Question

I have already one thread that has to do following work:

public class DetectionHandler extends TimerTask {

@Override
public void run() {
bluetoothAddresses = BluetoothModule.scanAddresses();
wiFiAddresses = WiFiModule.scanAddresses();
...//when scanning is finished, continue work
}

I would like that scanning to be parallel. So I assume that I have to call that two methods asynchronously. And when that scanning is finished, then I can continue work in DetectionHandler class.

I’ve tried the way that BluetoothModule and WiFiModule implements Runnable but had no luck. Tnx

Answer 1

Using ExecutorService you can write something like this:

ArrayList<Callable<Collection<Address>>> tasks = new ArrayList<Callable<Collection<Address>>>();
tasks.add(new Callable<Collection<Address>>() {
  public Collection<Address> call() throws Exception {
    return BluetoothModule.scanAddresses();
  }
});
tasks.add(new Callable<Collection<Address>>() {
  public Collection<Address> call() throws Exception {
    return WiFiModule.scanAddresses();
  }
});

ExecutorService executorService = Executors.newFixedThreadPool(2);
List<Future<Collection<Address>>> futures = executorService.invokeAll(tasks);