PersistenceUnitManager (Spring Framework 4.3.30.RELEASE API)

所有已知实现类:
DefaultPersistenceUnitManager
```
public interface PersistenceUnitManager
```
Interface that defines an abstraction for finding and managing JPA PersistenceUnitInfos. Used by LocalContainerEntityManagerFactoryBean in order to obtain a PersistenceUnitInfo for building a concrete EntityManagerFactory.
Obtaining a PersistenceUnitInfo instance is an exclusive process. A PersistenceUnitInfo instance is not available for further calls anymore once it has been obtained.
从以下版本开始:
2.0
作者:
Juergen Hoeller
另请参阅:
DefaultPersistenceUnitManager, LocalContainerEntityManagerFactoryBean.setPersistenceUnitManager(org.springframework.orm.jpa.persistenceunit.PersistenceUnitManager)

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`PersistenceUnitInfo`	`obtainDefaultPersistenceUnitInfo()`	Obtain the default PersistenceUnitInfo from this manager.
`PersistenceUnitInfo`	`obtainPersistenceUnitInfo(String persistenceUnitName)`	Obtain the specified PersistenceUnitInfo from this manager.

- 方法详细资料
  - obtainDefaultPersistenceUnitInfo
```
PersistenceUnitInfo obtainDefaultPersistenceUnitInfo()
                                              throws IllegalStateException
```
    Obtain the default PersistenceUnitInfo from this manager.
    返回:
    the PersistenceUnitInfo (never null)
    抛出:
    IllegalStateException - if there is no default PersistenceUnitInfo defined or it has already been obtained
  - obtainPersistenceUnitInfo
```
PersistenceUnitInfo obtainPersistenceUnitInfo(String persistenceUnitName)
                                       throws IllegalArgumentException,
                                              IllegalStateException
```
    Obtain the specified PersistenceUnitInfo from this manager.
    参数:
    persistenceUnitName - the name of the desired persistence unit
    返回:
    the PersistenceUnitInfo (never null)
    抛出:
    IllegalArgumentException - if no PersistenceUnitInfo with the given name is defined
    IllegalStateException - if the PersistenceUnitInfo with the given name has already been obtained