@Override
public ListenableFuture<ServiceFilterResponse> handleRequest(
final ServiceFilterRequest request,
final NextServiceFilterCallback nextServiceFilterCallback) {
// In this example, if authentication is already in progress we block the request
// until authentication is complete to avoid unnecessary authentications as
// a result of HTTP status code 401.
// If authentication was detected, add the token to the request.
waitAndUpdateRequestToken(request);
// Send the request down the filter chain
// retrying up to 5 times on 401 response codes.
ListenableFuture<ServiceFilterResponse> future = null;
ServiceFilterResponse response = null;
int responseCode = 401;
for (int i = 0; (i < 5) && (responseCode == 401); i++) {
future = nextServiceFilterCallback.onNext(request);
try {
response = future.get();
responseCode = response.getStatus().getStatusCode();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
if (e.getCause().getClass() == MobileServiceException.class) {
MobileServiceException mEx = (MobileServiceException) e.getCause();
responseCode = mEx.getResponse().getStatus().getStatusCode();
if (responseCode == 401) {
// Two simultaneous requests from independent threads could get HTTP status 401.
// Protecting against that right here so multiple authentication requests are
// not setup to run on the UI thread.
// We only want to authenticate once. Requests should just wait and retry
// with the new token.
if (mAtomicAuthenticatingFlag.compareAndSet(false, true)) {
// Authenticate on UI thread
runOnUiThread(
new Runnable() {
@Override
public void run() {
// Force a token refresh during authentication.
authenticate(true);
}
});
}
// Wait for authentication to complete then update the token in the request.
waitAndUpdateRequestToken(request);
mAtomicAuthenticatingFlag.set(false);
}
}
}
}
return future;
}
private boolean ExceptionIs404NotFound(ExecutionException ex) {
MobileServiceException mse = (MobileServiceException) ex.getCause();
if (ex == null) {
return false;
}
int statusCode = mse.getResponse().getStatus().getStatusCode();
if (statusCode != 404) {
return false;
}
return true;
}