Android Open Source - MovisensGattSensorExample Ble Queue

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License

The source code is released under:

GNU General Public License

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Java Source Code

package com.movisens.gattsensorexample.utils;
//ww  w  .  j  a  va2s  . c om
import java.util.LinkedList;
import java.util.Queue;

import android.annotation.TargetApi;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.os.Build;
import android.util.Log;

/**
 * Required Queue to serialize GATT commands
 * 
 */
@TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR2)
public class BleQueue {
  enum ActionType {
    writeDescriptor, readCharacteristic, writeCharacteristic
  }

  private Queue<Action> bleQueue = new LinkedList<Action>();
  private BluetoothGatt mBluetoothGatt;

  public BleQueue(BluetoothGatt bluetoothGatt) {
    this.mBluetoothGatt = bluetoothGatt;
  }

  public void writeDescriptor(BluetoothGattDescriptor descriptor) {
    addAction(ActionType.writeDescriptor, descriptor);
  }

  public void onDescriptorWrite(BluetoothGatt gatt,
      BluetoothGattDescriptor descriptor, int status) {
    bleQueue.remove();
    nextAction();
  };

  public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
    addAction(ActionType.readCharacteristic, characteristic);
  }

  public void onCharacteristicRead(BluetoothGatt gatt,
      BluetoothGattCharacteristic characteristic, int status) {
    bleQueue.remove();
    nextAction();
  }

  public void writeCharacteristic(BluetoothGattCharacteristic characteristic) {
    addAction(ActionType.writeCharacteristic, characteristic);
  }

  public void onCharacteristicWrite(BluetoothGatt gatt,
      BluetoothGattCharacteristic characteristic, int status) {
    bleQueue.remove();
    nextAction();
  }

  private void addAction(ActionType actionType, Object object) {
    bleQueue.add(new Action(actionType, object));
    // if there is only 1 item in the queue, then process it. If more than
    // 1,
    // we handle asynchronously in the callback.
    if (bleQueue.size() == 1)
      nextAction();
  }

  private void nextAction() {
    if (bleQueue.isEmpty())
      return;
    Action action = bleQueue.element();
    if (ActionType.writeDescriptor.equals(action.getType())) {
      mBluetoothGatt.writeDescriptor((BluetoothGattDescriptor) action
          .getObject());
    } else if (ActionType.writeCharacteristic.equals(action.getType())) {
      mBluetoothGatt
          .writeCharacteristic((BluetoothGattCharacteristic) action
              .getObject());
    } else if (ActionType.readCharacteristic.equals(action.getType())) {
      mBluetoothGatt
          .readCharacteristic((BluetoothGattCharacteristic) action
              .getObject());
    } else {
      Log.e("BLEQueue", "Undefined Action found");
    }
  }

  public class Action {
    private final ActionType actionType;
    private final Object object;

    public Action(ActionType actionType, Object object) {
      this.actionType = actionType;
      this.object = object;
    }

    public ActionType getType() {
      return this.actionType;
    }

    public Object getObject() {
      return this.object;
    }
  }
}

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