com.h3c.util.dao

Class DataStoreManager

java.lang.Object

com.h3c.util.dao.DataStoreManager

All Implemented Interfaces:

DataStoreService

public class DataStoreManager
extends Object
implements DataStoreService

Basic implementation of the Data Store Service using JPA. A constructor is provided to seed the Entity Manager Factory for use by this class.

Constructor Summary

Constructors

Constructor and Description
DataStoreManager(javax.persistence.EntityManagerFactory emf, org.slf4j.Logger log) Construct the instance to use the provided entity manager factory

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	execute(ReadQuery<T> query) Executes a query operation on the persistence layer.
<T> T	execute(WriteQuery<T> update) Executes an update operation on the persistence layer.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DataStoreManager

public DataStoreManager(javax.persistence.EntityManagerFactory emf,
                org.slf4j.Logger log)

Construct the instance to use the provided entity manager factory

Parameters:

emf - the entity manager factory to be used.

log - the Logger implementation to use

Method Detail

execute

public <T> T execute(ReadQuery<T> query)
          throws Exception

Description copied from interface: DataStoreService

Executes a query operation on the persistence layer.

Specified by:

execute in interface DataStoreService

Type Parameters:

T - type of the query result.

Parameters:

query - the query to execute.

Returns:

the query result.

Throws:

Exception - if exception happen while executing the query.

execute

public <T> T execute(WriteQuery<T> update)
          throws Exception

Description copied from interface: DataStoreService

Executes an update operation on the persistence layer.

Specified by:

execute in interface DataStoreService

Type Parameters:

T - type of the update result.

Parameters:

update - the database update to execute.

Returns:

the update result.

Throws:

Exception - if exception happen while executing the update.