例如，提供者可以在创建请求者要使用的计算器之前添加逻辑，以便确保请求者在一个为访问这个服务付费的组织中。
For example, the provider could add logic that, before creating a calculator for the requestor to use, ensures that the requestor is in an organization that has paid for access to this service.
清单4描述了可以存在于计算器服务会话Bean控制器中的逻辑。
Listing 4 depicts the logic that can exist within the calculator service session bean controller.
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