LocalKey.java

//  Copyright 2017 Twitter. All rights reserved.
//
//  Licensed 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 com.twitter.heron.scheduler.local;

import com.twitter.heron.spi.common.Key;

/**
 * Keys specific to the local scheduler
 */
public enum LocalKey {
  // config key for specifying the working directory of a topology
  WORKING_DIRECTORY("heron.scheduler.local.working.directory",
      "${HOME}/.herondata/topologies/${CLUSTER}/${ROLE}/${TOPOLOGY}");

  private final String value;
  private final Key.Type type;
  private final Object defaultValue;

  LocalKey(String value, String defaultValue) {
    this.value = value;
    this.type = Key.Type.STRING;
    this.defaultValue = defaultValue;
  }

  public String value() {
    return value;
  }

  public Object getDefault() {
    return defaultValue;
  }

  public String getDefaultString() {
    if (type != Key.Type.STRING) {
      throw new IllegalAccessError(String.format(
          "Config Key %s is type %s, getDefaultString() not supported", this.name(), this.type));
    }
    return (String) this.defaultValue;
  }
}