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1 // Copyright 2014 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_COMPONENT_UPDATER_REQUEST_SENDER_H_
6 #define COMPONENTS_COMPONENT_UPDATER_REQUEST_SENDER_H_
7 
8 #include <string>
9 #include <vector>
10 
11 #include "base/callback.h"
12 #include "base/compiler_specific.h"
13 #include "base/macros.h"
14 #include "base/memory/scoped_ptr.h"
15 #include "base/threading/thread_checker.h"
16 #include "net/url_request/url_fetcher_delegate.h"
17 #include "url/gurl.h"
18 
19 namespace net {
20 class URLFetcher;
21 }
22 
23 namespace component_updater {
24 
25 class Configurator;
26 
27 // Sends a request to one of the urls provided. The class implements a chain
28 // of responsibility design pattern, where the urls are tried in the order they
29 // are specified, until the request to one of them succeeds or all have failed.
30 class RequestSender : public net::URLFetcherDelegate {
31  public:
32   // The |source| refers to the fetcher object used to make the request. This
33   // parameter can be NULL in some error cases.
34   typedef base::Callback<void(const net::URLFetcher* source)>
35       RequestSenderCallback;
36 
37   explicit RequestSender(const Configurator& config);
38   virtual ~RequestSender();
39 
40   void Send(const std::string& request_string,
41             const std::vector<GURL>& urls,
42             const RequestSenderCallback& request_sender_callback);
43 
44  private:
45   void SendInternal();
46 
47   // Overrides for URLFetcherDelegate.
48   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
49 
50   const Configurator& config_;
51   std::vector<GURL> urls_;
52   std::vector<GURL>::const_iterator cur_url_;
53   scoped_ptr<net::URLFetcher> url_fetcher_;
54   std::string request_string_;
55   RequestSenderCallback request_sender_callback_;
56 
57   base::ThreadChecker thread_checker_;
58 
59   DISALLOW_COPY_AND_ASSIGN(RequestSender);
60 };
61 
62 }  // namespace component_updater
63 
64 #endif  // COMPONENTS_COMPONENT_UPDATER_REQUEST_SENDER_H_
65