public static void Run()
{
// VarLen types do not need an object log
var log = Devices.CreateLogDevice("hlog.log", deleteOnClose: true);
// Create store
// For custom varlen (not SpanByte), you need to provide IVariableLengthStructSettings and IFasterEqualityComparer
var store = new FasterKV <SpanByte, SpanByte>(
size: 1L << 20,
logSettings: new LogSettings {
LogDevice = log, MemorySizeBits = 15, PageSizeBits = 12
});
// Create session
var s = store.For(new CustomSpanByteFunctions(locking: false)).NewSession <CustomSpanByteFunctions>();
Random r = new Random(100);
// Here, stackalloc implies fixed, so it can be used directly with SpanByte
// For Span<byte> over heap data (e.g., strings or byte[]), make sure to use
// fixed before the FASTER Read/Upsert/RMW operation.
Span <byte> keyMem = stackalloc byte[1000];
Span <byte> valueMem = stackalloc byte[1000];
byte i;
for (i = 0; i < 200; i++)
{
var keyLen = r.Next(1, 1000);
var key = keyMem.Slice(0, keyLen);
key.Fill(i);
var valLen = r.Next(1, 1000);
var value = valueMem.Slice(0, valLen);
value.Fill((byte)valLen);
// Option 1: Using overload for Span<byte>
s.Upsert(key, value);
}
bool success = true;
i = 0;
using (IFasterScanIterator <SpanByte, SpanByte> iterator = store.Log.Scan(store.Log.BeginAddress, store.Log.TailAddress))
{
while (iterator.GetNext(out RecordInfo recordInfo))
{
ref var key = ref iterator.GetKey();
if (key.ToByteArray()[0] != i++)
{
success = false;
break;
}
}
}
public unsafe bool GetNext(out RecordInfo recordInfo)
{
while (true)
{
if (enumerationPhase == 0)
{
if (iter1.GetNext(out recordInfo))
{
ref var key = ref iter1.GetKey();
ref var value = ref iter1.GetValue();
var bucket = default(HashBucket *);
var slot = default(int);
var entry = default(HashBucketEntry);
var hash = fht.Comparer.GetHashCode64(ref key);
var tag = (ushort)((ulong)hash >> Constants.kHashTagShift);
if (fht.FindTag(hash, tag, ref bucket, ref slot, ref entry) && entry.Address == iter1.CurrentAddress)
{
if (recordInfo.PreviousAddress >= fht.Log.BeginAddress)
{
if (tempKvSession.ContainsKeyInMemory(ref key, out _) == Status.OK)
{
tempKvSession.Delete(ref key);
}
}
if (!recordInfo.Tombstone)
{
return(true);
}
continue;
}
else
{
if (recordInfo.Tombstone)
{
tempKvSession.Delete(ref key);
}
else
{
tempKvSession.Upsert(ref key, ref value);
}
continue;
}
}