1. The Model is the Code
Using COSA Technology
by
Gordon Morrison
Copyright © 2012
All Rights Reserved
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2. It wasn’t the “go to”
• The ‘if’ has caused
more spaghetti code
than the ‘go to’ ever
could.
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3. Simple Calculator Example
• Subtract two negative
numbers resulting in a
negative result.
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4. A COSA Solution
• Rules
– Operand1
– Operate
– Operand2
– Result
– Done
– Error
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5. The Application
• Five Functions
– Add
– Subtract
– Multiply
– Divide
– Percent
• Clear
• Clear Entry
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6. On Subtract Event
• Handled as Negate
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7. Run Engine
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8. Engine On
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9. Check Event State
• Static State
– Compared to
• Dynamic State
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10. True Rule or Behavior
• Dynamically bind to
True Member
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11. Operand1 Rule
• Step
– Negate
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12. Rule’s True Behavior
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13. Single Point True Trace
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14. Trace what you want
• Complex or
• Simple
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15. Next Rule
• Base on True
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16. Engine Off
• Return to OS…
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17. Exit to OS
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18. Model
• Model = Code
• Code = Model
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19. Application
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20. Next On Click Event
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21. Back to Engine
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24. Same Rule Next Step
• Previous Step Allows
– True Any Number
– False One Period
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25. True Behavior
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26. Turn Engine Off
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27. Trace
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28. Next True Step
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29. Engine Off
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30. Return to OS
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31. Rule Operand1 Step Any Number
• Model = Code
• Code = Model
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51. Number
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53. Now Click Subtract
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54. Subtract
• On Click Event
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55. Not Any Number
• Next Step
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56. Not Any Number
• Next Step
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57. Not Clear Entry
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58. Not Clear Entry
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59. Not Clear
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60. Not Clear
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61. Rule Operate
• Not Step Addition
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62. Not Addition Step
• Rule Operate
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63. Rule Operate
• Step Subtract
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64. Rule Operate
• Step Subtraction
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65. Next Rule
• Operand 2
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66. First Step
• Return to OS
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67. Subtracting
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70. Rule Operand2
• Step Negate
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74. A Negative Number
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90. Then Click Equals
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91. On Click Equals
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92. Not Any Number Step
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93. Exit Rule Operand 2
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95. Not Clear Entry
• Etc.
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96. Result Rule
• Not Percent Step
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97. Result Rule
• Equals Step
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98. Result
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