Debouncer防抖代码

Debouncer类

import java.util.concurrent.*;

public class Debouncer {
    private final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
    private final ConcurrentHashMap<Object, Future<?>> delayedMap = new ConcurrentHashMap<>();

    public void debounce(final Object key, final Runnable runnable, long delay, TimeUnit unit) {
        if (!delayedMap.containsKey(key)) {
            delayedMap.putIfAbsent(key, scheduler.schedule(() -> {
                try {
                    runnable.run();
                } finally {
                    delayedMap.remove(key);
                }
            }, delay, unit));
        }
    }

    public void shutdown() {
        scheduler.shutdownNow();
    }

}

测试

    @Test
    public void debouncer() throws InterruptedException {
        Debouncer debouncer = new Debouncer();
        for (int i = 0; i < 10; i++) {
            System.out.println("start---------" + System.currentTimeMillis());
            debouncer.debounce("test_key",
                    () -> {System.out.println("run ----------" + System.currentTimeMillis());},
                    1, TimeUnit.SECONDS);
        }
        Thread.sleep(8000);
    }