基础算法：使用找到的第一个未占用的令牌，通过“逐一比照”的方式在端点之间实现一些平衡。
Basic — the first free token found is used, with "round robin" to get some balancing over the endpoints.
与其把网站的运营建立在自己的服务器上，这些公司更愿意租用亚马逊的服务器，使用亚马逊未占用的，高度复杂的服务处理能力。
Rather than hosting their sites on their own servers, these customers turn to Amazon, which essentially rents out its unused -- and highly intricate -- server capacity.
如果找到未占用的令牌，其状态将更改为“assigned”并且将相应端点的URL返回到仲裁流，后者调用使用所提供的URL的Web服务。
If a free token is found, its status is changed to "assigned" and the URL of the corresponding endpoint is returned to the mediation flow, which invokes the Web service using the provided URL.
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.
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