Spring-06-用BeanDefinition创建Bean

1 有依赖的时候

// 记录Bean创建过程中存在的依赖关系 要双向关系有记录 用来检索是不是存在循环依赖
/** Map between dependent bean names: bean name to Set of dependent bean names. */
// 依赖我的有谁
private final Map<String, Set<String>> dependentBeanMap = new ConcurrentHashMap<>(64);

/** Map between depending bean names: bean name to Set of bean names for the bean's dependencies. */
// 我依赖哪些人
private final Map<String, Set<String>> dependenciesForBeanMap = new ConcurrentHashMap<>(64);

/**
 * dependentBeanName依赖beanName
 * 第二个参数依赖第一个参数
 * 维护双向关系 后面用来检测是不是有循环依赖
 */
public void registerDependentBean(String beanName, String dependentBeanName) {
	String canonicalName = canonicalName(beanName);

	// 依赖我的有谁
	synchronized (this.dependentBeanMap) {
		Set<String> dependentBeans =
				this.dependentBeanMap.computeIfAbsent(canonicalName, key -> new LinkedHashSet<>(8));
		if (!dependentBeans.add(dependentBeanName)) {
			return;
		}
	}
	// 我依赖谁
	synchronized (this.dependenciesForBeanMap) {
		Set<String> dependenciesForBean =
				this.dependenciesForBeanMap.computeIfAbsent(dependentBeanName, key -> new LinkedHashSet<>(8));
		dependenciesForBean.add(canonicalName);
	}
}

2

AbstractBeanFactory 273行 doGetBean方法