public DatastoreResults <T> Query(DatastoreQuery <T> q)
{
var results = new BlockingCollection <DatastoreResult <T> >();
Task.Factory.StartNew(() =>
{
foreach (var item in new DirectoryInfo(_path).EnumerateFiles("*" + ObjectKeySuffix, SearchOption.AllDirectories)
.Select(f =>
{
var path = f.FullName;
if (path.StartsWith(_path))
{
path = path.Substring(_path.Length);
}
if (Path.IsPathRooted(path))
{
path = path.TrimStart(Path.DirectorySeparatorChar);
}
var key = new DatastoreKey(path.Substring(0, path.IndexOf(ObjectKeySuffix)));
var entry = new DatastoreEntry <T>(key, default(T));
return(new DatastoreResult <T>(entry));
}))
{
if (!results.TryAdd(item, Timeout.Infinite))
{
break;
}
}
})
.ContinueWith(_ => results.CompleteAdding());
return(DatastoreResults <T> .WithCollection(q, results).NaiveQueryApply());
}
private void RunQuery(DatastoreResults <byte[]> .ResultBuilder qrb)
{
byte[] range = null;
if (!string.IsNullOrEmpty(qrb.DatastoreQuery.Prefix))
{
range = Encoding.UTF8.GetBytes(qrb.DatastoreQuery.Prefix);
}
using (var i = _db.NewIterator(ReadOptions.Default))
{
i.SeekToFirst();
if (qrb.DatastoreQuery.Offset > 0)
{
var offset = 0;
while (offset < qrb.DatastoreQuery.Offset)
{
if (range != null)
{
if (i.Key().ToArray().HasPrefix(range))
{
offset++;
}
}
else
{
offset++;
}
i.Next();
}
}
for (var sent = 0; i.Valid(); sent++)
{
if (qrb.DatastoreQuery.Limit > 0 && sent >= qrb.DatastoreQuery.Limit)
{
break;
}
if (qrb.Cancellation.IsCancellationRequested)
{
break;
}
if (range != null && i.Key().ToArray().HasPrefix(range))
{
var k = new DatastoreKey(i.Key().ToString());
var v = qrb.DatastoreQuery.KeysOnly ? null : i.Value().ToArray();
var e = new DatastoreEntry <byte[]>(k, v);
if (!qrb.Output.TryAdd(new DatastoreResult <byte[]>(e), Timeout.Infinite, qrb.Cancellation.Token))
{
break;
}
}
i.Next();
}
}
}
