public bool Copy(SimpleFSDirectory sourceLuceneDirectory, Analyzer analyzer, DirectoryInfo targetPath)
{
if (targetPath.Exists == false)
{
Directory.CreateDirectory(targetPath.FullName);
}
//copy index if it exists, don't do anything if it's not there
if (IndexReader.IndexExists(sourceLuceneDirectory) == false) return true;
using (new IndexWriter(
//read from the underlying/default directory, not the temp codegen dir
sourceLuceneDirectory,
analyzer,
_snapshotter,
IndexWriter.MaxFieldLength.UNLIMITED))
{
try
{
//var basePath = IOHelper.MapPath(configuredPath);
var commit = _snapshotter.Snapshot();
var allSnapshotFiles = commit.GetFileNames()
.Concat(new[]
{
commit.GetSegmentsFileName(),
//we need to manually include the segments.gen file
"segments.gen"
})
.Distinct()
.ToArray();
//Get all files in the temp storage that don't exist in the snapshot collection, we want to remove these
var toRemove = targetPath.GetFiles()
.Select(x => x.Name)
.Except(allSnapshotFiles);
//using (var tempDirectory = new SimpleFSDirectory(tempDir))
//{
//TODO: We're ignoring if it is locked right now, it shouldn't be unless for some strange reason the
// last process hasn't fully shut down, in that case we're not going to worry about it.
//if (IndexWriter.IsLocked(tempDirectory) == false)
//{
foreach (var file in toRemove)
{
try
{
File.Delete(Path.Combine(targetPath.FullName, file));
}
catch (IOException ex)
{
//TODO: we're ignoring this, as old files shouldn't affect the index/search operations, lucene files are 'write once'
//TODO: Return some info?
//quit here
//return false;
}
}
//}
//else
//{
// LogHelper.Warn<LocalTempStorageIndexer>("Cannot sync index files from main storage, the index is currently locked");
// //quit here
// return false;
//}
foreach (var fileName in allSnapshotFiles.Where(f => string.IsNullOrWhiteSpace(f) == false))
{
var destination = Path.Combine(targetPath.FullName, Path.GetFileName(fileName));
//don't copy if it's already there, lucene is 'write once' so this file is meant to be there already
if (File.Exists(destination)) continue;
try
{
File.Copy(
Path.Combine(sourceLuceneDirectory.GetDirectory().FullName, "Index", fileName),
destination);
}
catch (IOException ex)
{
//TODO: Return some info?
//quit here
return false;
}
}
//}
}
finally
{
_snapshotter.Release();
}
}
return true;
}
