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package com.ideaaedi.commonspring.injector;

import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.SmartInitializingSingleton;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.lang.NonNull;

import java.util.Objects;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * 对普通bean(即:非spring-bean)的autowired注入支持
 * 
 *     使用方式一:
 *         User user = new User();
 *         // 直接使用ExtAutowiredInjector.inject注入
 *         ExtAutowiredInjector.inject(user);
 *         user.sayHello();
 *     使用方式二:
 *        // 直接继承ExtAutowiredInjector
 *        public class User extends ExtAutowiredInjector {
 *        User user = new User();
 *        user.sayHello();
 * 
* * @author JustryDeng * @since 1.0.0 */ @Slf4j public abstract class ExtAutowiredInjector { public ExtAutowiredInjector() { Object obj = applyAutowired(); ExtAutowiredInjector.inject(obj); } /** * 对返回的object进行autowired注入处理 * * @return 要进行注入处理的Object */ protected Object applyAutowired() { return this; } /** * 对目标对象中的被@Auwired标注了的字段进行注入 * * @param obj * 目标obj */ public static void inject(Object obj) { if (obj == null) { log.warn("obj is null, skip inject."); return; } if (ExtAutowiredInjectorProcessor.applicationContext != null) { ExtAutowiredInjectorProcessor.applicationContext.publishEvent(new AutowiredInjectEvent(obj)); } else { ExtAutowiredInjectorProcessor.queue.add(obj); } } /** * Autowired注入支持事件 * * @author JustryDeng * @since 1.0.0 */ public static class AutowiredInjectEvent extends ApplicationEvent { @Getter private final Object bean; /** * Create a new ApplicationEvent. * * @param source * the object on which the event initially occurred (never {@code null}) */ public AutowiredInjectEvent(Object source) { super(source); Objects.requireNonNull(source, "source cannot be null."); this.bean = source; } } /** * {@link ExtAutowiredInjector}处理器 * * @author JustryDeng * @since 1.0.0 */ @Slf4j public static class ExtAutowiredInjectorProcessor implements SmartInitializingSingleton, ApplicationListener { static ApplicationContext applicationContext; static Queue queue = new ConcurrentLinkedQueue<>(); private final AutowireCapableBeanFactory autowireCapableBeanFactory; public ExtAutowiredInjectorProcessor(AutowireCapableBeanFactory autowireCapableBeanFactory, ApplicationContext applicationContext) { this.autowireCapableBeanFactory = autowireCapableBeanFactory; ExtAutowiredInjectorProcessor.applicationContext = applicationContext; } @Override public void onApplicationEvent(@NonNull AutowiredInjectEvent event) { Object bean = event.getBean(); autowireCapableBeanFactory.autowireBean(bean); afterSingletonsInstantiated(); } @Override public void afterSingletonsInstantiated() { Object obj = queue.poll(); while (obj != null) { autowireCapableBeanFactory.autowireBean(obj); obj = queue.poll(); } } } }