I am using Timer.periodic
with a duration of 5 seconds to make network calls. These calls usually take no longer than 500ms. I want to reduce the frequency of the timer to 2 seconds, but the callback could take up to 10 seconds in some cases. Is there a way to set a timer with a maximum duration of 1 second, plus the time taken by the callback? Or is there a better way to achieve this?
One way to achieve this is to use Future.delayed
instead of Timer.periodic
. You can set the delay time to 2 seconds and then use Future.timeout
to make sure that the callback doesn’t take longer than 1 second. Here’s an example:
import 'dart:async';
void main() {
startTimer();
}
void startTimer() {
Future.delayed(Duration(seconds: 2)).then((_) {
makeNetworkCall().timeout(Duration(seconds: 1), onTimeout: () {
// Handle timeout
print('Network call timed out');
startTimer();
}).then((result) {
// Handle success
print('Network call succeeded');
startTimer();
}).catchError((error) {
// Handle error
print('Network call failed: $error');
startTimer();
});
});
}
Future<String> makeNetworkCall() {
return Future.delayed(Duration(milliseconds: 700), () {
return 'Result';
});
}
In this example, makeNetworkCall
simulates a network call that takes 700ms. The Future.timeout
method is used to make sure that the callback doesn’t take longer than 1 second. If the callback takes longer than 1 second, the timeout function will be called and the timer will start again. If the callback succeeds or fails within 1 second, the timer will start again after the network call is complete.