com.sleepycat.db

Class RecoveryOperation

java.lang.Object

com.sleepycat.db.RecoveryOperation

public final class RecoveryOperation
extends java.lang.Object

The recovery operation being performed when LogRecordHandler.handleLogRecord is called.

Field Summary

Fields

Modifier and Type	Field and Description
static RecoveryOperation	ABORT The log is being read backward during a transaction abort; undo the operation described by the log record.
static RecoveryOperation	APPLY The log is being applied on a replica site; redo the operation described by the log record.
static RecoveryOperation	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.
static RecoveryOperation	FORWARD_ROLL The log is being played forward; redo the operation described by the log record.
static RecoveryOperation	PRINT The log is being printed for debugging purposes; print the contents of this log record in the desired format.

Method Summary

Modifier and Type	Method and Description
static RecoveryOperation	fromFlag(int flag) Internal: this is public only so it can be called from an internal package.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

BACKWARD_ROLL

public static final RecoveryOperation 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.

FORWARD_ROLL

public static final RecoveryOperation FORWARD_ROLL

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

The FORWARD_ROLL and APPLY operations frequently imply the same actions, redoing changes that appear in the log record, although if a recovery function is to be used on a replication client where reads may be taking place concurrently with the processing of incoming messages, APPLY operations should also perform appropriate locking.

ABORT

public static final RecoveryOperation ABORT

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

APPLY

public static final RecoveryOperation APPLY

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

The FORWARD_ROLL and APPLY operations frequently imply the same actions, redoing changes that appear in the log record, although if a recovery function is to be used on a replication client where reads may be taking place concurrently with the processing of incoming messages, APPLY operations should also perform appropriate locking.

PRINT

public static final RecoveryOperation PRINT

The log is being printed for debugging purposes; print the contents of this log record in the desired format.

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

fromFlag

public static RecoveryOperation fromFlag(int flag)

Internal: this is public only so it can be called from an internal package.

Parameters:

flag - the internal flag value to be wrapped in a RecoveryException object