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Remember that each rule method accepts a target parameter, which is the object containing the data to be validated. This target is always the business object, so ValidationRules keeps a reference to the business object. This reference is provided via the constructor and can be reset through the SetTarget() method both of which you ve seen in the implementation of Csla.Core.BusinessBase: [NonSerialized()] private object _target; internal ValidationRules(object businessObject) { SetTarget(businessObject); } internal void SetTarget(object businessObject) { _target = businessObject; } Notice that the _target field is marked as [NonSerialized()]. This is important because otherwise the BinaryFormatter would trace the circular reference between the business object and the ValidationRules object, causing a bloated serialization byte stream. No failure would result, but the size of the byte stream would be larger than needed, which might cause a performance issue in some cases.

*/ #pragma once #pragma unmanaged #include "my_global.h" #include "my_sys.h"

To provide good performance in managing the list of rules for each property, ValidationRules uses an optimal data structure. Specifically, it has a dictionary with an entry for each property. Each entry in the dictionary contains a list of the rules for that property. This provides for very fast lookup to get the list of rules for a specific property, since the dictionary can jump right to the property s entry. The dictionary is strongly typed, keyed by the property name, and used for storing strongly typed lists of RuleMethod objects: [NonSerialized()] private Dictionary<string, List<RuleMethod>> _rulesList; The business developer calls an AddRule() method to associate a rule method with a property on the business object. There are two versions of this method, the simplest accepting just a rule method delegate and the name of the property: public void AddRule(RuleHandler handler, string propertyName) { // get the list of rules for the property List<RuleMethod> list = GetRulesForProperty(propertyName); // we have the list, add our new rule list.Add(new RuleMethod(_target, handler, propertyName)); }

class Spartan_data { public: Spartan_data(void); ~Spartan_data(void); int create_table(char *path); int open_table(char *path); long long write_row(byte *buf, int length); long long update_row(byte *old_rec, byte *new_rec, int length, long long position); int read_row(byte *buf, int length, long long position); int delete_row(byte *old_rec, int length, long long position); int close_table(); long long cur_position(); int records(); int del_records(); int trunc_table(); int row_size(int length); private: File data_file; int header_size; int record_header_size; bool crashed; int number_records; int number_del_records; int read_header(); int write_header(); }; Listing 7-4 includes the complete source code for the Spartan storage engine data class. Notice in the code I have included the appropriate DBUG calls to ensure my source code can write to the trace file should I wish to debug the system using the --with-debug switch. Notice also that the read and write methods used are the my_xxx platform-safe utility methods provided by MySQL AB. Listing 7-4. Spartan_data Class Source Code /* Spartan_data.cpp This class implements a simple data file reader/writer. It is designed to allow the caller to specify the size of the data to read or write. This allows for variable length records and the inclusion of extra fields (like BLOBs). The data is stored in an uncompressed, unoptimized fashion. */

The GetRulesForProperty() method returns the list of RuleMethod objects associated with the property. If such a list doesn t already exist, it creates an empty list and adds it to the dictionary. This is another example of lazy object creation. If there are no rules for a property, no list object is ever added to the dictionary, thus reducing the overhead of the whole process. In fact, the dictionary object itself is created on demand as well, so if no business rules are ever associated with properties for an object, even that little bit of overhead is avoided. The other AddRule() implementation provides an increased level of control. Its method signature is as follows: public void AddRule(RuleHandler handler, RuleArgs args) This overload allows the business developer to provide a specific RuleArgs object that will be passed to the rule method when it is invoked. This is required for any rule methods that require custom RuleArgs subclasses, so it will be used any time extra information needs to be passed to the rule method. The combination of the RuleMethod class, the dictionary and list object combination, and the AddRule() methods covers the management of the rules associated with each property.