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.transforms.PTransform;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Instant;
  
  /**
   * Part of a {@link PCollection}. Elements are output to a bundle, which will cause them to be
   * executed by {@link PTransform PTransforms} that consume the {@link PCollection} this bundle is a
   * part of at a later point. This is an uncommitted bundle and can have elements added to it.
   *
   * @param <T> the type of elements that can be added to this bundle
   */
  interface UncommittedBundle<T> {
    /** Returns the PCollection that the elements of this {@link UncommittedBundle} belong to. */
    @Nullable
    PCollection<T> getPCollection();
  
    /**
     * Outputs an element to this bundle.
     *
     * @param element the element to add to this bundle
     * @return this bundle
     */
    UncommittedBundle<T> add(WindowedValue<T> element);
  
    /**
     * Commits this {@link UncommittedBundle}, returning an immutable {@link CommittedBundle}
     * containing all of the elements that were added to it. The {@link #add(WindowedValue)} method
     * will throw an {@link IllegalStateException} if called after a call to commit.
     *
     * @param synchronizedProcessingTime the synchronized processing time at which this bundle was
     *     committed
     */
    CommittedBundle<T> commit(Instant synchronizedProcessingTime);
  }
  