net.quasardb.qdb.Logger Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of jni Show documentation
API for the JNI components of the QuasarDB API for Java. Should not be included directly.
There is a newer version: 3.14.1
package net.quasardb.qdb;

import net.quasardb.qdb.jni.*;
import java.io.File;
import java.lang.reflect.Method;

import org.slf4j.LoggerFactory;
import org.slf4j.Marker;
import org.slf4j.event.Level;
import org.slf4j.event.LoggingEvent;
import org.slf4j.event.EventRecodingLogger;
import org.slf4j.helpers.SubstituteLoggerFactory;
import org.slf4j.helpers.SubstituteLogger;

import java.time.LocalDateTime;
import java.time.Instant;
import java.time.ZoneOffset;

public class Logger
{
    private static final org.slf4j.Logger _delegate = LoggerFactory.getLogger("QdbNative");
    private static final Method logMethodCache = logMethod(_delegate);


    /**
     * Ugly hack, but we need to keep alive at least one session handle, otherwise the native logger
     * service might be destroyed when no handles are left.
     */
    private static Session _keepAlive = new Session();

    protected static class QdbEvent implements LoggingEvent {
        private final Instant ts;
        private final long pid;
        private final long tid;
        private final String msg;
        private final Level level;

        public QdbEvent(Level level, Instant ts, long pid, long tid, String msg) {
            this.level = level;
            this.ts    = ts;
            this.pid   = pid;
            this.tid   = tid;
            this.msg   = msg;
        }

        @Override
        public String getMessage() {
            return this.msg;
        }

        @Override
        public Level getLevel() {
            return this.level;
        }

        // @Override
        // public String getFormat() {
        //     return getFormattedMessage();
        // }

        @Override
        public Marker getMarker() {
            return null;
        }

        @Override
        public Object[] getArgumentArray() {
            return null;
        }

        @Override
        public String toString() {
            return getMessage();
        }

        @Override
        public String getLoggerName() {
            return _delegate.getName();
        }

        @Override
        public String getThreadName() {
            return Long.toString(this.tid);
        }

        @Override
        public Throwable getThrowable() {
            return null;
        }

        @Override
        public long getTimeStamp() {
            return this.ts.toEpochMilli();
        }
    };

    public static Level levelFromNative(int level) {
        switch (level) {
        case qdb_log_level.detailed:
            return Level.TRACE;
        case qdb_log_level.debug:
            return Level.DEBUG;
        case qdb_log_level.info:
            return Level.INFO;
        case qdb_log_level.warning:
            return Level.WARN;
        case qdb_log_level.error:
            return Level.ERROR;
        case qdb_log_level.panic:
            return Level.ERROR;
        };

        return null;
    }

    private static Method logMethod(org.slf4j.Logger l) {
        try {
            return l.getClass().getMethod("log", LoggingEvent.class);
        } catch (Exception e) {
            System.err.println("Fatal error: unable to lookup slf4j log method: \n" + e.toString());
        }

        return null;
    }

    private static Instant toInstant(int year, int month, int day,
                                     int hour, int min, int sec) {
        return LocalDateTime.of(year, month, day,
                                hour, min, sec).toInstant(ZoneOffset.UTC);
    }

    public static void log(int level,
                           int year, int month, int day,
                           int hour, int min, int sec,
                           int pid, int tid,
                           String msg) {
        try {
            logMethodCache.invoke(_delegate,
                                  new QdbEvent(levelFromNative(level),
                                               toInstant(year, month, day,
                                                         hour, min, sec),
                                               pid, tid, msg));
        } catch (Exception e) {
            _delegate.error("Internal error: unable to access slf4j logging method", e);
        }
    }


    public static void trace(String msg) {
        _delegate.trace(msg);
    }

    public static void debug(String msg) {
        _delegate.debug(msg);
    }

    public static void info(String msg) {
        _delegate.info(msg);
    }

    public static void warn(String msg) {
        _delegate.warn(msg);
    }

    public static void error(String msg) {
        _delegate.error(msg);
    }
}