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   * 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,
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  package org.apache.beam.runners.dataflow.worker.windmill.testing;
  
  import java.util.function.Supplier;
  import org.apache.beam.runners.dataflow.worker.windmill.CloudWindmillMetadataServiceV1Alpha1Grpc;
  import org.apache.beam.runners.dataflow.worker.windmill.CloudWindmillServiceV1Alpha1Grpc;
  import org.apache.beam.runners.dataflow.worker.windmill.WindmillServiceAddress;
  import org.apache.beam.runners.dataflow.worker.windmill.client.grpc.stubs.ChannelCache;
  import org.apache.beam.runners.dataflow.worker.windmill.client.grpc.stubs.ChannelCachingStubFactory;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.ManagedChannel;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.annotations.VisibleForTesting;
  
  @VisibleForTesting
  public final class FakeWindmillStubFactory implements ChannelCachingStubFactory {
    private final ChannelCache channelCache;
  
    public FakeWindmillStubFactory(Supplier<ManagedChannel> channelFactory) {
      this.channelCache =
          ChannelCache.forTesting(
              (ignoredFlowControlSettings, ignoredServiceAddress) -> channelFactory.get(), () -> {});
    }
  
    @Override
    public CloudWindmillServiceV1Alpha1Grpc.CloudWindmillServiceV1Alpha1Stub
        createWindmillServiceStub(WindmillServiceAddress serviceAddress) {
      return CloudWindmillServiceV1Alpha1Grpc.newStub(channelCache.get(serviceAddress));
    }
  
    @Override
    public CloudWindmillMetadataServiceV1Alpha1Grpc.CloudWindmillMetadataServiceV1Alpha1Stub
        createWindmillMetadataServiceStub(WindmillServiceAddress serviceAddress) {
      return CloudWindmillMetadataServiceV1Alpha1Grpc.newStub(channelCache.get(serviceAddress));
    }
  
    @Override
    public void remove(WindmillServiceAddress windmillServiceAddress) {
      channelCache.remove(windmillServiceAddress);
    }
  
    @Override
    public void shutdown() {
      channelCache.clear();
    }
  }
  