/// <summary>
/// Create FASTER instance
/// </summary>
/// <param name="size">Size of core index (#cache lines)</param>
/// <param name="comparer">FASTER equality comparer for key</param>
/// <param name="variableLengthStructSettings"></param>
/// <param name="functions">Callback functions</param>
/// <param name="logSettings">Log settings</param>
/// <param name="checkpointSettings">Checkpoint settings</param>
/// <param name="serializerSettings">Serializer settings</param>
public FasterKV(long size, Functions functions, LogSettings logSettings, CheckpointSettings checkpointSettings = null, SerializerSettings <Key, Value> serializerSettings = null, IFasterEqualityComparer <Key> comparer = null, VariableLengthStructSettings <Key, Value> variableLengthStructSettings = null)
{
threadCtx = new FastThreadLocal <FasterExecutionContext>();
prevThreadCtx = new FastThreadLocal <FasterExecutionContext>();
if (comparer != null)
{
this.comparer = comparer;
}
else
{
if (typeof(IFasterEqualityComparer <Key>).IsAssignableFrom(typeof(Key)))
{
this.comparer = new Key() as IFasterEqualityComparer <Key>;
}
else
{
Console.WriteLine("***WARNING*** Creating default FASTER key equality comparer based on potentially slow EqualityComparer<Key>.Default. To avoid this, provide a comparer (IFasterEqualityComparer<Key>) as an argument to FASTER's constructor, or make Key implement the interface IFasterEqualityComparer<Key>");
this.comparer = FasterEqualityComparer <Key> .Default;
}
}
if (checkpointSettings == null)
{
checkpointSettings = new CheckpointSettings();
}
if (checkpointSettings.CheckpointDir != null && checkpointSettings.CheckpointManager != null)
{
throw new Exception("Specify either CheckpointManager or CheckpointDir for CheckpointSettings, not both");
}
checkpointManager = checkpointSettings.CheckpointManager ?? new LocalCheckpointManager(checkpointSettings.CheckpointDir ?? "");
FoldOverSnapshot = checkpointSettings.CheckPointType == core.CheckpointType.FoldOver;
CopyReadsToTail = logSettings.CopyReadsToTail;
this.functions = functions;
if (logSettings.ReadCacheSettings != null)
{
CopyReadsToTail = false;
UseReadCache = true;
}
if (Utility.IsBlittable <Key>() && Utility.IsBlittable <Value>())
{
if (variableLengthStructSettings != null)
{
hlog = new VariableLengthBlittableAllocator <Key, Value>
(logSettings, variableLengthStructSettings, this.comparer, null, epoch);
Log = new LogAccessor <Key, Value, Input, Output, Context>(this, hlog);
if (UseReadCache)
{
readcache = new VariableLengthBlittableAllocator <Key, Value>(
new LogSettings
{
PageSizeBits = logSettings.ReadCacheSettings.PageSizeBits,
MemorySizeBits = logSettings.ReadCacheSettings.MemorySizeBits,
SegmentSizeBits = logSettings.ReadCacheSettings.MemorySizeBits,
MutableFraction = logSettings.ReadCacheSettings.SecondChanceFraction
}, variableLengthStructSettings, this.comparer, ReadCacheEvict, epoch);
readcache.Initialize();
ReadCache = new LogAccessor <Key, Value, Input, Output, Context>(this, readcache);
}
}
else
{
hlog = new BlittableAllocator <Key, Value>(logSettings, this.comparer, null, epoch);
Log = new LogAccessor <Key, Value, Input, Output, Context>(this, hlog);
if (UseReadCache)
{
readcache = new BlittableAllocator <Key, Value>(
new LogSettings
{
PageSizeBits = logSettings.ReadCacheSettings.PageSizeBits,
MemorySizeBits = logSettings.ReadCacheSettings.MemorySizeBits,
SegmentSizeBits = logSettings.ReadCacheSettings.MemorySizeBits,
MutableFraction = logSettings.ReadCacheSettings.SecondChanceFraction
}, this.comparer, ReadCacheEvict, epoch);
readcache.Initialize();
ReadCache = new LogAccessor <Key, Value, Input, Output, Context>(this, readcache);
}
}
}
else
{
hlog = new GenericAllocator <Key, Value>(logSettings, serializerSettings, this.comparer, null, epoch);
Log = new LogAccessor <Key, Value, Input, Output, Context>(this, hlog);
if (UseReadCache)
{
readcache = new GenericAllocator <Key, Value>(
new LogSettings
{
PageSizeBits = logSettings.ReadCacheSettings.PageSizeBits,
MemorySizeBits = logSettings.ReadCacheSettings.MemorySizeBits,
SegmentSizeBits = logSettings.ReadCacheSettings.MemorySizeBits,
MutableFraction = logSettings.ReadCacheSettings.SecondChanceFraction
}, serializerSettings, this.comparer, ReadCacheEvict, epoch);
readcache.Initialize();
ReadCache = new LogAccessor <Key, Value, Input, Output, Context>(this, readcache);
}
}
hlog.Initialize();
sectorSize = (int)logSettings.LogDevice.SectorSize;
Initialize(size, sectorSize);
_systemState = default(SystemState);
_systemState.phase = Phase.REST;
_systemState.version = 1;
_checkpointType = CheckpointType.HYBRID_LOG_ONLY;
}
