Java 8 elapsed time logger

ElapsedTimeLogger.java

package org.example.utils;

import lombok.extern.slf4j.Slf4j;

import java.util.function.Supplier;

/**
 * Log elapsed time for a function.
 *
 * Usage:
 *
 *     import static org.example.utils.ElapsedTimeLogger.logElapsedTime;
 *
 *     ResponseType response = logElapsedTime(() -> myFunction(....), "op.name");
 *          
 */
@Slf4j
public class ElapsedTimeLogger {

    public static <T> T logElapsedTime(Supplier<T> r, String name) {
        long before = System.currentTimeMillis();
        T result = null;
        try {
            log.debug("timing operation {}", name);
            result = r.get();
            log.info("elapsedTime: {}, operation: {}, status: ok", System.currentTimeMillis() - before, name);
        } catch (Throwable t) {
            log.info("elapsedTime: {}, operation: {}, status: failed, exception: {}", System.currentTimeMillis() - before, name, t);
            throw t;
        }
        return result;
    }
}