head 1.4; access; symbols RPM_4_1:1.1.1.2 RPM_4_0_4:1.1.1.2 RPM_4_0_3:1.1.1.1 RPM:1.1.1; locks; strict; comment @# @; 1.4 date 2003.08.24.12.43.13; author rse; state dead; branches; next 1.3; 1.3 date 2003.08.24.12.33.49; author rse; state Exp; branches; next 1.2; 1.2 date 2003.08.24.12.25.46; author rse; state dead; branches; next 1.1; 1.1 date 2001.07.23.20.45.37; author rse; state Exp; branches 1.1.1.1; next ; 1.1.1.1 date 2001.07.23.20.45.37; author rse; state Exp; branches; next 1.1.1.2; 1.1.1.2 date 2002.01.08.00.30.10; author rse; state Exp; branches; next ; desc @@ 1.4 log @Resolve: RPM 4.1 -> RPM 4.1.1 @ text @ Berkeley DB: DbEnv.set_tx_recover

DbEnv.set_tx_recover

 APIRef 

import com.sleepycat.db.*;


public interface DbTxnRecover
{
    public abstract int
      tx_recover(DbEnv dbenv, Dbt log_rec, DbLsn lsn, int op);
}
public class DbEnv
{
    public void set_tx_recover(DbTxnRecover tx_recover)
	throws DbException;
    ...
}

Description

Set the application's method to be called during transaction abort and recovery. This method must return 0 on success and either errno or a value outside of the Berkeley DB error name space on failure. It takes four arguments:

dbenv
A Berkeley DB environment.

log_rec
A log record.

lsn
A log sequence number.

op
One of the following values:

Db.DB_TXN_BACKWARD_ROLL
The log is being read backward to determine which transactions have been committed and to abort those operations that were not; undo the operation described by the log record.

Db.DB_TXN_FORWARD_ROLL
The log is being played forward; redo the operation described by the log record.

Db.DB_TXN_ABORT
The log is being read backward during a transaction abort; undo the operation described by the log record.

Db.DB_TXN_APPLY
The log is being applied on a replica site; redo the operation described by the log record.

The Db.DB_TXN_FORWARD_ROLL and Db.DB_TXN_APPLY operations frequently imply the same actions, redoing changes that appear in the log record. The macro DB_REDO(op) checks that the operation is one of Db.DB_TXN_FORWARD_ROLL or Db.DB_TXN_APPLY, and should be used in the recovery code to refer to the conditions under which operations should be redone. Similarly, the macro DB_UNDO(op) checks if the operation is one of Db.DB_TXN_BACKWARD_ROLL or Db.DB_TXN_ABORT.

The DbEnv.set_tx_recover interface may be used only to configure Berkeley DB before the DbEnv.open interface is called.

The DbEnv.set_tx_recover method throws an exception that encapsulates a non-zero error value on failure.

Errors

The DbEnv.set_tx_recover method may fail and throw an exception encapsulating a non-zero error for the following conditions:

EINVAL
An invalid flag value or parameter was specified.

Called after DbEnv.open was called.

The DbEnv.set_tx_recover method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the DbEnv.set_tx_recover method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.

Class

DbEnv, DbTxn

See Also

DbEnv.set_tx_max, DbEnv.set_tx_timestamp, DbTxn.abort, DbEnv.txn_begin, DbEnv.txn_checkpoint, DbTxn.commit, DbTxn.discard, DbTxn.id, DbTxn.prepare, DbEnv.txn_recover, DbTxn.set_timeout and DbEnv.txn_stat.

APIRef

Copyright Sleepycat Software @ 1.3 log @Resolve: RPM 4.0.5 -> RPM 4.1 @ text @@ 1.2 log @Resolve: RPM 4.0.4 -> RPM 4.0.5 @ text @d1 1 a1 1 d17 1 a17 1 APIRef d26 2 a27 2 public abstract int tx_recover(DbEnv dbenv, Dbt log_rec, DbLsn lsn, int op); d31 3 a33 3 public void set_tx_recover(DbTxnRecover tx_recover) throws DbException; ... d54 2 d58 7 d92 1 d97 1 a97 1 APIRef @ 1.1 log @Initial revision @ text @d1 1 a1 1 @ 1.1.1.1 log @Import: RPM 4.0.3 @ text @@ 1.1.1.2 log @Import: RPM 4.0.4 @ text @d1 1 a1 1 d17 1 a17 1 APIRef d26 2 a27 2 public abstract int tx_recover(DbEnv dbenv, Dbt log_rec, DbLsn lsn, int op); d31 3 a33 3 public void set_tx_recover(DbTxnRecover tx_recover) throws DbException; ... a53 2

Db.DB_TXN_APPLY
The log is being applied on a replica site; redo the operation described by the log record. a55 7

The Db.DB_TXN_FORWARD_ROLL and Db.DB_TXN_APPLY operations frequently imply the same actions, redoing changes that appear in the log record. The macro DB_REDO(op) checks that the operation is one of Db.DB_TXN_FORWARD_ROLL or Db.DB_TXN_APPLY, and should be used in the recovery code to refer to the conditions under which operations should be redone. Similarly, the macro DB_UNDO(op) checks if the operation is one of Db.DB_TXN_BACKWARD_ROLL or Db.DB_TXN_ABORT. a82 1 DbTxn.set_timeout d87 1 a87 1 APIRef @