org.rocksdb.WALRecoveryMode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of rocksdbjni Show documentation

RocksDB fat jar that contains .so files for linux32 and linux64 (glibc and musl-libc), jnilib files for Mac OSX, and a .dll for Windows x64.

The newest version!

// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

package org.rocksdb;

/**
 * The WAL Recover Mode
 */
public enum WALRecoveryMode {

  /**
   * Original levelDB recovery
   *
   * We tolerate incomplete record in trailing data on all logs
   * Use case : This is legacy behavior (default)
   */
  TolerateCorruptedTailRecords((byte)0x00),

  /**
   * Recover from clean shutdown
   *
   * We don't expect to find any corruption in the WAL
   * Use case : This is ideal for unit tests and rare applications that
   * can require high consistency guarantee
   */
  AbsoluteConsistency((byte)0x01),

  /**
   * Recover to point-in-time consistency
   * We stop the WAL playback on discovering WAL inconsistency
   * Use case : Ideal for systems that have disk controller cache like
   * hard disk, SSD without super capacitor that store related data
   */
  PointInTimeRecovery((byte)0x02),

  /**
   * Recovery after a disaster
   * We ignore any corruption in the WAL and try to salvage as much data as
   * possible
   * Use case : Ideal for last ditch effort to recover data or systems that
   * operate with low grade unrelated data
   */
  SkipAnyCorruptedRecords((byte)0x03);

  private byte value;

  WALRecoveryMode(final byte value) {
    this.value = value;
  }

  /**
   * Returns the byte value of the enumerations value.
   *
   * @return byte representation
   */
  public byte getValue() {
    return value;
  }

  /**
   * Get the WALRecoveryMode enumeration value by
   * passing the byte identifier to this method.
   *
   * @param byteIdentifier of WALRecoveryMode.
   *
   * @return WALRecoveryMode instance.
   *
   * @throws IllegalArgumentException If WALRecoveryMode cannot be found for the
   *   provided byteIdentifier
   */
  public static WALRecoveryMode getWALRecoveryMode(final byte byteIdentifier) {
    for (final WALRecoveryMode walRecoveryMode : WALRecoveryMode.values()) {
      if (walRecoveryMode.getValue() == byteIdentifier) {
        return walRecoveryMode;
      }
    }

    throw new IllegalArgumentException(
        "Illegal value provided for WALRecoveryMode.");
  }
}