Implement null safety #163
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@tiholic any chance of approving? |
| private final Registrar registrar; | ||
| private final StreamsChannel streamsChannel; | ||
| private FlutterPluginBinding flutterPluginBinding; | ||
| private StreamsChannel streamsChannel; |
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reason for streamsChannel not being final?
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The new Android embedding 2.0 calls the default constructor initially (very annoying) so we can not initializer the stream channel. The onAttachedToEngine calls our private constructor which initializes StreamChannel. If the default constructor did not get called or we set a dummy value for it ion this constructor then that would work but is not very elegant.
| // final AdharaSocketIoPlugin plugin = new AdharaSocketIoPlugin(registrar, streamsChannel); | ||
| // final MethodChannel channel = new MethodChannel(registrar.messenger(), PlatformConstants.MethodChannelNames.managerMethodChannel); | ||
| // channel.setMethodCallHandler(plugin); | ||
| // } |
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It would be good to avoid unwanted commented code.
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I could not agree more. I will remove.
example/lib/main.dart
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| List<String> toPrint = ['trying to connect']; | ||
| SocketIOManager manager; | ||
| List<String?> toPrint = ['trying to connect']; | ||
| SocketIOManager? manager; |
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This can be late SocketIOManager manager, thus avoiding the need to add manager! everywhere else in this file
lib/manager.dart
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| @@ -33,7 +33,7 @@ class SocketIOManager { | |||
| MethodChannelNames.streamsChannel, | |||
| ); | |||
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| final _sockets = <int, SocketIO>{}; | |||
| final _sockets = <int?, SocketIO>{}; | |||
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the key is supposed to be strict int. Any other possibilities are to be filtered out in usages below.
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The problem is that: -
final index = await _channel.invokeMethod(
PlatformMethod.newInstance,
{
'options': options.asMap(),
'clear': _clearExisting,
},
);
Returns a Future<int?> as per the MethodChannel contract so we would need to provide a default with ??.
| completer.complete(arguments); | ||
| } | ||
| }); | ||
| } | ||
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| Completer _connectSyncCompleter; | ||
| Completer? _connectSyncCompleter; |
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You set it to null in: -
void cleanup() {
onConnectSubscription.cancel();
onConnectErrorSubscription.cancel();
_connectSyncCompleter = null;
}
So it has to have the ?
lib/socket.dart
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| @@ -120,7 +128,7 @@ class SocketIO { | |||
| } | |||
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| /// checks whether connection is alive | |||
| Future<bool> isConnected() => _channel.invokeMethod( | |||
| Future<bool?> isConnected() => _channel.invokeMethod( | |||
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If we can implement a method that ensures returning of null-safe values like the one i created here would avoid usage of unwanted ? and !
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I will throw an exception, it does mean we have to await though.
pubspec.yaml
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| flutter: ">=1.22.6" | ||
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| dependencies: | ||
| flutter: | ||
| sdk: flutter | ||
| pedantic: ^1.9.2 | ||
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| dev_dependencies: | ||
| adhara_socket_io_example: | ||
| path: example |
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what is the need for example as a dev dependency?
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I forgot there reason why, but I have removed it now.
| @@ -11,7 +11,7 @@ import 'streams_channel.dart'; | |||
| /// A socket instance internally used by the [SocketIOManager] | |||
| class SocketIO { | |||
| /// Socket -or- Connection identifier | |||
| final int id; | |||
| final int? id; | |||
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@ihancock I see the support for minSDK version is changed from 16 to 21. What is the reason for increasing the min value? And if it is justifyable, we can also remove unwanted android versions from workflow files |
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Is this ever going to be completed? Seems to be some issues with the |
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It's been a while without any input. |
First pass untested