class CacheOperationStack {
    private int operationCount;

    public boolean isInCacheAction() {
        return operationCount>0;
    }

    public CacheOperationStack pushCacheAction() {
        operationCount++;
        return this;
    }

    public void popCacheAction() {
        checkNotEmpty();
        operationCount--;
    }


    private void checkNotEmpty() {

                    return ++operationCount;
                }
                runOperation(operation);
                operationCount++;
                operation = getNextOperation();
            }
            return operationCount;
        }

        @Nullable
        private T getNextOperation() {
            lock.lock();