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184 changes: 184 additions & 0 deletions
184
core/src/main/scala/org/apache/spark/internal/config/ConfigBuilder.scala
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| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.spark.internal.config | ||
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| import java.util.concurrent.TimeUnit | ||
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| import org.apache.spark.network.util.{ByteUnit, JavaUtils} | ||
|
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| private object ConfigHelpers { | ||
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| def toNumber[T](s: String, converter: String => T, key: String, configType: String): T = { | ||
| try { | ||
| converter(s) | ||
| } catch { | ||
| case _: NumberFormatException => | ||
| throw new IllegalArgumentException(s"$key should be $configType, but was $s") | ||
| } | ||
| } | ||
|
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| def toBoolean(s: String, key: String): Boolean = { | ||
| try { | ||
| s.toBoolean | ||
| } catch { | ||
| case _: IllegalArgumentException => | ||
| throw new IllegalArgumentException(s"$key should be boolean, but was $s") | ||
| } | ||
| } | ||
|
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| def stringToSeq[T](str: String, converter: String => T): Seq[T] = { | ||
| str.split(",").map(_.trim()).filter(_.nonEmpty).map(converter) | ||
| } | ||
|
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| def seqToString[T](v: Seq[T], stringConverter: T => String): String = { | ||
| v.map(stringConverter).mkString(",") | ||
| } | ||
|
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| def timeFromString(str: String, unit: TimeUnit): Long = JavaUtils.timeStringAs(str, unit) | ||
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| def timeToString(v: Long, unit: TimeUnit): String = TimeUnit.MILLISECONDS.convert(v, unit) + "ms" | ||
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| def byteFromString(str: String, unit: ByteUnit): Long = { | ||
| val (input, multiplier) = | ||
| if (str.length() > 0 && str.charAt(0) == '-') { | ||
| (str.substring(1), -1) | ||
| } else { | ||
| (str, 1) | ||
| } | ||
| multiplier * JavaUtils.byteStringAs(input, unit) | ||
| } | ||
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| def byteToString(v: Long, unit: ByteUnit): String = unit.convertTo(v, ByteUnit.BYTE) + "b" | ||
|
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| } | ||
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| /** | ||
| * A type-safe config builder. Provides methods for transforming the input data (which can be | ||
| * used, e.g., for validation) and creating the final config entry. | ||
| * | ||
| * One of the methods that return a [[ConfigEntry]] must be called to create a config entry that | ||
| * can be used with [[SparkConf]]. | ||
| */ | ||
| private[spark] class TypedConfigBuilder[T]( | ||
| val parent: ConfigBuilder, | ||
| val converter: String => T, | ||
| val stringConverter: T => String) { | ||
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| import ConfigHelpers._ | ||
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| def this(parent: ConfigBuilder, converter: String => T) = { | ||
| this(parent, converter, Option(_).map(_.toString).orNull) | ||
| } | ||
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| def transform(fn: T => T): TypedConfigBuilder[T] = { | ||
| new TypedConfigBuilder(parent, s => fn(converter(s)), stringConverter) | ||
| } | ||
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| def checkValues(validValues: Set[T]): TypedConfigBuilder[T] = { | ||
| transform { v => | ||
| if (!validValues.contains(v)) { | ||
| throw new IllegalArgumentException( | ||
| s"The value of ${parent.key} should be one of ${validValues.mkString(", ")}, but was $v") | ||
| } | ||
| v | ||
| } | ||
| } | ||
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| def toSequence: TypedConfigBuilder[Seq[T]] = { | ||
| new TypedConfigBuilder(parent, stringToSeq(_, converter), seqToString(_, stringConverter)) | ||
| } | ||
|
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| /** Creates a [[ConfigEntry]] that does not require a default value. */ | ||
| def optional: OptionalConfigEntry[T] = { | ||
| new OptionalConfigEntry[T](parent.key, converter, stringConverter, parent._doc, parent._public) | ||
| } | ||
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| /** Creates a [[ConfigEntry]] that has a default value. */ | ||
| def withDefault(default: T): ConfigEntry[T] = { | ||
| val transformedDefault = converter(stringConverter(default)) | ||
| new ConfigEntryWithDefault[T](parent.key, transformedDefault, converter, stringConverter, | ||
| parent._doc, parent._public) | ||
| } | ||
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| /** | ||
| * Creates a [[ConfigEntry]] that has a default value. The default value is provided as a | ||
| * [[String]] and must be a valid value for the entry. | ||
| */ | ||
| def withDefaultString(default: String): ConfigEntry[T] = { | ||
| val typedDefault = converter(default) | ||
| new ConfigEntryWithDefault[T](parent.key, typedDefault, converter, stringConverter, parent._doc, | ||
| parent._public) | ||
| } | ||
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| } | ||
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| /** | ||
| * Basic builder for Spark configurations. Provides methods for creating type-specific builders. | ||
| * | ||
| * @see TypedConfigBuilder | ||
| */ | ||
| private[spark] case class ConfigBuilder(key: String) { | ||
|
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| import ConfigHelpers._ | ||
|
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| var _public = true | ||
| var _doc = "" | ||
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| def internal: ConfigBuilder = { | ||
| _public = false | ||
| this | ||
| } | ||
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| def doc(s: String): ConfigBuilder = { | ||
| _doc = s | ||
| this | ||
| } | ||
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| def intConf: TypedConfigBuilder[Int] = { | ||
| new TypedConfigBuilder(this, toNumber(_, _.toInt, key, "int")) | ||
| } | ||
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| def longConf: TypedConfigBuilder[Long] = { | ||
| new TypedConfigBuilder(this, toNumber(_, _.toLong, key, "long")) | ||
| } | ||
|
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| def doubleConf: TypedConfigBuilder[Double] = { | ||
| new TypedConfigBuilder(this, toNumber(_, _.toDouble, key, "double")) | ||
| } | ||
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| def booleanConf: TypedConfigBuilder[Boolean] = { | ||
| new TypedConfigBuilder(this, toBoolean(_, key)) | ||
| } | ||
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| def stringConf: TypedConfigBuilder[String] = { | ||
| new TypedConfigBuilder(this, v => v) | ||
| } | ||
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| def timeConf(unit: TimeUnit): TypedConfigBuilder[Long] = { | ||
| new TypedConfigBuilder(this, timeFromString(_, unit), timeToString(_, unit)) | ||
| } | ||
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| def bytesConf(unit: ByteUnit): TypedConfigBuilder[Long] = { | ||
| new TypedConfigBuilder(this, byteFromString(_, unit), byteToString(_, unit)) | ||
| } | ||
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| def fallbackConf[T](fallback: ConfigEntry[T]): ConfigEntry[T] = { | ||
| new FallbackConfigEntry(key, _doc, _public, fallback) | ||
| } | ||
|
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| } |
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