package cc.mrbird.febs.common.utils;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.BeansException;
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import org.springframework.beans.factory.DisposableBean;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.ApplicationContextAware;
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import org.springframework.stereotype.Component;
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/**
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* @Author wzy
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* @Date 2020/5/11
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* @email wangdoubleone@gmail.com
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* @Version V1.0
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**/
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@Slf4j
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@Component
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public class SpringContextHolder implements ApplicationContextAware, DisposableBean {
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private static ApplicationContext applicationContext = null;
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/**
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* 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
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*/
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@SuppressWarnings("unchecked")
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public static <T> T getBean(String name) {
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assertContextInjected();
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return (T) applicationContext.getBean(name);
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}
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/**
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* 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型.
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*/
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public static <T> T getBean(Class<T> requiredType) {
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assertContextInjected();
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return applicationContext.getBean(requiredType);
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}
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private static void assertContextInjected() {
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if (applicationContext == null) {
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throw new IllegalStateException("applicaitonContext属性未注入, 请在applicationContext" +
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".xml中定义SpringContextHolder或在SpringBoot启动类中注册SpringContextHolder.");
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}
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}
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/**
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* 检查ApplicationContext不为空.
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*/
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private static void clearHolder() {
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log.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
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applicationContext = null;
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}
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@Override
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public void destroy() throws Exception {
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SpringContextHolder.clearHolder();
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}
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@Override
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public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
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if (SpringContextHolder.applicationContext != null) {
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log.warn("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:" + SpringContextHolder.applicationContext);
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}
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SpringContextHolder.applicationContext = applicationContext;
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}
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}
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