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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,
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package org.apache.kudu.client;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import com.google.protobuf.Message;
import io.netty.util.Timer;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.yetus.audience.InterfaceStability;

import org.apache.kudu.master.Master;
import org.apache.kudu.util.Pair;

/**
 * Ping request only used for tests to test connections.
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
class PingRequest extends KuduRpc {

  private final String serviceName;
  private final List requiredFeatures = new ArrayList<>();

  static PingRequest makeMasterPingRequest() {
    return makeMasterPingRequest(null, null, 0);
  }

  static PingRequest makeMasterPingRequest(KuduTable masterTable, Timer timer, long timeoutMillis) {
    return new PingRequest(masterTable, MASTER_SERVICE_NAME, timer, timeoutMillis);
  }

  static PingRequest makeTabletServerPingRequest() {
    return new PingRequest(TABLET_SERVER_SERVICE_NAME, null, 0);
  }

  private PingRequest(String serviceName, Timer timer, long timeoutMillis) {
    this(null, serviceName, timer, timeoutMillis);
  }

  private PingRequest(KuduTable table, String serviceName, Timer timer, long timeoutMillis) {
    super(table, timer, timeoutMillis);
    this.serviceName = serviceName;
  }

  /**
   * Add an application-specific feature flag required to service the RPC.
   * This can be useful on the Ping request to check if a service supports a feature.
   * The server will respond with an RpcRemoteException if a feature is not supported.
   */
  void addRequiredFeature(Integer feature) {
    requiredFeatures.add(feature);
  }

  @Override
  Collection getRequiredFeatures() {
    return requiredFeatures;
  }

  @Override
  Message createRequestPB() {
    return Master.PingRequestPB.getDefaultInstance();
  }

  @Override
  String serviceName() {
    return serviceName;
  }

  @Override
  String method() {
    return "Ping";
  }

  @Override
  Pair deserialize(CallResponse callResponse, String tsUUID)
      throws KuduException {
    final Master.PingResponsePB.Builder respBuilder =
        Master.PingResponsePB.newBuilder();
    readProtobuf(callResponse.getPBMessage(), respBuilder);
    PingResponse response = new PingResponse(timeoutTracker.getElapsedMillis(), tsUUID);
    return new Pair<>(response, null);
  }
}




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