ASP.NET Web PDF Document Viewer/Editor Control Library

Summary

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elivering content and applications via web browsers is one of the most important aspects of modern software development. In this chapter, we examine how you can build web applications using F#. The topics we cover are as follows: Serving static files and dynamic content by directly responding to HTTP requests Using the ASP.NET framework to develop page-based, server-side web applications that use input controls and read data from a database using F# Linq A walk-through of the ASP.NET essentials: web forms and site organization, a discussion of the various types of server controls (web and HTML), user control creation, and web application configuration and debugging The fundamentals of the ASP.NET event model: page and control events, page life cycle, posting information from a page (postback and cross-page posting), and maintaining state A look at techniques to build client-side web applications, including the use of the F# Web Tools open source project Consuming web services to deliver programmatic services via web connections

In this chapter, we took a look at the Oracle memory structure. We started at the process and session level, examining the PGA and UGA and their relationship. We saw how the mode in which we connect to Oracle dictates how memory is organized. A dedicated server connection implies more memory used in the server process than under a shared server connection, but that use of a shared server connection implies there will be the need for a significantly larger SGA. Then we discussed the main structures of the SGA itself. We discovered the differences between the shared pool and the large pool, and looked at why we might want a large pool to "save" our shared pool. We covered the Java pool and how it is used under various conditions, and we looked at the block buffer cache and how that can be subdivided into smaller, more focused pools. Now we are ready to move on to the physical processes that make up the rest of an Oracle instance.

We ve reached the last piece of the architecture puzzle. We ve investigated the database and the set of physical files that constitute a database. In covering the memory used by Oracle, we ve looked at one half of an instance. The last remaining architectural issue to cover is the set of processes that constitute the other half of the instance. Each process in Oracle will perform a particular task or set of tasks, and each will have internal memory (PGA memory) allocated by it to perform its job. An Oracle instance has three broad classes of processes: Server processes: These perform work based on a client s request. We have already looked at dedicated and shared servers to some degree. These are the server processes. Background processes: These are the processes that start up with the database and perform various maintenance tasks, such as writing blocks to disk, maintaining the online redo log, cleaning up aborted processes, maintaining Automatic Workload Repository (AWR) and so on. Slave processes: These are similar to background processes, but they are processes that perform extra work on behalf of either a background or a server process.

When you point your browser at a web page or call a web service from your application, you are effectively issuing one or more requests (commands) to a web (HTTP) server. HTTP commands are simple text-based instructions that are automatically generated by your web browser. For instance, when your browser goes to a particular URL, it does the following: 1. Requests the page from the web server and waits for the response 2. Analyzes it for further content to be fetched (images, for example) and issues the appropriate requests if necessary 3. Displays the results and executes any dynamic scripts and content contained in the page

Some of these processes, such as the database block writer (DBWn) and the log writer (LGWR), have cropped up already, but here we ll take a closer look at the function of each, and what each does and why.

Responses can be a verbatim copy of a resource found on the web server (most often a static file such as an image, a style sheet, or a media file) or can be generated on the fly. In this section, we show how you can use F# to serve content directly. Listing 14-1 shows a simple web server written directly in F#. Listing 14-1. A Simple Web Server #light open open open open open open System.Net System.Net.Sockets System.IO System.Text.RegularExpressions Microsoft.FSharp.Text.Printf System.Text