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Add listeners to NodeManagerRoot
May 22, 2023
17:13, EEST
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Francesco Zambon
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Forum Posts: 83
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December 20, 2021
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Good morning,

I need to add an IoManagerListener to the NodeManagerRoot in order to manage the access of the variable:

Root/Objects/Servers/ServerDiagnostics/EnabledFlag

via the method:

@overstep
public AccessLevelType onGetUserAccessLevel(ServiceContext serviceContext, NodeId nodeId, UaVariable uaVariable) {

}

Do you think there is any contraindications? Should i pay attention to anything in particular?

Best regards,
Francesco

May 23, 2023
9:59, EEST
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Bjarne Boström
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April 3, 2012
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Hi,

If you can, it is easier to use com.prosysopc.ua.server.io.IoManagerAdapter instead and only override that method (unless you need others). That way SDK keeps handling internally the same as before you added the listener, as SDK also uses internally this mechanism to return Bad_NotReadable for some of the diagnostics nodes (the base nodes defined in the core namespace) when it is not enabled.

P.S.
Basically the IoManagerAdapter implementation just returns null for all object (including for the java.lang.Boolean) types and false for ‘boolean’ which does mean “this listener didn’t handle it, delegate to next”, you can of course do this manually as well, if you wish to implement the interface directly.

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