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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,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
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  package org.apache.beam.runners.dataflow.worker.windmill.client.grpc.stubs;
  
  import com.google.auth.Credentials;
  import javax.annotation.concurrent.ThreadSafe;
  import org.apache.beam.runners.dataflow.worker.windmill.CloudWindmillMetadataServiceV1Alpha1Grpc;
  import org.apache.beam.runners.dataflow.worker.windmill.CloudWindmillMetadataServiceV1Alpha1Grpc.CloudWindmillMetadataServiceV1Alpha1Stub;
  import org.apache.beam.runners.dataflow.worker.windmill.CloudWindmillServiceV1Alpha1Grpc;
  import org.apache.beam.runners.dataflow.worker.windmill.CloudWindmillServiceV1Alpha1Grpc.CloudWindmillServiceV1Alpha1Stub;
  import org.apache.beam.runners.dataflow.worker.windmill.WindmillServiceAddress;
  import org.apache.beam.runners.dataflow.worker.windmill.client.grpc.auth.VendoredCredentialsAdapter;
  import org.apache.beam.sdk.annotations.Internal;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.auth.MoreCallCredentials;
  
  /** Creates remote stubs to talk to Streaming Engine. */
  @Internal
  @ThreadSafe
  public final class ChannelCachingRemoteStubFactory implements ChannelCachingStubFactory {
    private final Credentials gcpCredentials;
    private final ChannelCache channelCache;
  
    private ChannelCachingRemoteStubFactory(Credentials gcpCredentials, ChannelCache channelCache) {
      this.gcpCredentials = gcpCredentials;
      this.channelCache = channelCache;
    }
  
    public static ChannelCachingRemoteStubFactory create(
        Credentials gcpCredentials, ChannelCache channelCache) {
      return new ChannelCachingRemoteStubFactory(gcpCredentials, channelCache);
    }
  
    @Override
    public CloudWindmillServiceV1Alpha1Stub createWindmillServiceStub(
        WindmillServiceAddress serviceAddress) {
      CloudWindmillServiceV1Alpha1Stub windmillServiceStub =
          CloudWindmillServiceV1Alpha1Grpc.newStub(channelCache.get(serviceAddress));
      return serviceAddress.getKind() != WindmillServiceAddress.Kind.AUTHENTICATED_GCP_SERVICE_ADDRESS
          ? windmillServiceStub.withCallCredentials(
              MoreCallCredentials.from(new VendoredCredentialsAdapter(gcpCredentials)))
          : windmillServiceStub;
    }
  
    @Override
    public CloudWindmillMetadataServiceV1Alpha1Stub createWindmillMetadataServiceStub(
        WindmillServiceAddress serviceAddress) {
      return CloudWindmillMetadataServiceV1Alpha1Grpc.newStub(channelCache.get(serviceAddress))
          .withCallCredentials(
              MoreCallCredentials.from(new VendoredCredentialsAdapter(gcpCredentials)));
    }
  
    @Override
    public void remove(WindmillServiceAddress windmillServiceAddress) {
      channelCache.remove(windmillServiceAddress);
    }
  
    @Override
    public void shutdown() {
      channelCache.clear();
    }
  }
  