@Override
    public boolean offer(final E e) {
        if (!hasRemainedMemory()) {
            rejector.reject(e, this);
            return false;
        }
        return super.offer(e);
    }
determine if there is any remaining free memory.

@return true if has free memory
shenyu-common/src/main/java/org/apache/shenyu/common/concurrent/MemorySafeLinkedBlockingQueue.java