org.firebirdsql.gds.ng

## Interface FbTransaction

- All Superinterfaces:
    ExceptionListenable
  All Known Subinterfaces:
    FbWireTransaction
  All Known Implementing Classes:
    AbstractFbTransaction, JnaTransaction, V10Transaction

      public interface FbTransaction
      extends ExceptionListenable

  Handle for a transaction.

  All methods defined in this interface are required to notify all `SQLException` thrown from the methods defined in this interface.

  Since:
    3.0
  Author:
    Mark Rotteveel

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addTransactionListener(TransactionListener listener)` Adds a `TransactionListener` to the list of strongly referenced listeners.
    `void` | `addWeakTransactionListener(TransactionListener listener)` Adds a `TransactionListener` to the list of weakly referenced listeners.
    `void` | `commit()` Commit the transaction
    `int` | `getHandle()`
    `TransactionState` | `getState()`
    `long` | `getTransactionId()` Retrieves the transaction id.
    `byte[]` | `getTransactionInfo(byte[] requestItems, int maxBufferLength)` Performs a transaction info request.
    `<T> T` | `getTransactionInfo(byte[] requestItems, int bufferLength, InfoProcessor<T> infoProcessor)` Request transaction info.
    `void` | `prepare(byte[] recoveryInformation)` Prepare the transaction for two-phase commit/rollback.
    `void` | `removeTransactionListener(TransactionListener listener)` Removes the `TransactionListener` from the list of listeners.
    `void` | `rollback()` Roll back the transaction

    - ### Methods inherited from interface org.firebirdsql.gds.ng.listeners.ExceptionListenable

      `addExceptionListener, removeExceptionListener`

- - ### Method Detail

    - #### getState

          TransactionState getState()

      Returns:
        Current transaction state

    - #### getHandle

          int getHandle()

      Returns:
        The Firebird transaction handle identifier

    - #### addTransactionListener

          void addTransactionListener(TransactionListener listener)

      Adds a `TransactionListener` to the list of strongly referenced listeners.
      Parameters:
        `listener` - TransactionListener to register

    - #### addWeakTransactionListener

          void addWeakTransactionListener(TransactionListener listener)

      Adds a `TransactionListener` to the list of weakly referenced listeners.

      If the listener is already strongly referenced, this call will be ignored

      Parameters:
        `listener` - TransactionListener to register

    - #### removeTransactionListener

          void removeTransactionListener(TransactionListener listener)

      Removes the `TransactionListener` from the list of listeners.
      Parameters:
        `listener` - TransactionListener to remove

    - #### commit

          void commit()
               throws java.sql.SQLException

      Commit the transaction
      Throws:
        `java.sql.SQLException`

    - #### rollback

          void rollback()
                 throws java.sql.SQLException

      Roll back the transaction
      Throws:
        `java.sql.SQLException`

    - #### prepare

          void prepare(byte[] recoveryInformation)
                throws java.sql.SQLException

      Prepare the transaction for two-phase commit/rollback.
      Parameters:
        `recoveryInformation` - Transaction recovery information (stored in RDB$TRANSACTION_DESCRIPTION of RDB$TRANSACTIONS), or `null` to prepare without recovery information.
      Throws:
        `java.sql.SQLException`

    - #### getTransactionInfo

          <T> T getTransactionInfo(byte[] requestItems,
                                   int bufferLength,
                                   InfoProcessor<T> infoProcessor)
                            throws java.sql.SQLException

      Request transaction info.
      Parameters:
        `requestItems` - Array of info items to request
        `bufferLength` - Response buffer length to use
        `infoProcessor` - Implementation of `InfoProcessor` to transform the info response
      Returns:
        Transformed info response of type T
      Throws:
        `java.sql.SQLException` - For errors retrieving or transforming the response.

    - #### getTransactionInfo

          byte[] getTransactionInfo(byte[] requestItems,
                                    int maxBufferLength)
                             throws java.sql.SQLException

      Performs a transaction info request.
      Parameters:
        `requestItems` - Information items to request
        `maxBufferLength` - Maximum response buffer length to use
      Returns:
        The response buffer (note: length is the actual length of the response, not `maxBufferLength`
      Throws:
        `java.sql.SQLException` - For errors retrieving the information.

    - #### getTransactionId

          long getTransactionId()
                         throws java.sql.SQLException

      Retrieves the transaction id.

      The transaction id is the database transaction id, not to be confused with the attachment level transaction handle provided by `getHandle()`.

      Returns:
        Database transaction id.
      Throws:
        `java.sql.SQLException`

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