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How to listen to server status changes, especially on shutdown
January 17, 2019
15:46, EET
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Thomas Reuther
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Hi,

I am using Java SDK 3.1.6. My server uses a timer to repeatedly trigger events in a separate thread. When the server shuts down there is always an exception when this thread is executed (“Exception in thread “Timer-0″ com.prosysopc.ua.server.UaInstantiationException: Could not get type node.”)
I want to stop the timer when the server is going to shut down. I assume it is not the best way to read a node’s value (e.g. ServerStatus) because the reading might fail.

Is there a good way to get notified when the server is going to shut down to stop my extra threads?

Luckily there are no damages when this exception occurs. But it looks awful if there is always an exception message on shutdown. And the return value of this process is always Bad (not 0/Success).

Thomas

January 18, 2019
15:53, EET
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Bjarne Boström
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Hi,

Is there any reason you cannot simply stop the timer before you call UaServer.shutdown?

If not possible then I would need more details, e.g. is also the JVM shutting down or just a single server? If whole JVM, most applications have a somewhat central place to handle shutdown and they usually register a shutdownhook via Runtime.getRuntime().addShutdownHook (https://docs.oracle.com/javase/8/docs/api/java/lang/Runtime.html#addShutdownHook-java.lang.Thread-). It of course depends on what conditions and how the shutdown is triggered.

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