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