ja-netfilter/src/main/java/com/janetfilter/core/commons/DebugInfo.java

package com.janetfilter.core.commons;

import com.janetfilter.core.utils.DateUtils;

public class DebugInfo {
    private static final boolean DEBUG = "1".equals(System.getenv("JANF_DEBUG")) || "1".equals(System.getProperty("janf.debug"));

    public static void output(String content) { // No logger lib required
        if (!DEBUG) {
            return;
        }

        String template = "[%s] %s DEBUG : %s%n";

        StackTraceElement[] traces = new Throwable().getStackTrace();
        String caller = traces.length < 2 ? "UNKNOWN" : traces[1].toString();

        System.out.printf(template, DateUtils.formatNow(), caller, content);
        System.out.flush();
    }
}