content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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.
   */
  
  package com.alibaba.nacos.common.http.client.request;
  
  import com.alibaba.nacos.common.http.Callback;
  import com.alibaba.nacos.common.http.HttpRestResult;
  import com.alibaba.nacos.common.http.client.handler.ResponseHandler;
  import com.alibaba.nacos.common.http.client.response.DefaultClientHttpResponse;
  import com.alibaba.nacos.common.model.RequestHttpEntity;
  import org.apache.hc.client5.http.async.methods.SimpleHttpRequest;
  import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
  import org.apache.hc.client5.http.classic.methods.HttpUriRequestBase;
  import org.apache.hc.client5.http.config.RequestConfig;
  import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.core5.concurrent.FutureCallback;
  import org.apache.hc.core5.reactor.DefaultConnectingIOReactor;
  import org.apache.hc.core5.reactor.IOReactorStatus;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.net.URI;
  
  /**
   * {@link AsyncHttpClientRequest} implementation that uses apache async http client to execute streaming requests.
   *
   * @author mai.jh
   */
  public class DefaultAsyncHttpClientRequest implements AsyncHttpClientRequest {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(DefaultAsyncHttpClientRequest.class);
      
      private final CloseableHttpAsyncClient asyncClient;
      
      private final RequestConfig defaultConfig;
      
      public DefaultAsyncHttpClientRequest(CloseableHttpAsyncClient asyncClient, DefaultConnectingIOReactor ioReactor, RequestConfig defaultConfig) {
          this.asyncClient = asyncClient;
          this.defaultConfig = defaultConfig;
          if (this.asyncClient.getStatus() != IOReactorStatus.ACTIVE) {
              this.asyncClient.start();
          }
      }
      
      @Override
      public <T> void execute(URI uri, String httpMethod, RequestHttpEntity requestHttpEntity,
              final ResponseHandler<T> responseHandler, final Callback<T> callback) throws Exception {
          HttpUriRequestBase httpRequestBase = DefaultHttpClientRequest.build(uri, httpMethod, requestHttpEntity, defaultConfig);
          // IllegalStateException has been removed from ver.5.0, should catch it in DefaultConnectingIOReactor callback
          FutureCallback<SimpleHttpResponse> futureCallback = new FutureCallback<SimpleHttpResponse>() {
              @Override
              public void completed(SimpleHttpResponse result) {
                  // SimpleHttpResponse doesn't need to close
                  DefaultClientHttpResponse response = new DefaultClientHttpResponse(result);
                  try {
                      HttpRestResult<T> httpRestResult = responseHandler.handle(response);
                      callback.onReceive(httpRestResult);
                  } catch (Exception e) {
                      callback.onError(e);
                  }
              }
              
              @Override
              public void failed(Exception ex) {
                  callback.onError(ex);
              }
              
              @Override
              public void cancelled() {
                  callback.onCancel();
              }
          };
          asyncClient.execute(SimpleHttpRequest.copy(httpRequestBase), futureCallback);
      }
      
      @Override
      public void close() throws IOException {
          this.asyncClient.close();
      }
  }
  