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POIs event listener using CPU time
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copied!<p>Maybe this is a dumb question, but do event listeners use CPU cycles like a timer, or are they inactive until the event is fired?</p> <p>Is it language specific, or do all languages handle this basically the same?</p> <p>I want to write a tiny service that only does anything when a network disconnect event is fired, and I don't want the service to use up resources just listening (other than memory of course).</p> <p>I plan to do something like this</p> <pre><code>using NetworkUtilities; ManagementEventWatcher networkAdapterArrivalWatcher = new ManagementEventWatcher("\\root\\wmi","SELECT * FROM MSNdis_NotifyAdapterArrival "); networkAdapterArrivalWatcher.Options.Timeout = new TimeSpan(0,0,5); ManagementEventWatcher networkAdapterRemovalWatcher = new ManagementEventWatcher("\\root\\wmi","SELECT * FROM MSNdis_NotifyAdapterRemoval " ); networkAdapterRemovalWatcher.Options.Timeout = new TimeSpan(0,0,5); ConnectionNotifierHandler handler = new ConnectionNotifierHandler(); networkAdapterArrivalWatcher.EventArrived += new EventArrivedEventHandler(handler.Arrived); networkAdapterRemovalWatcher.EventArrived += new EventArrivedEventHandler(handler.Removed); //Start watching for events networkAdapterArrivalWatcher.Start(); networkAdapterRemovalWatcher.Start(); public void Arrived(object sender, EventArrivedEventArgs e) { using (ManagementBaseObject ev = e.NewEvent) { //Log the event } } public void Removed(object sender, EventArrivedEventArgs e) { using (ManagementBaseObject ev = e.NewEvent) { //Log the event } } </code></pre>

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