Flutter: Bloc dispose without waiting for the server response
As soon as the user enters in a page, a call to the server will be executed. If the snapshot has data, a stream will be send to the UI with which will create a ListView, otherwise, if the snapshot has an error, a stream error message will be sinked.
So, the call I have:
try {
List answer = await call();
createList.sink.add(answer);
} on Exception catch (e) {
createList.sink.addError(e);
}
The problem is: if the connection is slow, and the user quits that page before the call is completed, the controllers will be disposed and the app will complain that the error cannot be sinked after that I've disposed the controller.
So, is there a way to "abort" the call to the server when the user quits the page?
server dart
flutter call bloc asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
add a comment |
As soon as the user enters in a page, a call to the server will be executed. If the snapshot has data, a stream will be send to the UI with which will create a ListView, otherwise, if the snapshot has an error, a stream error message will be sinked.
So, the call I have:
try {
List answer = await call();
createList.sink.add(answer);
} on Exception catch (e) {
createList.sink.addError(e);
}
The problem is: if the connection is slow, and the user quits that page before the call is completed, the controllers will be disposed and the app will complain that the error cannot be sinked after that I've disposed the controller.
So, is there a way to "abort" the call to the server when the user quits the page?
server dart
flutter call bloc asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
add a comment |
As soon as the user enters in a page, a call to the server will be executed. If the snapshot has data, a stream will be send to the UI with which will create a ListView, otherwise, if the snapshot has an error, a stream error message will be sinked.
So, the call I have:
try {
List answer = await call();
createList.sink.add(answer);
} on Exception catch (e) {
createList.sink.addError(e);
}
The problem is: if the connection is slow, and the user quits that page before the call is completed, the controllers will be disposed and the app will complain that the error cannot be sinked after that I've disposed the controller.
So, is there a way to "abort" the call to the server when the user quits the page?
server dart
flutter call bloc asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
As soon as the user enters in a page, a call to the server will be executed. If the snapshot has data, a stream will be send to the UI with which will create a ListView, otherwise, if the snapshot has an error, a stream error message will be sinked.
So, the call I have:
try {
List answer = await call();
createList.sink.add(answer);
} on Exception catch (e) {
createList.sink.addError(e);
}
The problem is: if the connection is slow, and the user quits that page before the call is completed, the controllers will be disposed and the app will complain that the error cannot be sinked after that I've disposed the controller.
So, is there a way to "abort" the call to the server when the user quits the page?
server dart
flutter call bloc server dart
flutter call bloc asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
asked Jan 1 at 19:15
Little MonkeyLittle Monkey
18912
18912
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Using the controller's isClosed property, you could just check if the controller is closed before adding the events, like so:
try {
List answer = await call();
if (!createList.isClosed) {
createList.sink.add(answer);
}
} on Exception catch(e) {
if (!createList.isClosed) {
createList.sink.addError(e);
}
}
answered Jan 2 at 22:39
MarcelMarcel
978515
I think you put a "sink" more. I just do "!createList.isClosed"
– Little Monkey
Jan 6 at 17:05
Of course, you're right. I fixed the code now.
– Marcel
Jan 6 at 22:57
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Using the controller's isClosed property, you could just check if the controller is closed before adding the events, like so:
try {
List answer = await call();
if (!createList.isClosed) {
createList.sink.add(answer);
}
} on Exception catch(e) {
if (!createList.isClosed) {
createList.sink.addError(e);
}
}
answered Jan 2 at 22:39
MarcelMarcel
978515
I think you put a "sink" more. I just do "!createList.isClosed"
– Little Monkey
Jan 6 at 17:05
Of course, you're right. I fixed the code now.
– Marcel
Jan 6 at 22:57
add a comment |
Using the controller's isClosed property, you could just check if the controller is closed before adding the events, like so:
try {
List answer = await call();
if (!createList.isClosed) {
createList.sink.add(answer);
}
} on Exception catch(e) {
if (!createList.isClosed) {
createList.sink.addError(e);
}
}
answered Jan 2 at 22:39
MarcelMarcel
978515
I think you put a "sink" more. I just do "!createList.isClosed"
– Little Monkey
Jan 6 at 17:05
Of course, you're right. I fixed the code now.
– Marcel
Jan 6 at 22:57
add a comment |
Using the controller's isClosed property, you could just check if the controller is closed before adding the events, like so:
try {
List answer = await call();
if (!createList.isClosed) {
createList.sink.add(answer);
}
} on Exception catch(e) {
if (!createList.isClosed) {
createList.sink.addError(e);
}
}
answered Jan 2 at 22:39
MarcelMarcel
978515
Using the controller's isClosed property, you could just check if the controller is closed before adding the events, like so:
try {
List answer = await call();
if (!createList.isClosed) {
createList.sink.add(answer);
}
} on Exception catch(e) {
if (!createList.isClosed) {
createList.sink.addError(e);
}
}
answered Jan 2 at 22:39
MarcelMarcel
978515
edited Jan 6 at 22:57
answered Jan 2 at 22:39
MarcelMarcel
978515
answered Jan 2 at 22:39
MarcelMarcel
978515
answered Jan 2 at 22:39
MarcelMarcel
978515
978515
I think you put a "sink" more. I just do "!createList.isClosed"
– Little Monkey
Jan 6 at 17:05
Of course, you're right. I fixed the code now.
– Marcel
Jan 6 at 22:57
add a comment |
I think you put a "sink" more. I just do "!createList.isClosed"
– Little Monkey
Jan 6 at 17:05
Of course, you're right. I fixed the code now.
– Marcel
Jan 6 at 22:57
I think you put a "sink" more. I just do "!createList.isClosed"
– Little Monkey
Jan 6 at 17:05
I think you put a "sink" more. I just do "!createList.isClosed"
– Little Monkey
Jan 6 at 17:05
Of course, you're right. I fixed the code now.
– Marcel
Jan 6 at 22:57
Of course, you're right. I fixed the code now.
– Marcel
Jan 6 at 22:57
add a comment |
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