Java tutorial
/** * This is free and unencumbered software released into the public domain. * * Anyone is free to copy, modify, publish, use, compile, sell, or * distribute this software, either in source code form or as a compiled * binary, for any purpose, commercial or non-commercial, and by any * means. * * In jurisdictions that recognize copyright laws, the author or authors * of this software dedicate any and all copyright interest in the * software to the public domain. We make this dedication for the benefit * of the public at large and to the detriment of our heirs and * successors. We intend this dedication to be an overt act of * relinquishment in perpetuity of all present and future rights to this * software under copyright law. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * For more information, please refer to <http://unlicense.org/> */ package com.imaginarycode.minecraft.redisbungee.util; import com.google.common.base.Charsets; import com.google.common.collect.ImmutableMap; import com.google.common.collect.Iterables; import com.imaginarycode.minecraft.redisbungee.RedisBungee; import lombok.Getter; import lombok.NonNull; import lombok.RequiredArgsConstructor; import net.md_5.bungee.api.ProxyServer; import redis.clients.jedis.Jedis; import redis.clients.jedis.Pipeline; import redis.clients.jedis.exceptions.JedisException; import java.util.*; import java.util.concurrent.ConcurrentHashMap; import java.util.logging.Level; import java.util.regex.Pattern; @RequiredArgsConstructor public final class UUIDTranslator { private static final Pattern UUID_PATTERN = Pattern .compile("[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}"); private static final Pattern MOJANGIAN_UUID_PATTERN = Pattern.compile("[a-fA-F0-9]{32}"); private final RedisBungee plugin; private final Map<String, CachedUUIDEntry> nameToUuidMap = new ConcurrentHashMap<>(128, 0.5f, 4); private final Map<UUID, CachedUUIDEntry> uuidToNameMap = new ConcurrentHashMap<>(128, 0.5f, 4); private void addToMaps(String name, UUID uuid) { // This is why I like LocalDate... // Cache the entry for three days. Calendar calendar = Calendar.getInstance(); calendar.add(Calendar.DAY_OF_MONTH, 3); // Create the entry and populate the local maps CachedUUIDEntry entry = new CachedUUIDEntry(name, uuid, calendar); nameToUuidMap.put(name.toLowerCase(), entry); uuidToNameMap.put(uuid, entry); } public final UUID getTranslatedUuid(@NonNull String player, boolean expensiveLookups) { // If the player is online, give them their UUID. // Remember, local data > remote data. if (ProxyServer.getInstance().getPlayer(player) != null) return ProxyServer.getInstance().getPlayer(player).getUniqueId(); // Check if it exists in the map CachedUUIDEntry cachedUUIDEntry = nameToUuidMap.get(player.toLowerCase()); if (cachedUUIDEntry != null) { if (!cachedUUIDEntry.expired()) return cachedUUIDEntry.getUuid(); else nameToUuidMap.remove(player); } // Check if we can exit early if (UUID_PATTERN.matcher(player).find()) { return UUID.fromString(player); } if (MOJANGIAN_UUID_PATTERN.matcher(player).find()) { // Reconstruct the UUID return UUIDFetcher.getUUID(player); } // If we are in offline mode, UUID generation is simple. // We don't even have to cache the UUID, since this is easy to recalculate. if (!plugin.getProxy().getConfig().isOnlineMode()) { return UUID.nameUUIDFromBytes(("OfflinePlayer:" + player).getBytes(Charsets.UTF_8)); } // Let's try Redis. try (Jedis jedis = plugin.getPool().getResource()) { String stored = jedis.hget("uuid-cache", player.toLowerCase()); if (stored != null) { // Found an entry value. Deserialize it. CachedUUIDEntry entry = RedisBungee.getGson().fromJson(stored, CachedUUIDEntry.class); // Check for expiry: if (entry.expired()) { jedis.hdel("uuid-cache", player.toLowerCase()); // Doesn't hurt to also remove the UUID entry as well. jedis.hdel("uuid-cache", entry.getUuid().toString()); } else { nameToUuidMap.put(player.toLowerCase(), entry); uuidToNameMap.put(entry.getUuid(), entry); return entry.getUuid(); } } // That didn't work. Let's ask Mojang. if (!expensiveLookups || !ProxyServer.getInstance().getConfig().isOnlineMode()) return null; Map<String, UUID> uuidMap1; try { uuidMap1 = new UUIDFetcher(Collections.singletonList(player)).call(); } catch (Exception e) { plugin.getLogger().log(Level.SEVERE, "Unable to fetch UUID from Mojang for " + player, e); return null; } for (Map.Entry<String, UUID> entry : uuidMap1.entrySet()) { if (entry.getKey().equalsIgnoreCase(player)) { persistInfo(entry.getKey(), entry.getValue(), jedis); return entry.getValue(); } } } catch (JedisException e) { plugin.getLogger().log(Level.SEVERE, "Unable to fetch UUID for " + player, e); } return null; // Nope, game over! } public final String getNameFromUuid(@NonNull UUID player, boolean expensiveLookups) { // If the player is online, give them their UUID. // Remember, local data > remote data. if (ProxyServer.getInstance().getPlayer(player) != null) return ProxyServer.getInstance().getPlayer(player).getName(); // Check if it exists in the map CachedUUIDEntry cachedUUIDEntry = uuidToNameMap.get(player); if (cachedUUIDEntry != null) { if (!cachedUUIDEntry.expired()) return cachedUUIDEntry.getName(); else uuidToNameMap.remove(player); } // Okay, it wasn't locally cached. Let's try Redis. try (Jedis jedis = plugin.getPool().getResource()) { String stored = jedis.hget("uuid-cache", player.toString()); if (stored != null) { // Found an entry value. Deserialize it. CachedUUIDEntry entry = RedisBungee.getGson().fromJson(stored, CachedUUIDEntry.class); // Check for expiry: if (entry.expired()) { jedis.hdel("uuid-cache", player.toString()); // Doesn't hurt to also remove the named entry as well. // TODO: Since UUIDs are fixed, we could look up the name and see if the UUID matches. jedis.hdel("uuid-cache", entry.getName()); } else { nameToUuidMap.put(entry.getName().toLowerCase(), entry); uuidToNameMap.put(player, entry); return entry.getName(); } } if (!expensiveLookups || !ProxyServer.getInstance().getConfig().isOnlineMode()) return null; // That didn't work. Let's ask Mojang. This call may fail, because Mojang is insane. String name; try { List<String> nameHist = NameFetcher.nameHistoryFromUuid(player); name = Iterables.getLast(nameHist, null); } catch (Exception e) { plugin.getLogger().log(Level.SEVERE, "Unable to fetch name from Mojang for " + player, e); return null; } if (name != null) { persistInfo(name, player, jedis); return name; } return null; } catch (JedisException e) { plugin.getLogger().log(Level.SEVERE, "Unable to fetch name for " + player, e); return null; } } public final void persistInfo(String name, UUID uuid, Jedis jedis) { addToMaps(name, uuid); String json = RedisBungee.getGson().toJson(uuidToNameMap.get(uuid)); jedis.hmset("uuid-cache", ImmutableMap.of(name, json, uuid.toString(), json)); } public final void persistInfo(String name, UUID uuid, Pipeline jedis) { addToMaps(name, uuid); String json = RedisBungee.getGson().toJson(uuidToNameMap.get(uuid)); jedis.hmset("uuid-cache", ImmutableMap.of(name, json, uuid.toString(), json)); } @RequiredArgsConstructor @Getter private class CachedUUIDEntry { private final String name; private final UUID uuid; private final Calendar expiry; public boolean expired() { return Calendar.getInstance().after(expiry); } } }