SaitoWu / rules-engine

rules engine

Rules Engine

an useless library for refactor ur messy if/else business logic.

Requirements

• Java 5+
• MVEL2
• JUnit 3.8

Mini DSL

Rulebook rulebook = new Rulebook("book");
Map<String, Object> facts = new HashMap<String, Object>();

Rule rule1 = new Rule("rule1")
				.condition("color.equals(\"red\")")
				.action("System.out.println(\"color is \" + color); color = \"blue\"; System.out.println(\"change color to \" + color)")
				.priority(2);
		
Rule rule2 = new Rule("rule2")
				.condition("color.equals(\"blue\")")
				.action("System.out.println(\"color is \" + color); color = \"red\"; System.out.println(\"change color to \" + color)");
		
Rule rule3 = new Rule("rule3")
				.condition("color.equals(\"red\")")
				.action("System.out.println(\"color is \" + color); color = \"yellow\"; System.out.println(\"change color to \" + color)")
				.priority(1);
		
rulebook.addRules(rule1, rule2, rule3);

// normal mode
facts.put("color", "red");
Engine engine = new Engine(rulebook);
engine.run(facts);

// recursive mode
facts.put("color", "blue");
Engine engine = new Engine(rulebook);
engine.recursive = true;
engine.run(facts);

Tips

• rulesengine is not a "java like" java library. if u dont like this style. u can chage it by urself.

Author

• Saito Wu [e-mail]

License

• rulesengine is licensed under the MIT License.(See License)