hadoop FSEditLogOpCodes 源码

haddop FSEditLogOpCodes 代码

文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLogOpCodes.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hdfs.server.namenode;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.*;

/**
 * Op codes for edits file
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
public enum FSEditLogOpCodes {
  // last op code in file
  OP_ADD                        ((byte)  0, AddOp.class),
  // deprecated operation
  OP_RENAME_OLD                 ((byte)  1, RenameOldOp.class),
  OP_DELETE                     ((byte)  2, DeleteOp.class),
  OP_MKDIR                      ((byte)  3, MkdirOp.class),
  OP_SET_REPLICATION            ((byte)  4, SetReplicationOp.class),
  @Deprecated OP_DATANODE_ADD   ((byte)  5), // obsolete
  @Deprecated OP_DATANODE_REMOVE((byte)  6), // obsolete
  OP_SET_PERMISSIONS            ((byte)  7, SetPermissionsOp.class),
  OP_SET_OWNER                  ((byte)  8, SetOwnerOp.class),
  OP_CLOSE                      ((byte)  9, CloseOp.class),
  OP_SET_GENSTAMP_V1            ((byte) 10, SetGenstampV1Op.class),
  OP_SET_NS_QUOTA               ((byte) 11, SetNSQuotaOp.class), // obsolete
  OP_CLEAR_NS_QUOTA             ((byte) 12, ClearNSQuotaOp.class), // obsolete
  OP_TIMES                      ((byte) 13, TimesOp.class), // set atime, mtime
  OP_SET_QUOTA                  ((byte) 14, SetQuotaOp.class),
  // filecontext rename
  OP_RENAME                     ((byte) 15, RenameOp.class),
  // concat files
  OP_CONCAT_DELETE              ((byte) 16, ConcatDeleteOp.class),
  OP_SYMLINK                    ((byte) 17, SymlinkOp.class),
  OP_GET_DELEGATION_TOKEN       ((byte) 18, GetDelegationTokenOp.class),
  OP_RENEW_DELEGATION_TOKEN     ((byte) 19, RenewDelegationTokenOp.class),
  OP_CANCEL_DELEGATION_TOKEN    ((byte) 20, CancelDelegationTokenOp.class),
  OP_UPDATE_MASTER_KEY          ((byte) 21, UpdateMasterKeyOp.class),
  OP_REASSIGN_LEASE             ((byte) 22, ReassignLeaseOp.class),
  OP_END_LOG_SEGMENT            ((byte) 23, EndLogSegmentOp.class),
  OP_START_LOG_SEGMENT          ((byte) 24, StartLogSegmentOp.class),
  OP_UPDATE_BLOCKS              ((byte) 25, UpdateBlocksOp.class),
  OP_CREATE_SNAPSHOT            ((byte) 26, CreateSnapshotOp.class),
  OP_DELETE_SNAPSHOT            ((byte) 27, DeleteSnapshotOp.class),
  OP_RENAME_SNAPSHOT            ((byte) 28, RenameSnapshotOp.class),
  OP_ALLOW_SNAPSHOT             ((byte) 29, AllowSnapshotOp.class),
  OP_DISALLOW_SNAPSHOT          ((byte) 30, DisallowSnapshotOp.class),
  OP_SET_GENSTAMP_V2            ((byte) 31, SetGenstampV2Op.class),
  OP_ALLOCATE_BLOCK_ID          ((byte) 32, AllocateBlockIdOp.class),
  OP_ADD_BLOCK                  ((byte) 33, AddBlockOp.class),
  OP_ADD_CACHE_DIRECTIVE        ((byte) 34, AddCacheDirectiveInfoOp.class),
  OP_REMOVE_CACHE_DIRECTIVE     ((byte) 35, RemoveCacheDirectiveInfoOp.class),
  OP_ADD_CACHE_POOL             ((byte) 36, AddCachePoolOp.class),
  OP_MODIFY_CACHE_POOL          ((byte) 37, ModifyCachePoolOp.class),
  OP_REMOVE_CACHE_POOL          ((byte) 38, RemoveCachePoolOp.class),
  OP_MODIFY_CACHE_DIRECTIVE     ((byte) 39, ModifyCacheDirectiveInfoOp.class),
  OP_SET_ACL                    ((byte) 40, SetAclOp.class),
  OP_ROLLING_UPGRADE_START      ((byte) 41, RollingUpgradeStartOp.class),
  OP_ROLLING_UPGRADE_FINALIZE   ((byte) 42, RollingUpgradeFinalizeOp.class),
  OP_SET_XATTR                  ((byte) 43, SetXAttrOp.class),
  OP_REMOVE_XATTR               ((byte) 44, RemoveXAttrOp.class),
  OP_SET_STORAGE_POLICY         ((byte) 45, SetStoragePolicyOp.class),
  OP_TRUNCATE                   ((byte) 46, TruncateOp.class),
  OP_APPEND                     ((byte) 47, AppendOp.class),
  OP_SET_QUOTA_BY_STORAGETYPE   ((byte) 48, SetQuotaByStorageTypeOp.class),
  OP_ADD_ERASURE_CODING_POLICY  ((byte) 49, AddErasureCodingPolicyOp.class),
  OP_ENABLE_ERASURE_CODING_POLICY((byte) 50, EnableErasureCodingPolicyOp.class),
  OP_DISABLE_ERASURE_CODING_POLICY((byte) 51,
      DisableErasureCodingPolicyOp.class),
  OP_REMOVE_ERASURE_CODING_POLICY((byte) 52, RemoveErasureCodingPolicyOp.class),

  // Note that the current range of the valid OP code is 0~127
  OP_INVALID                    ((byte) -1);

  private final byte opCode;
  private final Class<? extends FSEditLogOp> opClass;

  /**
   * Constructor
   *
   * @param opCode byte value of constructed enum
   */
  FSEditLogOpCodes(byte opCode) {
    this(opCode, null);
  }

  FSEditLogOpCodes(byte opCode, Class<? extends FSEditLogOp> opClass) {
    this.opCode = opCode;
    this.opClass = opClass;
  }

  /**
   * return the byte value of the enum
   *
   * @return the byte value of the enum
   */
  public byte getOpCode() {
    return opCode;
  }

  public Class<? extends FSEditLogOp> getOpClass() {
    return opClass;
  }

  private static final FSEditLogOpCodes[] VALUES;
  
  static {
    byte max = 0;
    for (FSEditLogOpCodes code : FSEditLogOpCodes.values()) {
      if (code.getOpCode() > max) {
        max = code.getOpCode();
      }
    }
    VALUES = new FSEditLogOpCodes[max + 1];
    for (FSEditLogOpCodes code : FSEditLogOpCodes.values()) {
      if (code.getOpCode() >= 0) {
        VALUES[code.getOpCode()] = code;
      }
    }
  }

  /**
   * Converts byte to FSEditLogOpCodes enum value
   *
   * @param opCode get enum for this opCode
   * @return enum with byte value of opCode
   */
  public static FSEditLogOpCodes fromByte(byte opCode) {
    if (opCode >= 0 && opCode < VALUES.length) {
      return VALUES[opCode];
    }
    return opCode == -1 ? OP_INVALID : null;
  }
}

相关信息

hadoop 源码目录

相关文章

hadoop AclEntryStatusFormat 源码

hadoop AclFeature 源码

hadoop AclStorage 源码

hadoop AclTransformation 源码

hadoop AuditLogger 源码

hadoop BackupImage 源码

hadoop BackupJournalManager 源码

hadoop BackupNode 源码

hadoop BackupState 源码

hadoop CacheManager 源码