![]() ![]() FW processes are configured with a list of directories and regex file patterns to scan for. The decision will depend on whether you require your application to perform other tasks while file notification processing is going on. ![]() This data can be in a variety of formats JSON, CSV, fixed-width binary etc. I strongly dislike putting sleep calls of arbitrary length into test code. With the introduction of CompletableFuture in Java 8, the world of asynchronous programming took a massive step forward.But one may wonder. File watcher KX Stream contains a File Watcher (FW) component for loading batch data in from files. Lightweight graphical Java based file watcher similar in functionality to tail. My desire is to keep the code simple, single threaded, and non blocking but also be testable. This approach saves the application from polling the file system repeatedly for changes. The test fails occasionally, probably because of a race condition between the os/jvm getting the event into the watch service and the test thread polling the watch service. WatchService API is driven by the file system change events triggered by the operating system. ![]() My question is how to reliably test the code. java files and we ignore any other files. FileSystemWatcher is a great little class to take the hassle out of monitoring activity in folders and files but, through no real fault of its own, it can behave unpredictably, firing multiple events for a single action. Below is a short simple example of using a WatchService to keep data in sync with a file. We turn off recursive watching, only direct files are detected. ![]()
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