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SpringApplication解析

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成员解析

primarySources与sources

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public class SpringApplication {

    //...

	private Set<Class<?>> primarySources;

	private Set<String> sources = new LinkedHashSet<>();
	
	//...
	
	public void addPrimarySources(Collection<Class<?>> additionalPrimarySources) {
		this.primarySources.addAll(additionalPrimarySources);
	}
	
	public void setSources(Set<String> sources) {
		Assert.notNull(sources, "Sources must not be null");
		this.sources = new LinkedHashSet<>(sources);
	}
}

primarySources与sources最直观的区别就是一个是Class集合，一个是String集合，但是两个变量
都是用来构建ApplicationContext。另一个则是，primarySources可以追加，但是sources则会被
后一个sources覆盖。

ApplicationContextFactory - 初始化ApplicationContext

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   // SpringApplication.class
protected void load(ApplicationContext context, Object[] sources) {
	if (logger.isDebugEnabled()) {
		logger.debug("Loading source " + StringUtils.arrayToCommaDelimitedString(sources));
	}
	// BeanDefinitionLoader是用于load环境的帮助类
	BeanDefinitionLoader loader = createBeanDefinitionLoader(getBeanDefinitionRegistry(context), sources);
	if (this.beanNameGenerator != null) {
		loader.setBeanNameGenerator(this.beanNameGenerator);
	}
	if (this.resourceLoader != null) {
		loader.setResourceLoader(this.resourceLoader);
	}
	if (this.environment != null) {
		loader.setEnvironment(this.environment);
	}
	loader.load();
}

BeanDefinitionLoader -