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CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
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Connectivity
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Connectivity describes the types and speeds of connection mechanisms that will be used to operate the system. It s often assumed that the user will have a persistent connection to your application, and that a broken connection is the explicit result of some action, such as closing the browser. But what if the user is connected via a cell-phone frequency and loses the connection because he traveled through a bad coverage area What if the user was in the midst of typing a large amount of data and then loses the connection Have you considered any facilities for retrieving that data (i.e., Auto Save for the Web) Your application may need to function effectively through various types of connections, including dial-up, low-speed wireless (cell-phone frequency), high-speed wireless (WiFi, WiMax), broadband, Digital Subscriber Line (DSL), etc. Thus, the system design must explicitly consider how each scenario will be handled technically, and how the user is impacted by loss of connectivity.
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Other Nonfunctional Requirements
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There are many other requirements that may be relevant to your system. We summarize some of the others that may come up in Table 1-3. Table 1-3. Summary of Other Quality Attributes
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Requirement
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Usability
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Meaning In Life
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Often not thought of as an architecture requirement, as it pertains more to the user interface design than to the nonfunctional requirements. However, requirements of usability can definitely affect your system architecture. For example, if the user makes a long running request for data, and there s a usability requirement that any operation taking more than two seconds should be cancelable by the user, you must account for this (asynchrony) in your architecture. This metric has really come into its own over the last couple of years. More and more IT departments are drawing a line in the sand, saying if we can t maintain it, you can t put it into production. Some of the pain of DLL Hell and Distributed Component Object Model (DCOM) account for this metric s meteoric rise. Chances are you ll need to consider this metric for any substantial enterprise development. Products such as Microsoft s MOM and Team System offerings attempt to address this specifically. This metric is usually considered a subset of availability. It describes the system s capability to recover from fault or failure, which could threaten the system s availability. Tactics include automatic failover (clustering and load balancing), having a spare on hand, and systems that implement the ACID rules of transactions. In addition to deployment issues, this attribute can also pertain to tracing and auditing. When something goes wrong for a user, can the app re-create the data If there s an attack, can the app recover and restore the data This is the attribute that captures whether or not you can repeat processes from one environment to another. Database scripts are a good example of this metric. If the database has been created using a high-level GUI tool, you have no guarantee that the database will look the same in development, testing, staging, and production. Component installation is another process that should be designed for repeatability as well.
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Continued
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Manageability
Recoverability
Repeatability
CHAPTER 1 OVERVIEW OF .NET APPLICATION ARCHITECTURE
Table 1-3. Continued
Requirement
Interoperability
Meaning In Life
This attribute is constantly increasing in importance as Enterprises come to realize the time, money, and churn they spend on integrating existing systems, packages, platforms, and technologies. The new buzzword around these technologies is Service Oriented Architecture (SOA). SOAP WSDL, , and XML Schema have been combined to offer a platform, language, and transport-neutral protocol solution to this problem, called Web Services. This provides a platform for SOA, although it s not the only one. Within .NET, you have interoperability considerations if you need to use legacy COM applications, be it an existing code base, a vendor-supplied package, or leveraging Office or other current COM products. Data access is another example where there s a common need for interop. .NET provides managed providers of ODBC and OLE DB, and the Data Access Application Block can use these providers seamlessly. This pertains to the system s maturity, fault tolerance, recoverability, and duration of product relevance. This important metric pertains to the system s capability to have engineers verify that it s working correctly. To do this, first and foremost, the system must be defined with a requirements document. Without requirements, testers have no way to verify the system is working correctly. When a developer is finished with a component, she hands it off to the tester and tells him what she programmed it to do. Depending on the developer s understanding of the requirements, this may or may not be what it s supposed to do. There are strategies you can employ to test the functionality of components in isolation from one another, as well. These include record/playback, separating the interface from the implementation, and creating specialized test harnesses to fully exercise all of the dynamics of a component. Stubs and feeds of domains of data can also be used. These stubs are also sometimes called Mock Objects. This is a facet of performance, availability, and, also very likely, maintainability. This is a description of the state of an application over time, or how static its state is over time. An example of where stability measurements are important is an application that queries a database table that s poorly indexed. During testing, the row count is low, so load tests perform swimmingly. Over time in production, however, the row count increases, causing the query s performance to degrade, resulting in an unstable system. A memory leak is an example of another possible stability problem. This attribute pertains not just to functional requirements, but also to the intersection of those requirements with the nonfunctional requirements that have been identified as relevant and important to the system. This pertains to the system s adaptability, installability, capability to play nicely with others, ease of replacement, and platform independence. This requirement can become important if you re working for an independent software vendor (ISV) who wants to sell their product to run on several platforms. You can see this metric come into play in the application or the database space. Programming to the interfaces of ADO.NET is a way to achieve database portability within .NET. The Java Virtual Machine (JVM) and the Common Language Runtime (CLR) are examples of achieving platform portability for your application code. This is a superset of other quality attributes, including availability, reliability, maintainability, recoverability, security, and usability. Aspects of all of these attributes can be aggregated to describe the architectural solution for system dependability.
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