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.arrow.flight.grpc;
  
  import io.grpc.Metadata;
  import io.grpc.ServerCall;
  import io.grpc.ServerCallHandler;
  import io.grpc.ServerInterceptor;
  
  /**
   * An interceptor for specifying the number of bytes that can be queued before a call with an output
   * stream gets blocked by backpressure.
   */
  public class ServerBackpressureThresholdInterceptor implements ServerInterceptor {
  
    private final int numBytes;
  
    public ServerBackpressureThresholdInterceptor(int numBytes) {
      this.numBytes = numBytes;
    }
  
    @Override
    public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(
        ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {
      call.setOnReadyThreshold(numBytes);
      return next.startCall(call, headers);
    }
  }
  