在第1部分，我们介绍了事务处理监视器(TPM)这个概念，TPM是一个程序，它代表应用程序协调分布式事务的执行。
In Part 1, we introduced the concept of a transaction processing monitor (TPM), a program that coordinates the execution of distributed transactions on behalf of an application.
MQTT客户机的语义比JMS简单很多，因为没有会话、用户、生产者或事务处理的应用程序控制这样的概念。
The MQTT client has much simpler semantics than JMS because there is no concept of sessions, consumers, producers, or application control of transactions.
我们通过逆转它们的用例事务处理将两个系统间的机器接口概念化。
We conceptualize machine interfaces between two systems by reversing the transactions of their use cases.
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