public static bool TryFindFile(this IList<FileMetadata> files, Slice key, InternalKeyComparator internalKeyComparator, out int fileIndex)
{
var left = 0;
var right = files.Count;
while (left < right)
{
var mid = (left + right) / 2;
var file = files[mid];
if (internalKeyComparator.Compare(file.LargestKey.TheInternalKey, key) < 0)
{
// Key at "mid.largest" is < "target". Therefore all
// files at or before "mid" are uninteresting.
left = mid + 1;
}
else
{
// Key at "mid.largest" is >= "target". Therefore all files
// after "mid" are uninteresting.
right = mid;
}
}
fileIndex = right;
return fileIndex < files.Count;
}
public LevelFileNumIterator(InternalKeyComparator internalKeyComparator, IList<FileMetadata> files)
{
this.internalKeyComparator = internalKeyComparator;
this.files = files;
MarkAsInvalid();
}
public void T1()
{
var storageState = new StorageState("test", new StorageOptions());
var random = new Random();
var tables = new List<MemTable>();
var expectedCount = 0;
try
{
ulong seq = 0;
for (var i = 0; i < 100; i++)
{
var table = new MemTable(storageState);
for (var j = 0; j < 1000; j++)
{
var k = random.Next();
var key = string.Format("{0:0000000000000000}", k);
table.Add(seq++, ItemType.Value, key, null);
expectedCount++;
}
tables.Add(table);
}
var iterators = tables.Select(table => table.NewIterator()).ToList();
var comparator = new InternalKeyComparator(new CaseInsensitiveComparator());
using (var iterator = new MergingIterator(comparator, iterators))
{
var actualCount = 0;
iterator.SeekToFirst();
Assert.True(iterator.IsValid);
Slice prev = string.Empty;
while (iterator.IsValid)
{
if (!prev.IsEmpty())
{
Assert.True(comparator.Compare(iterator.Key, prev) > 0);
}
prev = iterator.Key.Clone();
iterator.Next();
actualCount++;
}
Assert.Equal(expectedCount, actualCount);
}
}
finally
{
foreach (var table in tables)
table.Dispose();
}
}
public MemTable(int writeBatchSize, InternalKeyComparator internalKeyComparator, BufferPool bufferPool)
{
CreatedAt = DateTime.UtcNow;
_bufferPool = bufferPool;
_memoryAccessor = new UnamangedMemoryAccessor(writeBatchSize);
_internalKeyComparator = internalKeyComparator;
_table = new SkipList<InternalKey, UnamangedMemoryAccessor.MemoryHandle>(_internalKeyComparator);
}
public FileMetadata GetNextFileToCompactForLevel(List <FileMetadata> files, byte[] lastCompactionKey)
{
var comparator = new InternalKeyComparator();
foreach (FileMetadata file in files)
{
if (comparator.Compare(file.SmallestKey, lastCompactionKey) >= 0)
{
return(file);
}
}
return(files.FirstOrDefault());
}
public StorageState(string name, StorageOptions options)
{
_perfCounters = new PerfCounters(name);
_cancellationTokenSource = new CancellationTokenSource();
CancellationToken = _cancellationTokenSource.Token;
Options = options;
InternalKeyComparator = new InternalKeyComparator(options.Comparator);
DatabaseName = name;
Lock = new AsyncLock();
FileSystem = new FileSystem(DatabaseName);
MemTable = new MemTable(this);
TableCache = new TableCache(this);
VersionSet = new VersionSet(this);
Compactor = new BackgroundCompactor(this);
Snapshooter = new Snapshooter(this);
}
private IIterator NewMergingIterator(InternalKeyComparator comparator, IList<IIterator> list)
{
if (list.Count == 0)
return new EmptyIterator();
return list.Count == 1 ? list.First() : new MergingIterator(comparator, list);
}
