IBM BS029ML Self Help Guide - Page 27
The System Context Diagram, System Component / Roles, Description
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The following recommendations are made with regards to the selection of the most appropriate connectivity technology: Use Web Services when portability or interface standardization is a prime concern. Use Messaging when high QoS constraints and loose coupling or asynchronous invocation is needed. Use JCA when high QoS constraints and synchronous invocation are needed. 2.1.4 The System Context Diagram If there is one diagram that can simplistically represent a WebSphere Portal Server implementation, or for that matter any other generic software implementation, then it is the System Context Diagram, as shown in Figure 2-1. Authenticated Users PDM Anonymous Users Administrators Content Authors Content Developers Portal Implementation WCM TAM System A System B .... .... .... Figure 2-1 System Context Diagram Figure 2-1 illustrates the various system components and most significant roles of the system. Besides that, it helps to identify in high level terms the systems to which a deployment interfaces. Table 2-2 further explains the various system components and roles. Table 2-2 System Context Diagram System Component / Roles Description Anonymous Users An Anonymous User has access to the limited external Portal pages, but never signs into the Portal. Anonymous users can become authenticated users by logging in. Authenticated Users An Authenticated User is a user that has logged into the Portal during their current user session. Chapter 2. Architecture and planning 13