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That is to say, method call in the client may not lead to method execution in the same control thread. In design layer, the control principle in run-time layer can be simulated. In nowadays, the object-oriented programming languages all have these abilities, such as C# and Java. The concepts of event and message are frequently used in object-oriented analysis and object-oriented design, even object-oriented systems ~ implementation. In this layer, the communication pattern can be classified into synchronous, asynchronous and authorized.

At last, we should make it clear that connector may contain more than two endpoints. Fig. 5 Connectionof component and connector Experienced architects use architectural tactics to handle necessary nonfunctional requirements. Assuming we need high security, encrypted access channels will be used; if high availability 5 is crucial, redundancy is employed. Several tactics can be combined and construct architectural styles to meet common design problems. Architectural styles define necessary vocabulary for describing sy stem' s runtime structure, and provide the foundation upon which architectural patterns are built, which solve specific problems under a certain context.

After all, it is unsafe to bind the whole enterprise into a single component provider, considering they may increase price, or stop technique support for some reason. The reuse in higher level is the reuse of architecture itself. If you are designer of a company focusing on business information system, you will find it is very similar in the design of the system for other companies, educational organizations or governments. They seem to be the variation on a theme, resulting in the similar architecture.