package com.github.tangyi.common.core.utils;

import com.github.tangyi.common.core.exceptions.CommonException;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;

/**
 * 以静态变量保存Spring ApplicationContext
 *
 * @author tangyi
 * @date 2018-08-24 19:04
 */
@Service
@Lazy(false)
public class SpringContextHolder implements ApplicationContextAware, DisposableBean {

    private static ApplicationContext applicationContext = null;

    /**
     * 获取applicationContext
     *
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        if (applicationContext == null)
            throw new CommonException("applicationContext为空！");
        return applicationContext;
    }

    @Override
    public void destroy() throws Exception {
        applicationContext = null;
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextHolder.applicationContext = applicationContext;
    }

    /**
     * 发布事件
     *
     * @param event
     */
    public static void publishEvent(ApplicationEvent event) {
        if (applicationContext == null) {
            return;
        }
        applicationContext.publishEvent(event);
    }
}
