PowerShell allows you to register more than one handler for a single source identifier but the FSWatcherEngineEvent module doesn’t allow you to create more than one watcher using the same source identifier. Id Name PSJobTypeName State HasMoreData Location Commandġ MyEvent NotStarted False |ConvertTo-Json|Wr… The following example just writes the whole event converted to JSON to the console: PS> Register-EngineEvent -SourceIdentifier "MyEvent" -Action You can consume the event by registering an event handler for the same source identifier. The watcher now sends notifications to PowerShell’s engine event queue using the source identifier “MyEvent”. New-FileSystemWatcher -SourceIdentifier "MyEvent" -Path C:\Tempfiles Please refer to the Microsoft’s reference documentation of the FileSystemWatcher class for the details. IncludeSubdirectory: extends the area of observation to the subdirectories of the specified path.Filter: a wildcard to define a subset of files to watch.NotifyFilter: what kind of change triggers an event (by default: LastWrite, FileName, DirectoryName).The command allows to specify the same parameters (with the same names) as if you are using the C# class directly. As an example, you can watch for changes in directory C:\Tempfiles. It hides the C#-API behind a PowerShell command with argument completion, it keeps track of the created watchers, and provides commands to pause notifications and to clean up the watchers if they are no longer needed.Īfter you install and import the module, you can create a new filesystem watcher. I made the FSWatcherEngineEvent PowerShell module to make these file system watchers easier to use. There are already many examples on the internet showing how to create and configure the watcher in PowerShell but this isn’t something I can easily recall from memory at the moment I need it. A file system watcher listens to change notifications generated by the operating system and invokes a given function if the file change matches several filter criteria like the directory, the file name or the type of the change. NET Framework class named FileSystemWatcher which suits this job perfectly. So right now it's an unreproducible bug, I'll do a few changes to make it log more frequently and monitor the situation.Some time ago I wanted to sync files from a source directory to a destination directory immediately after they had changed in the source directory. Stress testing the program in multiple ways and checking the code over and over again revealed no issues. Private void button2_Click(object sender, EventArgs e) Private void fsw_Error_handler(object sender, ErrorEventArgs e)ĮventLog.WriteEntry("few test", e.GetException().Message) ĮventLog.WriteEntry("fsw test", "Queueing File Started") ĮventLog.WriteEntry("fsw test", ((FileSystemEventArgs)e).Name) ĮventLog.WriteEntry("fsw test", "Queueing File Done") ĮventLog.WriteEntry("fsw test", "Error = " ex.StackTrace " *** " ex.ToString()) New Thread(new ParameterizedThreadStart(work)).Start(e) Private void fsw_Created_handler(object sender, FileSystemEventArgs e) So I believe buffer overflow is out of the question? private void button1_Click(object sender, EventArgs e)įsw.NotifyFilter = NotifyFilters.FileName įsw.Created = new FileSystemEventHandler(fsw_Created_handler) After running it, 3,000 entries can be found in the event log. I've created a test where 1,000 files are created. What can cause an issue like this one to suddenly appear? Is there a possibility that FileSystemWatcher is simply unreliable? No spikes can be seen in the server load. It's been in production for over a year now. The program was last touched over 40 days ago, for a change unrelated to the FileSystemWatcher. It processes 300 files at once without a problem, and reality isn't even close to that. The InternalBufferSize is set to 32 kB to deal with large batches. By manually moving the files to a different directory and then moving them again to the watched directory, the files get noticed. We're talking about 1,500 files from a total of 50,000 files. About 10 days ago, it started to ignore some files. I have a FileSystemWatcher set to check for new files, store the content in a database and delete the files.
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