text: /*
   * Copyright 2019-present Facebook, Inc.
   *
   * 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.
   */
  
  #ifndef _THRIFT_CONCURRENCY_TIMERMANAGER_H_
  #define _THRIFT_CONCURRENCY_TIMERMANAGER_H_ 1
  
  #include <atomic>
  #include <ctime>
  #include <map>
  #include <memory>
  
  #include <thrift/lib/cpp/concurrency/Exception.h>
  #include <thrift/lib/cpp/concurrency/Monitor.h>
  #include <thrift/lib/cpp/concurrency/Thread.h>
  
  namespace apache { namespace thrift { namespace concurrency {
  
  /**
   * Timer Manager
   *
   * This class dispatches timer tasks when they fall due.
   *
   * @version $Id:$
   */
  class TimerManager {
  
   public:
  
    TimerManager();
  
    virtual ~TimerManager();
  
    virtual std::shared_ptr<const ThreadFactory> threadFactory() const;
  
    virtual void threadFactory(std::shared_ptr<const ThreadFactory> value);
  
    /**
     * Starts the timer manager service
     *
     * @throws IllegalArgumentException Missing thread factory attribute
     */
    virtual void start();
  
    /**
     * Stops the timer manager service
     */
    virtual void stop();
  
    virtual size_t taskCount() const ;
  
    /**
     * Adds a task to be executed at some time in the future by a worker thread.
     *
     * @param task The task to execute
     * @param timeout Time in milliseconds to delay before executing task
     */
    virtual void add(std::shared_ptr<Runnable> task, int64_t timeout);
  
    /**
     * Adds a task to be executed at some time in the future by a worker thread.
     *
     * @param task The task to execute
     * @param timeout Absolute time in the future to execute task.
     */
    virtual void add(std::shared_ptr<Runnable> task, const struct timespec& timeout);
  
    /**
     * Removes a pending task
     *
     * @throws NoSuchTaskException Specified task doesn't exist. It was either
     *                             processed already or this call was made for a
     *                             task that was never added to this timer
     *
     * @throws UncancellableTaskException Specified task is already being
     *                                    executed or has completed execution.
     */
    virtual void remove(std::shared_ptr<Runnable> task);
  
    enum STATE {
      UNINITIALIZED,
      STARTING,
      STARTED,
      STOPPING,
      STOPPED
    };
  
    virtual STATE state() const;
  
   private:
    std::shared_ptr<const ThreadFactory> threadFactory_;
    class Task;
    friend class Task;
    std::multimap<int64_t, std::shared_ptr<Task> > taskMap_;
    std::atomic<size_t> taskCount_;
    Monitor monitor_;
    STATE state_;
    class Dispatcher;
    friend class Dispatcher;
    std::shared_ptr<Dispatcher> dispatcher_;
    std::shared_ptr<Thread> dispatcherThread_;
    typedef std::multimap<int64_t, std::shared_ptr<TimerManager::Task> >::iterator task_iterator;
    typedef std::pair<task_iterator, task_iterator> task_range;
  };
  
  }}} // apache::thrift::concurrency
  
  #endif // #ifndef _THRIFT_CONCURRENCY_TIMERMANAGER_H_
  