/*
    * ====================================================================
    * 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/>.
   *
   */
  package org.apache.hc.client5.http.examples;
  
  import org.apache.hc.client5.http.classic.methods.HttpGet;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpResponse;
  import org.apache.hc.client5.http.impl.classic.HttpClients;
  import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager;
  import org.apache.hc.core5.http.HttpEntity;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.protocol.BasicHttpContext;
  import org.apache.hc.core5.http.protocol.HttpContext;
  
  /**
   * An example that performs GETs from multiple threads.
   *
   */
  public class ClientMultiThreadedExecution {
  
      public static void main(final String[] args) throws Exception {
          // Create an HttpClient with the PoolingHttpClientConnectionManager.
          // This connection manager must be used if more than one thread will
          // be using the HttpClient.
          final PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager();
          cm.setMaxTotal(100);
  
          try (final CloseableHttpClient httpclient = HttpClients.custom()
                  .setConnectionManager(cm)
                  .build()) {
              // create an array of URIs to perform GETs on
              final String[] urisToGet = {
                      "http://hc.apache.org/",
                      "http://hc.apache.org/httpcomponents-core-ga/",
                      "http://hc.apache.org/httpcomponents-client-ga/",
              };
  
              // create a thread for each URI
              final GetThread[] threads = new GetThread[urisToGet.length];
              for (int i = 0; i < threads.length; i++) {
                  final HttpGet httpget = new HttpGet(urisToGet[i]);
                  threads[i] = new GetThread(httpclient, httpget, i + 1);
              }
  
              // start the threads
              for (final GetThread thread : threads) {
                  thread.start();
              }
  
              // join the threads
              for (final GetThread thread : threads) {
                  thread.join();
              }
  
          }
      }
  
      /**
       * A thread that performs a GET.
       */
      static class GetThread extends Thread {
  
          private final CloseableHttpClient httpClient;
          private final HttpContext context;
          private final HttpGet httpget;
          private final int id;
  
          public GetThread(final CloseableHttpClient httpClient, final HttpGet httpget, final int id) {
              this.httpClient = httpClient;
              this.context = new BasicHttpContext();
              this.httpget = httpget;
              this.id = id;
          }
  
          /**
          * Executes the GetMethod and prints some status information.
          */
         @Override
         public void run() {
             try {
                 System.out.println(id + " - about to get something from " + httpget.getUri());
                 try (CloseableHttpResponse response = httpClient.execute(httpget, context)) {
                     System.out.println(id + " - get executed");
                     // get the response body as an array of bytes
                     final HttpEntity entity = response.getEntity();
                     if (entity != null) {
                         final byte[] bytes = EntityUtils.toByteArray(entity);
                         System.out.println(id + " - " + bytes.length + " bytes read");
                     }
                 }
             } catch (final Exception e) {
                 System.out.println(id + " - error: " + e);
             }
         }
 
     }
 
 }