| /* |
| * Copyright 2015 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef COBALT_LOADER_FETCHER_H_ |
| #define COBALT_LOADER_FETCHER_H_ |
| |
| #include <string> |
| |
| #include "base/callback.h" |
| #include "cobalt/loader/loader_types.h" |
| #include "googleurl/src/gurl.h" |
| #include "net/http/http_response_headers.h" |
| |
| namespace cobalt { |
| namespace loader { |
| |
| class Fetcher { |
| public: |
| class Handler { |
| public: |
| // The function will be called by supported Fetcher (like NetFetcher) before |
| // any OnReceived() is called so the Handler can preview the response. |
| virtual LoadResponseType OnResponseStarted( |
| Fetcher* fetcher, |
| const scoped_refptr<net::HttpResponseHeaders>& headers) |
| WARN_UNUSED_RESULT { |
| UNREFERENCED_PARAMETER(fetcher); |
| UNREFERENCED_PARAMETER(headers); |
| return kLoadResponseContinue; |
| } |
| virtual void OnReceived(Fetcher* fetcher, const char* data, |
| size_t size) = 0; |
| virtual void OnDone(Fetcher* fetcher) = 0; |
| virtual void OnError(Fetcher* fetcher, const std::string& error) = 0; |
| |
| protected: |
| Handler() {} |
| virtual ~Handler() {} |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(Handler); |
| }; |
| |
| // Concrete Fetcher subclass should start fetching immediately in constructor. |
| explicit Fetcher(Handler* handler) : handler_(handler) {} |
| |
| // Concrete Fetcher subclass should cancel fetching in destructor. |
| virtual ~Fetcher() = 0; |
| |
| protected: |
| Handler* handler() const { return handler_; } |
| |
| private: |
| Handler* handler_; |
| }; |
| |
| } // namespace loader |
| } // namespace cobalt |
| |
| #endif // COBALT_LOADER_FETCHER_H_ |