/*
    * ====================================================================
    * 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.cache;
  
  import java.io.IOException;
  import java.lang.reflect.UndeclaredThrowableException;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.Future;
  
  import org.apache.http.HttpException;
  import org.apache.http.HttpResponse;
  import org.apache.http.client.methods.CloseableHttpResponse;
  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.routing.HttpRoute;
  import org.apache.http.impl.execchain.ClientExecChain;
  
  public class CachingHttpAsyncClientExecChain implements ClientExecChain {
  
      private final CachingHttpAsyncClient client;
  
      public CachingHttpAsyncClientExecChain(final ClientExecChain backend) {
          this(backend, new BasicHttpCache(), CacheConfig.DEFAULT);
      }
  
      public CachingHttpAsyncClientExecChain(
              final ClientExecChain backend,
              final HttpCache cache,
              final CacheConfig config) {
          this.client = new CachingHttpAsyncClient(
                  new ClientExecChainAsyncClient(backend), cache, config);
      }
  
      CachingHttpAsyncClientExecChain(
              final ClientExecChain backend, final HttpCache responseCache,
              final CacheValidityPolicy validityPolicy,
              final ResponseCachingPolicy responseCachingPolicy,
              final CachedHttpResponseGenerator responseGenerator,
              final CacheableRequestPolicy cacheableRequestPolicy,
              final CachedResponseSuitabilityChecker suitabilityChecker,
              final ConditionalRequestBuilder conditionalRequestBuilder,
              final ResponseProtocolCompliance responseCompliance,
              final RequestProtocolCompliance requestCompliance) {
          this.client = new CachingHttpAsyncClient(
                  new ClientExecChainAsyncClient(backend), validityPolicy,
                  responseCachingPolicy, responseCache, responseGenerator,
                  cacheableRequestPolicy, suitabilityChecker,
                  conditionalRequestBuilder, responseCompliance,
                  requestCompliance);
      }
  
      public boolean supportsRangeAndContentRangeHeaders() {
          return client.supportsRangeAndContentRangeHeaders();
      }
  
      public CloseableHttpResponse execute(
              final HttpRoute route,
              final HttpRequestWrapper request) throws IOException, HttpException {
          return execute(route, request, HttpClientContext.create(), null);
      }
  
      public CloseableHttpResponse execute(
              final HttpRoute route,
              final HttpRequestWrapper request,
              final HttpClientContext context) throws IOException, HttpException {
          return execute(route, request, context, null);
      }
  
      @Override
      public CloseableHttpResponse execute(
              final HttpRoute route,
              final HttpRequestWrapper request,
              final HttpClientContext context,
              final HttpExecutionAware execAware) throws IOException, HttpException {
         try {
             final Future<HttpResponse> future = client.execute(route.getTargetHost(), request, context, null);
             return Proxies.enhanceResponse(future.get());
         } catch (final InterruptedException e) {
             Thread.currentThread().interrupt();
             return null;
         } catch (final ExecutionException e) {
             try {
                 throw e.getCause();
             } catch (final IOException ex) {
                 throw ex;
             } catch (final HttpException ex) {
                 throw ex;
             } catch (final RuntimeException ex) {
                 throw ex;
             } catch (final Error ex) {
                 throw ex;
             } catch (final Throwable ex) {
                 throw new UndeclaredThrowableException(ex);
             }
         }
     }
 
     public long getCacheHits() {
         return client.getCacheHits();
     }
 
     public long getCacheMisses() {
         return client.getCacheMisses();
     }
 
     public long getCacheUpdates() {
         return client.getCacheUpdates();
     }
 
 }