EMF (SmartClient Enterprise Server API 15.0d (2025-09-09))

java.lang.Object
- com.isomorphic.jpa.EMF

```
public class EMF
extends java.lang.Object
```
Singleton factory for EntityManager and transaction with helper methods.
Configuration is read from server.properties file. Value of property jpa.emfProvider specifies actual implementation. Methods hiding EntityManager and transaction object initialization are used by JPADataSource:
- getEntityManager
- returnEntityManager
- getTransaction
- commitTransaction
- rollbackTransaction

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`EMF_PROVIDER` Name of sub property for JPA EMF provider implementation.
`static java.lang.String`	`JPA_EMF_PROVIDER` Name of property for JPA EMF provider implementation.
`static java.lang.String`	`JPA_PREFIX` Name of prefix for JPA EMF provider block.
`static java.lang.String`	`TRANSACTION_ATTR` Attribute name for RPCManager.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`commitTransaction(java.lang.Object tx)` Commits specified transaction.
`static void`	`commitTransaction(java.lang.String configName, java.lang.Object tx)` Commits specified transaction.
`static EntityManagerFactory`	`get()` Returns `EntityManagerFactory`.
`static EntityManagerFactory`	`get(java.lang.String configName)` Returns `EntityManagerFactory`.
`static EntityManager`	`getEntityManager()` Returns `EntityManager` for persistence operations.
`static EntityManager`	`getEntityManager(java.lang.String configName)` Returns `EntityManager` for persistence operations.
`static java.lang.Object`	`getTransaction(EntityManager em)` Returns started transaction.
`static java.lang.Object`	`getTransaction(java.lang.String configName, EntityManager em)` Returns started transaction.
`static void`	`returnEntityManager(EntityManager em)` Closes `EntityManager`.
`static void`	`returnEntityManager(java.lang.String configName, EntityManager em)` Closes `EntityManager`.
`static void`	`rollbackTransaction(java.lang.Object tx)` Rolls back specified transaction.
`static void`	`rollbackTransaction(java.lang.String configName, java.lang.Object tx)` Rolls back specified transaction.

- Field Detail
  - JPA_PREFIX
```
public static final java.lang.String JPA_PREFIX
```
    Name of prefix for JPA EMF provider block.
    
    See Also:
    
    Constant Field Values
  - EMF_PROVIDER
```
public static final java.lang.String EMF_PROVIDER
```
    Name of sub property for JPA EMF provider implementation.
    
    See Also:
    
    Constant Field Values
  - JPA_EMF_PROVIDER
```
public static final java.lang.String JPA_EMF_PROVIDER
```
    Name of property for JPA EMF provider implementation.
    
    See Also:
    
    Constant Field Values
  - TRANSACTION_ATTR
```
public static final java.lang.String TRANSACTION_ATTR
```
    Attribute name for RPCManager. Under this attribute current transaction is stored.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - get
```
public static EntityManagerFactory get()
```
    Returns EntityManagerFactory. Using default configuration.
    
    Returns:
    
    EntityManagerFactory or null.
  - get
```
public static EntityManagerFactory get(java.lang.String configName)
```
    Returns EntityManagerFactory.
    
    Parameters:
    
    configName - String configuration name. Default provider is used if null or empty string is passed.
    
    Returns:
    
    EntityManagerFactory or null.
  - getEntityManager
```
public static EntityManager getEntityManager()
                                      throws PersistenceException
```
    Returns EntityManager for persistence operations. Using default configuration.
    
    Returns:
    
    EntityManager for persistence operations.
    
    Throws:
    
    PersistenceException - if unable to acquire EntityManager.
  - getEntityManager
```
public static EntityManager getEntityManager(java.lang.String configName)
                                      throws PersistenceException
```
    Returns EntityManager for persistence operations.
    
    Parameters:
    
    configName - String configuration name. Default provider is used if null or empty string is passed.
    
    Returns:
    
    EntityManager for persistence operations.
    
    Throws:
    
    PersistenceException - if unable to acquire EntityManager.
  - returnEntityManager
```
public static void returnEntityManager(EntityManager em)
```
    Closes EntityManager. Using default configuration.
    
    Parameters:
    
    em - EntityManager which should be closed.
  - returnEntityManager
```
public static void returnEntityManager(java.lang.String configName,
                                       EntityManager em)
```
    Closes EntityManager.
    
    Parameters:
    
    configName - String configuration name. Default provider is used if null or empty string is passed.
    
    em - EntityManager which should be closed.
  - getTransaction
```
public static java.lang.Object getTransaction(EntityManager em)
                                       throws java.lang.Exception
```
    Returns started transaction. Using default configuration.
    
    Parameters:
    
    em - EntityManager needed if joining to existing transaction or starting transaction locally.
    
    Returns:
    
    Object Already started transaction for persistence operations.
    
    Throws:
    
    java.lang.Exception - if unable to acquire or open transaction.
  - getTransaction
```
public static java.lang.Object getTransaction(java.lang.String configName,
                                              EntityManager em)
                                       throws java.lang.Exception
```
    Returns started transaction.
    
    Parameters:
    
    configName - String configuration name. Default provider is used if null or empty string is passed.
    
    em - EntityManager needed if joining to existing transaction or starting transaction locally.
    
    Returns:
    
    Object Already started transaction for persistence operations.
    
    Throws:
    
    java.lang.Exception - if unable to acquire or open transaction.
  - commitTransaction
```
public static void commitTransaction(java.lang.Object tx)
                              throws java.lang.Exception
```
    Commits specified transaction. Using default configuration.
    
    Parameters:
    
    tx - Object transaction to be commited.
    
    Throws:
    
    java.lang.Exception - occured while committing transaction.
  - commitTransaction
```
public static void commitTransaction(java.lang.String configName,
                                     java.lang.Object tx)
                              throws java.lang.Exception
```
    Commits specified transaction.
    
    Parameters:
    
    configName - String configuration name. Default provider is used if null or empty string is passed.
    
    tx - Object transaction to be commited.
    
    Throws:
    
    java.lang.Exception - occured while committing transaction.
  - rollbackTransaction
```
public static void rollbackTransaction(java.lang.Object tx)
```
    Rolls back specified transaction. Using default configuration.
    
    Parameters:
    
    tx - Object transaction to be rolled back.
  - rollbackTransaction
```
public static void rollbackTransaction(java.lang.String configName,
                                       java.lang.Object tx)
```
    Rolls back specified transaction.
    
    Parameters:
    
    configName - String configuration name. Default provider is used if null or empty string is passed.
    
    tx - Object transaction to be rolled back.

Class EMF

Field Summary

Method Summary

Field Detail

JPA_PREFIX

EMF_PROVIDER

JPA_EMF_PROVIDER

TRANSACTION_ATTR

Method Detail

get

get

getEntityManager

getEntityManager

returnEntityManager

returnEntityManager

getTransaction

getTransaction

commitTransaction

commitTransaction

rollbackTransaction

rollbackTransaction