@Override
    public boolean remove(final Object o) {
        final boolean success = super.remove(o);
        if (success) {
            memoryLimiter.release(o);
        }
        return success;
    }
get the current remain memory.

@return the current remain memory
shenyu-common/src/main/java/org/apache/shenyu/common/concurrent/MemoryLimitedLinkedBlockingQueue.java