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{
    "event": {
        "header": {
            "namespace": "Alexa.Discovery",
            "name": "Discover.Response",
            "messageId": "c2e421b5-a277-4f2f-a4e4-dfaa91eb5391",
            "payloadVersion": "3"
        },
        "payload": {
            "endpoints": [

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// hashmap的扩容方法
final Node<K,V>[] resize() {
        Node<K,V>[] oldTab = table;
        int oldCap = (oldTab == null) ? 0 : oldTab.length;
        int oldThr = threshold;
        int newCap, newThr = 0;
        if (oldCap > 0) {
            if (oldCap >= MAXIMUM_CAPACITY) {
                threshold = Integer.MAX_VALUE;
                return oldTab;

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<?xml version="1.0" encoding="UTF-8"?>

<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.learning.spring</groupId>
	<artifactId>hello-spring</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>hello-spring</name>
	<description>hello spring</description>

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public abstract class AbstractApplicationContext extends DefaultResourceLoader
		implements ConfigurableApplicationContext {	
	//每次refresh会destory Beanfactory中已经初始化的对象
	public void refresh() throws BeansException, IllegalStateException {
		synchronized (this.startupShutdownMonitor) {
			
			prepareRefresh();

			// ,刷新beanFactory(如果没有,就创建一个)从配置文件或配置类中读取beanName,beanDefinition等信息,并注册到beanFactory中
			ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();

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// Initializer结构中最顶层的抽象类，可以直接拓展它，使用了模板方法的设计模式，每个子类都专注一个功能
public abstract class AbstractAnnotationConfigDispatcherServletInitializer
		extends AbstractDispatcherServletInitializer {

	// 如果实现类没重写createRootApplicationContext()方法, 则在创建RootApplicationContext会被调用
	@Override
	@Nullable
	protected WebApplicationContext createRootApplicationContext() {
		//指定rootWebApplicationContext的configClasses类，可以有多个,也可以没有; 如果有,getRootConfigClasses()需要被重写
		Class<?>[] configClasses = getRootConfigClasses();