Обработчик публикует очередь выполнения не в правильном порядке

Question

Я работаю над приложением для Android, которое имеет связь с устройством Bluetooth BLE (с пользовательским протоколом, который был разработан специально для нашего продукта).

после подключения к устройству у меня появляется обратный вызов public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic), который получаетсрабатывает каждый раз, когда устройство хочет отправить мне данные.В архитектуре приложения есть действия (например, getDeviceStatus()), протокол работает следующим образом: телефон подключается к устройству -> сделать рукопожатие -> отправить команду (в виде байта) -> устройство отвечает командой (нормально / не хорошо) -> И теперь устройство начинает отправлять куски X byte[].Поэтому, чтобы убедиться, что мы обрабатываем данные в правильном порядке и не получаем путаницу из-за разных потоков, я добавил HandlerThread:

HandlerThread handlerThread = new HandlerThread("ActionHandlerThread");
      handlerThread.start();
      Looper looper = handlerThread.getLooper();
      mHandler = new Handler(looper);

и каждый раз, когда устройство отправляет данные, я звоню

@Override
 public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
    mHandler.post(() -> {
        mListener.onCharacteristicChanged(gatt, characteristic);
        }
    );  
 }

и mListener отправляют данные другому классу, который проверяет, какие данные поступили и какие данные ожидаются.Если я правильно понимаю, что каждый раз, когда я вызываю post (), новая задача добавляется в петлитель обработчика и должна обрабатывать задачу в том же порядке, в котором я их добавил, но когда я запускаю приложение в журналах, я вижу, что обратный вызов срабатывает правильно и отправляет сообщение () вызывается в правильном порядке, но позже обработка происходит в неправильном порядке.Например, приложение ожидает получения команды подтверждения, но вместо этого данные уже пришли, но это невозможно, поскольку данные не могут быть получены до подтверждения.Основная причина, по которой я создаю HandlerThread, - убедиться, что вся операция с BLE будет выполняться в одном потоке, и не беспокоиться о проблемах синхронизации, но теперь, похоже, у меня проблемы с синхронизацией.Мне не хватает какой-то логики или понимания работы HandlerThread.

Некоторые тесты, которые я проводил с использованием только таймера и счетчика, мы видим, что, когда интервалы составляют всего 1 мс, не все задачи печатаются внутри сообщения:

Интервал 5 мс:

2019-01-30 21:33:31.531 27991-27991/? D/ThreadTest: Thread before Thread[main,5,main]
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Интервал 1 мс:

2019-01-30 21:32:57.104 27831-27831/? D/ThreadTest: Thread before Thread[main,5,main]
2019-01-30 21:32:57.105 27831-27866/? D/ThreadTest: Counter : 1 , Thread[Timer-0,5,main]
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2019-01-30 21:32:57.150 27831-27866/? D/ThreadTest: Counter : 37 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.150 27831-27866/? D/ThreadTest: Counter : 38 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.150 27831-27865/? D/ThreadTest: Counter : 38 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.150 27831-27865/? D/ThreadTest: Counter : 38 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.151 27831-27866/? D/ThreadTest: Counter : 39 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.151 27831-27865/? D/ThreadTest: Counter : 39 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.152 27831-27866/? D/ThreadTest: Counter : 40 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.152 27831-27865/? D/ThreadTest: Counter : 40 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.153 27831-27866/? D/ThreadTest: Counter : 41 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.154 27831-27866/? D/ThreadTest: Counter : 42 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.154 27831-27865/? D/ThreadTest: Counter : 42 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.154 27831-27865/? D/ThreadTest: Counter : 42 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.155 27831-27866/? D/ThreadTest: Counter : 43 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.155 27831-27865/? D/ThreadTest: Counter : 43 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.156 27831-27866/? D/ThreadTest: Counter : 44 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.156 27831-27865/? D/ThreadTest: Counter : 44 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.157 27831-27866/? D/ThreadTest: Counter : 45 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.158 27831-27865/? D/ThreadTest: Counter : 45 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.159 27831-27866/? D/ThreadTest: Counter : 46 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.159 27831-27865/? D/ThreadTest: Counter : 46 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.160 27831-27866/? D/ThreadTest: Counter : 47 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.160 27831-27865/? D/ThreadTest: Counter : 47 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.161 27831-27866/? D/ThreadTest: Counter : 48 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.161 27831-27865/? D/ThreadTest: Counter : 48 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.163 27831-27866/? D/ThreadTest: Counter : 49 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.163 27831-27866/? D/ThreadTest: Counter : 50 , Thread[Timer-0,5,main]
2019-01-30 21:32:57.163 27831-27865/? D/ThreadTest: Counter : 50 , inside post Thread[MyTestThread,5,main]
2019-01-30 21:32:57.163 27831-27865/? D/ThreadTest: Counter : 50 , inside post Thread[MyTestThread,5,main]

Код для теста:

private fun handlerThreadTest() {
    val handlerThread = HandlerThread("MyTestThread")
    handlerThread.start()

    val handler = Handler(handlerThread.looper)

    Log.d("ThreadTest", "Thread before ${Thread.currentThread()}")
    var i = 0
    val timerObj = Timer()
    val timerTaskObj = object : TimerTask() {
      override fun run() {
        i++
        //perform your action here
        Log.d("ThreadTest", "Counter : $i , ${Thread.currentThread()}")
        handler.post {
          Log.d("ThreadTest", "Counter : $i , inside post ${Thread.currentThread()}")
          if (i == 50)
            timerObj.cancel()
        }
      }
    }

    timerObj.schedule(timerTaskObj, 0, 5)

  }

Answer 1

У вас есть ошибка в вашем коде.Вам необходимо извлечь значение из характеристики, прежде чем публиковать свой Runnable.В противном случае, когда Runnable позднее запустится и извлечет значение, оно будет самым новым.

Web-реализация Bluetooth в Chromium допустила ту же ошибку.См. https://bugs.chromium.org/p/chromium/issues/detail?id=647673&desc=2.

Но также обратите внимание, что в более новых версиях Android вы можете напрямую устанавливать обработчик в connectGatt.