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logger initial commit
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examples/c++/logger.cxx
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17
examples/c++/logger.cxx
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#include "upm_logger.hpp"
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using namespace upm;
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int main()
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{
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UPM_LOGGER::getLogLevel() = LOG_ERROR;
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UPM_LOGGER().get(LOG_WARNING) << "a loop with 4 iterations";
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for (int i = 0; i < 4; ++i) {
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UPM_LOGGER().get(LOG_DEBUG) << "i = " << i;
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}
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return 0;
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}
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84
include/upm_logger.hpp
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include/upm_logger.hpp
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#pragma once
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#include <sstream>
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#include <string>
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#include <chrono>
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#include <stdio.h>
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namespace upm {
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enum UpmLogLevel {
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LOG_ERROR,
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LOG_WARNING,
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LOG_INFO,
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LOG_DEBUG,
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NA
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};
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static const std::string logLevelNames[] = {
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"ERROR",
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"WARNING",
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"INFO",
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"DEBUG",
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""
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};
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class UPM_LOGGER {
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public:
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UPM_LOGGER();
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virtual ~UPM_LOGGER();
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std::ostringstream& get(UpmLogLevel level = LOG_INFO);
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static UpmLogLevel& getLogLevel();
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protected:
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std::ostringstream os;
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private:
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UPM_LOGGER(const UPM_LOGGER&);
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UPM_LOGGER& operator=(const UPM_LOGGER&);
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private:
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UpmLogLevel logLevel;
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public:
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static const std::string& getLogLevelName(UpmLogLevel level)
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{
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if (level < LOG_ERROR || level >= NA) {
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return NULL;
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}
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return logLevelNames[level];
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}
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};
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UPM_LOGGER::UPM_LOGGER() {}
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UpmLogLevel& UPM_LOGGER::getLogLevel()
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{
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static UpmLogLevel reportingLevel = LOG_DEBUG;
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return reportingLevel;
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}
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std::ostringstream& UPM_LOGGER::get(UpmLogLevel level)
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{
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using namespace std::chrono;
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os << "- " << duration_cast<milliseconds>
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(system_clock::now().time_since_epoch()).count();
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os << " " << getLogLevelName(level) << ": ";
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os << std::string(level > LOG_DEBUG ? level - LOG_DEBUG : 0, '\t');
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logLevel = level;
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return os;
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}
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UPM_LOGGER::~UPM_LOGGER()
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{
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if (logLevel >= UPM_LOGGER::getLogLevel()) {
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os << std::endl;
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fprintf(stderr, "%s", os.str().c_str());
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fflush(stderr);
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}
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}
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}
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