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155
core/src/main/scala/com/pingcap/tispark/utils/ReflectionUtil.scala
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| /* | ||
| * | ||
| * Copyright 2021 PingCAP, Inc. | ||
| * | ||
| * 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, | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.pingcap.tispark.utils | ||
|
|
||
| import com.pingcap.tispark.TiSparkInfo | ||
| import org.apache.spark.sql.{SparkSession, TiContext} | ||
| import org.apache.spark.sql.catalyst.expressions.BasicExpression.TiExpression | ||
| import org.apache.spark.sql.catalyst.expressions.{Alias, ExprId, Expression, SortOrder} | ||
| import org.apache.spark.sql.catalyst.parser.ParserInterface | ||
| import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan | ||
| import org.apache.spark.sql.catalyst.rules.Rule | ||
| import org.slf4j.LoggerFactory | ||
|
|
||
| import java.io.File | ||
| import java.net.{URL, URLClassLoader} | ||
|
|
||
| /** | ||
| * ReflectionUtil is designed to reflect methods which differ across | ||
| * different Spark versions. Compatibility issues should be solved by | ||
| * reflections in future. | ||
| */ | ||
| object ReflectionUtil { | ||
| lazy val classLoader: URLClassLoader = { | ||
| val tisparkClassUrl = this.getClass.getProtectionDomain.getCodeSource.getLocation | ||
| val tisparkClassPath = new File(tisparkClassUrl.getFile) | ||
| logger.info(s"tispark class url: ${tisparkClassUrl.toString}") | ||
|
|
||
| val sparkWrapperClassURL: URL = if (tisparkClassPath.isDirectory) { | ||
| val classDir = new File( | ||
| s"${tisparkClassPath.getAbsolutePath}/../../../spark-wrapper/spark-${TiSparkInfo.SPARK_MAJOR_VERSION}/target/classes/") | ||
| if (!classDir.exists()) { | ||
| throw new Exception( | ||
| "cannot find spark wrapper classes! please compile the spark-wrapper project first!") | ||
| } | ||
| classDir.toURI.toURL | ||
| } else { | ||
| new URL( | ||
| s"jar:$tisparkClassUrl!/resources/spark-wrapper-spark-${TiSparkInfo.SPARK_MAJOR_VERSION | ||
| .replace('.', '_')}/") | ||
| } | ||
| logger.info(s"spark wrapper class url: ${sparkWrapperClassURL.toString}") | ||
|
|
||
| new URLClassLoader(Array(sparkWrapperClassURL), this.getClass.getClassLoader) | ||
| } | ||
| private val logger = LoggerFactory.getLogger(getClass.getName) | ||
| private val SPARK_WRAPPER_CLASS = "com.pingcap.tispark.SparkWrapper" | ||
| private val TI_BASIC_EXPRESSION_CLASS = | ||
| "org.apache.spark.sql.catalyst.expressions.TiBasicExpression" | ||
| private val TI_RESOLUTION_RULE_CLASS = | ||
| "org.apache.spark.sql.extensions.TiResolutionRule" | ||
| private val TI_RESOLUTION_RULE_V2_CLASS = | ||
| "org.apache.spark.sql.extensions.TiResolutionRuleV2" | ||
| private val TI_PARSER_CLASS = | ||
| "org.apache.spark.sql.extensions.TiParser" | ||
| private val TI_DDL_RULE_CLASS = | ||
| "org.apache.spark.sql.extensions.TiDDLRule" | ||
|
|
||
| def newAlias(child: Expression, name: String): Alias = { | ||
| classLoader | ||
| .loadClass(SPARK_WRAPPER_CLASS) | ||
