org.apache.flink.table.runtime.FlatMapRunner.scala Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of flink-table-planner_2.11 Show documentation

This module bridges Table/SQL API and runtime. It contains all resources that are required during pre-flight and runtime phase.

The newest version!

/*
 * 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.runtime

import org.apache.flink.api.common.functions.util.FunctionUtils
import org.apache.flink.api.common.functions.{FlatMapFunction, RichFlatMapFunction}
import org.apache.flink.api.common.typeinfo.TypeInformation
import org.apache.flink.api.java.typeutils.ResultTypeQueryable
import org.apache.flink.configuration.Configuration
import org.apache.flink.table.codegen.Compiler
import org.apache.flink.table.util.Logging
import org.apache.flink.types.Row
import org.apache.flink.util.Collector

class FlatMapRunner(
    name: String,
    code: String,
    @transient var returnType: TypeInformation[Row])
  extends RichFlatMapFunction[Row, Row]
  with ResultTypeQueryable[Row]
  with Compiler[FlatMapFunction[Row, Row]]
  with Logging {

  private var function: FlatMapFunction[Row, Row] = _

  override def open(parameters: Configuration): Unit = {
    LOG.debug(s"Compiling FlatMapFunction: $name \n\n Code:\n$code")
    val clazz = compile(getRuntimeContext.getUserCodeClassLoader, name, code)
    LOG.debug("Instantiating FlatMapFunction.")
    function = clazz.newInstance()
    FunctionUtils.setFunctionRuntimeContext(function, getRuntimeContext)
    FunctionUtils.openFunction(function, parameters)
  }

  override def flatMap(in: Row, out: Collector[Row]): Unit =
    function.flatMap(in, out)

  override def getProducedType: TypeInformation[Row] = returnType

  override def close(): Unit = {
    FunctionUtils.closeFunction(function)
  }
}