httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientH2Multiplexing.java

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
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package org.apache.hc.client5.http.examples;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
import org.apache.hc.client5.http.async.methods.SimpleHttpRequests;
import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
import org.apache.hc.client5.http.async.methods.SimpleRequestProducer;
import org.apache.hc.client5.http.async.methods.SimpleResponseConsumer;
import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
import org.apache.hc.client5.http.impl.async.MinimalHttpAsyncClient;
import org.apache.hc.core5.concurrent.FutureCallback;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.nio.AsyncClientEndpoint;
import org.apache.hc.core5.http2.HttpVersionPolicy;
import org.apache.hc.core5.http2.config.H2Config;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.reactor.IOReactorConfig;
import org.apache.hc.core5.util.Timeout;

/**
 * This example demonstrates concurrent (multiplexed) execution of multiple
 * HTTP/2 message exchanges.
 */
public class AsyncClientH2Multiplexing {

    public static void main(final String[] args) throws Exception {

        final IOReactorConfig ioReactorConfig = IOReactorConfig.custom()
                .setSoTimeout(Timeout.ofSeconds(5))
                .build();

        final MinimalHttpAsyncClient client = HttpAsyncClients.createMinimal(
                HttpVersionPolicy.FORCE_HTTP_2, H2Config.DEFAULT, null, ioReactorConfig);

        client.start();

        final HttpHost target = new HttpHost("nghttp2.org");
        final Future<AsyncClientEndpoint> leaseFuture = client.lease(target, null);
        final AsyncClientEndpoint endpoint = leaseFuture.get(30, TimeUnit.SECONDS);
        try {
            final String[] requestUris = new String[] {"/httpbin/ip", "/httpbin/user-agent", "/httpbin/headers"};

            final CountDownLatch latch = new CountDownLatch(requestUris.length);
            for (final String requestUri: requestUris) {
                final SimpleHttpRequest request = SimpleHttpRequests.GET.create(target, requestUri);
                endpoint.execute(
                        SimpleRequestProducer.create(request),
                        SimpleResponseConsumer.create(),
                        new FutureCallback<SimpleHttpResponse>() {

                            @Override
                            public void completed(final SimpleHttpResponse response) {
                                latch.countDown();
                                System.out.println(requestUri + "->" + response.getCode());
                                System.out.println(response.getBody());
                            }

                            @Override
                            public void failed(final Exception ex) {
                                latch.countDown();
                                System.out.println(requestUri + "->" + ex);
                            }

                            @Override
                            public void cancelled() {
                                latch.countDown();
                                System.out.println(requestUri + " cancelled");
                            }

                        });
            }
            latch.await();
        } finally {
            endpoint.releaseAndReuse();
        }

        System.out.println("Shutting down");
        client.close(CloseMode.GRACEFUL);
    }

}