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.jet.processors;
  
  import com.hazelcast.function.SupplierEx;
  import com.hazelcast.jet.core.AbstractProcessor;
  import com.hazelcast.jet.core.Processor;
  import com.hazelcast.jet.core.ResettableSingletonTraverser;
  import java.util.Collection;
  import javax.annotation.Nonnull;
  import org.apache.beam.runners.jet.Utils;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.transforms.windowing.WindowFn;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.beam.sdk.values.WindowingStrategy;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Iterables;
  import org.joda.time.Instant;
  
  /**
   * /** * Jet {@link com.hazelcast.jet.core.Processor} implementation for Beam's Windowing primitive.
   *
   * @param <T> type of element being windowed
   */
  @SuppressWarnings({
    "rawtypes", // TODO(https://github.com/apache/beam/issues/20447)
    "nullness",
    "keyfor"
  }) // TODO(https://github.com/apache/beam/issues/20497)
  public class AssignWindowP<T> extends AbstractProcessor {
  
    @SuppressWarnings({"FieldCanBeLocal", "unused"})
    private final String ownerId; // do not remove, useful for debugging
  
    private final ResettableSingletonTraverser<byte[]> traverser =
        new ResettableSingletonTraverser<>();
    private final FlatMapper<byte[], byte[]> flatMapper;
    private final WindowAssignContext<T> windowAssignContext;
  
    private AssignWindowP(
        Coder inputCoder,
        Coder outputCoder,
        WindowingStrategy<T, BoundedWindow> windowingStrategy,
        String ownerId) {
      this.ownerId = ownerId;
  
      windowAssignContext = new WindowAssignContext<>(windowingStrategy.getWindowFn());
  
      flatMapper =
          flatMapper(
              item -> {
                Collection<BoundedWindow> windows;
                WindowedValue<T> inputValue = Utils.decodeWindowedValue(item, inputCoder);
                windowAssignContext.setValue(inputValue);
                try {
                  windows = windowingStrategy.getWindowFn().assignWindows(windowAssignContext);
                } catch (Exception e) {
                  throw new RuntimeException(e);
                }
                WindowedValue<T> outputValue =
                    WindowedValues.of(
                        inputValue.getValue(),
                        inputValue.getTimestamp(),
                        windows,
                        inputValue.getPaneInfo());
                traverser.accept(Utils.encode(outputValue, outputCoder));
                return traverser;
              });
    }
  
    public static <T> SupplierEx<Processor> supplier(
        Coder inputCoder,
        Coder outputCoder,
        WindowingStrategy<T, BoundedWindow> windowingStrategy,
        String ownerId) {
      return () -> new AssignWindowP<>(inputCoder, outputCoder, windowingStrategy, ownerId);
    }
  
    @SuppressWarnings("unchecked")
    @Override
    protected boolean tryProcess(int ordinal, @Nonnull Object item) {
      return flatMapper.tryProcess((byte[]) item);
    }
  
    private static class WindowAssignContext<InputT>
        extends WindowFn<InputT, BoundedWindow>.AssignContext {
      private WindowedValue<InputT> value;
  
      WindowAssignContext(WindowFn<InputT, BoundedWindow> fn) {
        fn.super();
      }
  
      public void setValue(WindowedValue<InputT> value) {
        if (Iterables.size(value.getWindows()) != 1) {
          throw new IllegalArgumentException(
              String.format(
                  "%s passed to window assignment must be in a single window, but it was in %s: %s",
                  WindowedValues.class.getSimpleName(),
                  Iterables.size(value.getWindows()),
                  value.getWindows()));
        }
        this.value = value;
      }
  
      @Override
      public InputT element() {
        return value.getValue();
      }
  
      @Override
      public Instant timestamp() {
        return value.getTimestamp();
      }
  
      @Override
      public BoundedWindow window() {
        return Iterables.getOnlyElement(value.getWindows());
      }
    }
  }
  