c76170a9db
Reviewers: teon.banek Reviewed By: teon.banek Subscribers: pullbot Differential Revision: https://phabricator.memgraph.io/D1359
72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
#include "watchdog.hpp"
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#include <atomic>
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#include <chrono>
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#include <functional>
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#include <random>
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#include <thread>
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#include "glog/logging.h"
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using std::chrono::milliseconds;
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using std::chrono::steady_clock;
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namespace utils {
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Watchdog::Watchdog(const milliseconds &min_timeout,
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const milliseconds &max_timeout,
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const std::function<void()> &callback, bool blocked)
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: min_timeout_(min_timeout),
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max_timeout_(max_timeout),
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generator_(std::random_device{}()),
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distribution_(min_timeout.count(), max_timeout_.count()),
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callback_(callback),
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draining_(false),
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blocked_(blocked) {
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DCHECK(min_timeout_ <= max_timeout_)
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<< "Min timeout should be less than max timeout";
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Notify();
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thread_ = std::thread([this]() { Run(); });
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}
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Watchdog::~Watchdog() {
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draining_ = true;
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if (thread_.joinable()) {
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thread_.join();
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}
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}
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void Watchdog::Notify() {
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std::lock_guard<std::mutex> guard(mutex_);
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callback_threshold_ =
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steady_clock::now() + milliseconds(distribution_(generator_));
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}
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void Watchdog::Block() { blocked_ = true; }
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void Watchdog::Unblock() {
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if (blocked_) {
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Notify();
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}
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blocked_ = false;
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}
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void Watchdog::Run() {
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while (!draining_) {
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steady_clock::time_point t;
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{
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std::lock_guard<std::mutex> guard(mutex_);
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t = callback_threshold_;
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}
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if (steady_clock::now() > t) {
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if (!blocked_) {
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callback_();
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}
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Notify();
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}
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std::this_thread::sleep_until(t);
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}
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}
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} // namespace utils
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