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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_UPDATE_CLIENT_REQUEST_SENDER_H_ |
| 6 #define COMPONENTS_UPDATE_CLIENT_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 update_client { |
| 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 ~RequestSender() override; |
| 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 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 update_client |
| 63 |
| 64 #endif // COMPONENTS_UPDATE_CLIENT_REQUEST_SENDER_H_ |
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