| .getDeclaredMethod("newAlias", classOf[Expression], classOf[String]) | ||
| .invoke(null, child, name) | ||
| .asInstanceOf[Alias] | ||
| } | ||
|
|
||
| def newAlias(child: Expression, name: String, exprId: ExprId): Alias = { | ||
| classLoader | ||
| .loadClass(SPARK_WRAPPER_CLASS) | ||
| .getDeclaredMethod("newAlias", classOf[Expression], classOf[String], classOf[ExprId]) | ||
| .invoke(null, child, name, exprId) | ||
| .asInstanceOf[Alias] | ||
| } | ||
|
|
||
| def copySortOrder(sortOrder: SortOrder, child: Expression): SortOrder = { | ||
| classLoader | ||
| .loadClass(SPARK_WRAPPER_CLASS) | ||
| .getDeclaredMethod("copySortOrder", classOf[SortOrder], classOf[Expression]) | ||
| .invoke(null, sortOrder, child) | ||
| .asInstanceOf[SortOrder] | ||
| } | ||
|
|
||
| def trimNonTopLevelAliases(e: Expression): Expression = { | ||
| classLoader | ||
| .loadClass(SPARK_WRAPPER_CLASS) | ||
| .getDeclaredMethod("trimNonTopLevelAliases", classOf[Expression]) | ||
| .invoke(null, e) | ||
| .asInstanceOf[Expression] | ||
| } | ||
|
|
||
| def callTiBasicExpressionConvertToTiExpr(expr: Expression): Option[TiExpression] = { | ||
| classLoader | ||
| .loadClass(TI_BASIC_EXPRESSION_CLASS) | ||
| .getDeclaredMethod("convertToTiExpr", classOf[Expression]) | ||
| .invoke(null, expr) | ||
| .asInstanceOf[Option[TiExpression]] | ||
| } | ||
|
|
||
| def newTiResolutionRule( | ||
| getOrCreateTiContext: SparkSession => TiContext, | ||
| sparkSession: SparkSession): Rule[LogicalPlan] = { | ||
| classLoader | ||
| .loadClass(TI_RESOLUTION_RULE_CLASS) | ||
| .getDeclaredConstructor(classOf[SparkSession => TiContext], classOf[SparkSession]) | ||
| .newInstance(getOrCreateTiContext, sparkSession) | ||
| .asInstanceOf[Rule[LogicalPlan]] | ||
| } | ||
|
|
||
| def newTiResolutionRuleV2( | ||
| getOrCreateTiContext: SparkSession => TiContext, | ||
| sparkSession: SparkSession): Rule[LogicalPlan] = { | ||
| classLoader | ||
| .loadClass(TI_RESOLUTION_RULE_V2_CLASS) | ||
| .getDeclaredConstructor(classOf[SparkSession => TiContext], classOf[SparkSession]) | ||
| .newInstance(getOrCreateTiContext, sparkSession) | ||
| .asInstanceOf[Rule[LogicalPlan]] | ||
| } | ||
|
|
||
| def newTiParser( | ||
| getOrCreateTiContext: SparkSession => TiContext, | ||
| sparkSession: SparkSession, | ||
| parserInterface: ParserInterface): ParserInterface = { | ||
| classLoader | ||
| .loadClass(TI_PARSER_CLASS) | ||
| .getDeclaredConstructor( | ||
| classOf[SparkSession => TiContext], | ||
| classOf[SparkSession], | ||
| classOf[ParserInterface]) | ||
| .newInstance(getOrCreateTiContext, sparkSession, parserInterface) | ||
| .asInstanceOf[ParserInterface] | ||
| } | ||
|
|
||
| def newTiDDLRule( | ||
| getOrCreateTiContext: SparkSession => TiContext, | ||
| sparkSession: SparkSession): Rule[LogicalPlan] = { | ||
| classLoader | ||
| .loadClass(TI_DDL_RULE_CLASS) | ||
| .getDeclaredConstructor(classOf[SparkSession => TiContext], classOf[SparkSession]) | ||
| .newInstance(getOrCreateTiContext, sparkSession) | ||
| .asInstanceOf[Rule[LogicalPlan]] | ||
| } | ||
| } |
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