RecoveryOperation (Oracle - Berkeley DB Java API)
Date: 2010-04-12

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## com.sleepycat.db
Class RecoveryOperation

    java.lang.Object
      com.sleepycat.db.RecoveryOperation

    public final class RecoveryOperation

extends Object

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

Field Summary
`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
`static RecoveryOperation` | `fromFlag(int flag)` Internal: this is public only so it can be called from an internal package.
`String` | `toString()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, 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 String toString()

  Overrides:
    `toString` in class `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

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