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E4 Injection/Event System [message #1692371]

Wed, 15 April 2015 11:31

Alexander Klatt

Messages: 59
Registered: April 2014

Member

Hi,

short description: I need to keep three objects in sync.
So, whenever A changes I need to first update B and then update C.
All objects are in the eclipse context.

I came up with the following way, but am unsure if it is unsafe or bad style.
Let's say, we start by injecting object A into the eclipse context:

context.set(A.class, a);

In order to get object B in sync, I was thinking about implementing the following code to a manager class which is always present in the context:

@Inject
@Optional
public void doProcessing(A a) {
    B b = new B(a));
    context.set(B.class, b);
}

Within class C which is created at program startup, I would do the following:

@Inject
@Optional
private A a;

@Inject
@Optional
public void doProcessing(B b) {
    //do something with a and b!
}

What do you think about this? Would you rather use the event system?

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Re: E4 Injection/Event System [message #1692376 is a reply to message #1692371]

Wed, 15 April 2015 11:51

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

[...]

> @Inject
> @Optional
> private A a;
>
> @Inject
> @Optional
> public void doProcessing(B b) {
> //do something with a and b!
> }
>

I'm 99% sure that you could do:

@Inject
@Optional
public void doProcessing(A a, B b) {
//do something with a and b!
}

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Re: E4 Injection/Event System [message #1692383 is a reply to message #1692376]

Wed, 15 April 2015 12:18

Alexander Klatt

Messages: 59
Registered: April 2014

Member

Actually it seems as I must to do it like that.
For my example, object A was null for some reason. Racing condition?

But would you rather use events for this or does it seem okay?

Thomas Schindl wrote on Wed, 15 April 2015 11:51