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 static org.junit.Assert.assertFalse;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.NoSuchElementException;
  import java.util.Observable;
  import java.util.Observer;
  import org.apache.beam.runners.dataflow.worker.IntrinsicMapTaskExecutorFactory.ElementByteSizeObservableCoder;
  import org.apache.beam.runners.dataflow.worker.counters.CounterSet;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  
  /** Utilities for tests. */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
    "unchecked",
  })
  public class ExecutorTestUtils {
    // Do not instantiate.
    private ExecutorTestUtils() {}
  
    /** An Operation with a specified number of outputs. */
    public static class TestOperation extends Operation {
      public TestOperation(int numOutputs, OperationContext contexts) {
        this(numOutputs, new CounterSet(), contexts);
      }
  
      TestOperation(int numOutputs, CounterSet counterSet, OperationContext contexts) {
        super(createOutputReceivers(numOutputs, counterSet), contexts);
      }
  
      private static OutputReceiver[] createOutputReceivers(int numOutputs, CounterSet counterSet) {
        OutputReceiver[] receivers = new OutputReceiver[numOutputs];
        for (int i = 0; i < numOutputs; i++) {
          receivers[i] =
              new TestOutputReceiver(
                  "out_" + i, new ElementByteSizeObservableCoder(StringUtf8Coder.of()), counterSet);
        }
        return receivers;
      }
    }
  
    /** A {@code Reader<String>} that yields a specified set of values. */
    public static class TestReader extends NativeReader<String> {
      private final List<String> inputs;
      boolean closed = false;
      boolean aborted = false;
  
      public TestReader(String... inputs) {
        this.inputs = Arrays.asList(inputs);
      }
  
      @Override
      public NativeReaderIterator<String> iterator() {
        return new TestReaderIterator(inputs);
      }
  
      class TestReaderIterator extends NativeReaderIterator<String> {
        private final List<String> inputs;
        private int currentIndex;
  
        public TestReaderIterator(List<String> inputs) {
          this.inputs = ImmutableList.copyOf(inputs);
        }
  
        @Override
        public boolean start() {
          if (inputs.isEmpty()) {
            return false;
          }
          notifyElementRead(getCurrent().length());
          return true;
        }
  
        @Override
        public boolean advance() throws IOException {
          if (currentIndex >= inputs.size() - 1) {
            return false;
          }
          ++currentIndex;
          notifyElementRead(getCurrent().length());
          return true;
        }
  
        @Override
        public String getCurrent() throws NoSuchElementException {
          return inputs.get(currentIndex);
        }
  
        @Override
        public void close() {
          assertFalse(closed);
          closed = true;
        }
  
        @Override
        public void abort() {
          assertFalse(aborted);
          aborted = true;
        }
      }
    }
  
    /**
     * An Observer that stores all sizes into an ArrayList, to compare against the gold standard
     * during testing.
     */
    public static class TestReaderObserver implements Observer {
      private final List<Integer> sizes;
  
      public TestReaderObserver(NativeReader reader) {
        this(reader, new ArrayList<>());
      }
  
      public TestReaderObserver(NativeReader reader, List<Integer> sizes) {
        this.sizes = sizes;
        reader.addObserver(this);
      }
  
      @Override
      public void update(Observable obs, Object obj) {
        sizes.add((int) (long) obj);
      }
  
      public List<Integer> getActualSizes() {
        return sizes;
      }
    }
  
    /** A {@code Sink<String>} that allows the output elements to be retrieved. */
    public static class TestSink extends Sink<String> {
      List<String> outputElems = new ArrayList<>();
      boolean closed = false;
      boolean aborted = false;
  
      @Override
      public SinkWriter<String> writer() {
        return new TestSinkWriter();
      }
  
      class TestSinkWriter implements SinkWriter<String> {
        @Override
        public long add(String outputElem) {
          outputElems.add(outputElem);
          return outputElem.length();
        }
  
        @Override
        public void close() {
          assertFalse(closed);
          closed = true;
        }
  
        @Override
        public void abort() throws IOException {
          close();
        }
      }
    }
  }
  