private Value[][] GetInternal(GetRequest[] valuesToGet,
int backupIndex)
{
var results = new Value[valuesToGet.Length][];
var groupedByEndpoint = from req in valuesToGet
let er = new
{
OriginalIndex = Array.IndexOf(valuesToGet, req),
Get = new ExtendedGetRequest
{
Key = req.Key,
SpecifiedVersion = req.SpecifiedVersion,
Segment = GetSegmentFromKey(req.Key),
}
}
group er by GetEndpointByBackupIndex(topology.Segments[er.Get.Segment], backupIndex) into g
select g;
foreach (var endpoint in groupedByEndpoint)
{
if (endpoint.Key == null)
throw new NoMoreBackupsException();
var requests = endpoint.ToArray();
var getRequests = requests.Select(x => x.Get).ToArray();
var putsResults = GetGetsResults(endpoint.Key, getRequests, backupIndex);
for (var i = 0; i < putsResults.Length; i++)
{
results[requests[i].OriginalIndex] = putsResults[i];
}
}
return results;
}
public Value[] Get(GetRequest request)
{
var values = new List<Value>();
var activeVersions =
request.SpecifiedVersion == null ?
GatherActiveVersions(request.Key) :
new[] { request.SpecifiedVersion };
var foundAllInCache = true;
foreach (var activeVersion in activeVersions)
{
var cachedValue = cache[GetKey(request.Key, activeVersion)] as Value;
if (cachedValue == null ||
(cachedValue.ExpiresAt.HasValue &&
DateTime.Now < cachedValue.ExpiresAt.Value))
{
values.Clear();
foundAllInCache = false;
break;
}
values.Add(cachedValue);
}
if (foundAllInCache)
return values.ToArray();
ApplyToKeyAndActiveVersions(data, activeVersions, request.Key, version =>
{
var value = ReadValueFromDataTable(version, request.Key);
if (value != null)
values.Add(value);
else // remove it from the cache if exists
commitSyncronization.Add(() => cache.Remove(GetKey(request.Key, version)));
});
commitSyncronization.Add(delegate
{
foreach (var value in values)
{
cache[GetKey(value.Key, value.Version)] = value;
}
cache[GetKey(request.Key)] = activeVersions;
});
return values.ToArray();
}