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;
  
  /** Middleware that's used to extract and pass headers to the server during requests. */
  public class ServerHeaderMiddleware implements FlightServerMiddleware {
    /** Factory for accessing ServerHeaderMiddleware. */
    public static class Factory implements FlightServerMiddleware.Factory<ServerHeaderMiddleware> {
      /** Construct a factory for receiving call headers. */
      public Factory() {}
  
      @Override
      public ServerHeaderMiddleware onCallStarted(
          CallInfo callInfo, CallHeaders incomingHeaders, RequestContext context) {
        return new ServerHeaderMiddleware(incomingHeaders);
      }
    }
  
    private final CallHeaders headers;
  
    private ServerHeaderMiddleware(CallHeaders incomingHeaders) {
      this.headers = incomingHeaders;
    }
  
    /** Retrieve the headers for this call. */
    public CallHeaders headers() {
      return headers;
    }
  
    @Override
    public void onBeforeSendingHeaders(CallHeaders outgoingHeaders) {}
  
    @Override
    public void onCallCompleted(CallStatus status) {}
  
    @Override
    public void onCallErrored(Throwable err) {}
  }
  