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Preference not re-injected if changed in ConfigurationScope [message #1691303]

Sun, 05 April 2015 04:53

Michael Bartl

Messages: 14
Registered: July 2009

Junior Member

HI,

For whatever reason the following code is not executed:

@Inject
private void setNotationFont(@Preference(nodePath = "PCDB", value = PreferenceConstants.NOTATIONFONT) String notationFont)
{
/* do something */
}

after changing the font in the ConfigurationScope with the following:

private static Preferences configurationPreferences = ConfigurationScope.INSTANCE.getNode("PCDB");
configurationPreferences.put(key, value);
try
{
configurationPreferences.flush();
} catch (BackingStoreException e)
{
e.printStackTrace();
}

Interestingly it's executed when changed in the InstanceScope.

Is this known behaviour? If yes, why, because it leads to a lot of code duplication.

Br,
Michael

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Re: Preference not re-injected if changed in ConfigurationScope [message #1691304 is a reply to message #1691303]

Sun, 05 April 2015 08:21

Dirk Fauth

Messages: 2903
Registered: July 2012

Senior Member

I'm not sure, but it sounds like there is a value in instance and in configuration scope. Changing the value in configuration scope doesn't automatically change the value in the instance scope. And the value in instance scope "wins" over the value in configuration scope. Therefore only changing the value in configuration scope doesn't trigger a re-injection because the preference value hasn't changed for the current running instance.

But I haven't looked at this case in detail. It is just an assumption.

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Re: Preference not re-injected if changed in ConfigurationScope [message #1691306 is a reply to message #1691304]

Sun, 05 April 2015 09:01

Michael Bartl

Messages: 14
Registered: July 2009

Junior Member

Well, that is true. At first I didn't even want to use the InstanceScop, but if I don't change the value there either it won't re-inject.
So what is the use then or how should it be done, because honestly I only have Configuration Scoped Preferences (as probably 90% of all use-cases for preferences).

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Re: Preference not re-injected if changed in ConfigurationScope [message #1691307 is a reply to message #1691306]

Sun, 05 April 2015 09:03

Dirk Fauth

Messages: 2903
Registered: July 2012

Senior Member

No I mean, is the value also in instance scope at startup? Not sure how to avoid this if you only want to use the configuration scope.

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Re: Preference not re-injected if changed in ConfigurationScope [message #1691375 is a reply to message #1691306]

Mon, 06 April 2015 18:02

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

@Preference is bound to instance scope - just look at the
ExtendedObjectSupplier.

Tom

On 05.04.15 11:01, Michael Bartl wrote:
> Well, that is true. At first I didn't even want to use the InstanceScop,
> but if I don't change the value there either it won't re-inject.
> So what is the use then or how should it be done, because honestly I
> only have Configuration Scoped Preferences (as probably 90% of all
> use-cases for preferences).

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