Async: New lock type.

Extremely useful to guarantee safety :^)

Author: e3ndr

async/src/main/java/co/casterlabs/commons/async/LockableResource.java

@@ -0,0 +1,46 @@
+/* 
+Copyright 2025 Casterlabs
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and limitations under the License.
+*/
+package co.casterlabs.commons.async;
+
+import java.util.concurrent.locks.ReentrantLock;
+
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public class LockableResource<T> {
+    private final ReentrantLock lock = new ReentrantLock();
+
+    private volatile T resource;
+
+    public void set(T resource) {
+        this.lock.lock();
+        try {
+            this.resource = resource;
+        } finally {
+            this.lock.unlock();
+        }
+    }
+
+    public T acquire() {
+        this.lock.lock();
+        return this.resource;
+    }
+
+    public T acquireUnsafe() {
+        return this.resource;
+    }
+
+    public void release() {
+        this.lock.unlock();
+    }
+
+}