io.naraplatform.daysman.daysboy.event.EventSubscriber Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of daysman-daysboy Show documentation

A application used as an example on how to set up pushing its components to the Central Repository.

The newest version!

package io.naraplatform.daysman.daysboy.event;

import io.naradrama.prologue.domain.cqrs.broker.StreamEventMessage;
import io.naraplatform.daysman.mediator.spec.EventHandler;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;
import org.springframework.util.ClassUtils;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

@Component
@Slf4j
public class EventSubscriber {
    //
    private List handlers = new ArrayList<>();
    private boolean scanned;

    private synchronized void register(ApplicationContext context) {
        //
        if (scanned) {
            return;
        }
        for (String name : context.getBeanDefinitionNames()) {
            Object bean = context.getBean(name);
            register(bean);
        }
        scanned = true;
    }

    private void register(Object bean) {
        //
        Class clazz = ClassUtils.getUserClass(bean.getClass());
        if (!clazz.getName().endsWith("Handler") && !clazz.getName().endsWith("Handlers")) {
            return;
        }

        for (Method method : clazz.getDeclaredMethods()) {
            if (isDaysmanEventHandler(method)) {
                log.info("add Method --> class:{} methods:{}", clazz.getName(), method.getName());
                handlers.add(new MethodInvokeEventHandler(bean, method));
            }
        }
    }

    private boolean isDaysmanEventHandler(Method method) {
        //
        for (Annotation annotation : method.getDeclaredAnnotations()) {
            if (annotation.annotationType() == DaysmanEventHandler.class) {
                return true;
            }
        }
        return false;
    }

    public void convey(StreamEventMessage streamEvent) {
        //
        if (!scanned) {
            register(ApplicationContextUtils.getApplicationContext());
        }
        handlers.forEach(handler -> handler.handle(streamEvent));
    }



}