spark ConfigProvider 源码
spark ConfigProvider 代码
文件路径：/core/src/main/scala/org/apache/spark/internal/config/ConfigProvider.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.internal.config
import java.util.{Map => JMap}
import org.apache.spark.SparkConf
/**
* A source of configuration values.
*/
private[spark] trait ConfigProvider {
def get(key: String): Option[String]
}
private[spark] class EnvProvider extends ConfigProvider {
override def get(key: String): Option[String] = sys.env.get(key)
}
private[spark] class SystemProvider extends ConfigProvider {
override def get(key: String): Option[String] = sys.props.get(key)
}
private[spark] class MapProvider(conf: JMap[String, String]) extends ConfigProvider {
override def get(key: String): Option[String] = Option(conf.get(key))
}
/**
* A config provider that only reads Spark config keys.
*/
private[spark] class SparkConfigProvider(conf: JMap[String, String]) extends ConfigProvider {
override def get(key: String): Option[String] = {
if (key.startsWith("spark.")) {
Option(conf.get(key)).orElse(SparkConf.getDeprecatedConfig(key, conf))
} else {
None
}
}
}
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