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   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
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   *
   * This software consists of voluntary contributions made by many
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  package org.apache.hc.client5.testing.async;
  
  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.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.client5.http.impl.nio.PoolingAsyncClientConnectionManager;
  import org.apache.hc.client5.http.protocol.HttpClientContext;
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.EndpointDetails;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.HttpStatus;
  import org.apache.hc.core5.http.URIScheme;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.protocol.BasicHttpContext;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.http.protocol.HttpCoreContext;
  import org.apache.hc.core5.net.URIAuthority;
  import org.apache.hc.core5.testing.nio.H2TestServer;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  public class TestHttp1AsyncStatefulConnManagement extends AbstractIntegrationTestBase {
  
      public TestHttp1AsyncStatefulConnManagement() {
          super(URIScheme.HTTP);
      }
  
      protected H2TestServer startServer() throws Exception {
          return startServer(Http1Config.DEFAULT, null, null);
      }
  
      @Test
      public void testStatefulConnections() throws Exception {
          final H2TestServer server = startServer();
          server.register("*", () -> new AbstractSimpleServerExchangeHandler() {
  
              @Override
              protected SimpleHttpResponse handle(
                      final SimpleHttpRequest request,
                      final HttpCoreContext context) throws HttpException {
                  final SimpleHttpResponse response = new SimpleHttpResponse(HttpStatus.SC_OK);
                  response.setBody("Whatever", ContentType.TEXT_PLAIN);
                  return response;
              }
          });
  
          final HttpHost target = targetHost();
  
          final CloseableHttpAsyncClient client = startClient(builer -> builer
                  .setUserTokenHandler((route, context) -> context.getAttribute("user")));
  
          final int workerCount = 2;
          final int requestCount = 5;
  
          final HttpContext[] contexts = new HttpContext[workerCount];
          final HttpWorker[] workers = new HttpWorker[workerCount];
          for (int i = 0; i < contexts.length; i++) {
              final HttpClientContext context = HttpClientContext.create();
              contexts[i] = context;
              workers[i] = new HttpWorker(
                      "user" + i,
                      context, requestCount, target, client);
          }
  
          for (final HttpWorker worker : workers) {
              worker.start();
          }
          for (final HttpWorker worker : workers) {
             worker.join(TIMEOUT.toMilliseconds());
         }
         for (final HttpWorker worker : workers) {
             final Exception ex = worker.getException();
             if (ex != null) {
                 throw ex;
             }
             Assertions.assertEquals(requestCount, worker.getCount());
         }
 
         for (final HttpContext context : contexts) {
             final String state0 = (String) context.getAttribute("r0");
             Assertions.assertNotNull(state0);
             for (int r = 1; r < requestCount; r++) {
                 Assertions.assertEquals(state0, context.getAttribute("r" + r));
             }
         }
 
     }
 
     static class HttpWorker extends Thread {
 
         private final String uid;
         private final HttpClientContext context;
         private final int requestCount;
         private final HttpHost target;
         private final CloseableHttpAsyncClient httpclient;
 
         private volatile Exception exception;
         private volatile int count;
 
         public HttpWorker(
                 final String uid,
                 final HttpClientContext context,
                 final int requestCount,
                 final HttpHost target,
                 final CloseableHttpAsyncClient httpclient) {
             super();
             this.uid = uid;
             this.context = context;
             this.requestCount = requestCount;
             this.target = target;
             this.httpclient = httpclient;
             this.count = 0;
         }
 
         public int getCount() {
             return count;
         }
 
         public Exception getException() {
             return exception;
         }
 
         @Override
         public void run() {
             try {
                 context.setAttribute("user", uid);
                 for (int r = 0; r < requestCount; r++) {
                     final SimpleHttpRequest request = SimpleRequestBuilder.get()
                             .setHttpHost(target)
                             .setPath("/")
                             .build();
                     final Future<SimpleHttpResponse> future = httpclient.execute(request, null);
                     future.get();
 
                     count++;
                     final EndpointDetails endpointDetails = context.getEndpointDetails();
                     final String connuid = Integer.toHexString(System.identityHashCode(endpointDetails));
                     context.setAttribute("r" + r, connuid);
                 }
 
