Class RawTransaction

java.lang.Object
org.apache.derby.iapi.services.monitor.DerbyObservable
org.apache.derby.iapi.store.raw.xact.RawTransaction
All Implemented Interfaces:
Transaction
Direct Known Subclasses:
Xact
public abstract class RawTransaction extends DerbyObservable implements Transaction
RawTransaction is the form of Transaction used within the raw store. This allows the break down of RawStore functionality into (at least) three modules (Transactions, Data, Log) without exposing internal information on the external interface.

The transaction will notify any Observer's just before the transaction is committed, aborted or a rollback to savepoint occurs. The argument passed to the update() method of the Observer's will be one of

  • RawTransaction.COMMIT - transaction is committing
  • RawTransaction.ABORT - transaction is aborting
  • RawTransaction.SAVEPOINTROLLBACK - transaction is being rolled back to a savepoint
The observer's must perform a value equality check (equals()) on the update arg to see why it is being notified.
See Also:

  • Field Details

    • COMMIT

      public static final Integer COMMIT

    • ABORT

      public static final Integer ABORT

    • SAVEPOINT_ROLLBACK

      public static final Integer SAVEPOINT_ROLLBACK

    • LOCK_ESCALATE

      public static final Integer LOCK_ESCALATE

    • observerException

      protected StandardException observerException

  • Constructor Details

    • RawTransaction

      public RawTransaction()

  • Method Details

    • getLockFactory

      public abstract LockFactory getLockFactory()
      Get the lock factory to be used during this transaction.

    • getDataFactory

      public abstract DataFactory getDataFactory()
      Get the data factory to be used during this transaction.

    • getLogFactory

      public abstract LogFactory getLogFactory()
      Get the log factory to be used during this transaction.

    • getLogBuffer

      public abstract DynamicByteArrayOutputStream getLogBuffer()
      Get the log buffer to be used during this transaction.

    • logAndUndo

      public abstract void logAndUndo(Compensation compensation, LogInstant undoInstant, LimitObjectInput in) throws StandardException
      Log a compensation operation and then action it in the context of this transaction. The CompensationOperation is logged in the transaction log file and then its doMe method is called to perform the required change. This compensation operation will rollback the change that was done by the Loggable Operation at undoInstant.
      Parameters:
      compensation - the Compensation Operation
      undoInstant - the LogInstant of the Loggable Operation this compensation operation is going to roll back
      in - optional data for the rollback operation
      Throws:
      StandardException - Standard Derby exception policy
      See Also:

    • setTransactionId

      public abstract void setTransactionId(Loggable beginXact, TransactionId shortId)
      Set the transactionId (Global and internal) of this transaction using a log record that contains the Global id

    • getId

      public abstract TransactionId getId()
      Get the shortId of this transaction. May return null if transactio has no ID.

    • getGlobalId

      public abstract GlobalTransactionId getGlobalId()
      Get the shortId of this transaction. May return null if transactio has no ID.
      Specified by:
      getGlobalId in interface Transaction

    • addUpdateTransaction

      public abstract void addUpdateTransaction(int transactionStatus)
      Add this raw transaction on to the list of update transaction

    • removeUpdateTransaction

      public abstract void removeUpdateTransaction()
      Remove this raw transaction from the list of update transaction

    • prepareTransaction

      public abstract void prepareTransaction()
      Change the state of transaction in table to prepare.

    • setFirstLogInstant

      public abstract void setFirstLogInstant(LogInstant instant)
      Set the log instant for the first log record written by this transaction.

    • getFirstLogInstant

      public abstract LogInstant getFirstLogInstant()
      Get the log instant for the first log record written by this transaction.

    • setLastLogInstant

      public abstract void setLastLogInstant(LogInstant instant)
      Set the log instant for the last log record written by this transaction.

    • getLastLogInstant

      public abstract LogInstant getLastLogInstant()
      Get the log instant for the last log record written by this transaction. If the transaction is unclear what its last log instant is, than it may return null.

    • checkLogicalOperationOk

      public void checkLogicalOperationOk() throws StandardException
      Check to see if a logical operation is allowed by this transaction, throws a TransactionExceotion if it isn't. This implementation allows logical operations. Transactions that need to disallow logical operations should hide this method.
      Throws:
      StandardException - Standard Derby error policy,

    • recoveryRollbackFirst

      public boolean recoveryRollbackFirst()
      Return true if this transaction should be rolled back first in recovery. This implementation returns false. Transactions that need to rollback first during recovery should hide this method.

