/// <summary>
/// 保存索引
/// </summary>
public void SaveIndex()
{
if (_index == null)
{
return;
}
lock (_savelock)
{
log.Debug("saving to disk");
_index.SaveIndex();
_deleted.SaveIndex();
log.Debug("index saved");
}
}
private void RebuildDataFiles()
{
MGIndex <string> keys = null;
try
{
// remove old free list
if (File.Exists(_Path + "data.bmp"))
{
File.Delete(_Path + "data.bmp");
}
_datastore = new StorageFileHF(Path.Combine(_Path, "data.mghf"), Global.HighFrequencyKVDiskBlockSize);
_BlockSize = _datastore.GetBlockSize();
if (File.Exists(_Path + "keys.idx"))
{
_log.Debug("removing old keys index");
foreach (var f in Directory.GetFiles(_Path, "keys.*"))
{
File.Delete(f);
}
}
keys = new MGIndex <string>(_Path, "keys.idx", 255, /*Global.PageItemCount,*/ false);
WAHBitArray visited = new WAHBitArray();
int c = _datastore.NumberofBlocks();
for (int i = 0; i < c; i++) // go through blocks
{
if (visited.Get(i))
{
continue;
}
byte[] b = _datastore.ReadBlockBytes(i, _blockheader.Length + 255);
int bnum = Helper.ToInt32(b, 0);
if (bnum > 0) // check if a start block
{
visited.Set(i, true);
_datastore.FreeBlock(i); // mark as free
continue;
}
AllocationBlock ab = new AllocationBlock();
// start block found
int blocknumexpected = 0;
int next = ParseBlockHeader(ab, b, blocknumexpected);
int last = 0;
bool freelast = false;
AllocationBlock old = null;
if (keys.Get(ab.key, out last))
{
old = this.FillAllocationBlock(last);
freelast = true;
}
blocknumexpected++;
bool failed = false;
if (ab.deleteKey == false)
{
while (next > 0) // read the blocks
{
ab.Blocks.Add(next);
b = _datastore.ReadBlockBytes(next, _blockheader.Length + ab.keylen);
next = ParseBlockHeader(ab, b, blocknumexpected);
if (next == -1) // non matching block
{
failed = true;
break;
}
blocknumexpected++;
}
}
else
{
failed = true;
keys.RemoveKey(ab.key);
}
// new data ok
if (failed == false)
{
keys.Set(ab.key, ab.blocknumber); // valid block found
if (freelast) // free the old blocks
{
_datastore.FreeBlocks(old.Blocks);
}
}
visited.Set(i, true);
}
// all ok delete temp.$ file
if (File.Exists(_Path + _dirtyFilename))
{
File.Delete(_Path + _dirtyFilename);
}
}
catch (Exception ex)
{
_log.Error(ex);
}
finally
{
_log.Debug("Shutting down files and index");
_datastore.Shutdown();
keys.SaveIndex();
keys.Shutdown();
}
}