components/dom_distiller/core/distiller_url_fetcher.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_URL_FETCHER_H_
   6 #define COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_URL_FETCHER_H_
   7
   8 #include <string>
   9
  10 #include "base/callback.h"
  11 #include "net/url_request/url_fetcher.h"
  12 #include "net/url_request/url_fetcher_delegate.h"
  13 #include "net/url_request/url_request_context_getter.h"
  14
  15 namespace dom_distiller {
  16
  17 class DistillerURLFetcher;
  18
  19 // Class for creating a DistillerURLFetcher.
  20 class DistillerURLFetcherFactory {
  21  public:
  22   explicit DistillerURLFetcherFactory(
  23       net::URLRequestContextGetter* context_getter);
  24   virtual ~DistillerURLFetcherFactory() {}
  25   virtual DistillerURLFetcher* CreateDistillerURLFetcher() const;
  26
  27  private:
  28   net::URLRequestContextGetter* context_getter_;
  29 };
  30
  31 // This class fetches a URL, and notifies the caller when the operation
  32 // completes or fails. If the request fails, an empty string will be returned.
  33 class DistillerURLFetcher : public net::URLFetcherDelegate {
  34  public:
  35   explicit DistillerURLFetcher(net::URLRequestContextGetter* context_getter);
  36   ~DistillerURLFetcher() override;
  37
  38   // Indicates when a fetch is done.
  39   typedef base::Callback<void(const std::string& data)> URLFetcherCallback;
  40
  41   // Fetches a |url|. Notifies when the fetch is done via |callback|.
  42   virtual void FetchURL(const std::string& url,
  43                         const URLFetcherCallback& callback);
  44
  45  protected:
  46   virtual net::URLFetcher* CreateURLFetcher(
  47       net::URLRequestContextGetter* context_getter,
  48       const std::string& url);
  49
  50  private:
  51   // net::URLFetcherDelegate:
  52   void OnURLFetchComplete(const net::URLFetcher* source) override;
  53
  54   scoped_ptr<net::URLFetcher> url_fetcher_;
  55   URLFetcherCallback callback_;
  56   net::URLRequestContextGetter* context_getter_;
  57   DISALLOW_COPY_AND_ASSIGN(DistillerURLFetcher);
  58 };
  59
  60 }  //  namespace dom_distiller
  61
  62 #endif  // COMPONENTS_DOM_DISTILLER_CORE_DISTILLER_URL_FETCHER_H_