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Programming to it is ridiculously simple. Growl may not be much, but it’s a pretty useful “not very much” kind of tool. A user can configure Growl to play sounds (or not) on a per-registered-application basis, set the priority of those notifications on a per-registered-application basis and so on. You could also have it send an e-mail message or tweet (publicly or direct message) to an account. If a message destined to reach your eyes doesn’t find you because you’re on lunch, you can configure Growl to send that message to your phone, tablet or group of other computers. Growl also lets you “forward” messages to other computers. Even networked games could use it, to tell a player when it’s his turn. To systems administrators, this can be incredibly useful for critical-error conditions that require near-immediate human intervention but don’t warrant terminating operations completely.įor the user, this can be a useful tool for a whole slew of things, including a kind of “push notification” system for applications inside the corporate network, such as when particular data records the user cares about (ones he’s currently working on, for example) are being updated, or when events occur within the system (startup, shutdown, system-wide user messages, whatever) need to be pushed in front of the user’s eyes. To developers, this can be useful when long-running tasks (such as builds, data loads, ETL processes and so on) are executing in the background, giving you a heads-up when they’re finished. Growling It doesn’t take much to think of other situations where this functionality can be useful, both inside and outside a developer-minded context. The problem, of course, is if the rebuild isn’t something being kicked off by the developer front-and-center staring at Visual Studio, how would the developer know about build problems? The build system sends a notification to Growl, and it surreptitiously displays the build results to the user, tucked away in the corner where it won’t demand attention or get in the way of whatever he’s doing. Any time a source file was modified, it would trigger a rebuild of the project. This was essentially a “continuous build” system. When I first introduced Growl, for example, it was as part of the Oak build system. Growl does one thing and does it well: It lets you notify a user (or multiple users, if you start thinking about stretching this across the network) of something happening that would otherwise get past him. In fact, sometimes the most elegant solution to a problem is often a small, singularly focused component that follows the Keep it simple, stupid (KISS) principle. Keep in mind not all developer utilities and solutions have to be these large, grand-scale architectural marvels. Fundamentally, though, it’s about providing the user with notification messages, a la the “toaster” messages you used to see back when instant messaging was hot and MSN Messenger was a thing. Then you can send these messages across the network as encrypted or password-protected, to avoid having network sniffers watch the traffic. When a message comes through, it pops up a small message box to alert the user.
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It resides on your machine, hiding out in the notification tray in the lower-right corner of your Windows desktop view, and listens for notifications.
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Growl (available for download for Windows at ) is the Windows port of the Mac utility of the same name and is billed as the “Ultimate Notification System.” Fundamentally, it isn’t difficult to understand. You could build a simple little UI utility to give you that, or you could leverage somebody else’s utility that’s already built and debugged and likely has a lot more features than you’d include. You still need ways to reach out to the user, though, and ask him to perform actions. A lot of what happens, particularly with enterprise systems, are “headless” kinds of operations with no UI. In all the histrionics that get stirred up around UI and UX, you often lose sight of the fact that sometimes the best UI isn’t the fanciest, most dazzling display of HTML/CSS/JavaScript or mind-blowing animations, but a simple message tucked away in the corner. Volume 29 Number 5 The Working Programmer : Growl Notification System: Simpler Is Better