Luke Huang | f40df9c | 2020-04-21 08:51:48 +0800 | [diff] [blame] | 1 | /** |
| 2 | * Copyright (c) 2020, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "Experiments.h" |
| 18 | |
Luke Huang | a893556 | 2020-04-30 11:26:41 +0800 | [diff] [blame] | 19 | #include <android-base/format.h> |
Luke Huang | f40df9c | 2020-04-21 08:51:48 +0800 | [diff] [blame] | 20 | #include <netdutils/DumpWriter.h> |
| 21 | #include <string> |
| 22 | |
| 23 | #include "util.h" |
| 24 | |
| 25 | namespace android::net { |
| 26 | |
| 27 | using netdutils::DumpWriter; |
| 28 | using netdutils::ScopedIndent; |
| 29 | |
| 30 | Experiments* Experiments::getInstance() { |
| 31 | // Instantiated on first use. |
| 32 | static Experiments instance{getExperimentFlagInt}; |
| 33 | return &instance; |
| 34 | } |
| 35 | |
| 36 | Experiments::Experiments(GetExperimentFlagIntFunction getExperimentFlagIntFunction) |
| 37 | : mGetExperimentFlagIntFunction(std::move(getExperimentFlagIntFunction)) { |
| 38 | updateInternal(); |
| 39 | } |
| 40 | |
| 41 | void Experiments::update() { |
| 42 | updateInternal(); |
| 43 | } |
| 44 | |
| 45 | void Experiments::dump(DumpWriter& dw) const { |
| 46 | std::lock_guard guard(mMutex); |
| 47 | dw.println("Experiments list: "); |
| 48 | for (const auto& [key, value] : mFlagsMapInt) { |
| 49 | ScopedIndent indentStats(dw); |
Luke Huang | a893556 | 2020-04-30 11:26:41 +0800 | [diff] [blame] | 50 | if (value == Experiments::kFlagIntDefault) { |
| 51 | dw.println(fmt::format("{}: UNSET", key)); |
| 52 | } else { |
| 53 | dw.println(fmt::format("{}: {}", key, value)); |
| 54 | } |
Luke Huang | f40df9c | 2020-04-21 08:51:48 +0800 | [diff] [blame] | 55 | } |
| 56 | } |
| 57 | |
| 58 | void Experiments::updateInternal() { |
| 59 | std::lock_guard guard(mMutex); |
| 60 | for (const auto& key : kExperimentFlagKeyList) { |
Luke Huang | a893556 | 2020-04-30 11:26:41 +0800 | [diff] [blame] | 61 | mFlagsMapInt[key] = mGetExperimentFlagIntFunction(key, Experiments::kFlagIntDefault); |
Luke Huang | f40df9c | 2020-04-21 08:51:48 +0800 | [diff] [blame] | 62 | } |
| 63 | } |
| 64 | |
| 65 | int Experiments::getFlag(std::string_view key, int defaultValue) const { |
| 66 | std::lock_guard guard(mMutex); |
| 67 | auto it = mFlagsMapInt.find(key); |
Luke Huang | a893556 | 2020-04-30 11:26:41 +0800 | [diff] [blame] | 68 | if (it != mFlagsMapInt.end() && it->second != Experiments::kFlagIntDefault) { |
Luke Huang | f40df9c | 2020-04-21 08:51:48 +0800 | [diff] [blame] | 69 | return it->second; |
| 70 | } |
| 71 | return defaultValue; |
| 72 | } |
| 73 | |
| 74 | } // namespace android::net |