {
98 }
99
100 })
101 .create();
102 Runtime.getRuntime().addShutdownHook(new Thread() {
103 @Override
104 public void run() {
105 System.out.println("HTTP requester shutting down");
106 requester.close(CloseMode.GRACEFUL);
107 }
108 });
109 requester.start();
110
111 final HttpHost target = new HttpHost("nghttp2.org");
112 final String[] requestUris = new String[] {"/httpbin/ip", "/httpbin/user-agent", "/httpbin/headers"};
113
114 final CountDownLatch latch = new CountDownLatch(requestUris.length);
115 for (final String requestUri: requestUris) {
116 final Future<AsyncClientEndpoint> future = requester.connect(target, Timeout.ofSeconds(5));
117 final AsyncClientEndpoint clientEndpoint = future.get();
118 clientEndpoint.execute(
119 new BasicRequestProducer(Method.GET, target, requestUri),
120 new BasicResponseConsumer<>(new StringAsyncEntityConsumer()),
121 new FutureCallback<Message<HttpResponse, String>>() {
122
123 @Override
124 public void completed(final Message<HttpResponse, String> message) {
125 clientEndpoint.releaseAndReuse();
126 final HttpResponse response = message.getHead();
127 final String body = message.getBody();
128 System.out.println(requestUri + "->" + response.getCode());
129 System.out.println(body);
130 latch.countDown();
131 }
132
133 @Override
134 public void failed(final Exception ex) {
135 clientEndpoint.releaseAndDiscard();
136 System.out.println(requestUri + "->" + ex);
137 latch.countDown();
138 }
139
140 @Override
141 public void cancelled() {
142 clientEndpoint.releaseAndDiscard();
143 System.out.println(requestUri + " cancelled");
144 latch.countDown();
145 }
146
147 });
148 }
149
150 latch.await();
151 System.out.println("Shutting down I/O reactor");
152 requester.initiateShutdown();
153 }
154
155 }