| // Copyright 2014 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 COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_URL_FETCHER_H_ |
| #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_URL_FETCHER_H_ |
| |
| #include "base/callback.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "net/url_request/url_fetcher_delegate.h" |
| #include "url/gurl.h" |
| |
| namespace translate { |
| |
| // Downloads raw Translate data such as the Translate script and the language |
| // list. |
| class TranslateURLFetcher : public net::URLFetcherDelegate { |
| public: |
| // Callback type for Request(). |
| typedef base::Callback<void(int, bool, const std::string&)> Callback; |
| |
| // Represents internal state if the fetch is completed successfully. |
| enum State { |
| IDLE, // No fetch request was issued. |
| REQUESTING, // A fetch request was issued, but not finished yet. |
| COMPLETED, // The last fetch request was finished successfully. |
| FAILED, // The last fetch request was finished with a failure. |
| }; |
| |
| explicit TranslateURLFetcher(int id); |
| ~TranslateURLFetcher() override; |
| |
| int max_retry_on_5xx() { |
| return max_retry_on_5xx_; |
| } |
| void set_max_retry_on_5xx(int count) { |
| max_retry_on_5xx_ = count; |
| } |
| |
| const std::string& extra_request_header() { |
| return extra_request_header_; |
| } |
| void set_extra_request_header(const std::string& header) { |
| extra_request_header_ = header; |
| } |
| |
| // Requests to |url|. |callback| will be invoked when the function returns |
| // true, and the request is finished asynchronously. |
| // Returns false if the previous request is not finished, or the request |
| // is omitted due to retry limitation. |
| bool Request(const GURL& url, const Callback& callback); |
| |
| // Gets internal state. |
| State state() { return state_; } |
| |
| // net::URLFetcherDelegate implementation: |
| void OnURLFetchComplete(const net::URLFetcher* source) override; |
| |
| private: |
| // URL to send the request. |
| GURL url_; |
| |
| // ID which is assigned to the URLFetcher. |
| const int id_; |
| |
| // Internal state. |
| enum State state_; |
| |
| // URLFetcher instance. |
| scoped_ptr<net::URLFetcher> fetcher_; |
| |
| // Callback passed at Request(). It will be invoked when an asynchronous |
| // fetch operation is finished. |
| Callback callback_; |
| |
| // Counts how many times did it try to fetch the language list. |
| int retry_count_; |
| |
| // Max number how many times to retry on the server error |
| int max_retry_on_5xx_; |
| |
| // An extra HTTP request header |
| std::string extra_request_header_; |
| |
| DISALLOW_COPY_AND_ASSIGN(TranslateURLFetcher); |
| }; |
| |
| } // namespace translate |
| |
| #endif // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_URL_FETCHER_H_ |