Hi Tim,
as always this is super informative :) Thanks.
Should I then use ComponentServiceObjects too when I'm not in the
context of a @Component annotated class?
In my last sketch for the OSGi integration in Vaadin Flow I used
ServiceObjects instead. Would ComponentServiceObjects be better here?
This is the class I'm talking about:
https://github.com/Sandared/flow-osgi/blob/master/flow.osgi.integration/src/main/java/io/jatoms/flow/osgi/integration/v2/OSGiInstantiatorV2.java
Kind regards,
Thomas
------ Originalnachricht ------
Von: "Tim Ward" <tim.w...@paremus.com>
An: "Thomas Driessen" <thomas.driessen...@gmail.com>; "OSGi Developer
Mail List" <osgi-dev@mail.osgi.org>
Gesendet: 19.02.2019 14:02:21
Betreff: Re: [osgi-dev] ComponentServiceObjects vs ServiceObjects
As I get it ComponentServiceObjects are just for use within Components
and are obtained vie @Reference?
Yes - you should *always* use ComponentServiceObjects if you want to
get on-demand instances of a prototype scope service inside your DS
component.
But why are not ServiceObjects used for this?
ServiceObjects is a low-level API. You are responsible for ensuring
that *every* call to get is balanced by a call to unget. This gives
your component a big tidy-up job in its deactivate method (and other
places as necessary). If you use ComponentServiceObjects then DS is
able to track all of the instances that you’ve created and make sure
that they all get released automatically if your component is
deactivated or the reference is rebound (for example with a greedy
dynamic mandatory reference).
ComponentServiceObjects is therefore much safer to use than
ServiceObjects as you don’t need to be worried about the mess that
could be ongoing when your component stops. Note that if your component
can create a potentially unlimited number of service instances from the
ComponentServiceObjects you must still make sure to release instances
that you create. If you fail to do this you will run out of memory.
I hope this helps.
Tim
On 19 Feb 2019, at 13:53, Thomas Driessen via osgi-dev
<osgi-dev@mail.osgi.org> wrote:
Hi,
can someone explain to me the difference between
ComponentServiceObjects and ServiceObjects and when to use which?
As I get it ComponentServiceObjects are just for use within Components
and are obtained vie @Reference? But why are not ServiceObjects used
for this?
Kind regards,
Thomas
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