From 12f2cb0d5869c99f427026d2c43cd4b81d6d6bdb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20S=C3=B6derberg?= <sauilitired@gmail.com>
Date: Sun, 17 May 2020 23:57:40 +0200
Subject: [PATCH] Add a cache uuid service

---
 .../core/uuid/CacheUUIDService.java           | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 Core/src/main/java/com/plotsquared/core/uuid/CacheUUIDService.java

diff --git a/Core/src/main/java/com/plotsquared/core/uuid/CacheUUIDService.java b/Core/src/main/java/com/plotsquared/core/uuid/CacheUUIDService.java
new file mode 100644
index 000000000..81a42bacd
--- /dev/null
+++ b/Core/src/main/java/com/plotsquared/core/uuid/CacheUUIDService.java
@@ -0,0 +1,76 @@
+/*
+ *       _____  _       _    _____                                _
+ *      |  __ \| |     | |  / ____|                              | |
+ *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
+ *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
+ *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
+ *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
+ *                                    | |
+ *                                    |_|
+ *            PlotSquared plot management system for Minecraft
+ *                  Copyright (C) 2020 IntellectualSites
+ *
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.plotsquared.core.uuid;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+import java.util.function.Consumer;
+
+/**
+ * UUID service backed by a Guava Cache
+ */
+public class CacheUUIDService implements UUIDService, Consumer<List<UUIDMapping>> {
+
+    private final Cache<String, UUIDMapping> usernameCache;
+    private final Cache<UUID, UUIDMapping> uuidCache;
+
+    /**
+     * Construct a new Cache UUID service with a maximum number of entries.
+     * Because it stores the mappings in two ways, the actual number
+     * of entries is two times the specified size
+     *
+     * @param size Maximum number of entries
+     */
+    public CacheUUIDService(final int size) {
+        this.usernameCache = CacheBuilder.newBuilder().maximumSize(size).build();
+        this.uuidCache = CacheBuilder.newBuilder().maximumSize(size).build();
+    }
+
+    @Override @NotNull public List<UUIDMapping> getNames(@NotNull final List<UUID> uuids) {
+        final List<UUIDMapping> mappings = new ArrayList<>(uuids.size());
+        mappings.addAll(this.uuidCache.getAllPresent(uuids).values());
+        return mappings;
+    }
+
+    @Override @NotNull public List<UUIDMapping> getUUIDs(@NotNull final List<String> usernames) {
+        final List<UUIDMapping> mappings = new ArrayList<>(usernames.size());
+        mappings.addAll(this.usernameCache.getAllPresent(usernames).values());
+        return mappings;
+    }
+
+    @Override public void accept(final List<UUIDMapping> uuidMappings) {
+        for (final UUIDMapping mapping : uuidMappings) {
+            this.uuidCache.put(mapping.getUuid(), mapping);
+            this.usernameCache.put(mapping.getUsername(), mapping);
+        }
+    }
+
+}