spark Identifiable 源码
spark Identifiable 代码
文件路径：/mllib/src/main/scala/org/apache/spark/ml/util/Identifiable.scala
/*
* 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.spark.ml.util
import java.util.UUID
/**
* Trait for an object with an immutable unique ID that identifies itself and its derivatives.
*
* WARNING: There have not yet been final discussions on this API, so it may be broken in future
* releases.
*/
trait Identifiable {
/**
* An immutable unique ID for the object and its derivatives.
*/
val uid: String
override def toString: String = uid
}
object Identifiable {
/**
* Returns a random UID that concatenates the given prefix, "_", and 12 random hex chars.
*/
def randomUID(prefix: String): String = {
prefix + "_" + UUID.randomUUID().toString.takeRight(12)
}
}
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