github/flutter
7
0
Fork 0
mirror of https://github.com/flutter/flutter.git synced 2025-06-03 00:51:18 +00:00
Code Issues Packages Projects Releases Wiki Activity

Avoid concurrent device polling in daemon; add timeout (#11184)

Browse Source 
Apply a 30 second timeout to Android/iOS device polling.

If there's a device poll already in progress, skip polling for new
devices; wait for the first request to return/timeout.
This commit is contained in:
Chris Bracken 2017-07-12 17:57:15 -07:00 committed by GitHub
parent ae90581124
commit 0adb39ae9b
1 changed files with 17 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
packages/flutter_tools/lib/src/device.dart
View File

@ -111,7 +111,8 @@ abstract class DeviceDiscovery {
abstract class PollingDeviceDiscovery extends DeviceDiscovery {
PollingDeviceDiscovery(this.name);
static const Duration _pollingDuration = const Duration(seconds: 4);
static const Duration _pollingInterval = const Duration(seconds: 4);
static const Duration _pollingTimeout = const Duration(seconds: 30);
final String name;
ItemListNotifier<Device> _items;
@ -122,8 +123,21 @@ abstract class PollingDeviceDiscovery extends DeviceDiscovery {
void startPolling() {
if (_timer == null) {
_items ??= new ItemListNotifier<Device>();
_timer = new Timer.periodic(_pollingDuration, (Timer timer) async {
_items.updateWithNewList(await pollingGetDevices());
bool _fetchingDevices = false;
_timer = new Timer.periodic(_pollingInterval, (Timer timer) async {
if (_fetchingDevices) {
printTrace('Skipping device poll: already in progress');
return;
}
_fetchingDevices = true;
try {
final List<Device> devices = await pollingGetDevices().timeout(_pollingTimeout);
_items.updateWithNewList(devices);
} on TimeoutException {
printTrace('Device poll timed out.');
} finally {
_fetchingDevices = false;
}
});
}
}