org.apache.flink.table.runtime.match.IterativeConditionRunner.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 org.apache.flink.api.common.functions.util.FunctionUtils
import org.apache.flink.cep.pattern.conditions.{IterativeCondition, RichIterativeCondition}
import org.apache.flink.configuration.Configuration
import org.apache.flink.table.codegen.{GeneratedClass, GeneratedIterativeCondition}
import org.apache.flink.table.dataformat.BaseRow
import org.apache.flink.table.util.Logging

/**
  * IterativeConditionRunner with [[BaseRow]] value.
  */
class IterativeConditionRunner(
    genCondition: GeneratedClass[_])
  extends RichIterativeCondition[BaseRow]
  with Logging {

  @transient private var function: IterativeCondition[BaseRow] = _
  @transient private var isOpened: Boolean = false

  override def open(parameters: Configuration): Unit = {
    if (!isOpened) {
      LOG.debug(
        s"Compiling IterativeCondition: ${genCondition.name} \n\n" +
          s"Code:\n${genCondition.code}")
      LOG.debug("Instantiating IterativeCondition.")
      function = genCondition.asInstanceOf[GeneratedIterativeCondition]
        .newInstance(Thread.currentThread().getContextClassLoader)
      FunctionUtils.setFunctionRuntimeContext(function, getRuntimeContext)
      FunctionUtils.openFunction(function, parameters)

      isOpened = true
    }
  }

  override def filter(value: BaseRow, ctx: IterativeCondition.Context[BaseRow]): Boolean = {
    function.filter(value, ctx)
  }

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