/*
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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
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
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   */
  package org.apache.hc.client5.http.examples;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.Future;
  
  import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
  import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
  import org.apache.hc.client5.http.async.methods.SimpleRequestBuilder;
  import org.apache.hc.client5.http.async.methods.SimpleRequestProducer;
  import org.apache.hc.client5.http.async.methods.SimpleResponseConsumer;
  import org.apache.hc.client5.http.config.TlsConfig;
  import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManagerBuilder;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http2.HttpVersionPolicy;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  import org.apache.hc.core5.util.Timeout;
  
  /**
   * Example of asynchronous HTTP/1.1 request execution with message exchange multiplexing
   * over HTTP/2 connections.
   */
  public class AsyncClientH2Multiplexing {
  
      public static void main(final String[] args) throws Exception {
  
          final IOReactorConfig ioReactorConfig = IOReactorConfig.custom()
                  .setSoTimeout(Timeout.ofSeconds(5))
                  .build();
  
          final PoolingAsyncClientConnectionManager connectionManager = PoolingAsyncClientConnectionManagerBuilder.create()
                  .setDefaultTlsConfig(TlsConfig.custom()
                          .setVersionPolicy(HttpVersionPolicy.FORCE_HTTP_2)
                          .build())
                  .setMessageMultiplexing(true)
                  .build();
  
          final CloseableHttpAsyncClient client = HttpAsyncClients.custom()
                  .setConnectionManager(connectionManager)
                  .setIOReactorConfig(ioReactorConfig)
                  .build();
  
          client.start();
  
          final HttpHost target = new HttpHost("https", "nghttp2.org");
  
          final SimpleHttpRequest warmup = SimpleRequestBuilder.get()
                  .setHttpHost(target)
                  .setPath("/httpbin")
                  .build();
  
          // Make sure there is an open HTTP/2 connection in the pool
          System.out.println("Executing warm-up request " + warmup);
          final Future<SimpleHttpResponse> future = client.execute(
                  SimpleRequestProducer.create(warmup),
                  SimpleResponseConsumer.create(),
                  new FutureCallback<SimpleHttpResponse>() {
  
                      @Override
                      public void completed(final SimpleHttpResponse response) {
                          System.out.println(warmup + "->" + new StatusLine(response));
                          System.out.println(response.getBody());
                      }
  
                      @Override
                      public void failed(final Exception ex) {
                          System.out.println(warmup + "->" + ex);
                      }
 
                     @Override
                     public void cancelled() {
                         System.out.println(warmup + " cancelled");
                     }
 
                 });
         future.get();
 
         Thread.sleep(1000);
 
         System.out.println("Connection pool stats: " + connectionManager.getTotalStats());
 
         // Execute multiple requests over the HTTP/2 connection from the pool
         final String[] requestUris = new String[]{"/httpbin", "/httpbin/ip", "/httpbin/user-agent", "/httpbin/headers"};
         final CountDownLatch countDownLatch = new CountDownLatch(requestUris.length);
 
         for (final String requestUri : requestUris) {
             final SimpleHttpRequest request = SimpleRequestBuilder.get()
                     .setHttpHost(target)
                     .setPath(requestUri)
                     .build();
 
             System.out.println("Executing request " + request);
             client.execute(
                     SimpleRequestProducer.create(request),
                     SimpleResponseConsumer.create(),
                     new FutureCallback<SimpleHttpResponse>() {
 
                         @Override
                         public void completed(final SimpleHttpResponse response) {
                             countDownLatch.countDown();
                             System.out.println(request + "->" + new StatusLine(response));
                             System.out.println(response.getBody());
                         }
 
                         @Override
                         public void failed(final Exception ex) {
                             countDownLatch.countDown();
                             System.out.println(request + "->" + ex);
                         }
 
                         @Override
                         public void cancelled() {
                             countDownLatch.countDown();
                             System.out.println(request + " cancelled");
                         }
 
                     });
         }
 
         countDownLatch.await();
 
         // There still should be a single connection in the pool
         System.out.println("Connection pool stats: " + connectionManager.getTotalStats());
 
         System.out.println("Shutting down");
         client.close(CloseMode.GRACEFUL);
     }
 
 }