com.alibaba.ttl.threadpool.agent.internal.logging.Logger Maven / Gradle / Ivy

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package com.alibaba.ttl.threadpool.agent.internal.logging;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.logging.Level;

public abstract class Logger {
    private static volatile int loggerImplType = -1;

    public static void setLoggerImplType(String type) {
        if (loggerImplType != -1) {
            throw new IllegalStateException("TTL logger implementation type is already set! type = " + loggerImplType);
        }

        if ("STDERR".equalsIgnoreCase(type)) {
            loggerImplType = 0;
        } else if ("STDOUT".equalsIgnoreCase(type)) {
            loggerImplType = 1;
        } else {
            loggerImplType = 0;
        }
    }

    public static Logger getLogger(Class clazz) {
        if (loggerImplType == -1) {
            throw new IllegalStateException("TTL logger implementation type is NOT set!");
        }

        switch (loggerImplType) {
            case 1:
                return new StdOutLogger(clazz);
            default:
                return new StdErrorLogger(clazz);
        }
    }

    final Class logClass;

    private Logger(Class logClass) {
        this.logClass = logClass;
    }

    public void info(String msg) {
        log(Level.INFO, msg, null);
    }

    public abstract void log(Level level, String msg, Throwable thrown);

    private static class StdErrorLogger extends Logger {
        StdErrorLogger(Class clazz) {
            super(clazz);
        }

        @Override
        public void log(Level level, String msg, Throwable thrown) {
            if (level == Level.SEVERE) {
                final String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
                System.err.printf("%s %s [%s] %s: %s%n", time, Thread.currentThread().getName(), logClass.getSimpleName(), level, msg);
                if (thrown != null) thrown.printStackTrace();
            }
        }
    }

    private static class StdOutLogger extends Logger {
        StdOutLogger(Class clazz) {
            super(clazz);
        }

        @Override
        public void log(Level level, String msg, Throwable thrown) {
            final String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
            System.out.printf("%s %s [%s] %s: %s%n", time, Thread.currentThread().getName(), logClass.getSimpleName(), level, msg);
            if (thrown != null) thrown.printStackTrace(System.out);
        }
    }
}