private bool ShouldThrottleEvent(EventThrottleKey key)
{
Timer timer;
if (_eventQueue.TryGetValue(key, out timer))
{
// do nothing. The same event was published a tick ago.
return(true);
}
_eventQueue[key] = new Timer(RemoveFromEventQueue, key, 500, Timeout.Infinite);
return(false);
}
private void OnThemeFileChanged(string name, string fullPath, ThemeFileChangeType changeType)
{
// Enable event throttling by allowing the very same event to be published only all 500 ms.
var throttleKey = new EventThrottleKey(name, changeType);
if (ShouldThrottleEvent(throttleKey))
{
return;
}
if (!_fileFilterPattern.IsMatch(Path.GetExtension(name)))
{
return;
}
var idx = name.IndexOf('\\');
if (idx < 0)
{
// must be a subfolder of "~/Themes/"
return;
}
var themeName = name.Substring(0, idx);
var relativePath = name.Substring(themeName.Length + 1).Replace('\\', '/');
var isConfigFile = relativePath.IsCaseInsensitiveEqual("theme.config");
if (changeType == ThemeFileChangeType.Modified && !isConfigFile)
{
// Monitor changes only for root theme.config
return;
}
BaseThemeChangedEventArgs baseThemeChangedArgs = null;
if (isConfigFile)
{
// config file changes always result in refreshing the corresponding theme manifest
var di = new DirectoryInfo(Path.GetDirectoryName(fullPath));
string oldBaseThemeName = null;
var oldManifest = this.GetThemeManifest(di.Name);
if (oldManifest != null)
{
oldBaseThemeName = oldManifest.BaseThemeName;
}
try
{
// FS watcher in conjunction with some text editors fires change events twice and locks the file.
// Let's wait max. 250 ms till the lock is gone (hopefully).
WaitForUnlock(fullPath);
var newManifest = ThemeManifest.Create(di.FullName, _themesBasePath);
if (newManifest != null)
{
this.AddThemeManifestInternal(newManifest, false);
if (!oldBaseThemeName.IsCaseInsensitiveEqual(newManifest.BaseThemeName))
{
baseThemeChangedArgs = new BaseThemeChangedEventArgs
{
ThemeName = newManifest.ThemeName,
BaseTheme = newManifest.BaseTheme != null ? newManifest.BaseTheme.ThemeName : null,
OldBaseTheme = oldBaseThemeName
};
}
Logger.Debug("Changed theme manifest for '{0}'".FormatCurrent(name));
}
else
{
// something went wrong (most probably no 'theme.config'): remove the manifest
TryRemoveManifest(di.Name);
}
}
catch (Exception ex)
{
Logger.Error(ex, "Could not touch theme manifest '{0}': {1}".FormatCurrent(name, ex.Message));
TryRemoveManifest(di.Name);
}
}
if (baseThemeChangedArgs != null)
{
RaiseBaseThemeChanged(baseThemeChangedArgs);
}
RaiseThemeFileChanged(new ThemeFileChangedEventArgs
{
ChangeType = changeType,
FullPath = fullPath,
ThemeName = themeName,
RelativePath = relativePath,
IsConfigurationFile = isConfigFile
});
}