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.util.common.worker;
  
  import java.io.Closeable;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting;
  
  /** A ParDo mapping function. */
  public class ParDoOperation extends ReceivingOperation {
    private final ParDoFn fn;
  
    public ParDoOperation(ParDoFn fn, OutputReceiver[] outputReceivers, OperationContext context) {
      super(outputReceivers, context);
      this.fn = fn;
    }
  
    @Override
    public void start() throws Exception {
      try (Closeable scope = context.enterStart()) {
        super.start();
        fn.startBundle(receivers);
      }
    }
  
    @Override
    public void process(Object elem) throws Exception {
      try (Closeable scope = context.enterProcess()) {
        checkStarted();
        fn.processElement(elem);
      }
    }
  
    @Override
    public void finish() throws Exception {
      try (Closeable scope = context.enterProcessTimers()) {
        checkStarted();
        fn.processTimers();
      }
  
      try (Closeable scope = context.enterFinish()) {
        fn.finishBundle();
        super.finish();
      }
    }
  
    @Override
    public void abort() throws Exception {
      try (Closeable scope = context.enterAbort()) {
        fn.abort();
        super.abort();
      }
    }
  
    @Override
    public boolean supportsRestart() {
      return true;
    }
  
    @VisibleForTesting
    public ParDoFn getFn() throws Exception {
      return fn;
    }
  }
  