Package com.thingworx.persistence

Class TransactionFactory

java.lang.Object

com.thingworx.persistence.TransactionFactory

@ThingworxExtensionApiClass(since={6,6},
                            canInstantiate=true)
public class TransactionFactory
extends java.lang.Object

A front-end class that provides convenience methods for managing persistence transactions, particularly in the context of a request.

The TransactionFactory exposes a number of convenience methods specifically for managing transactions in a persistence store. This is necessary when making changes to a resource that is persisted, such as the creation of entities. In some situations the transaction is generated automatically by the Platform (i.e., when servicing a request), in which case the default transaction can be used. For any code that executes outside of a request or in a separate thread, it is necessary to create your own transaction.

Transactions can be nested safely. The transaction success status owned by ThreadLocalContext is separate from this nesting logic and should indicate overall success of the process and not the individual transaction.

The following is an example of using transactions:

  try {
      String username = "user";
      String groupName = "group";
      ThreadLocalContext.setSecurityContext(SecurityContext.createSystemUserContext());
      TransactionFactory.beginTransactionRequired();
      EntityServices entityServices = (EntityServices) EntityUtilities.findEntity("EntityServices", ThingworxRelationshipTypes.Resource);
      entityServices.CreateUser(username, null, null, username);
      User user = (User) EntityUtilities.findEntity(username, ThingworxRelationshipTypes.User);
      Group grp = (Group) EntityUtilities.findEntity(groupName, ThingworxRelationshipTypes.Group);
      if (grp != null) {
          user.addGroup(grp);
      }
  } catch (Exception e) {
      ThreadLocalContext.setTransactionSuccess(false);
      TransactionFactory.failure();
  } finally {
      TransactionFactory.endTransactionRequired();
      ThreadLocalContext.clearSecurityContext();
  }
  

See Also:

ThreadLocalContext

Constructor Summary

Constructors

Constructor	Description
TransactionFactory()

Method Summary

Modifier and Type	Method	Description
static void	beginTransactionRequired()	Begin a transaction
static void	endTransactionRequired()	End the transaction
static void	failure()	Fail the transaction

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionFactory

public TransactionFactory()

Method Detail

failure

@ThingworxExtensionApiMethod(since={6,6})
public static void failure()

Fail the transaction

beginTransactionRequired

@ThingworxExtensionApiMethod(since={6,6})
public static void beginTransactionRequired()
                                     throws java.lang.Exception

Begin a transaction

Throws:

java.lang.Exception - If an error occurs

endTransactionRequired

@ThingworxExtensionApiMethod(since={6,6})
public static void endTransactionRequired()

End the transaction