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When you log an exception, you have to account for the chance that the exception exists as an exception chain and has a series of inner exceptions As such, each exception needs to know its ParentID and ChainID so it knows which exception chain it belongs to and which exception in that chain is its parent The Log method accepts a single exception named ex as a parameter and is responsible for iterating through each exception in the chain and saving it with the appropriate exception information, ParentID, and ChainID At the beginning of the Log method, you can see the declarations for all the variables used throughout the code There are a few things you need to be aware of in the declarations First, the method sets ParentID to 0 because the first exception in the chain has no parent.

The properties discussed in the previous section are optional and can be configured with TTCCLayout to attach to a logging message. None of those are mandatory properties. For a given TTCCLayout configuration, you may decide to invalidate all those configurable parameters. Then there is not much point in using TTCCLayout. However, should you decide to invalidate those parameters, TTCCLayout will still give out the following information: Level: The level of the logging message Message: The logging message itself You will now see how to write a simple program to illustrate the formatting that the TTCCLayout object provides. For the sake of completeness, we will first configure the logger used in this example programmatically. Later we ll configure it through a configuration file.

Also notice that it assigns the ChainID a new Guid value using the GuidNewGuid() function This value links all the exceptions in the chain together and does not change from one exception to the next And, finally, the code creates a new database connection string defined in the ConnectionString property After defining variables, the code opens the database connection and jumps into a While loop that continues until the ex variable no longer points to an exception Inside the While loop, the Log method creates a new ExceptionLog object and then populates that object with exception and environmental data that can help track down the cause of the exception Table 2-3 contains a detailed listing of the properties and what they represent if you need to refresh your memory as to what a properties stores.

Done. Out file is libgltest_jni.so Check for missing symbols with this code: user@ubuntu:~/workspace/ch05.OpenGL/native$ make dyn agcc -c test.c -I/home/user/mydroid/frameworks/base/opengl/include ald -o gl-dyn test.o -lgltest_jni -L. arm-none-linux-gnueabi-ld: warning: library search path "/usr/lib/jvm/java-6sun/jre/lib/i386" is unsafe for cross-compilation arm-none-linux-gnueabi-ld: warning: cannot find entry symbol _start; defaulting to 000082e8 Done. Out file is gl-dyn

After the ExceptionLog properties have been set, the Log function saves the ExceptionLog object using the object s Save method and the open database connection If the save was successful, the method assigns the parentID variable the value just given to the saved ExceptionLog object This ensures that the next exception will have an appropriate ParentID It then sets ex to exInnerException, which causes the While loop to continue until all the inner exceptions have been saved After exiting the While loop, the method closes the database connection and all the exceptions in the exception chain are in the database..

Knowing what the user entered into a web form is invaluable knowledge when it comes to debugging an exception. Because most user input arrives at the server in the form of query string or form variables, you ll find it very helpful to save query string and form variable data in the exception log. The GetQueryString and GetFormData functions help format that information into a more human-readable format by outputting each name-value pair on its own line. Because a significant amount of string concatenation is going on, both functions also use the StringBuilder object to build the string as it s well suited for building strings quickly and efficiently.