public static IEnumerable <KeyValuePair <Key, Value> > EnumerateMergedTablesPreCached(RazorCache cache, string baseFileName, IEnumerable <PageRef> tableSpecs, ExceptionHandling exceptionHandling, Action <string> logger)
{
var tables = tableSpecs.Select(pageRef => new SortedBlockTable(cache, baseFileName, pageRef.Level, pageRef.Version)).ToList();
try {
foreach (var pair in MergeEnumerator.Merge(tables.Select(t => t.Enumerate().ToList().AsEnumerable()), t => t.Key))
{
yield return(pair);
}
} finally {
tables.ForEach(t => t.Close());
}
}
IEnumerable <KeyValuePair <Key, Value> > InternalEnumerateFromKey(byte[] startingKey)
{
if (startingKey == null)
{
yield break;
}
var enumerators = new List <IEnumerable <KeyValuePair <Key, Value> > > ();
Key key = new Key(startingKey, 0);
var rotatedMemTable = _rotatedJournaledMemTable; // Captures a copy of the rotated table if one exists.
enumerators.Add(_currentJournaledMemTable.EnumerateSnapshotFromKey(key)); // Selects the main MemTable.
if (rotatedMemTable != null)
{
enumerators.Add(rotatedMemTable.EnumerateSnapshotFromKey(key));
}
// Checks the files on disk.
using (var manifestSnapshot = _manifest.GetLatestManifest()) {
List <SortedBlockTable> tables = new List <SortedBlockTable> ();
try {
for (int i = 0; i < manifestSnapshot.NumLevels; i++)
{
tables.AddRange(manifestSnapshot.GetPagesAtLevel(i).OrderByDescending(page => page.Version).Select(page => new SortedBlockTable(_cache, _manifest.BaseFileName, page.Level, page.Version)));
}
enumerators.AddRange(tables.Select(t => t.EnumerateFromKey(_cache, key)));
foreach (var pair in MergeEnumerator.Merge(enumerators, t => t.Key))
{
yield return(pair);
}
} finally {
tables.ForEach(table => table.Close()); // Closes all tables.
}
}
}
