MinecraftServerPatch.java

    protected final Queue<FutureTask<?>> j = new java.util.concurrent.ConcurrentLinkedQueue<FutureTask<?>>() {
        // PaperSpigot: Make size() constant-time
        private AtomicInteger cachedSize = new AtomicInteger(0);

        @Override
        public boolean add(FutureTask<?> e) {
            boolean result = super.add(e);
            if (result) {
                cachedSize.incrementAndGet();
            }
            return result;
        }

        @Override
        public FutureTask<?> poll() {
            FutureTask<?> result = super.poll();
            if (result != null) {
                cachedSize.decrementAndGet();
            }
            return result;
        }

        @Override
        public int size() {
            return cachedSize.get();
        }
    }; // Spigot, PAIL: Rename