content: /*
   * 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.beam.runners.dataflow.worker;
  
  import com.google.api.services.dataflow.model.CounterUpdate;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.runners.core.metrics.ExecutionStateTracker;
  import org.apache.beam.runners.dataflow.worker.counters.CounterSet;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.Operation;
  
  /**
   * Class for executing a MapTask via intrinsic Java function invocation in Dataflow.
   *
   * <p>Also known as the "legacy" or "pre-portability" method
   */
  public class IntrinsicMapTaskExecutor extends DataflowMapTaskExecutor {
  
    /**
     * @deprecated subclasses should move to composition instead of inheritance, making this private
     */
    @Deprecated
    protected IntrinsicMapTaskExecutor(
        List<Operation> operations,
        CounterSet counterSet,
        ExecutionStateTracker executionStateTracker) {
      super(operations, counterSet, executionStateTracker);
    }
  
    /**
     * Creates a new MapTaskExecutor.
     *
     * @param operations the operations of the map task, in order of execution
     */
    public static IntrinsicMapTaskExecutor forOperations(
        List<Operation> operations, ExecutionStateTracker executionStateTracker) {
      return new IntrinsicMapTaskExecutor(operations, new CounterSet(), executionStateTracker);
    }
  
    /**
     * Creates a new MapTaskExecutor with a shared set of counters with its creator.
     *
     * @param operations the operations of the map task, in order of execution
     * @param counters a set of system counters associated with operations, which may get extended
     *     during execution
     */
    public static IntrinsicMapTaskExecutor withSharedCounterSet(
        List<Operation> operations,
        CounterSet counters,
        ExecutionStateTracker executionStateTracker) {
      return new IntrinsicMapTaskExecutor(operations, counters, executionStateTracker);
    }
  
    /**
     * {@inheritDoc}
     *
     * @return nothing; pre-portability Dataflow extracts Beam metrics via the execution context.
     */
    @Override
    public Iterable<CounterUpdate> extractMetricUpdates() {
      return Collections.emptyList();
    }
  }
  