org.apache.flink.table.runtime.match.PatternFlatSelectFunctionRunner.scala Maven / Gradle / Ivy

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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.
 */

package org.apache.flink.table.runtime.`match`

import java.util

import org.apache.flink.api.common.functions.util.FunctionUtils
import org.apache.flink.cep.{PatternFlatSelectFunction, RichPatternFlatSelectFunction}
import org.apache.flink.configuration.Configuration
import org.apache.flink.table.codegen.{GeneratedClass, GeneratedPatternFlatSelectFunction}
import org.apache.flink.table.dataformat.BaseRow
import org.apache.flink.table.runtime.collector.HeaderCollector
import org.apache.flink.table.util.Logging
import org.apache.flink.util.Collector

/**
  * PatternFlatSelectFunctionRunner with [[BaseRow]] input and [[BaseRow]] output.
  */
class PatternFlatSelectFunctionRunner(
    genFunction: GeneratedClass[_])
  extends RichPatternFlatSelectFunction[BaseRow, BaseRow]
  with Logging{

  @transient private var baseRowCollector: HeaderCollector[BaseRow] = _
  @transient private var function: PatternFlatSelectFunction[BaseRow, BaseRow] = _

  override def open(parameters: Configuration): Unit = {
    LOG.debug(s"Compiling PatternFlatSelectFunction: ${genFunction.name} \n\n " +
                s"Code:\n${genFunction.code}")
    function = genFunction.asInstanceOf[GeneratedPatternFlatSelectFunction]
      .newInstance(Thread.currentThread().getContextClassLoader)
    FunctionUtils.setFunctionRuntimeContext(function, getRuntimeContext)
    FunctionUtils.openFunction(function, parameters)

    baseRowCollector = new HeaderCollector()
    baseRowCollector.setAccumulate()
  }

  override def flatSelect(
      pattern: util.Map[String, util.List[BaseRow]],
      out: Collector[BaseRow]): Unit = {
    baseRowCollector.out = out
    function.flatSelect(pattern, baseRowCollector)
  }

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