Package com.sleepycat.collections

Class CurrentTransaction

java.lang.Object
com.sleepycat.collections.CurrentTransaction
public class CurrentTransaction extends Object
Provides access to the current transaction for the current thread within the context of a Berkeley DB environment. This class provides explicit transaction control beyond that provided by the TransactionRunner class. However, both methods of transaction control manage per-thread transactions.

  • Method Details

    • getInstance

      public static CurrentTransaction getInstance(Environment env)
      Gets the CurrentTransaction accessor for a specified Berkeley DB environment. This method always returns the same reference when called more than once with the same environment parameter.
      Parameters:
      env - is an open Berkeley DB environment.
      Returns:
      the CurrentTransaction accessor for the given environment, or null if the environment is not transactional.

    • getEnvironment

      public final Environment getEnvironment()
      Returns the underlying Berkeley DB environment.

    • getTransaction

      public final Transaction getTransaction()
      Returns the transaction associated with the current thread for this environment, or null if no transaction is active.

    • beginTransaction

      public final Transaction beginTransaction(TransactionConfig config) throws DatabaseException
      Begins a new transaction for this environment and associates it with the current thread. If a transaction is already active for this environment and thread, a nested transaction will be created.
      Parameters:
      config - the transaction configuration used for calling Environment.beginTransaction(com.sleepycat.db.Transaction, com.sleepycat.db.TransactionConfig), or null to use the default configuration.
      Returns:
      the new transaction.
      Throws:
      DatabaseException - if the transaction cannot be started, in which case any existing transaction is not affected.
      IllegalStateException - if a transaction is already active and nested transactions are not supported by the environment.

    • commitTransaction

      public final Transaction commitTransaction() throws DatabaseException, IllegalStateException
      Commits the transaction that is active for the current thread for this environment and makes the parent transaction (if any) the current transaction.
      Returns:
      the parent transaction or null if the committed transaction was not nested.
      Throws:
      DatabaseException - if an error occurs committing the transaction. The transaction will still be closed and the parent transaction will become the current transaction.
      IllegalStateException - if no transaction is active for the current thread for this environment.

    • abortTransaction

      public final Transaction abortTransaction() throws DatabaseException, IllegalStateException
      Aborts the transaction that is active for the current thread for this environment and makes the parent transaction (if any) the current transaction.
      Returns:
      the parent transaction or null if the aborted transaction was not nested.
      Throws:
      DatabaseException - if an error occurs aborting the transaction. The transaction will still be closed and the parent transaction will become the current transaction.
      IllegalStateException - if no transaction is active for the current thread for this environment.