| /* |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you 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. |
| */ |
| |
| /** |
| * @file fetch_policy.h |
| * @brief Fetch policy interface (header file). |
| */ |
| |
| #pragma once |
| |
| #include <list> |
| #include <openssl/sha.h> |
| #include <cstring> |
| #include <string> |
| #include <unordered_map> |
| |
| #include "common.h" |
| |
| class FetchPolicy; |
| class SimplePolicy; |
| class Prescaler; |
| |
| /** |
| * @brief Fetch policy interface. |
| */ |
| class FetchPolicy |
| { |
| public: |
| static FetchPolicy *getInstance(const char *name); |
| virtual ~FetchPolicy(){}; |
| |
| virtual bool init(const char *parameters) = 0; |
| virtual bool acquire(const std::string &url) = 0; |
| virtual bool release(const std::string &url) = 0; |
| virtual const char *name() = 0; |
| virtual size_t getSize() = 0; |
| virtual size_t getMaxSize() = 0; |
| |
| private: |
| FetchPolicy(const FetchPolicy &); |
| FetchPolicy &operator=(const FetchPolicy &); |
| |
| protected: |
| FetchPolicy(){}; |
| void |
| log(const char *msg, const String &url, bool ret) |
| { |
| PrefetchDebug("%s::%s('%.*s%s'): %s", name(), msg, (int)(url.length() > 100 ? 100 : url.length()), url.c_str(), |
| url.length() > 100 ? "..." : "", ret ? "true" : "false"); |
| } |
| }; |