public void StartWatchFolder(FileInfo configFileInfo, params string[] topicMessages)
{
if (configFileInfo == null)
{
throw new ArgumentNullException(nameof(configFileInfo));
}
if (!IsFolder(configFileInfo.FullName))
{
throw new ArgumentException("The configuration folder is not a real folder");
}
FileSystemWatcher watcher = new FileSystemWatcher
{
Path = configFileInfo.FullName,
NotifyFilter =
NotifyFilters.LastAccess |
NotifyFilters.LastWrite |
NotifyFilters.FileName |
NotifyFilters.DirectoryName,
Filter = configFileInfo.Extension,
EnableRaisingEvents = true,
};
observableFileSystemWatcher.SetFile(watcher);
configWatcherDisposable.Disposable = observableFileSystemWatcher.Changed.SubscribeOn(
rxSchedulerService.TaskPool).Throttle(TimeSpan.FromMilliseconds(500)).Subscribe(
async x =>
{
await this.fileProcessingHandler.ProcessingMessageAsync(configFileInfo, topicMessages);
},
ex =>
{
logger.Info($"Error encountered attempting to read new config data from config file {configFileInfo.Name}");
},
() =>
{
logger.Info($"Finish processing file {configFileInfo.Name}");
});
}
private void CreateConfigWatcher(FileInfo configFileInfo)
{
FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = configFileInfo.DirectoryName;
watcher.NotifyFilter =
NotifyFilters.LastAccess |
NotifyFilters.LastWrite |
NotifyFilters.FileName |
NotifyFilters.DirectoryName;
watcher.Filter = configFileInfo.Name;
_observableFileSystemWatcher.SetFile(watcher);
//FSW is notorious for firing twice see here :
//http://stackoverflow.com/questions/1764809/filesystemwatcher-changed-event-is-raised-twice
//so lets use Rx to Throttle it a bit
_configWatcherDisposable.Disposable = _observableFileSystemWatcher.Changed.SubscribeOn(
_rxSchedulerService.TaskPool).Throttle(TimeSpan.FromMilliseconds(500)).Subscribe(
async x =>
{
//at this point the config has changed, start a critical section
using (var releaser = await _lock.LockAsync())
{
//tell current scheduled job that we need to read new config, and wait for it
//to signal us that we may continue
_log.Log($"Config file {configFileInfo.Name} has changed, attempting to read new config data");
_schedulingAssistanceService.RequiresNewSchedulerSetup = true;
_schedulingAssistanceService.SchedulerRestartGate.WaitAsync().GetAwaiter().GetResult();
//recreate the AzureBlobConfiguration, and recreate the scheduler using new settings
ConfigurationManager.RefreshSection("schedulingConfiguration");
var newSchedulingConfiguration = SimpleConfig.Configuration.Load <SchedulingConfiguration>();
_log.Log($"SchedulingConfiguration section is now : {newSchedulingConfiguration}");
ContainerOperations.ReInitialiseSchedulingConfiguration(newSchedulingConfiguration);
ReScheduleJob();
}
},
ex =>
{
_log.Log($"Error encountered attempting to read new config data from config file {configFileInfo.Name}");
});
}