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Code Generation For Business Rules
After you have modeled rules for all Rule Task elements in the Rule Flow diagram, the Business Domain model is ready for code transformation. The internal code templates provided for generating technology-specific rule code work hand-in-hand with the EASL code templates to generate the code from the rules-processing Class and its Rule Flow structure.
Return a value from the Rule Flow behavior
Step |
Action |
See also |
|---|---|---|
|
1 |
Double-click on the last Rule Task element before the end node of the Rule Flow diagram. The element's 'Properties' dialog displays. |
Create a Business Domain Model |
|
2 |
Click on the 'Effect' tab. |
|
|
3 |
In the 'Effect' field, type the return statement; for example, return True. |
|
|
4 |
Click on the , and on the to close the dialog. Generate code for the Class containing the rule flow behavior (in our initial example, Rental System); the code for business rules logic is generated, with the rule statements expressed in natural language as comments. |
Generate code for a single class |
Example
This code snippet was generated from the Rental System Class element in the EAExample model:
///////////////////////////////////////////////////////////
// RentalSystem.cs
// Implementation of the Class RentalSystem
// Generated by Enterprise Architect
// Created on: 26-July-2016 2:39:23 PM
///////////////////////////////////////////////////////////
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
public class RentalSystem
{
public Customer m_Customer;
public Car m_Car;
public Rent m_Rent;
public RentalSystem()
{
}
~RentalSystem()
{
}
public virtual void Dispose()
{
}
/* Begin - EA generated code for Activities and Interactions */
public bool ProcessApplication(Rent m_rent,Application m_application)
{
// behavior is an Activity
/*CAR MUST NOT BE RENTED TO CUSTOMERS WITHOUT A VALID LICENCE NUMBER*/
if(m_Customer.ValidLicenceNumber == "FALSE")
{
m_application.Status = "Reject";
m_Customer.Eligible = false;
}
/*CAR MUST NOT BE RENTED TO CUSTOMERS OF AGE LESS THAN 18*/
if(m_Customer.age < 18)
{
m_application.Status = "Reject";
m_Customer.Eligible = false;
}
/*CAR MUST NOT BE RENTED TO CUSTOMERS WITH BAD HISTORY LEVEL 3*/
if(m_Customer.BadHistoryLevel == 3)
{
m_application.Status = "Reject";
m_Customer.Eligible = false;
}
if (Customer.Eligible == true)
{
/*RENT FOR SMALL CARS IS 80 AUD PER DAY*/
if(m_Car.type == Small)
{
m_rent.RentPerDay = 80;
}
/*RENT FOR AWD CARS IS 100 AUD PER DAY*/
if(m_Car.type == AWD)
{
m_rent.RentPerDay = 100;
}
/*RENT FOR LUXURY CARS IS 150 AUD PER DAY*/
if(m_Car.type == Luxury)
{
m_rent.RentPerDay = 150;
}
/*RENT PAYABLE IS CALCULATED AS THE PRODUCT OF RENTPERDAY AND RENTALPERIOD IN DAYS*/
m_rent.RentPayable = m_rent.RentPerDay * m_rent.No_of_rent_days;
if (CustomerBadHistoryLevel > 0)
{
/*PENALTY OF 20 % OF RENT MUST BE APPLIED FOR CUSTOMERS WITH BAD HISTORY LEVEL 2*/
if(m_Customer.BadHistoryLevel == 2)
{
m_rent.PenaltyFee = m_rent.RentPayable * 0.2;
}
/*PENALTY OF 10 % OF RENT MUST BE APPLIED FOR CUSTOMERS WITH BAD HISTORY LEVEL 1*/
if(m_Customer.BadHistoryLevel == 1)
{
m_rent.PenaltyFee = m_rent.RentPayable * 0.1;
}
}
else
{
}
/*TOTAL AMOUNT PAYABLE IS CALCULATED AS THE SUM OF RENT PAYABLE AND PENALTY IF ANY.*/
m_rent.TotalAmountPayable = m_rent.RentPerDay + m_rent.PenaltyFee;
}
else
{
}
return m_application.Status;
}
/* End - EA generated code for Activities and Interactions */
}
//end RentalSystem
Notes
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