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• Rules - statements in which the thread of execution is non-sequential based on events occurring or data changing

• Methods -statements that are tied to a particular class in which the thread of execution is sequential when the method is explicitly invoked

• Procedures - statements that are independent of any class in which the thread of execution is sequential when the procedure is explicitly invoked

• Rule-based processing, which includes two general techniques:
  • Event detection - where G2 detects an event, using a "whenever" rule, which causes one or more actions occur simultaneously

  • Data-driven processing and forward chaining - where G2 detects data changes, which causes forward chaining to "if" rules that test those data values and which causes one or more actions to occur simultaneously if the test is true

• Procedural processing, which includes both methods and procedures, and can result in either:
  • Single-threaded processing- where one or more actions occur sequentially within the same process, with no wait states

  • Multi-threaded processing - where an action either starts a completely new sequential process or starts a new subthread, with or without wait states

You use different types of processing, depending on the needs of your application. However, in general, most G2 applications perform the bulk of processing by using methods and procedures.

For information on naming and coding conventions for methods, procedures, and rules, see Chapter 7, Coding Conventions.

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