/*
    * ====================================================================
    * 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.util.concurrent.ExecutionException;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.http.HttpHost;
  import org.apache.http.HttpResponse;
  import org.apache.http.ProtocolException;
  import org.apache.http.client.cache.HttpCacheContext;
  import org.apache.http.client.cache.HttpCacheEntry;
  import org.apache.http.client.methods.HttpRequestWrapper;
  import org.apache.http.concurrent.BasicFuture;
  import org.apache.http.concurrent.FutureCallback;
  
  /**
   * Class used to represent an asynchronous revalidation event, such as with
   * "stale-while-revalidate"
   */
  class AsynchronousAsyncValidationRequest implements Runnable {
      private final AsynchronousAsyncValidator parent;
      private final CachingHttpAsyncClient cachingAsyncClient;
      private final HttpHost target;
      private final HttpRequestWrapper request;
      private final HttpCacheContext clientContext;
      private final HttpCacheEntry cacheEntry;
      private final String identifier;
  
      private final Log log = LogFactory.getLog(getClass());
  
      /**
       * Used internally by {@link AsynchronousValidator} to schedule a
       * revalidation.
       */
      AsynchronousAsyncValidationRequest(final AsynchronousAsyncValidator parent,
              final CachingHttpAsyncClient cachingClient, final HttpHost target, final HttpRequestWrapper request,
              final HttpCacheContext clientContext, final HttpCacheEntry cacheEntry, final String identifier) {
          this.parent = parent;
          this.cachingAsyncClient = cachingClient;
          this.target = target;
          this.request = request;
          this.clientContext = clientContext;
          this.cacheEntry = cacheEntry;
          this.identifier = identifier;
      }
  
      @Override
      public void run() {
          try {
              final FutureCallback<HttpResponse> callback = new FutureCallback<HttpResponse>() {
  
                  @Override
                  public void cancelled() {
                  }
  
                  @Override
                  public void completed(final HttpResponse httpResponse) {
                  }
  
                  @Override
                  public void failed(final Exception e) {
                      log.debug("Asynchronous revalidation failed", e);
                  }
              };
              final BasicFuture<HttpResponse> future = new BasicFuture<HttpResponse>(callback);
              this.cachingAsyncClient.revalidateCacheEntry(future, this.target, this.request,
                      this.clientContext, this.cacheEntry);
              future.get();
          } catch (final ProtocolException pe) {
              this.log.error("ProtocolException thrown during asynchronous revalidation", pe);
          } catch (final ExecutionException e) {
              this.log.error("Exception thrown during asynchronous revalidation", e.getCause());
          } catch (final InterruptedException e) {
             Thread.currentThread().interrupt();
         } finally {
             this.parent.markComplete(this.identifier);
         }
     }
 
     String getIdentifier() {
         return this.identifier;
     }
 
 }