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Runtime Construction of Topic Strings [message #894378]

Sun, 08 July 2012 23:27

Joseph Carroll

Messages: 174
Registered: May 2012
Location: Milwaukee, WI

Senior Member

I was reading through some of the IEventBroker documentation and read that some of the issues/limitations on using DI to subscribe to events was going to be addressed in M5.
http://wiki.eclipse.org/Eclipse4/RCP/Event_Model#Subscribing_Using_IEventBroker

Is the listed documentation still accurate? Specifically, is dependency injection restricted if the topic string being registering is constructed at runtime?

Thanks,

JD

[Updated on: Sun, 08 July 2012 23:28]

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Re: Runtime Construction of Topic Strings [message #894496 is a reply to message #894378]

Mon, 09 July 2012 12:41

Eclipse User

I don't think that is possible because the @UIEventTopic requires the "value" argument to be a constant expression. If you don't know the topic at compile time I don't think you can subscribe.

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Re: Runtime Construction of Topic Strings [message #894531 is a reply to message #894496]

Mon, 09 July 2012 14:17

Paul Webster

Messages: 6859
Registered: July 2009
Location: Ottawa

Senior Member

You're right, that was changed in 4.2. The topic strings were auto-generated from the model instead of the more flexible "construction at runtime" partly because they were always used the same way and partly to help cases like @UIEventTopic

PW

Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Menu_Contributions

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