Transaction (DataNucleus Core 3.2.10 API)

Field Summary

Fields
Modifier and Type Field and Description

static String TRANSACTION_ISOLATION_OPTION
Option to use when wanting to set the transaction isolation level.

Fields
Modifier and Type	Field and Description
`static String`	`TRANSACTION_ISOLATION_OPTION` Option to use when wanting to set the transaction isolation level.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addTransactionEventListener(TransactionEventListener listener)` Adds a transaction listener.
`void`	`begin()` Begin a transaction.
`void`	`bindTransactionEventListener(TransactionEventListener listener)` Listeners that are never cleared, and invoked for all transactions
`void`	`close()` Method to inform the transaction that it is closed.
`void`	`commit()` Commit the current transaction.
`void`	`end()` Method to notify that the transaction is ended.
`void`	`flush()` Method to allow the transaction to flush any resources.
`boolean`	`getIsActive()` Return whether the transaction is active and return immediately.
`boolean`	`getNontransactionalRead()` If `true`, allows persistent instances to be read without a transaction active.
`boolean`	`getNontransactionalWrite()` If `true`, allows persistent instances to be written without a transaction active.
`boolean`	`getOptimistic()` Optimistic transactions do not hold data store locks until commit time.
`Map<String,Object>`	`getOptions()` Obtain all settings for this Transaction
`boolean`	`getRestoreValues()` Return the current value of the restoreValues property.
`boolean`	`getRetainValues()` If `true`, at commit time instances retain their field values.
`boolean`	`getRollbackOnly()` Returns the rollback-only status of the transaction.
`Boolean`	`getSerializeRead()` Accessor for the setting for whether to serialize read objects (lock them).
`Synchronization`	`getSynchronization()` The user-specified `Synchronization` instance for this `Transaction` instance.
`boolean`	`isActive()` Returns whether there is a transaction currently active.
`boolean`	`isCommitting()` Checks whether a transaction is committing.
`void`	`preFlush()` Method to notify that flush is started.
`void`	`removeTransactionEventListener(TransactionEventListener listener)` Removes the specified listener.
`void`	`rollback()` Rollback the current transaction.
`void`	`setNontransactionalRead(boolean nontransactionalRead)` If `true`, allow persistent instances to be read without a transaction active.
`void`	`setNontransactionalWrite(boolean nontransactionalWrite)` If `true`, allow persistent instances to be written without a transaction active.
`void`	`setOptimistic(boolean optimistic)` Optimistic transactions do not hold data store locks until commit time.
`void`	`setOption(String option, boolean value)`
`void`	`setOption(String option, int value)`
`void`	`setOption(String option, Object value)`
`void`	`setOption(String option, String value)`
`void`	`setRestoreValues(boolean restoreValues)` If `true`, at rollback, fields of newly persistent instances are restored to their values as of the beginning of the transaction, and the instances revert to transient.
`void`	`setRetainValues(boolean retainValues)` If `true`, at commit instances retain their values and the instances transition to persistent-nontransactional.
`void`	`setRollbackOnly()` Sets the rollback-only status of the transaction to `true`.
`void`	`setSerializeRead(Boolean serializeRead)` Mutator for whether to serialize (lock) any read objects in this transaction.
`void`	`setSynchronization(Synchronization sync)` The user can specify a `Synchronization` instance to be notified on transaction completions.

- Field Detail
  - TRANSACTION_ISOLATION_OPTION
```
static final String TRANSACTION_ISOLATION_OPTION
```
    Option to use when wanting to set the transaction isolation level.
    
    See Also:
    Constant Field Values
- Method Detail
  - close
```
void close()
```
    Method to inform the transaction that it is closed. This is only necessary for JBoss usage of JPA where it doesn't bother calling afterCompletion on the JTA txn until after it closes the EntityManager so we need a hook to inform the transaction that it is closed so ignore any subsequent afterCompletion.
  - begin
```
void begin()
```
    Begin a transaction. The type of transaction (datastore/optimistic) is determined by the setting of the Optimistic flag.
    
