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https://github.com/tiennm99/java-design-patterns.git
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BAGHDAD MohamedandGitHub
5d6ff2f0c4
Add an educational rule-engine module demonstrating the Rule Engine pattern. Each business rule is an independent object exposing evaluate (decision) and execute (action); a RuleEngine evaluates a collection of rules against an immutable loan-application context in insertion order, runs the passing rules, and reports every passed and failed rule via an immutable RuleEngineResult. Includes three concrete rules, an App demo, unit tests, README, and class diagram.
62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
@startuml
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package com.iluwatar.ruleengine {
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interface Rule<T> {
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+ name() : String {abstract}
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+ evaluate(context : T) : boolean {abstract}
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+ execute(context : T) : void {abstract}
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}
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class RuleEngine<T> {
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- rules : List<Rule<T>>
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+ RuleEngine(rules : List<Rule<T>>)
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+ run(context : T) : RuleEngineResult
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+ rules() : List<Rule<T>>
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}
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class RuleEngineResult {
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+ RuleEngineResult(approved : boolean, passedRules : List<String>, failedRules : List<String>)
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+ approved() : boolean
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+ passedRules() : List<String>
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+ failedRules() : List<String>
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}
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class LoanApplication {
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+ LoanApplication(age : int, monthlyIncome : double, loanAmount : double, creditScore : int)
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+ age() : int
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+ monthlyIncome() : double
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+ loanAmount() : double
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+ creditScore() : int
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}
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class MinimumAgeRule {
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- minimumAge : int
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+ MinimumAgeRule(minimumAge : int)
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+ name() : String
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+ evaluate(context : LoanApplication) : boolean
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+ execute(context : LoanApplication) : void
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}
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class MinimumIncomeRule {
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- minimumIncome : double
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+ MinimumIncomeRule(minimumIncome : double)
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+ name() : String
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+ evaluate(context : LoanApplication) : boolean
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+ execute(context : LoanApplication) : void
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}
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class CreditScoreRule {
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- minimumScore : int
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+ CreditScoreRule(minimumScore : int)
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+ name() : String
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+ evaluate(context : LoanApplication) : boolean
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+ execute(context : LoanApplication) : void
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}
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class App {
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+ App()
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+ main(args : String[]) : void
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}
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}
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RuleEngine --> "*" Rule
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RuleEngine ..> RuleEngineResult
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MinimumAgeRule ..|> Rule
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MinimumIncomeRule ..|> Rule
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CreditScoreRule ..|> Rule
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MinimumAgeRule ..> LoanApplication
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MinimumIncomeRule ..> LoanApplication
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CreditScoreRule ..> LoanApplication
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@enduml
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