drools example

scaffold of building DDD (Domain Driven Design) projects based on spring boot.

Prepare

MySQL 8.0.27+ JDK 16+

Get Start

execute sql domain/src/test/resources/init.sql

./mvnw clean install
./mvnw spring-boot:run -pl application

http://localhost:8080/api-doc/swagger-ui/

Project Structure

modules

application
domain
generator
service

with generator module helping, you can focus on business logic implementation in service module. all you need to do is create domain model table in mysql/oracle etc. then using generator for create all basic domain model classes and its CRUD APIs.

this project example using drools to check one entity whether satisfy defined rules. there two simple rules:

rule "user age < 11"
when
  $ctx : QualityCheckContext(checkFlags contains "age")
  $u : User(age < 11) from $ctx.data
then
  logger.info("user age < 11! user : {}", $u);
  $ctx.msg.add("user age < 11");
end

rule "user gender is unknown"
when
  $ctx : QualityCheckContext(checkFlags contains "gender")
  $u : User(gender == null || gender != "M" && gender != "F") from $ctx.data
then
  logger.info("user gender is unknown! user : {}", $u);
  $ctx.msg.add("user gender is unknown");
end

calling /api/qualityCheck in rule-controller to see what happens.

Code Snippet

batch command

KieContainerSessionsPool pool = kc.newKieSessionsPool(10);
StatelessKieSession ss = pool.newStatelessKieSession("kieSession");
List<Command> commands = new ArrayList<>();
commands.add(CommandFactory.newSetGlobal("logger", logger, false));
QualityCheckContext<User> ctx = QualityCheckContext.<User>builder()
        .type("user")
        .data(User.builder().age(17).gender("A").build())
        .checkFlags(new HashSet<>(Arrays.asList("age", "gender")))
        .msg(new ArrayList<>())
        .build();
commands.add(CommandFactory.newInsert(ctx, "0"));

ss.execute(CommandFactory.newBatchExecution(commands));

new founds

bugs: 雪花算法id长度超出js承受范围，后两位被强制置零。解决：long -> string

features: recompile java class : shift + command + F9

Reference

https://www.baeldung.com/swagger-2-documentation-for-spring-rest-api

carl-zk / drools-demo