package com.ihooyah.common.util.spring;

import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
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;

@Slf4j
@Service
@Lazy(false)
public class SpringContextHolder implements ApplicationContextAware, DisposableBean
{
    private static ApplicationContext applicationContext = null;

    /**
     * 取得存储在静态变量中的ApplicationContext.
     */
    public static ApplicationContext getApplicationContext()
    {
        return applicationContext;
    }

    /**
     * 实现ApplicationContextAware接口, 注入Context到静态变量中.
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
    {
        SpringContextHolder.applicationContext = applicationContext;
    }

    /**
     * 清除SpringContextHolder中的ApplicationContext为Null.
     */
    public static void clearHolder()
    {
        if (log.isDebugEnabled())
        {
            log.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
        }
        applicationContext = null;
    }

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

    /**
     * 实现DisposableBean接口, 在Context关闭时清理静态变量.
     */
    @Override
    @SneakyThrows
    public void destroy()
    {
        SpringContextHolder.clearHolder();
    }
}