Android_ADB连接管理

最近在配合公司同事搭建移动端测试框架，其中需要维护设备池的连接。考虑到wifi连接的过程中可能存在网络中导致的ADB连接中断，所以做了一个小服务程序来保证设备池中有设备连接断开后，能再第一时间将设备重新连接。

需求：

1. 获取需要维持连接的列表
2. 检测连接状态，尝试连接所有没有连接的设备

实现思路：

1. 子线程不断去检索出需要维持连接的状态信息，放到待连接队列中
2. 另外的子线程去待连接队列中获取需要连接的设备然后尝试连接，并将最终的连接状态更新到数据库表中

技术要点：

1. 多线程

2. 线程池技术:newScheduledThreadPool, scheduleAtFixedRate, scheduleWithFixedDelay

3. 线程并发访问共享资源：LinkedBlockingQueue

项目目录结构

1. 获取待连接设备

public class GetDeviceExecutor implements Runnable {

    private DeviceModelDao mDao;
    private ADB mADB;
    private BlockingQueue mDeviceModels;

    protected GetDeviceExecutor(DeviceModelDao pDao, ADB pADB, BlockingQueue pDeviceModels) {
        if (pDao == null) {
            throw new IllegalArgumentException("DeviceModelDao cannot be null...");
        }
        if (pADB == null) {
            throw new IllegalArgumentException("DeviceModelDao cannot be null...");
        }
        if (pDeviceModels == null) {
            throw new IllegalArgumentException("DeviceModelDao cannot be null...");
        }
        mDao = pDao;
        mADB = pADB;
        mDeviceModels = pDeviceModels;
    }

    @Override
    public void run() {
        List devices = mDao.getDevices();
        List devicesConnectedByWIFI = mADB.getDevicesConnectedByWIFI();

        // 获取需要连接的设备
        devices.removeAll(devicesConnectedByWIFI);
        // 获取需要连接的设备 且 不在当前连接队列中的设备
        devices.removeAll(mDeviceModels);
        // 把需要连接 且 不在当前待连接队列中的设备
        for (DeviceModel device : devices) {
            mDeviceModels.offer(device);
        }
    }
}

2. 连接设备

public class ConnectDeviceExecutor implements Runnable {

    private DeviceModelDao mDao;
    private ADB mADB;
    private BlockingQueue mDeviceModels;

    protected ConnectDeviceExecutor(DeviceModelDao pDao, ADB pADB, BlockingQueue pDeviceModels) {
        mDao = pDao;
        mADB = pADB;
        mDeviceModels = pDeviceModels;
    }

    @Override
    public void run() {
        for (DeviceModel device : mDeviceModels) {
            System.out.println("Connect "+device.getUdid()+" ...");
            int connected = mADB.connectDeviceByIp(device);
            if (connected == 1) {
                try {
                    mDeviceModels.take();
                } catch (InterruptedException pE) {
                    pE.printStackTrace();
                }
            } else {
                System.out.println(device.getUdid() + " connect failed...");
            }

            device.setState(connected);
            mDao.updateDeviceModelState(device);
        }
    }
}

3. 封装到ConnectService类中

public class ConnectService {

    private ADB mADB;
    private DeviceModelDao mDao;

    /**
     * 需要尝试连接的
     */
    private BlockingQueue mDeviceModels;
    private ScheduledExecutorService mExecutor = Executors.newScheduledThreadPool(3);
    private final ConnectDeviceExecutor mConnectDeviceExecutor;
    private final GetDeviceExecutor mGetDeviceExecutor;


    protected ConnectService() {
        mDao = new DeviceModelDao();
        mADB = new ADB(new CommandLine(), new ADBParser());
        mDeviceModels = new LinkedBlockingQueue<>(16);
        mGetDeviceExecutor = new GetDeviceExecutor(mDao, mADB, mDeviceModels);
        mConnectDeviceExecutor = new ConnectDeviceExecutor(mDao, mADB, mDeviceModels);

    }

    public void start() {
        mExecutor.scheduleWithFixedDelay(mGetDeviceExecutor, 0, 3, TimeUnit.SECONDS);
        mExecutor.scheduleAtFixedRate(mConnectDeviceExecutor, 0, 1, TimeUnit.SECONDS);
    }

    public void stop() {
        mExecutor.shutdown();
    }

    public BlockingQueue getDeviceModels() {
        return mDeviceModels;
    }
}