content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.metrics;
  
  /**
   * Metric information.
   */
  public final class MetricInfo {
    /**
     * The list of under filesystem operations triggered by master or workers.
     */
    public enum UfsOps {
      CLOSE("Close"),
      CONNECT_FROM_MASTER("ConnectFromMaster"),
      CONNECT_FROM_WORKER("ConnectFromWorker"),
      CREATE("Create"),
      DELETE_DIRECTORY("DeleteDirectory"),
      DELETE_FILE("DeleteFile"),
      EXISTS("Exists"),
      GET_BLOCK_SIZE_BYTE("GetBlockSizeByte"),
      GET_DIRECTORY_STATUS_("GetDirectoryStatus"),
      GET_FILE_LOCATIONS("GetFileLocations"),
      GET_FILE_STATUS("GetFileStatus"),
      GET_FINGERPRINT("GetFingerprint"),
      GET_SPACE("GetSpace"),
      GET_STATUS("GetStatus"),
      IS_DIRECTORY("IsDirectory"),
      IS_FILE("IsFile"),
      LIST_STATUS("ListStatus"),
      MKDIRS("Mkdirs"),
      OPEN("Open"),
      RENAME_DIRECTORY("RenameDirectory"),
      RENAME_FILE("RenameFile"),
      SET_OWNER("SetOwner"),
      SET_MODE("SetMode");
  
      private String mValue;
  
      /**
       * Creates the UFS operation type.
       *
       * @param value value of the operation
       */
      UfsOps(String value) {
        mValue = value;
      }
  
      @Override
      public String toString() {
        return mValue;
      }
    }
  
    // The aggregated metric of an operation targeting a specific UFS
    // triggered by the leading master.
    // TODO(lu) Aggregate the per ufs per op from master + worker + client metrics
    public static final String UFS_OP_PREFIX = "Master.PerUfsOp";
    public static final String UFS_OP_SAVED_PREFIX = "Master.PerUfsSavedOp";
  
    // Tags
    public static final String TAG_UFS = "UFS";
    public static final String TAG_UFS_TYPE = "UFS_TYPE";
    public static final String TAG_USER = "User";
  
    // Metric name component
    public static final String TIER = "Tier";
  
    private MetricInfo() {} // prevent instantiation
  }
  