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This chapter discussed the basic concepts and requirements for all business classes based on CSLA .NET. I discussed the life cycle of business objects and walked through the creation, retrieval, update, and delete processes. The basic structure of each type of business class was covered at a high level. There are common requirements, including making all the classes Serializable, implementing a common set of code regions for clarity of code, and including a non-Public constructor. I continue that discussion in 5 by walking through the kind of code that goes into each code region for the different object stereotypes. Then s 6 through 16 cover the implementation of the CSLA .NET framework that supports these stereotypes. Finally, s 17 through 21 show how to use these stereotypes and the framework to construct the Project Tracker application described in 3.
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The term data constants might be a little misleading. Located in a read/write section, data constants can certainly be overwritten, so technically they can hardly be called constants. The term, however, refers to the usage of the data rather than to the nature of the data. Data constants represent the mappings of the static fields and usually contain data initializing the mapped fields. ( 1 described the peculiarities of this field mapping.) Field mapping is a convenient way to initialize any static field with ANSI strings, blobs, or structures. An alternative way to initialize static fields and a more orthodox way in terms of the common language runtime is to do it explicitly by executing code in class constructors, as discussed in 9. But this alternative is much more tedious, so no one can really blame the managed compilers for resorting to field mapping for initialization. The VC++ compiler maps all the global fields, whether they will be initialized or not. Mapping static fields to data has its caveats. Fields mapped to the data section are, on the one hand, out of reach of runtime controlling mechanisms such as type control and garbage collection and, on the other hand, wide open to unrestricted access and modification. This causes the loader to prevent certain field types from being mapped; types of mapped fields might contain no references to objects, vectors, arrays, or any nonpublic substructures. No such problems arise if a class constructor is used for static field initialization. Philosophically speaking, this is only natural: throughout the history of humanity, deviations from orthodoxy, however tempting, have always brought some unpleasant complications.
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The following are some important general facts about C# arrays: Once an array is created, its size is fixed. C# does not support dynamic arrays. Array indexes are 0-based. That is, if the length of a dimension is n, the index values range from 0 to n 1. For example, Figure 14-1 shows the dimensions and lengths of two example arrays. Notice that for each dimension, the indexes range from 0 to length 1.
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Throws away existing elements and creates new ones based on parameters supplied Accesses an element at a specified position Gets the last element Gets an iterator pointing to the first element Gets the total amount of allocated space in the vector Removes all elements Determines whether or not the vector has any elements Gets an iterator pointing just past the end of the vector Removes an element Gets the first element Adds an element to any position Removes the last element Appends an element to the end Gets a reverse iterator that points to the last element Gets a reverse iterator that points just before the first element Sets aside additional capacity for more elements Increases the number of elements, creating new ones using the default constructor Gets the current number of elements that are being used Exchanges two elements Converts to a regular array
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Occurs at the beginning of a navigation to a content fragment (a well-formed content) request. Occurs after a navigation completes. Occurs at the beginning of a navigation request. Occurs after an error during a navigation attempt. Occurs after StopLoading is invoked or the current navigation is aborted via a new navigation request.
As a demonstration of brute-force mode, I have removed all of the entries from the input file cracker.lis except the entry for the database user D. In my case, this is simply to demonstrate the cracker without it running forever. The cracker is then run in brute-force mode by setting the m parameter for maximum password length of six characters, and the c parameter to set the character set to alpha + numeric that is, abcdefghijklmnopqrstuvwxyz0123456789 a character set of 36 characters. The dictionary file is now not necessary, of course. Listing 14-17 demonstrates brute-force cracking with woraauthbf. Listing 14-17. Running woraauthbf in Brute Force Mode C:\woraauthbf_0.22R3>woraauthbf -p cracker.lis -t hash -m 6 -c alpha um Usernames will be permuted! The number of processors: 2 Number of pwds to check: 2238976116 Number of pwds to check by thread: 1119488058 Password file: cracker.lis, charset: alphanum, maximum length: 6, type: hash Start: 0 End: 1119488058 Start: 1119488058 End: 2238976116 Start array thread with 489 number of passwords! Writing session files... Writing session files... Writing session files... Writing session files... Writing session files... Writing session files... Writing session files... Writing session files... Password found: D:XXXXXX:A:A Elpased time: 544s Checked passwords: 749562520 Password / Second: 1377872 C:\woraauthbf_0.22R3> Brute-forcing passwords is time-consuming, and extended cracking should be avoided. The example in Listing 14-17 ran for 9.06 minutes for just one user password. A simple calculation can be done to show how long any cracker attempt would take. For the example in Listing 14-17, the cracker was limited to a maximum password length of six. The total possible number of passwords is as follows:
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