org.neo4j.kernel.api

Interface KernelTransaction

All Known Implementing Classes:

KernelTransactionImplementation

public interface KernelTransaction

Represents a transaction of changes to the underlying graph. Actual changes are made in the data statements or schema statements created from this transaction context. Changes made within a transaction are visible to all operations within it. The reason for the separation between transactions and statements is isolation levels. While Neo4j is read-committed isolation, a read can potentially involve multiple operations (think of a cypher statement). Within that read, or statement if you will, the isolation level should be repeatable read, not read committed. Clearly separating between the concept of a transaction and the concept of a statement allows us to cater to this type of isolation requirements. TODO currently a KernelTransaction is used both for building the statement logic (once per db), as well as being a transaction.

Method Summary

Methods

Modifier and Type	Method and Description
DataStatement	acquireDataStatement()
ReadStatement	acquireReadStatement()
SchemaStatement	acquireSchemaStatement()
void	commit() Commit this transaction, this will make the changes in this context visible to other transactions.
<RESULT,FAILURE extends KernelException> RESULT	execute(MicroTransaction<RESULT,FAILURE> transaction)
void	rollback() Roll back this transaction, undoing any changes that have been made.

Method Detail

acquireReadStatement

ReadStatement acquireReadStatement()

acquireDataStatement

DataStatement acquireDataStatement()
                                   throws InvalidTransactionTypeException

Throws:

InvalidTransactionTypeException

acquireSchemaStatement

SchemaStatement acquireSchemaStatement()
                                       throws InvalidTransactionTypeException

Throws:

InvalidTransactionTypeException

commit

void commit()
            throws TransactionFailureException

Commit this transaction, this will make the changes in this context visible to other transactions.

Throws:

TransactionFailureException

rollback

void rollback()
              throws TransactionFailureException

Roll back this transaction, undoing any changes that have been made.

Throws:

TransactionFailureException

execute

<RESULT,FAILURE extends KernelException> RESULT execute(MicroTransaction<RESULT,FAILURE> transaction)
               throws FAILURE extends KernelException

Throws:

FAILURE extends KernelException