qzl
50 lines
1.2 KiB
Dart
50 lines
1.2 KiB
Dart
class CacheDecision {
|
|
final bool canUseCached;
|
|
final bool shouldRefreshInBackground;
|
|
final bool mustBlockForNetwork;
|
|
|
|
const CacheDecision({
|
|
required this.canUseCached,
|
|
required this.shouldRefreshInBackground,
|
|
required this.mustBlockForNetwork,
|
|
});
|
|
}
|
|
|
|
class CachePolicy {
|
|
final Duration softTtl;
|
|
final Duration hardTtl;
|
|
final Duration minRefreshInterval;
|
|
|
|
const CachePolicy({
|
|
required this.softTtl,
|
|
required this.hardTtl,
|
|
this.minRefreshInterval = Duration.zero,
|
|
});
|
|
|
|
CacheDecision evaluate({required DateTime now, required DateTime fetchedAt}) {
|
|
final age = now.difference(fetchedAt);
|
|
if (age >= hardTtl) {
|
|
return const CacheDecision(
|
|
canUseCached: false,
|
|
shouldRefreshInBackground: false,
|
|
mustBlockForNetwork: true,
|
|
);
|
|
}
|
|
|
|
if (age >= softTtl) {
|
|
final shouldRefresh = age >= minRefreshInterval;
|
|
return CacheDecision(
|
|
canUseCached: true,
|
|
shouldRefreshInBackground: shouldRefresh,
|
|
mustBlockForNetwork: false,
|
|
);
|
|
}
|
|
|
|
return const CacheDecision(
|
|
canUseCached: true,
|
|
shouldRefreshInBackground: false,
|
|
mustBlockForNetwork: false,
|
|
);
|
|
}
|
|
}
|