Compile.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.flink.table.expressions.utils

import org.apache.flink.api.common.functions.{Function, MapFunction}
import org.apache.flink.table.api.{TableConfig, Types}
import org.apache.flink.table.codegen.{CodeGenerator, Compiler, GeneratedFunction}
import org.apache.flink.util.InstantiationUtil

object CompileTest {

  // TestCompiler that uses current class loader
  class TestCompiler2[F <: Function, T <: Any] extends Compiler[F] {
    def compile(genFunc: GeneratedFunction[F, T]): Class[F] =
      compile(getClass.getClassLoader, genFunc.name, genFunc.code)
  }

  def main(args: Array[String]): Unit = {
    val compiler = new TestCompiler2[MapFunction[String, String], String]()
    val generator = new CodeGenerator(new TableConfig, false, Types.STRING)
    val cody =
      s"""
         |String res = ${generator.input1Term} + " world!";
         |return res;
      """.stripMargin
    val genFunc = generator.generateFunction[MapFunction[String, String], String](
      "TestFunction",
      classOf[MapFunction[String, String]],
      cody,
      Types.STRING)
    val clazz = compiler.compile(genFunc)


    val obj2 = clazz.newInstance()
    val janinoCL = obj2.getClass.getClassLoader

    // print: TestFunction$0
    println(obj2.getClass.getCanonicalName)
    // print: org.codehaus.janino.ByteArrayClassLoader@341b80b2
    println(janinoCL)


    val bytes = InstantiationUtil.serializeObject(obj2)
    val map: MapFunction[String, String] = InstantiationUtil.deserializeObject(bytes, janinoCL)
    
    // print: hello world!
    println(map.map("hello"))
  }


}