public static void ConfigAndWatch(IXmlConfig configEntity, FileInfo configFile)
{
Logger.Debug($"Config and watch file:{configFile}");
if (configFile == null)
{
Logger.Debug($"Configure called with null 'configFile' parameter");
return;
}
if (configEntity == null)
{
Logger.Debug($"Configure called with null 'configEntity' parameter");
return;
}
InternalConfigure(configEntity, configFile);
try
{
lock (Configurators)
{
if (Configurators.TryGetValue(configFile.FullName, out var handler))
{
handler?.Dispose();
}
Configurators[configFile.FullName] = new XmlConfigurator(configEntity, configFile);
}
}
catch (Exception ex)
{
Logger.Error(
$"Failed to initialize configuration file watcher for the file:{configFile.FullName}, due to:{ex}");
}
}
private static void InternalConfigure(IXmlConfig configEntity, FileInfo configFile)
{
if (configFile == null)
{
Logger.Debug($"Configure called with null 'configFile' parameter");
return;
}
Logger.Debug($"Configuring file:{configFile.FullName}");
if (File.Exists(configFile.FullName))
{
FileStream fileStream = null;
for (var retry = 5; --retry >= 0;)
{
try
{
fileStream = configFile.Open(FileMode.Open, FileAccess.Read, FileShare.Read);
break;
}
catch (IOException ex)
{
if (retry == 0)
{
Logger.Error($"Failed to open XML config file:{configFile.FullName}, due to:{ex}");
// The stream cannot be valid
fileStream = null;
}
Thread.Sleep(250);
}
}
if (fileStream == null)
{
return;
}
try
{
// Load the configuration from the stream
InternalConfigure(configEntity, fileStream);
}
finally
{
// Force the file closed whatever happens
fileStream.Close();
}
}
else
{
Logger.Debug($"Config file {configFile.FullName} not found. Configuration unchanged.");
}
}
private XmlConfigurator(IXmlConfig configEntity, FileInfo configFile)
{
_configFile = configFile;
_xmlConfigEntity = configEntity;
_watcher = new FileSystemWatcher
{
Path = _configFile.DirectoryName,
Filter = _configFile.Name,
NotifyFilter = NotifyFilters.CreationTime | NotifyFilters.LastWrite | NotifyFilters.FileName
};
_watcher.Changed += ConfigFileChangedHandler;
_watcher.Created += ConfigFileChangedHandler;
_watcher.Deleted += ConfigFileChangedHandler;
_watcher.Renamed += ConfigFileRenamedHandler;
_watcher.EnableRaisingEvents = true;
_timer = new Timer(OnConfigFileChanged, null, Timeout.Infinite, Timeout.Infinite);
}
private static void InternalConfigure(IXmlConfig configEntity, FileStream fileStream)
{
if (fileStream == null)
{
Logger.Debug($"Configure called with null 'fileStream' parameter");
return;
}
if (configEntity == null)
{
Logger.Debug($"Configure called with null 'configEntity' parameter");
return;
}
var xmlDoc = new XmlDocument();
try
{
var settings = new XmlReaderSettings
{
DtdProcessing = DtdProcessing.Parse
};
using (var xmlReader = XmlReader.Create(fileStream, settings))
{
xmlDoc.Load(xmlReader);
}
}
catch (Exception ex)
{
Logger.Error($"Error while loading XML configuration, due to:{ex}");
xmlDoc = null;
}
if (xmlDoc != null)
{
Logger.Debug($"Loading XML configuration.");
configEntity.Config(xmlDoc.DocumentElement);
}
}
