putIfAbsent method
Associates the specified key
with the given value
if not already associated with a value.
key
: key with which the specified value is to be associatedvalue
: value to be associated with the specified key
Returns true
if a value was set.
Implementation
@override
Future<bool> putIfAbsent(String key, dynamic value,
{Duration? expiryDuration}) {
_secondary.putIfAbsent(key, value, expiryDuration: expiryDuration);
return _primary.putIfAbsent(key, value, expiryDuration: expiryDuration);
}