Misc Utils

paper-api/src/main/java/com/destroystokyo/paper/utils/CachedSizeConcurrentLinkedQueue.java

@@ -0,0 +1,37 @@
+package com.destroystokyo.paper.utils;
+
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.atomic.LongAdder;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+@NullMarked
+@ApiStatus.Internal
+public class CachedSizeConcurrentLinkedQueue<E> extends ConcurrentLinkedQueue<E> {
+
+    private final LongAdder cachedSize = new LongAdder();
+
+    @Override
+    public boolean add(final E e) {
+        final boolean result = super.add(e);
+        if (result) {
+            this.cachedSize.increment();
+        }
+        return result;
+    }
+
+    @Override
+    public @Nullable E poll() {
+        final E result = super.poll();
+        if (result != null) {
+            this.cachedSize.decrement();
+        }
+        return result;
+    }
+
+    @Override
+    public int size() {
+        return this.cachedSize.intValue();
+    }
+}