[guardian-dev] Fwd: libaccesspoint concurrency help

[Daniel Martí]

This looks promising, thank you Michael! Will test it out :)

On Tue, May 12, 2015 at 20:45:47 +0100, Michael Rogers wrote:
> You could use a CountDownLatch to manage the counter, but I'd probably
> do something like this instead:
> 
> public void getReachableClients(final ReachableClientListener listener,
>         final int timeout) {
>     List<Client> clients = getClients();
>     if(clients == null) return;
>     Executor executor = Executors.newCachedThreadPool();
>     for(final Client c : clients) {
>         executor.submit(new Runnable() {
>             public void run() {
>                 try {
>                     InetAddress ip = InetAddress.getByName(c.IPAddr);
>                     if(ip.isReachable(timeout))
>                         listener.onReachableClient(c);
>                 } catch(IOException e) {
>                     Log.e(TAG, "", e);
>                 }
>             }
>         });
>     }
> }
> 
> This will return the results to the listener on background threads. If
> you want them returned on the UI thread, do this:
> 
> if(ip.isReachable(timeout)) {
>     runOnUiThread(new Runnable() {
>         public void run() {
>             listener.onReachableClient(c);
>         }
>     });
> }
> 
> Incidentally, the phrase to google for is "java concurrency in
> practice". I'm not a big collector of programming books by any means,
> but that one is really worthwhile.
> 
> Cheers,
> Michael

-- 
Daniel Martí - mvdan at mvdan.cc - http://mvdan.cc/
PGP: A9DA 13CD F7A1 4ACD D3DE  E530 F4CA FFDB 4348 041C
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