public static async Task <IList <IServiceInstance> > GetInstancesWithCacheAsync(
this IServiceInstanceProvider serviceInstanceProvider,
string serviceId,
IDistributedCache distributedCache = null,
DistributedCacheEntryOptions cacheOptions = null,
string serviceInstancesKeyPrefix = "ServiceInstances:")
{
// if distributed cache was provided, just make the call back to the provider
if (distributedCache != null)
{
// check the cache for existing service instances
var instanceData = await distributedCache.GetAsync(serviceInstancesKeyPrefix + serviceId).ConfigureAwait(false);
if (instanceData != null && instanceData.Length > 0)
{
return(DeserializeFromCache <List <SerializableIServiceInstance> >(instanceData).ToList <IServiceInstance>());
}
}
// cache not found or instances not found, call out to the provider
var instances = serviceInstanceProvider.GetInstances(serviceId);
if (distributedCache != null)
{
await distributedCache.SetAsync(serviceInstancesKeyPrefix + serviceId, SerializeForCache(MapToSerializable(instances)), cacheOptions ?? new DistributedCacheEntryOptions()).ConfigureAwait(false);
}
return(instances);
}
