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Creation of IEclipseContext [message #986882]

Thu, 22 November 2012 04:09

Dirk Fauth
Messages: 524
Registered: July 2012

Senior Member

Hi,

I have read that it is supported and preferred to create your own IEclipseContext to avoid context variable collisions.

We are thinking of adding DI to NatTable in some kind of way. We are still working on the architecture, so I don't want to start the discussion on how and why here. I just want to gather some information to find the "best" solution.

As NatTable is a complex framework, I thought of creating an IEclipseContext for every NatTable instance itself to avoid variable collisions if you use more than one NatTable in a part.

So there are currently two questions on that:

1. Which is the preferred way to create a new IEclipseContext and add it to the context hierarchy?

I have seen two ways doing this:

public IEclipseContext createContext(IEclipseContext parentContext) {
	//Option 1: create by factory and set parent
	IEclipseContext context1 = EclipseContextFactory.create();
	context1.setParent(parentContext);
		
	//Option 2: create child of parent
	IEclipseContext context2 = parentContext.createChild();

	...
}

Is there any advantage for one of them?

2. How to tell the classes in NatTable that they should use / are connected to our created context? Do we have to add something there or is this handled by the Eclipse platform itself?

Thanks for your help in advance,
Dirk

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Re: Creation of IEclipseContext [message #986921 is a reply to message #986882]

Thu, 22 November 2012 06:21

Thomas Schindl
Messages: 4462
Registered: July 2009

Senior Member

Am 22.11.12 10:09, schrieb Dirk Fauth:
> Hi,
>
> I have read that it is supported and preferred to create your own
> IEclipseContext to avoid context variable collisions.
>
> We are thinking of adding DI to NatTable in some kind of way. We are
> still working on the architecture, so I don't want to start the
> discussion on how and why here. I just want to gather some information
> to find the "best" solution.
>
> As NatTable is a complex framework, I thought of creating an
> IEclipseContext for every NatTable instance itself to avoid variable
> collisions if you use more than one NatTable in a part.
>
> So there are currently two questions on that:
>
> 1. Which is the preferred way to create a new IEclipseContext and add it
> to the context hierarchy?
>
> I have seen two ways doing this:
>
> public IEclipseContext createContext(IEclipseContext parentContext) {
> //Option 1: create by factory and set parent
> IEclipseContext context1 = EclipseContextFactory.create();
> context1.setParent(parentContext);
>
> //Option 2: create child of parent
> IEclipseContext context2 = parentContext.createChild();
>
> ...
> }
>
> Is there any advantage for one of them?

Option 2 is better - you should also give your context a name so this
helps with debugging!

>
> 2. How to tell the classes in NatTable that they should use / are
> connected to our created context? Do we have to add something there or
> is this handled by the Eclipse platform itself?
>

Classes who are created through ContextInjectionFactory.create are by
default registered with the given context and are informed when the
context is diposed if the have an @PreDestroy method.

If the object is created by hand you can push it into the
IEclipseContext by calling CIF.invoke.

Tom

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Re: Creation of IEclipseContext [message #986924 is a reply to message #986921]

Thu, 22 November 2012 06:37

Dirk Fauth
Messages: 524
Registered: July 2012

Senior Member

Thanks for the quick reply Tom. Yesterday I told my colleagues about ContextInjectionFactory and how it should be used, today I'm asking the same question I answered yesterday. Need holidays!

I guess you mean ContextInjectionFactory.make instead of ContextInjectionFactory.create?

[Updated on: Thu, 22 November 2012 06:49]

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