mirror of
https://github.com/kidfromjupiter/nearby.git
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93 lines
3.6 KiB
C++
93 lines
3.6 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef PLATFORM_BASE_FEATURE_FLAGS_H_
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#define PLATFORM_BASE_FEATURE_FLAGS_H_
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#include "absl/synchronization/mutex.h"
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#include "absl/time/time.h"
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namespace nearby {
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// Global flags that control feature availability. This may be used to gating
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// features in development, QA testing and releasing.
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class FeatureFlags {
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public:
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// Holds for all the feature flags.
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struct Flags {
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bool enable_cancellation_flag = false;
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bool enable_async_bandwidth_upgrade = true;
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// If a scheduled runnable is already running, Cancel() will synchronously
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// wait for the task to complete.
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bool cancel_waits_for_running_tasks = true;
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// Keep Alive frame interval and timeout in millis.
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std::int32_t keep_alive_interval_millis = 5000;
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std::int32_t keep_alive_timeout_millis = 30000;
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bool use_exp_backoff_in_bwu_retry = true;
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// without the exp backoff, retry intervals in seconds: 5, 10, 10, 10...
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// with the exp backoff, retry intervals in seconds: 3, 6, 12, 24...
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absl::Duration bwu_retry_exp_backoff_initial_delay = absl::Seconds(3);
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absl::Duration bwu_retry_exp_backoff_maximum_delay = absl::Seconds(300);
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// Support sending file and stream payloads starting from a non-zero offset.
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bool enable_send_payload_offset = true;
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// Provide better bookkeeping for bandwidth upgrade initiation. This is
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// necessary to properly support multiple BWU mediums, multiple service, and
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// multiple endpionts.
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bool support_multiple_bwu_mediums = true;
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// Allows the code to change the bluetooth radio state
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bool enable_set_radio_state = false;
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// If the feature is enabled, medium connection will timeout when cannot
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// create connection with remote device in a duration.
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bool enable_connection_timeout = true;
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// Controls to enable or disable to track the status of Bluetooth classic
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// conncetion.
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bool enable_bluetooth_connection_status_track = true;
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// If Hotspot or WFD GO use WinRT API to create the server socket, the
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// StreamSocketListener::BindEndpointAsync() will takes about 11s, so we
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// prefer to use legacy WinSock API to create the server socket and do the
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// binding, which only takes less than 0.1s
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bool use_winsock = true;
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};
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static const FeatureFlags& GetInstance() {
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static const FeatureFlags* instance = new FeatureFlags();
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return *instance;
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}
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const Flags& GetFlags() const ABSL_LOCKS_EXCLUDED(mutex_) {
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absl::ReaderMutexLock lock(&mutex_);
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return flags_;
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}
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static Flags& GetMutableFlagsForTesting() {
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return const_cast<FeatureFlags&>(GetInstance()).flags_;
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}
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private:
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FeatureFlags() = default;
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// MediumEnvironment is testing util class. Use friend class here to enable
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// SetFlags for feature controlling need in test environment.
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friend class MediumEnvironment;
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void SetFlags(const Flags& flags) ABSL_LOCKS_EXCLUDED(mutex_) {
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absl::MutexLock lock(&mutex_);
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flags_ = flags;
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}
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Flags flags_ ABSL_GUARDED_BY(mutex_);
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mutable absl::Mutex mutex_;
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};
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} // namespace nearby
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#endif // PLATFORM_BASE_FEATURE_FLAGS_H_
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