public BPlusTree(BPlusTreeOptions <TKey, TValue> ioptions)
{
bool fileExists =
ioptions.StorageType == StorageType.Disk &&
ioptions.CreateFile != CreatePolicy.Always &&
File.Exists(ioptions.FileName) &&
new FileInfo(ioptions.FileName).Length > 0;
_options = ioptions.Clone();
_selfLock = _options.CallLevelLock;
_keyComparer = _options.KeyComparer;
_itemComparer = new ElementComparer(_keyComparer);
switch (_options.CachePolicy)
{
case CachePolicy.All: _storage = new NodeCacheFull(_options); break;
case CachePolicy.Recent: _storage = new NodeCacheNormal(_options); break;
case CachePolicy.None: _storage = new NodeCacheNone(_options); break;
default: throw new InvalidConfigurationValueException("CachePolicy");
}
try
{
_storage.Load();
}
catch
{
_storage.Dispose();
throw;
}
if (_options.LogFile != null && !_options.ReadOnly)
{
if (_options.ExistingLogAction == ExistingLogAction.Truncate ||
_options.ExistingLogAction == ExistingLogAction.Default && !fileExists)
{
_options.LogFile.TruncateLog();
}
else if (_options.LogFile.Size > 0 && (
_options.ExistingLogAction == ExistingLogAction.Replay ||
_options.ExistingLogAction == ExistingLogAction.ReplayAndCommit ||
(_options.ExistingLogAction == ExistingLogAction.Default && fileExists)
))
{
bool commit = (_options.ExistingLogAction == ExistingLogAction.ReplayAndCommit ||
(_options.ExistingLogAction == ExistingLogAction.Default && fileExists));
bool merge = false;
if (_options.StorageType == StorageType.Disk)
{
merge = new FileInfo(_options.FileName).Length < _options.LogFile.Size;
}
if (merge) // log data is larger than we are...
{
BulkInsertOptions opts = new BulkInsertOptions();
opts.CommitOnCompletion = commit;
opts.DuplicateHandling = DuplicateHandling.LastValueWins;
opts.InputIsSorted = true;
opts.ReplaceContents = true;
BulkInsert(
_options.LogFile.MergeLog(_options.KeyComparer,
File.Exists(ioptions.FileName) ? EnumerateFile(ioptions) : new KeyValuePair <TKey, TValue> [0]),
opts
);
}
else
{
_options.LogFile.ReplayLog(this);
if (commit) //Now commit the recovered changes
{
Commit();
}
}
}
}
var nodeStoreWithCount = _storage.Storage as INodeStoreWithCount;
if (nodeStoreWithCount != null)
{
_count = nodeStoreWithCount.Count;
_hasCount = _count >= 0;
}
}
public NodeTransaction(NodeCacheBase cache)
{
_cache = cache;
_hasLogToken = false;
_logToken = new TransactionToken();
}
