/*
    * ====================================================================
    * 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 java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.hc.client5.http.impl.async.HttpAsyncClients;
  import org.apache.hc.client5.http.impl.async.MinimalHttpAsyncClient;
  import org.apache.hc.core5.http.ContentType;
  import org.apache.hc.core5.http.EntityDetails;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.config.Http1Config;
  import org.apache.hc.core5.http.message.BasicHttpRequest;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http.nio.AsyncClientExchangeHandler;
  import org.apache.hc.core5.http.nio.CapacityChannel;
  import org.apache.hc.core5.http.nio.DataStreamChannel;
  import org.apache.hc.core5.http.nio.RequestChannel;
  import org.apache.hc.core5.http.nio.entity.BasicAsyncEntityProducer;
  import org.apache.hc.core5.http.nio.entity.StringAsyncEntityConsumer;
  import org.apache.hc.core5.http.nio.support.BasicRequestProducer;
  import org.apache.hc.core5.http.nio.support.BasicResponseConsumer;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.http.support.BasicRequestBuilder;
  import org.apache.hc.core5.http2.config.H2Config;
  import org.apache.hc.core5.io.CloseMode;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  
  /**
   * This example demonstrates a full-duplex, streaming HTTP/1.1 message exchange.
   */
  public class AsyncClientFullDuplexExchange {
  
      public static void main(final String[] args) throws Exception {
  
          final MinimalHttpAsyncClient client = HttpAsyncClients.createMinimal(
                  H2Config.DEFAULT,
                  Http1Config.DEFAULT,
                  IOReactorConfig.DEFAULT);
  
          client.start();
  
          final BasicHttpRequest request = BasicRequestBuilder.post("http://httpbin.org/post").build();
          final BasicRequestProducer requestProducer = new BasicRequestProducer(request,
                  new BasicAsyncEntityProducer("stuff", ContentType.TEXT_PLAIN));
          final BasicResponseConsumer<String> responseConsumer = new BasicResponseConsumer<>(
                  new StringAsyncEntityConsumer());
  
          System.out.println("Executing request " + request);
          final CountDownLatch latch = new CountDownLatch(1);
          client.execute(new AsyncClientExchangeHandler() {
  
              @Override
              public void releaseResources() {
                  requestProducer.releaseResources();
                  responseConsumer.releaseResources();
                  latch.countDown();
              }
  
              @Override
              public void cancel() {
                  System.out.println(request + " cancelled");
              }
  
              @Override
              public void failed(final Exception cause) {
                  System.out.println(request + "->" + cause);
              }
  
             @Override
             public void produceRequest(final RequestChannel channel, final HttpContext context) throws HttpException, IOException {
                 requestProducer.sendRequest(channel, context);
             }
 
             @Override
             public int available() {
                 return requestProducer.available();
             }
 
             @Override
             public void produce(final DataStreamChannel channel) throws IOException {
                 requestProducer.produce(channel);
             }
 
             @Override
             public void consumeInformation(
                     final HttpResponse response,
                     final HttpContext context) {
                 System.out.println(request + "->" + new StatusLine(response));
             }
 
             @Override
             public void consumeResponse(
                     final HttpResponse response,
                     final EntityDetails entityDetails,
                     final HttpContext context) throws HttpException, IOException {
                 System.out.println(request + "->" + new StatusLine(response));
                 responseConsumer.consumeResponse(response, entityDetails, context, null);
             }
 
             @Override
             public void updateCapacity(final CapacityChannel capacityChannel) throws IOException {
                 responseConsumer.updateCapacity(capacityChannel);
             }
 
             @Override
             public void consume(final ByteBuffer src) throws IOException {
                 responseConsumer.consume(src);
             }
 
             @Override
             public void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException {
                 responseConsumer.streamEnd(trailers);
             }
 
         });
         latch.await(1, TimeUnit.MINUTES);
 
         System.out.println("Shutting down");
         client.close(CloseMode.GRACEFUL);
     }
 
 }