如果存在正在等待的请求，那么令牌将分配给下一个请求，并且将该请求从队列中删除。
If there are requests waiting, the token is assigned to the next request, which is removed from the queue.
如果一个组中的所有端点的所有令牌都已分配出去，那么仲裁流请求将储存在一个fifo队列中，直至有令牌转变成未占用状态。
IF all tokens of all endpoints in the group are assigned, the mediation flow request is stored in a FIFO queue until a token becomes free.
如果队列中的令牌超过20个，颜色将变为红色以指示重大的任务积压。
If more than twenty tokens are in the queue, the color goes to red to indicate a large back-up.
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