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scaled back and simpler solution that is still very powerful, but does not have all the advanced configuration options or complexities of the Enterprise Library. Log4Net is also a popular logging solution, as are many other solutions found on mainstream development sites and blogs on the Internet. Links to these products are provided under the Links section of the example application (in the Source Code area of the Apress website), or you can opt to search for the product using a search engine. Ultimately, you must decide which tool to use based on your personal preference and project environment. In some situations, the Enterprise Library may be overkill or present too much of a learning curve. For other situations, the Exception Management Application Block may not provide enough configuration options. And there could always be a spectacular feature in another tool that is so well suited for your particular need that it compels you to use that tool over another one. Regardless of which tool you opt to use, each is likely to have its own proprietary configuration options and extensibility framework. You ll have to consult the documentation for specific implementation guidelines because I cannot cover all of them in this text. In the example that follows, you ll look at a custom exception logging implementation that demonstrates the basics of exception logging. You can then apply what you learn to whichever tool you decide to use. Also know that the exception logging classes presented in the upcoming example can be reused inside of another logging solution if you so desire, or they can act as a starting point for your own implementation.

Writes the log messages to a specified file. Writes the log messages to files and rolls the files based on size. Writes log messages to a file and rolls the file based on date and time.

drawFrame(); return 1; }

In the following example, you are creating a series of classes to help save exception logging information to a database and building a web-based interface for reviewing those exceptions. Table 2-2 provides a breakdown of the items in the example and their purposes.

Object representation of the exception information stored in the database. Also includes loading and saving routines for exception data. Maintains a list of ExceptionLog objects. Also includes loading routines for listoriented operations. Contains the Log function, which can be used to save exception information to the database. This class is responsible for populating ExceptionLog objects and saving them to the database. Displays a brief listing of all the exceptions currently in the database. Displays details about a specific exception.

In a full-fledged exception logging solution, there would be many more classes to help manage configuration and extensibility. This example, however, strives for simplicity so there are not many auxiliary classes or functionality. We ll begin by looking at the database structure required to store exception log information. After that, we ll move on to the exception logging actual classes, starting with the ExceptionLog class.

Logs the messages to a database. Logs the messages in an asynchronous manner using JMS technology. Sends the log messages to another machine by opening a socket connection. Sends the logging messages to recipients by e-mail.

Native cube (cube.c) is the last file in the lot (see Listing 5-15). This file is a carbon copy of Cube.java. It defines the vertices, colors, and indices of the cube, and draws it in the same way as its Java counterpart. Listing 5-15. Native Implementation of Cube.java #include #include #include #include <stdio.h> <unistd.h> <stdlib.h> <GLES/gl.h>

Before you can store information in a database, you need to build out an appropriate data structure to hold the data. In the example application for 2 (in the Source Code area of the Apress website), you ll find a SQL Server database named 02.mdf. This database contains a table named ExceptionLog, which stores all the exception information for the sample application. Table 2-3 provides a rundown of the fields in the table and their purposes. Table 2-3. ExceptionLog Table Fields

Unique identifier for the record. Links an inner exception to its parent exception and defines the hierarchy of exception in an exception chain. When nonzero, this field indicates that the record is an inner exception and references the ExceptionID of the parent. A value of zero for this field indicates that the record is a top-level exception that has no parent. Network name of the machine on which the exception occurred. User ID identifying the web-based user who experienced the exception. Identifies the type of browser used. Date and time when the exception occurred. Type name of the exception. Message of the exception. Application relative path of the page on which the error occurred (for example, ~/Default.aspx). Stack trace at the time the exception occurred. This contains information that helps identify what chain of methods were executing at the time of the exception. Listing of all the query string variable names and values. Listing of all the form variable names and values.