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b0765887fc
Summary: I found the logic for whether the config should be reloaded unnecessarily complicated, so reduce it to deciding whether to reload or not. This removes the need to acquire a write lock in autoreload's common case. Reviewed By: wez Differential Revision: D17847699 fbshipit-source-id: 50fee1aac15cc8f896333c93459fea6510646600
53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <chrono>
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#include <memory>
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#include <folly/Synchronized.h>
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#include "eden/fs/config/gen-cpp2/eden_config_types.h"
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namespace facebook {
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namespace eden {
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class EdenConfig;
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/**
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* An interface that defines how to obtain a possibly reloaded EdenConfig
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* instance.
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*/
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class ReloadableConfig {
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public:
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explicit ReloadableConfig(std::shared_ptr<const EdenConfig> config);
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~ReloadableConfig();
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/**
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* Get the EdenConfig data.
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*
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* The config data may be reloaded from disk depending on the value of the
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* reload parameter.
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*/
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std::shared_ptr<const EdenConfig> getEdenConfig(
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ConfigReloadBehavior reload = ConfigReloadBehavior::AutoReload);
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private:
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struct ConfigState {
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explicit ConfigState(const std::shared_ptr<const EdenConfig>& config)
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: config{config} {}
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std::shared_ptr<const EdenConfig> config;
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};
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folly::Synchronized<ConfigState> state_;
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std::atomic<std::chrono::steady_clock::time_point::rep> lastCheck_;
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};
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} // namespace eden
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} // namespace facebook
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