60 lines
2.0 KiB
Java
60 lines
2.0 KiB
Java
package world.bentobox.bentobox.api.user;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.TimeUnit;
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import org.eclipse.jdt.annotation.NonNull;
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import com.google.common.cache.CacheBuilder;
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import com.google.common.cache.CacheLoader;
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import com.google.common.cache.LoadingCache;
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/**
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* Utilities class that helps to avoid spamming the User with potential repeated messages
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* @author Poslovitch, tastybento
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*/
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public class Notifier {
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/**
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* Time in seconds before {@link #notificationCache} removes the entry related to the player.
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*/
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private static final int NOTIFICATION_DELAY = 4;
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private record Notification(String message, long time) {}
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private final LoadingCache<User, Notification> notificationCache = CacheBuilder.newBuilder()
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.expireAfterAccess(NOTIFICATION_DELAY, TimeUnit.SECONDS)
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.maximumSize(500)
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.build(
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new CacheLoader<>() {
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@Override
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public Notification load(@NonNull User user) {
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return new Notification(null, 0);
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}
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}
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);
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/**
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* Sends message to a user only if the message hasn't been sent recently
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* @param user - user
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* @param message - message to send (already translated)
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* @return true if message sent successfully, false it it has been throttled
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*/
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public synchronized boolean notify(User user, String message) {
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try {
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Notification lastNotification = notificationCache.get(user);
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long now = System.currentTimeMillis();
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if (now >= lastNotification.time() + (NOTIFICATION_DELAY * 1000) || !message.equals(lastNotification.message())) {
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notificationCache.put(user, new Notification(message, now));
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user.sendRawMessage(message);
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return true;
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}
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return false;
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} catch (ExecutionException e) {
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return false;
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}
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}
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}
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