             } catch (final Exception ex) {
                 exception = ex;
             }
         }
 
     }
 
     @Test
     public void testRouteSpecificPoolRecylcing() throws Exception {
         final H2TestServer server = startServer();
         server.register("*", () -> new AbstractSimpleServerExchangeHandler() {
 
             @Override
             protected SimpleHttpResponse handle(
                     final SimpleHttpRequest request,
                     final HttpCoreContext context) throws HttpException {
                 final SimpleHttpResponse response = new SimpleHttpResponse(HttpStatus.SC_OK);
                 response.setBody("Whatever", ContentType.TEXT_PLAIN);
                 return response;
             }
         });
 
         // This tests what happens when a maxed connection pool needs
         // to kill the last idle connection to a route to build a new
         // one to the same route.
 
         final HttpHost target = targetHost();
 
         final CloseableHttpAsyncClient client = startClient(builer -> builer
                 .setUserTokenHandler((route, context) -> context.getAttribute("user")));
         final PoolingAsyncClientConnectionManager connManager = connManager();
 
         final int maxConn = 2;
         // We build a client with 2 max active // connections, and 2 max per route.
         connManager.setMaxTotal(maxConn);
         connManager.setDefaultMaxPerRoute(maxConn);
 
         // Bottom of the pool : a *keep alive* connection to Route 1.
         final HttpContext context1 = new BasicHttpContext();
         context1.setAttribute("user", "stuff");
 
         final SimpleHttpRequest request1 = SimpleRequestBuilder.get()
                 .setHttpHost(target)
                 .setPath("/")
                 .build();
         final Future<SimpleHttpResponse> future1 = client.execute(request1, context1, null);
         final HttpResponse response1 = future1.get();
         Assertions.assertNotNull(response1);
         Assertions.assertEquals(200, response1.getCode());
 
         // The ConnPoolByRoute now has 1 free connection, out of 2 max
         // The ConnPoolByRoute has one RouteSpcfcPool, that has one free connection
         // for [localhost][stuff]
 
         Thread.sleep(100);
 
         // Send a very simple HTTP get (it MUST be simple, no auth, no proxy, no 302, no 401, ...)
         // Send it to another route. Must be a keepalive.
         final HttpContext context2 = new BasicHttpContext();
 
         final SimpleHttpRequest request2 = SimpleRequestBuilder.get()
                 .setScheme(target.getSchemeName())
                 .setAuthority(new URIAuthority("127.0.0.1", target.getPort()))
                 .setPath("/")
                 .build();
         final Future<SimpleHttpResponse> future2 = client.execute(request2, context2, null);
         final HttpResponse response2 = future2.get();
         Assertions.assertNotNull(response2);
         Assertions.assertEquals(200, response2.getCode());
 
         // ConnPoolByRoute now has 2 free connexions, out of its 2 max.
         // The [localhost][stuff] RouteSpcfcPool is the same as earlier
         // And there is a [127.0.0.1][null] pool with 1 free connection
 
         Thread.sleep(100);
 
         // This will put the ConnPoolByRoute to the targeted state :
         // [localhost][stuff] will not get reused because this call is [localhost][null]
         // So the ConnPoolByRoute will need to kill one connection (it is maxed out globally).
         // The killed conn is the oldest, which means the first HTTPGet ([localhost][stuff]).
         // When this happens, the RouteSpecificPool becomes empty.
         final HttpContext context3 = new BasicHttpContext();
 
         final SimpleHttpRequest request3 = SimpleRequestBuilder.get()
                 .setHttpHost(target)
                 .setPath("/")
                 .build();
         final Future<SimpleHttpResponse> future3 = client.execute(request3, context3, null);
         final HttpResponse response3 = future3.get();
         Assertions.assertNotNull(response3);
         Assertions.assertEquals(200, response3.getCode());
     }
 
 }