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.direct;
  
  import org.apache.beam.sdk.values.WindowedValue;
  
  /**
   * An evaluator of a specific application of a transform. Will be used for at least one {@link
   * CommittedBundle}.
   *
   * @param <InputT> the type of elements that will be passed to {@link #processElement}
   */
  interface TransformEvaluator<InputT> {
    /**
     * Process an element in the input {@link CommittedBundle}.
     *
     * @param element the element to process
     */
    void processElement(WindowedValue<InputT> element) throws Exception;
  
    /**
     * Finish processing the bundle of this {@link TransformEvaluator}.
     *
     * <p>After {@link #finishBundle()} is called, the {@link TransformEvaluator} will not be reused,
     * and no more elements will be processed.
     *
     * @return an {@link TransformResult} containing the results of this bundle evaluation.
     */
    TransformResult<InputT> finishBundle() throws Exception;
  }
  