JarCastingGetting Started
To start playing with rules just add the dependency to your project: au.com.agilepractices.rules.engine:rule-engine-core:
Maven
<dependency>
<groupId>au.com.agilepractices.rules.engine</groupId>
<artifactId>rules-engine-core</artifactId>
<version>${rules.version}</version>
</dependency>
Gradle
dependencies {
compile "au.com.agilepractices.rules.engine:rules-engine-core:$rulesVersion"
}
A rule consists of:
- A Condition - which must evaluate to
trueorfalse - An Action - which is executed if the Condition evaluates to
true - An optional alternative Action - which is executed if the Condition evaluates to
false
Example
First step towards evaluation using the rule engine is to define a rule.
We can do it using:
- Java DSL
final Rule<String, String> rule = RuleBuilder.newRule()
.when((input, ruleAuditor) -> true)
.then(context -> context.setResult("Hello " + context.getData()))
.build();
Then add the Rule to a RuleBook
RuleBook<String, String> ruleBook = RuleBook.newInstance(String.class, String.class)
.add(rule);
To execute the RuleBook:
String result = new SimpleRuleExecutor<>(ruleBook)
.execute("World");
assertThat(result).isEqualTo("Hello World");