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
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   */
  package org.apache.beam.runners.dataflow.worker.windmill.client.grpc.stubs;
  
  import org.apache.beam.runners.dataflow.worker.windmill.WindmillServiceAddress;
  import org.apache.beam.vendor.grpc.v1p69p0.io.grpc.Channel;
  
  public interface ChannelCachingStubFactory extends WindmillStubFactory {
  
    /**
     * Remove and close the gRPC channel used to communicate with the given {@link
     * WindmillServiceAddress}.
     *
     * <p>Subsequent calls to {@link
     * WindmillStubFactory#createWindmillServiceStub(WindmillServiceAddress)} will get a stub backed
     * by a new {@link Channel} instance to the {@link WindmillServiceAddress}. Users of stubs backed
     * by the previously vended {@link Channel} will start to receive errors.
     */
    void remove(WindmillServiceAddress windmillServiceAddress);
  
    /** Shuts down all channels and stubs. */
    void shutdown();
  }
  