/*
    * ====================================================================
    * 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.http.impl.client;
  
  import java.io.IOException;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.http.HttpException;
  import org.apache.http.HttpHost;
  import org.apache.http.HttpRequest;
  import org.apache.http.annotation.Contract;
  import org.apache.http.annotation.ThreadingBehavior;
  import org.apache.http.client.ClientProtocolException;
  import org.apache.http.client.config.RequestConfig;
  import org.apache.http.client.methods.CloseableHttpResponse;
  import org.apache.http.client.methods.Configurable;
  import org.apache.http.client.methods.HttpExecutionAware;
  import org.apache.http.client.methods.HttpRequestWrapper;
  import org.apache.http.client.protocol.HttpClientContext;
  import org.apache.http.conn.ClientConnectionManager;
  import org.apache.http.conn.ClientConnectionRequest;
  import org.apache.http.conn.HttpClientConnectionManager;
  import org.apache.http.conn.ManagedClientConnection;
  import org.apache.http.conn.routing.HttpRoute;
  import org.apache.http.conn.scheme.SchemeRegistry;
  import org.apache.http.impl.DefaultConnectionReuseStrategy;
  import org.apache.http.impl.execchain.MinimalClientExec;
  import org.apache.http.params.BasicHttpParams;
  import org.apache.http.params.HttpParams;
  import org.apache.http.protocol.BasicHttpContext;
  import org.apache.http.protocol.HttpContext;
  import org.apache.http.protocol.HttpRequestExecutor;
  import org.apache.http.util.Args;
  
  /**
   * Internal class.
   *
   * @since 4.3
   */
  @Contract(threading = ThreadingBehavior.SAFE_CONDITIONAL)
  @SuppressWarnings("deprecation")
  class MinimalHttpClient extends CloseableHttpClient {
  
      private final HttpClientConnectionManager connManager;
      private final MinimalClientExec requestExecutor;
      private final HttpParams params;
  
      public MinimalHttpClient(
              final HttpClientConnectionManager connManager) {
          super();
          this.connManager = Args.notNull(connManager, "HTTP connection manager");
          this.requestExecutor = new MinimalClientExec(
                  new HttpRequestExecutor(),
                  connManager,
                  DefaultConnectionReuseStrategy.INSTANCE,
                  DefaultConnectionKeepAliveStrategy.INSTANCE);
          this.params = new BasicHttpParams();
      }
  
      @Override
      protected CloseableHttpResponse doExecute(
              final HttpHost target,
              final HttpRequest request,
              final HttpContext context) throws IOException, ClientProtocolException {
          Args.notNull(target, "Target host");
          Args.notNull(request, "HTTP request");
          HttpExecutionAware execAware = null;
          if (request instanceof HttpExecutionAware) {
              execAware = (HttpExecutionAware) request;
          }
          try {
              final HttpRequestWrapper wrapper = HttpRequestWrapper.wrap(request);
              final HttpClientContext localcontext = HttpClientContext.adapt(
                  context != null ? context : new BasicHttpContext());
             final HttpRouteg/HttpRoute.html#HttpRoute">HttpRoute route = new HttpRoute(target);
             RequestConfig config = null;
             if (request instanceof Configurable) {
                 config = ((Configurable) request).getConfig();
             }
             if (config != null) {
                 localcontext.setRequestConfig(config);
             }
             return this.requestExecutor.execute(route, wrapper, localcontext, execAware);
         } catch (final HttpException httpException) {
             throw new ClientProtocolException(httpException);
         }
     }
 
     @Override
     public HttpParams getParams() {
         return this.params;
     }
 
     @Override
     public void close() {
         this.connManager.shutdown();
     }
 
     @Override
     public ClientConnectionManager getConnectionManager() {
 
         return new ClientConnectionManager() {
 
             @Override
             public void shutdown() {
                 connManager.shutdown();
             }
 
             @Override
             public ClientConnectionRequest requestConnection(
                     final HttpRoute route, final Object state) {
                 throw new UnsupportedOperationException();
             }
 
             @Override
             public void releaseConnection(
                     final ManagedClientConnection conn,
                     final long validDuration, final TimeUnit timeUnit) {
                 throw new UnsupportedOperationException();
             }
 
             @Override
             public SchemeRegistry getSchemeRegistry() {
                 throw new UnsupportedOperationException();
             }
 
             @Override
             public void closeIdleConnections(final long idletime, final TimeUnit timeUnit) {
                 connManager.closeIdleConnections(idletime, timeUnit);
             }
 
             @Override
             public void closeExpiredConnections() {
                 connManager.closeExpiredConnections();
             }
 
         };
 
     }
 
 }