token_refresh_scheduler.h

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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 limitations
 * under the License.
 */
 
#pragma once
 
#include <chrono>
#include <condition_variable>
#include <cstdint>
#include <functional>
#include <mutex>
#include <thread>
#include <vector>
 
#include "iceberg/catalog/rest/iceberg_rest_export.h"
 
 
namespace iceberg::rest::auth {
 
class ICEBERG_REST_EXPORT TokenRefreshScheduler {
 public:
  static TokenRefreshScheduler& Instance();
 
  uint64_t Schedule(std::chrono::milliseconds delay, std::function<void()> callback);
 
  void Cancel(uint64_t handle);
 
  void Shutdown();
 
  ~TokenRefreshScheduler();
 
  // Non-copyable, non-movable
  TokenRefreshScheduler(const TokenRefreshScheduler&) = delete;
  TokenRefreshScheduler& operator=(const TokenRefreshScheduler&) = delete;
  TokenRefreshScheduler(TokenRefreshScheduler&&) = delete;
  TokenRefreshScheduler& operator=(TokenRefreshScheduler&&) = delete;
 
  TokenRefreshScheduler();
 
 private:
  void Run();
 
  struct Task {
    uint64_t id;
    std::chrono::steady_clock::time_point fire_at;
    std::function<void()> callback;
  };
 
  std::mutex mutex_;
  std::condition_variable cv_;
  std::vector<Task> tasks_;
  uint64_t next_id_ = 1;  // 0 is reserved as "invalid handle"
  bool shutdown_ = false;
  std::thread worker_;
};
 
}  // namespace iceberg::rest::auth