com.github.hdy.common.spring.SpringContextHolder Maven / Gradle / Ivy
package com.github.hdy.common.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;
/**
* Spring 工具类
* Springframework 上下文持有者
*
* @author 贺大爷
* @date 2019/2/1
*/
@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;
}
/**
* 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
*/
@SuppressWarnings("unchecked")
public static T getBean(String name) {
return (T) applicationContext.getBean(name);
}
/**
* 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
*/
public static T getBean(Class requiredType) {
return applicationContext.getBean(requiredType);
}
/**
* 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();
}
}