    • reprepare

      public abstract void reprepare() throws StandardException
      During recovery re-prepare a transaction.

      After redo() and undo(), this routine is called on all outstanding in-doubt (prepared) transactions. This routine re-acquires all logical write locks for operations in the xact, and then modifies the transaction table entry to make the transaction look as if it had just been prepared following startup after recovery.

      Throws:
      StandardException - Standard exception policy.

    • setObserverException

      public void setObserverException(StandardException se)
      Allow an Observer to indicate an exception to the transaction that is raised in its update() method.

    • startNestedTopTransaction

      public abstract RawTransaction startNestedTopTransaction() throws StandardException
      Start a nested top transaction. A nested top transaction behaves exactly like a user transaction. Nested top transaction allow system type work to proceed in a separate transaction to the current user transaction and be committed independently of the user transaction (usually before the user transaction). Only one nested top transaction can be active in a context at any one time. After a commit the transaction may be re-used. A nested top transaction conflicts on the logical locks of its "parent" transaction.
      Throws:
      StandardException - Standard Derby error policy

    • openDroppedContainer

      public abstract RawContainerHandle openDroppedContainer(ContainerKey containerId, LockingPolicy locking) throws StandardException
      Open a container that may be dropped - use only by logging and recovery. During recovery redo, a log record may refer to a container that has long been dropped. This interface is provided so a dropped container may be opened. If the container has been dropped and is known to be committed, then even if we open the dropped container with forUpdate true, the container will be silently opened as read only. Logging and recovery code always check for committed drop status. Anybody else wanting to use this interface must keep this in mind.
      Throws:
      StandardException - Standard Derby exception policy

    • reCreateContainerForRedoRecovery

      public abstract void reCreateContainerForRedoRecovery(long segmentId, long containerId, ByteArray containerInfo) throws StandardException
      Recreate a container during redo recovery. Used during redo recovery when processing log records trying to create a container, but no container is found in the db.
      Throws:
      StandardException - Standard Derby exception policy

    • statusForBeginXactLog

      protected abstract int statusForBeginXactLog()
      Status that needs to go into the begin transaction log record, if there is one, to help with recovery

    • statusForEndXactLog

      protected abstract int statusForEndXactLog()
      Status that needs to go into the end transaction log record, if there is one, to help with recovery

    • inAbort

      public abstract boolean inAbort()
      Is the transaction in the middle of an abort.

    • handlesPostTerminationWork

      public abstract boolean handlesPostTerminationWork()
      Can this transaction handles post termination work

    • recoveryTransaction

      public abstract void recoveryTransaction()
      Make this transaction aware that it is being used by recovery

    • notifyObservers

      public void notifyObservers(Object arg)
      Allow my users to notigy my observers.
      Overrides:
      notifyObservers in class DerbyObservable
      Parameters:
      arg - Extra information to be passed to the observer's callback method.

    • inRollForwardRecovery

      public abstract boolean inRollForwardRecovery()
      Retunrs true if the transaction is part of rollforward recovery

    • checkpointInRollForwardRecovery

      public abstract void checkpointInRollForwardRecovery(LogInstant cinstant, long redoLWM, long undoLWM) throws StandardException
      Redo a checkpoint during rollforward recovery.
      Parameters:
      cinstant - The LogInstant of the checkpoint
      redoLWM - Redo Low Water Mark in the check point record
      undoLWM - Undo Low Water Mark in the checkpoint
      Throws:
      StandardException - Exception encountered during checkpoint

    • blockBackup

      public abstract boolean blockBackup(boolean wait) throws StandardException
      Make the transaction block the online backup.
      Parameters:
      wait - if true, waits until the transaction can block the backup.
      Returns:
      true if the transaction blocked the backup. false otherwise.
      Throws:
      StandardException - if interrupted while waiting for the backup in progress to complete.

    • isBlockingBackup

      public abstract boolean isBlockingBackup()
      Check if the transaction is blocking the backup ?
      Returns:
      true if this transaction is blocking the backup, otherwise false