    Throws:
    
    NucleusUserException - if transactions are managed by a container in the managed environment, or if the transaction is already active.
  - commit
```
void commit()
```
    Commit the current transaction. The commit will trigger flushing the transaction, will invoke the preCommit, commit the resources and invoke postCommit listeners. If during flush or preCommit phases a NucleusUserException is raised, then the transaction will not complete and the transaction remains active. The NucleusUserException is cascaded to the caller.
    
    Throws:
    
    NucleusUserException - if transactions are managed by a container in the managed environment, or if the transaction is not active.
  - rollback
```
void rollback()
```
    Rollback the current transaction. The commit will trigger flushing the transaction, will invoke the preRollback, rollback the resources and invoke postRollback listeners. If during flush or preRollback phases a NucleusUserException is raised, then the transaction will not complete and the transaction remains active. The NucleusUserException is cascaded to the caller.
    
    Throws:
    
    NucleusUserException - if transactions are managed by a container in the managed environment, or if the transaction is not active.
  - isActive
```
boolean isActive()
```
    Returns whether there is a transaction currently active. This can also attempt to join to any underlying transaction if the implementation requires it. Use
```
getIsActive
```
    if you just want the active flag.
    Returns:
    Whether the transaction is active.
  - getIsActive
```
boolean getIsActive()
```
    Return whether the transaction is active and return immediately.
    
    Returns:
    Whether it is active
  - preFlush
```
void preFlush()
```
    Method to notify that flush is started.
  - flush
```
void flush()
```
    Method to allow the transaction to flush any resources.
  - end
```
void end()
```
    Method to notify that the transaction is ended.
  - getRollbackOnly
```
boolean getRollbackOnly()
```
    Returns the rollback-only status of the transaction. When begun, the rollback-only status is false. Either the application or the JDO implementation may set this flag using setRollbackOnly.
    
    Returns:
    Whether the transaction has been marked for rollback.
  - setRollbackOnly
```
void setRollbackOnly()
```
    Sets the rollback-only status of the transaction to true. After this flag is set to true, the transaction can no longer be committed.
    
    Throws:
    
    NucleusUserException - if the flag is true and an attempt is made to commit the txn
  - setNontransactionalRead
```
void setNontransactionalRead(boolean nontransactionalRead)
```
    If true, allow persistent instances to be read without a transaction active. If an implementation does not support this option, a
    
    Parameters:
    nontransactionalRead - Whether to have non-tx reads
    
    Throws:
    
    NucleusUserException - if not supported
  - getNontransactionalRead
```
boolean getNontransactionalRead()
```
    If true, allows persistent instances to be read without a transaction active.
    
    Returns:
    Whether we are allowing non-tx reads
  - setNontransactionalWrite
```
void setNontransactionalWrite(boolean nontransactionalWrite)
```
    If true, allow persistent instances to be written without a transaction active.
    
    Parameters:
    nontransactionalWrite - Whether requiring non-tx writes
    
    Throws:
    
    NucleusUserException - if not supported
  - getNontransactionalWrite
```
boolean getNontransactionalWrite()
```
    If true, allows persistent instances to be written without a transaction active.
    
    Returns:
    Whether we are allowing non-tx writes
  - setRetainValues
```
void setRetainValues(boolean retainValues)
```
    If true, at commit instances retain their values and the instances transition to persistent-nontransactional.
    
    Parameters:
    retainValues - the value of the retainValues property
    
    Throws:
    
    NucleusUserException - if not supported
  - getRetainValues
```
boolean getRetainValues()
```
    If true, at commit time instances retain their field values.
    
