From 41a0f22468e484dffc0a4432209ac1c5637dbf72 Mon Sep 17 00:00:00 2001
From: TheMode <themode@outlook.fr>
Date: Sat, 24 Apr 2021 21:39:39 +0200
Subject: [PATCH] Prevent Acquired from being used after unlock

---
 .../java/net/minestom/server/acquirable/Acquired.java  | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/main/java/net/minestom/server/acquirable/Acquired.java b/src/main/java/net/minestom/server/acquirable/Acquired.java
index c6f9a8ddd..d43c8bca9 100644
--- a/src/main/java/net/minestom/server/acquirable/Acquired.java
+++ b/src/main/java/net/minestom/server/acquirable/Acquired.java
@@ -1,5 +1,6 @@
 package net.minestom.server.acquirable;
 
+import net.minestom.server.utils.validate.Check;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -12,6 +13,8 @@ public class Acquired<T> {
     private final boolean locked;
     private final ReentrantLock lock;
 
+    private boolean unlocked;
+
     protected Acquired(@NotNull T value,
                        boolean locked, @Nullable ReentrantLock lock) {
         this.value = value;
@@ -20,13 +23,20 @@ public class Acquired<T> {
     }
 
     public @NotNull T get() {
+        checkLock();
         return value;
     }
 
     public void unlock() {
+        checkLock();
+        this.unlocked = true;
         if (!locked)
             return;
         Acquisition.acquireLeave(lock);
     }
 
+    private void checkLock() {
+        Check.stateCondition(unlocked, "The acquired element has already been unlocked!");
+    }
+
 }