前面一章分析了beanfactory的接口體系,如今看一個完整的beanfactory實現,它實現了咱們上一章說到的三個接口,提供了一個完整的IoC能力。code
看註釋排序
/** k-v,k序列化id,v是工廠實例 */ private static final Map<String, Reference<DefaultListableBeanFactory>> serializableFactories = new ConcurrentHashMap<>(8); /** 是否容許同一個beanName的bean定義重寫 */ private boolean allowBeanDefinitionOverriding = true; /** 是否容許指望類加載*/ private boolean allowEagerClassLoading = true; /** 一個依賴排序器 */ @Nullable private Comparator<Object> dependencyComparator; /** 自動裝配候選者解析器,判斷是否能夠用來裝配 */ private AutowireCandidateResolver autowireCandidateResolver = SimpleAutowireCandidateResolver.INSTANCE; /** 依賴的type與value的映射 */ private final Map<Class<?>, Object> resolvableDependencies = new ConcurrentHashMap<>(16); /** beanName和beanDefinition的映射 */ private final Map<String, BeanDefinition> beanDefinitionMap = new ConcurrentHashMap<>(256); /** beanName和beanDefinitionHolder的映射 */ private final Map<String, BeanDefinitionHolder> mergedBeanDefinitionHolders = new ConcurrentHashMap<>(256); /** beanType和beanName映射,包括單例和非單例*/ private final Map<Class<?>, String[]> allBeanNamesByType = new ConcurrentHashMap<>(64); /** beanType和beanName映射,只包括單例*/ private final Map<Class<?>, String[]> singletonBeanNamesByType = new ConcurrentHashMap<>(64); /** 以註冊時的順序列出bean定義的名字 */ private volatile List<String> beanDefinitionNames = new ArrayList<>(256); /** 以註冊時的順序列出手動註冊單例的bean定義的名字*/ private volatile Set<String> manualSingletonNames = new LinkedHashSet<>(16); /** 凍結一些bean定義的名字防止修改*/ @Nullable private volatile String[] frozenBeanDefinitionNames; /** 是否凍結bean定義 */ private volatile boolean configurationFrozen = false;