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.samza;
  
  import org.apache.samza.config.Config;
  import org.apache.samza.context.ExternalContext;
  
  /** Life cycle listener for a Samza pipeline during runtime. */
  public interface SamzaPipelineLifeCycleListener {
    /** Callback when the pipeline options is created. */
    void onInit(Config config, SamzaPipelineOptions options);
  
    /** Callback when the pipeline is started. */
    ExternalContext onStart();
  
    /**
     * Callback after the pipeline is submmitted. This will be invoked only for Samza jobs submitted
     * to a cluster.
     */
    void onSubmit();
  
    /** Callback after the pipeline is finished. */
    void onFinish();
  
    /** A registrar for {@link SamzaPipelineLifeCycleListener}. */
    interface Registrar {
      SamzaPipelineLifeCycleListener getLifeCycleListener();
    }
  }
  