The lock window prevents two queue readers from processing the same queue item.

锁定窗口能够阻止两个队列读取器同时处理同一个队列项。

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You can see from Listing 8 that you just need an tag to make conditional decisions before processing each production item according to its type.

从清单8可以看到，在根据生产产品的类型处理每个产品前，您仅需要一个标记来作出条件决策。

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For example, assume you are processing a very large order that will deplete the stock of that item.

例如，假设您正在处理一个很大的订单，要耗尽该项的库存。

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Merchants issue a refund in an amount equaling the full purchase price when an item is returned, but the retailer may be taking a loss on such transactions because card processing fees are not refunded when transactions are reversed.

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