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 java.util.ArrayList;
  import java.util.List;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.FinalizeBundleRequest;
  import org.apache.beam.model.fnexecution.v1.BeamFnApi.InstructionRequest;
  
  /** Utility methods for creating {@link BundleFinalizationHandler}s. */
  public class BundleFinalizationHandlers {
  
    /**
     * A bundle finalizer that stores all bundle finalization requests in memory. After the runner
     * durably persists the output, the runner is responsible for invoking {@link
     * InMemoryFinalizer#finalizeAllOutstandingBundles()}.
     */
    public static InMemoryFinalizer inMemoryFinalizer(InstructionRequestHandler fnApiControlClient) {
      return new InMemoryFinalizer(fnApiControlClient);
    }
  
    /** See {@link #inMemoryFinalizer(InstructionRequestHandler)} for details. */
    public static class InMemoryFinalizer implements BundleFinalizationHandler {
      private final InstructionRequestHandler fnApiControlClient;
      private final List<String> bundleIds;
  
      private InMemoryFinalizer(InstructionRequestHandler fnApiControlClient) {
        this.fnApiControlClient = fnApiControlClient;
        this.bundleIds = new ArrayList<>();
      }
  
      /** All finalization requests will be sent without waiting for the responses. */
      public synchronized void finalizeAllOutstandingBundles() {
        for (String bundleId : bundleIds) {
          InstructionRequest request =
              InstructionRequest.newBuilder()
                  .setFinalizeBundle(
                      FinalizeBundleRequest.newBuilder().setInstructionId(bundleId).build())
                  .build();
          fnApiControlClient.handle(request);
        }
        bundleIds.clear();
      }
  
      @Override
      public synchronized void requestsFinalization(String bundleId) {
        bundleIds.add(bundleId);
      }
    }
  }
  