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.sdk.runners;
  
  import com.google.auto.service.AutoService;
  import java.util.ServiceLoader;
  import org.apache.beam.sdk.PipelineRunner;
  import org.apache.beam.sdk.annotations.Internal;
  
  /**
   * <b><i>For internal use only; no backwards-compatibility guarantees.</i></b>
   *
   * <p>{@link PipelineRunner} creators have the ability to automatically have their {@link
   * PipelineRunner} registered with this SDK by creating a {@link ServiceLoader} entry and a concrete
   * implementation of this interface.
   *
   * <p>Note that automatic registration of any {@link org.apache.beam.sdk.options.PipelineOptions}
   * requires users conform to the limit that each {@link PipelineRunner}'s {@link
   * Class#getSimpleName() simple name} must be unique.
   *
   * <p>It is optional but recommended to use one of the many build time tools such as {@link
   * AutoService} to generate the necessary META-INF files automatically.
   */
  @Internal
  public interface PipelineRunnerRegistrar {
    /** Get the set of {@link PipelineRunner PipelineRunners} to register. */
    Iterable<Class<? extends PipelineRunner<?>>> getPipelineRunners();
  }
  