FloodProtectedMethod.java

import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.Objects;
 
public class FloodProtectedMethod
{
    private LocalDateTime shallExecutedAfter = null;
    private ChronoUnit chronoUnit;
    private long delay;
 
    public FloodProtectedMethod(ChronoUnit chronoUnit, long delay) {
        this.chronoUnit = chronoUnit;
        this.delay = delay;
    }
 
    public boolean inject(Runnable runnable) {
        LocalDateTime now = LocalDateTime.now();
        synchronized(this) {
            if (Objects.isNull(shallExecutedAfter) || shallExecutedAfter.isBefore(now)) {
                shallExecutedAfter = now.plus(delay, chronoUnit);
                runnable.run();
                return true;
            }
        }
        return false;
    }
}

private final FloodProtectedMethod healProtect = new FloodProtectedMethod(ChronoUnit.SECONDS, 30);
void doHeal() {
    healProtect.inject(() -> NetworkClientHelper.sendCommand("/heal"));
}