Use Cache

application/src/main/java/org/togetherjava/tjbot/features/basic/Starboard.java

@@ -1,5 +1,7 @@
 package org.togetherjava.tjbot.features.basic;
 
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
 import net.dv8tion.jda.api.EmbedBuilder;
 import net.dv8tion.jda.api.Permission;
 import net.dv8tion.jda.api.entities.Guild;
@@ -20,6 +22,7 @@
 import org.togetherjava.tjbot.features.EventReceiver;
 
 import java.util.Optional;
+import java.util.concurrent.TimeUnit;
 
 import static org.togetherjava.tjbot.db.generated.tables.StarboardMessages.STARBOARD_MESSAGES;
 
@@ -29,17 +32,23 @@ public class Starboard extends ListenerAdapter implements EventReceiver {
  private final StarboardConfig config;
  private final Database database;
 
+ private final Cache<Long, Object> messageCache;
+
  public Starboard(Config config, Database database) {
  this.config = config.getStarboard();
  this.database = database;
+ this.messageCache = Caffeine.newBuilder()
+ .maximumSize(100)
+ .expireAfterAccess(24, TimeUnit.HOURS) // TODO make these constants
+ .build();
  }
 
  @Override
  public void onMessageReactionAdd(@NotNull MessageReactionAddEvent event) {
  String emojiName = event.getEmoji().asCustom().getName();
  Guild guild = event.getGuild();
- if (shouldIgnoreMessage(emojiName, guild, event.getGuildChannel(),
-  event.getMessageIdLong())) {
+ long messageId = event.getMessageIdLong();
+ if (shouldIgnoreMessage(emojiName, guild, event.getGuildChannel(), messageId)) {
  return;
  }
  Optional<TextChannel> starboardChannel = getStarboardChannel(guild);
@@ -48,8 +57,8 @@ public void onMessageReactionAdd(@NotNull MessageReactionAddEvent event) {
  config.channelPattern());
  return;
  }
- database.write(context -> context.newRecord(STARBOARD_MESSAGES)
-  .setMessageId(event.getMessageIdLong()));
+ database.write(context -> context.newRecord(STARBOARD_MESSAGES).setMessageId(messageId));
+ messageCache.put(messageId, new Object());
  event.retrieveMessage()
  .flatMap(
  message -> starboardChannel.orElseThrow().sendMessageEmbeds(formEmbed(message)))
@@ -60,6 +69,7 @@ private boolean shouldIgnoreMessage(String emojiName, Guild guild, GuildChannel
  long messageId) {
  return !config.emojiNames().contains(emojiName)
  || !guild.getPublicRole().hasPermission(channel, Permission.VIEW_CHANNEL)
+ || messageCache.getIfPresent(messageId) != null
  || database
  .read(context -> context.fetchExists(context.selectFrom(STARBOARD_MESSAGES)
  .where(STARBOARD_MESSAGES.MESSAGE_ID.eq(messageId))));