private void ParseSchemaFile(string schemaFilename)
{
if (!string.IsNullOrWhiteSpace(schemaFilename) && File.Exists(schemaFilename))
{
// Make sure the following logic is only run once at any time
lock (_parseLock)
{
// Check for an existing schema file entry under a different path.
string currentPath;
if (!_filenameToPath.TryGetValue(Path.GetFileName(schemaFilename), out currentPath))
{
currentPath = schemaFilename;
}
SchemaParser parser;
if (_schemaFileParsers.TryGetValue(currentPath, out parser))
{
if (currentPath != schemaFilename)
{
_schemaFileParsers.TryRemove(currentPath, out parser);
QueueParserWorker(schemaFilename);
}
else
{
CurrentParser = parser;
}
}
else
{
QueueParserWorker(schemaFilename);
}
}
}
}
private void QueueParserWorker(string schemaFilename)
{
CurrentParser = null;
_schemaFileParsers.AddOrUpdate(schemaFilename, CurrentParser, (x, y) => null);
_filenameToPath.AddOrUpdate(Path.GetFileName(schemaFilename), schemaFilename, (x, y) => schemaFilename);
// Start a new task that parses the schema file and sets the current parser (and adds it to the dictionary)
ThreadPool.QueueUserWorkItem((x) =>
{
var newParser = new SchemaParser(schemaFilename);
newParser.Parse();
_schemaFileParsers.AddOrUpdate(schemaFilename, newParser, (z, y) => newParser);
CurrentParser = newParser;
});
}
