package com.yami.trading.common.util;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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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.beans.factory.ListableBeanFactory;
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import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
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import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
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import org.springframework.beans.factory.support.BeanDefinitionBuilder;
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import org.springframework.beans.factory.support.DefaultListableBeanFactory;
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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.context.ApplicationEvent;
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import org.springframework.context.ConfigurableApplicationContext;
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import org.springframework.context.annotation.Lazy;
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import org.springframework.core.env.Environment;
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import org.springframework.stereotype.Component;
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import java.util.Map;
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/**
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* 手动获取bean的工具类
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*/
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@Component
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// 关闭延迟加载
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@Lazy(value = false)
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public class SpringBeanUtil implements BeanFactoryPostProcessor, ApplicationContextAware, DisposableBean {
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private final static Logger logger = LoggerFactory.getLogger(SpringBeanUtil.class);
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private static ConfigurableListableBeanFactory beanFactory;
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private static ApplicationContext applicationContext = null;
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private static Environment environment;
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/**
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* 取得存储在静态变量中的ApplicationContext.
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*/
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public static ApplicationContext getApplicationContext() {
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return applicationContext;
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}
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/**
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* BeanFactoryPostProcessor, 注入Context到静态变量中.
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*/
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@Override
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public void postProcessBeanFactory(ConfigurableListableBeanFactory factory) throws BeansException {
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SpringBeanUtil.beanFactory = factory;
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}
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/**
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* 实现ApplicationContextAware接口, 注入Context到静态变量中.
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*/
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@Override
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public void setApplicationContext(ApplicationContext applicationContext) {
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SpringBeanUtil.applicationContext = applicationContext;
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environment = applicationContext.getEnvironment();
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}
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public static ListableBeanFactory getBeanFactory() {
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return null == beanFactory ? applicationContext : beanFactory;
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}
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/**
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* 从静态变量applicationContext中取得Bean, Map<Bean名称，实现类></>
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*/
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public static <T> Map<String, T> getBeansOfType(Class<T> type) {
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return getBeanFactory().getBeansOfType(type);
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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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@SuppressWarnings("unchecked")
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public static <T> T getBean(String name) {
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return (T) getBeanFactory().getBean(name);
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}
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public static <T> T getBean(String name, Class<T> clazz) {
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return applicationContext.getBean(name, clazz);
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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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* 如果对应的 bean 不存在，此处会抛出异常
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*/
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public static <T> T getBean(Class<T> requiredType) {
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if (applicationContext == null) {
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logger.error("applicationContext is null");
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throw new RuntimeException("SpringContextHolder，你可以在引用Bean内Autowire该Bean");
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}
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return (T) (getBeanFactory().getBean(requiredType));
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}
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public static void setEnv(Environment env) {
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if (env != null) {
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environment = env;
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}
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}
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public static Environment getEnv() {
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return environment;
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}
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/**
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* 清除SpringContextHolder中的ApplicationContext为Null.
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*/
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public static void clearHolder() {
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if (logger.isDebugEnabled()) {
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logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
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}
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applicationContext = null;
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}
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/**
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* 发布事件
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* @param event
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*/
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public static void publishEvent(ApplicationEvent event) {
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if (applicationContext == null) {
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return;
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}
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applicationContext.publishEvent(event);
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}
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/**
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* 动态注入bean
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* AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.rootBeanDefinition(User.class).getBeanDefinition();
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* registry.registerBeanDefinition("user", beanDefinition);
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* @param requiredType 注入类
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* @param beanName bean名称
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*/
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public static Object registerBean(Class<?> requiredType, String beanName) {
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//将applicationContext转换为ConfigurableApplicationContext
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ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;
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//获取BeanFactory
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DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getAutowireCapableBeanFactory();
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//创建bean信息.
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BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(requiredType);
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//动态注册bean.
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defaultListableBeanFactory.registerBeanDefinition(beanName, beanDefinitionBuilder.getBeanDefinition());
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//获取动态注册的bean.
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return configurableApplicationContext.getBean(requiredType);
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}
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/**
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* 实现DisposableBean接口, 在Context关闭时清理静态变量.
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*/
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@Override
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public void destroy() {
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SpringBeanUtil.clearHolder();
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}
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}
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