优化System.currentTimeMillis()获取时间的性能问题

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优化System.currentTimeMillis()获取时间的性能问题 

import org.apache.commons.lang3.concurrent.BasicThreadFactory;import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;/*** @Description: 优化System.currentTimeMillis()获取时间的性能问题* @author: Be.insighted* @create: 2024/9/3 10:02* @since 1.0.0*/public class SystemClockUtil {private final long period;private final AtomicLong now;private SystemClockUtil(long period) {this.period = period;this.now = new AtomicLong(System.currentTimeMillis());scheduleClockUpdating();}private static class InstanceHolder {public static final SystemClockUtil INSTANCE = new SystemClockUtil(10);}private static SystemClockUtil instance() {return InstanceHolder.INSTANCE;}private void scheduleClockUpdating() {ScheduledExecutorService scheduler = new ScheduledThreadPoolExecutor(1,new BasicThreadFactory.Builder().namingPattern("System-Clock-%d").daemon(true).build());scheduler.scheduleAtFixedRate(() -> now.set(System.currentTimeMillis()), period, period, TimeUnit.MILLISECONDS);}private long currentTimeMillis() {return now.get();}public static long now() {return instance().currentTimeMillis();}
}

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