Hi, Am 02.12.2016 um 15:48 schrieb Garret Wilson: > Using `org.apache.commons:commons-configuration2:2.1` my application > needs to know when a configuration file has been reloaded so that it can > update some things in the program. Apache Commons Configuration2 uses a > lot of strategies and factories, and usually that's great, but here it's > getting so complicated I can't figure out where I need to install a > listener. > > The application has this: > > configConfigurationBuilder = new > ReloadingFileBasedConfigurationBuilder<FileBasedConfiguration>( > PropertiesConfiguration.class) > .configure(new > Parameters().properties().setFile(getConfigFile())); > final PeriodicReloadingTrigger configReloadingTrigger = new > PeriodicReloadingTrigger( > configConfigurationBuilder.getReloadingController(), null, 1, > TimeUnit.MINUTES); > configReloadingTrigger.start(); > > Which of these various things can I install a listener on? I just want > to be notified when the configuration file is reloaded. > > I notice that the `ReloadingDetector` interface has a > `reloadingPerformed()` method, and that sounds like what I want. But how > do I add my own `ReloadingDetector`? It seems like the > `ReloadingController` only keeps one `ReloadingDetector` around. Surely > I don't have to subclass `ReloadingDetector` and install a custom one, > would I? I'm not wanting to specialize the reloading detection, so > subclassing would not be appropriate --- I just want to be notified when > something happens. Besides, it's not obvious to me where I would even > hook into the `ReloadingFileBasedConfigurationBuilder` chain of events > where it uses some internal factor to create the detector. > > So how can I easily get Apache Commons Configuration2 to notify me when > it reloads a configuration?
You can add an event listener at the ReloadingController, then you receive notifications of type ReloadingEvent. Alternatively, you could also register a more generic listener for events on the configuration builder itself. When the builder's managed configuration is reset, a corresponding event is produced. This also happens during a reload operation. Oliver > > Garret > > P.S Does no one monitor Stack Overflow? It is a real pain to subscribe > to this old-fashioned mailing list---a general one for all Apache > Commons, at that!---just to ask a technical question. Below is the > unanswered Stack Overflow question I posted. > > http://stackoverflow.com/q/40917757/421049 > > If you were to answer this question on Stack Overflow it would help a > lot more people than simply replying on this obscure mailing list. Just > a suggestion. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@commons.apache.org > For additional commands, e-mail: user-h...@commons.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
