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.fnexecution.control;
  
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleProgressResponse;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.ProcessBundleResponse;
  
  /**
   * A handler for bundle progress messages, both during bundle execution and on its completion.
   *
   * <p>Methods on this interface will only be called serially, and after {@link #onCompleted} no more
   * calls will be made.
   */
  public interface BundleProgressHandler {
    /** Handles a progress report from the bundle while it is executing. */
    void onProgress(ProcessBundleProgressResponse progress);
  
    /** Handles the bundle's completion report. */
    void onCompleted(ProcessBundleResponse response);
  
    /** Returns a handler that ignores metrics. */
    static BundleProgressHandler ignored() {
      return new BundleProgressHandler() {
        @Override
        public void onProgress(ProcessBundleProgressResponse progress) {}
  
        @Override
        public void onCompleted(ProcessBundleResponse response) {}
      };
    }
  }
  