ASP.NET Web PDF Document Viewer/Editor Control Library

If you use IIS as a process host, you expose the functionality of your application via the HTTP protocol. IIS provides many features as a host, including many built-in security models, thread pool management, and a flexible model of process isolation via the abstractions of virtual directories and IIS applications. The functionality of IIS can be extended via an Internet Server Application Program Interface (ISAPI) application. An ISAPI application enables third-party code libraries to be configured to extend the functionality of the server. ASP and ASP .NET are both implemented as ISAPI applications. We ll take a look at some others in the sections that follow. As you saw in 7, you can configure Component Services to run in a dedicated process. This happens when the ApplicationActivation attribute is set to Server. This process is named DLLHost.exe, and provides and manages many features of the COM+ infrastructure, including thread pool management, object pools, and interacting with the Distributed Transaction Coordinator for transaction management. Keep in mind that when a COM+ application has its ApplicationActivation attribute set to Library, the services are created in the process of the caller. This is commonly the case when using COM+ from IIS. Setting this attribute to Server is done when you decide to run these components in their own dedicated process. As you ll see in the section that follows, this is also the model in use when calling Component Services via DCOM.

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In this section, we ll examine the need for separating the end user database schema, the data schema, and the data access layer schema Let s begin by defining these terms The end user database schema refers to the database schema to which the end user is mapped The data schema is the schema that contains and owns the application data This is the user that owns the tables in which application data resides This user would also have the privileges of manipulating table data (ie, insert, delete, and update privileges on the tables), and creating and dropping objects such as tables The data access layer schema is the database account that owns the API through which you access the data.

In this chapter, we introduced techniques and tools that you can employ to debug F# programs and automate the execution of unit tests. Since testing and debugging activities relate to the execution of programs, these tools tend to work on the compiled version of the program, relying on additional information such as metadata exposed through the reflection API or program debug database information files generated by compilers. Programming languages such as F# featuring programming abstractions don t map directly to the CLR intermediate language and type system, and as a result, the details of the compilation may surface when using these tools that operate on compiled assemblies. Nevertheless, these are valuable tools for developing large systems. In the next chapter, we ll cover another set of software engineering issues for F# code: library design in the context of F# and .NET.

A .NET application can be created to run as a Windows Service. This enables the operating system to automatically start the process in the background when Windows boots; allows for background execution, even when there is no user logged in; and allows you to control the identity the process is running as. Windows Services are commonly created to listen for incoming Remoting requests or monitor a message queue. This host has many fewer features than IIS or Component Services. It is very much a roll-your-own environment. These are what we commonly think of when we re talking about processes. They re kicked off by a user double-clicking on an EXE, or console applications and Windows applications. While console applications are generally not suited for hosting the types of components you re considering, they can be very handy during development for easily creating a listener application, and making its invocation and activation very visible. We ll take a look at an example of this for a Remoting listener.

Hopefully, after reading the arguments presented in 6, you are convinced of the importance of using a PL/SQL API for the database access layer in your JDBC applications (For a non-Oracle database, you would use the corresponding procedural language layer here for example, for SQL Server, you would use a TransactSQL layer API) It is vital for your application to not lump all of these schemas into one, otherwise you violate both the principle of least privilege and defense in depth For example, consider the case where you have just one user for the data (the tables), the data access layer (the procedures and packages that manipulate the data in the tables), and the end user database account.