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/*
* Copyright (c) 2016-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under both the BSD-style license (found in the
* LICENSE file in the root directory of this source tree) and the GPLv2 (found
* in the COPYING file in the root directory of this source tree).
*/
#pragma once
#include <cstdio>
#include <mutex>
namespace pzstd {
constexpr int ERROR = 1;
constexpr int INFO = 2;
constexpr int DEBUG = 3;
constexpr int VERBOSE = 4;
class Logger {
std::mutex mutex_;
FILE* out_;
const int level_;
using Clock = std::chrono::system_clock;
Clock::time_point lastUpdate_;
std::chrono::milliseconds refreshRate_;
public:
explicit Logger(int level, FILE* out = stderr)
: out_(out), level_(level), lastUpdate_(Clock::now()),
refreshRate_(150) {}
bool logsAt(int level) {
return level <= level_;
}
template <typename... Args>
void operator()(int level, const char *fmt, Args... args) {
if (level > level_) {
return;
}
std::lock_guard<std::mutex> lock(mutex_);
std::fprintf(out_, fmt, args...);
}
template <typename... Args>
void update(int level, const char *fmt, Args... args) {
if (level > level_) {
return;
}
std::lock_guard<std::mutex> lock(mutex_);
auto now = Clock::now();
if (now - lastUpdate_ > refreshRate_) {
lastUpdate_ = now;
std::fprintf(out_, "\r");
std::fprintf(out_, fmt, args...);
}
}
void clear(int level) {
if (level > level_) {
return;
}
std::lock_guard<std::mutex> lock(mutex_);
std::fprintf(out_, "\r%79s\r", "");
}
};
}
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