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Sources/Nats/ConcurrentQueue.swift

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+// Copyright 2024 The NATS Authors
+// 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.
+
+import NIOConcurrencyHelpers
+
+internal class ConcurrentQueue<T> {
+    private var elements: [T] = []
+    private let lock = NIOLock()
+
+    func enqueue(_ element: T) {
+        lock.lock()
+        defer { lock.unlock() }
+        elements.append(element)
+    }
+
+    func dequeue() -> T? {
+        lock.lock()
+        defer { lock.unlock() }
+        guard !elements.isEmpty else { return nil }
+        return elements.removeFirst()
+    }
+}