    Returns:
    the value of the retainValues property
  - setRestoreValues
```
void setRestoreValues(boolean restoreValues)
```
    If true, at rollback, fields of newly persistent instances are restored to their values as of the beginning of the transaction, and the instances revert to transient. Additionally, fields of modified instances of primitive types and immutable reference types are restored to their values as of the beginning of the transaction.
    If false, at rollback, the values of fields of newly persistent instances are unchanged and the instances revert to transient. Additionally, dirty instances transition to hollow.
    
    Parameters:
    restoreValues - the value of the restoreValues property
    
    Throws:
    
    NucleusUserException - if not supported
  - getRestoreValues
```
boolean getRestoreValues()
```
    Return the current value of the restoreValues property.
    
    Returns:
    the value of the restoreValues property
  - setOptimistic
```
void setOptimistic(boolean optimistic)
```
    Optimistic transactions do not hold data store locks until commit time.
    
    Parameters:
    optimistic - the value of the Optimistic flag.
    
    Throws:
    
    NucleusUserException - if not supported
  - getOptimistic
```
boolean getOptimistic()
```
    Optimistic transactions do not hold data store locks until commit time.
    
    Returns:
    the value of the Optimistic property.
  - setSerializeRead
```
void setSerializeRead(Boolean serializeRead)
```
    Mutator for whether to serialize (lock) any read objects in this transaction.
    
    Parameters:
    serializeRead - Whether to serialise (lock) any read objects
  - getSerializeRead
```
Boolean getSerializeRead()
```
    Accessor for the setting for whether to serialize read objects (lock them).
    
    Returns:
    the value of the serializeRead property
  - setSynchronization
```
void setSynchronization(Synchronization sync)
```
    The user can specify a Synchronization instance to be notified on transaction completions. The beforeCompletion method is called prior to flushing instances to the data store.
    The afterCompletion method is called after performing state transitions of persistent and transactional instances, following the data store commit or rollback operation.
    Only one Synchronization instance can be registered with the Transaction. If the application requires more than one instance to receive synchronization callbacks, then the single application instance is responsible for managing them, and forwarding callbacks to them.
    
    Parameters:
    sync - the Synchronization instance to be notified; null for none
  - getSynchronization
```
Synchronization getSynchronization()
```
    The user-specified Synchronization instance for this Transaction instance.
    
    Returns:
    the user-specified Synchronization instance.
  - isCommitting
```
boolean isCommitting()
```
    Checks whether a transaction is committing.
    
    Returns:
    Whether the transaction is committing
  - addTransactionEventListener
```
void addTransactionEventListener(TransactionEventListener listener)
```
    Adds a transaction listener. After commit or rollback, listeners are cleared
    
    Parameters:
    listener -
  - removeTransactionEventListener
```
void removeTransactionEventListener(TransactionEventListener listener)
```
    Removes the specified listener.
    
    Parameters:
    listener - Listener
  - bindTransactionEventListener
```
void bindTransactionEventListener(TransactionEventListener listener)
```
    Listeners that are never cleared, and invoked for all transactions
    
    Parameters:
    listener -
  - getOptions
```
Map<String,Object> getOptions()
```
    Obtain all settings for this Transaction
    
    Returns:
    a map with settings
  - setOption
```
void setOption(String option,
             int value)
```
  - setOption
```
void setOption(String option,
             boolean value)
```
  - setOption
```
void setOption(String option,
             String value)
```
  - setOption
```
void setOption(String option,
             Object value)
```

Interface Transaction

Field Summary

Method Summary

Field Detail

TRANSACTION_ISOLATION_OPTION

Method Detail

close

begin

commit

rollback

isActive

getIsActive

preFlush

flush

end

getRollbackOnly

setRollbackOnly

setNontransactionalRead

getNontransactionalRead

setNontransactionalWrite

getNontransactionalWrite

setRetainValues

getRetainValues

setRestoreValues

getRestoreValues

setOptimistic

getOptimistic

setSerializeRead

getSerializeRead

setSynchronization

getSynchronization

isCommitting

addTransactionEventListener

removeTransactionEventListener

bindTransactionEventListener

getOptions

setOption

setOption

setOption

setOption