If a connection indication arrives when the queue is full, the connection is refused.
如果连接指令到达之时队列已满，连接将被拒绝。
In a bounded blocking queue, the writer thread also needs to wait if the queue is full.
对于有大小限制的阻塞队列，如果队列满了，写线程也需要等待。
If this queue is full, the application is not allowed to send any more data until the backlog is cleaned up.
如果这个队列满了，就不允许应用程序发送更多数据，直到清理完积压的队列为止。
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