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.ProcessBundleSplitResponse;
  
  /**
   * A handler which is invoked whenever an active bundle is split. The active bundle will continue to
   * keep processing until it is complete.
   *
   * <p>The returned split response contains a description of work that has been performed containing
   * a {@code primary} portion that the SDK is responsible for processing and a {@code residual} which
   * the runner is responsible for scheduling for future processing. See <a
   * href="https://s.apache.org/beam-breaking-fusion">breaking the fusion barrier</a> for further
   * details.
   */
  public interface BundleSplitHandler {
    void split(ProcessBundleSplitResponse splitResponse);
  
    /** Returns a bundle split handler that throws on any split response. */
    static BundleSplitHandler unsupported() {
      return new BundleSplitHandler() {
        @Override
        public void split(ProcessBundleSplitResponse splitResponse) {
          throw new UnsupportedOperationException(
              String.format(
                  "%s does not support splitting.", BundleSplitHandler.class.getSimpleName()));
        }
      };
    };
  }
  