text: // Copyright (c) 2012 The Chromium Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  #ifndef CONTENT_PUBLIC_BROWSER_DOWNLOAD_DESTINATION_OBSERVER_H_
  #define CONTENT_PUBLIC_BROWSER_DOWNLOAD_DESTINATION_OBSERVER_H_
  
  #include <stdint.h>
  
  #include <string>
  
  #include "content/public/browser/download_interrupt_reasons.h"
  
  namespace content {
  
  // Class that receives asynchronous events from a DownloadDestination about
  // downloading progress and completion.  These should report status when the
  // data arrives at its final location; i.e. DestinationUpdate should be
  // called after the destination is finished with whatever operation it
  // is doing on the data described by |bytes_so_far| and DestinationCompleted
  // should only be called once that is true for all data.
  //
  // All methods are invoked on the UI thread.
  //
  // Note that this interface does not deal with cross-thread lifetime issues.
  class DownloadDestinationObserver {
   public:
    virtual void DestinationUpdate(int64_t bytes_so_far,
                                   int64_t bytes_per_sec,
                                   const std::string& hash_state) = 0;
  
    virtual void DestinationError(DownloadInterruptReason reason) = 0;
  
    virtual void DestinationCompleted(const std::string& final_hash) = 0;
  };
  
  }  // namespace content
  
  #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_DESTINATION_OBSERVER_H_
  