Seervice服务：

A services provides a certain types of functionality, in a pluggable manner.

按照可插拔的方式提供摸个特定类型的功能；

/*** Marker interface for services.* 

* NOTE : All services must be {@link Serializable}! * * @author Steve Ebersole */ public interface Service extends Serializable { }

ServiceRegistry服务注册表：

A ServiceRegistry, at its most basic, hosts and manages Services.

服务注册表是用于创建 组织 存储 管理服务（IOC）；

注：Services have a lifecycle. They have a scope. Services might depend on other services. And they need to be produced (choose using one implementation over another). The ServiceRegistry fulfills all these needs.

服务注册表主要是为了方便控制Service生命周期而存在；

public interface ServiceRegistry {/*** Retrieve this registry's parent registry.* * @return The parent registry.  May be null.*/public ServiceRegistry getParentServiceRegistry();/*** Retrieve a service by role.  If service is not found, but a {@link org.hibernate.service.spi.ServiceInitiator} is* registered for this service role, the service will be initialized and returned.* 

* NOTE: We cannot return {@code >} here because the service might come from the parent... * 获得当服务 * @param serviceRole The service role * @param The service role type * * @return The requested service. * * @throws UnknownServiceException Indicates the service was not known. */ public R getService(Class serviceRole); }

ServiceBinding服务关联：

服务如何和服务注册表关联通常是通过ServiceRegistry来初始化服务来进行关联；

ServiceRegistry的分类：

在hibernate中有三种注册表  BootstrapServiceRegistry（引导服务注册表），StandardServiceRegistry（标准服务注册表），SessionFactoryServiceRegistry（会话工厂注册表）；

BootstrapServiceRegistry:

此注册表主要管理ClassLoaderService，IntegratorService，StrategySelector服务；

ClassLoaderService主要是用来和加载类资源 文件资源以及和java.util.ServiceLoader相互作用；（注：ServiceLoader是Java中提出的动态加载资源的方法I）；

IntegratorService主要用于应用 第三方平台和Hibernate的集成；

StrategySelector

StandardServiceRegistry：

SessionFactoryServiceRegistry：