[jira] [Assigned] (IGNITE-15801) Annotation-based injection of ServiceContext in Ignite services.

["Pavel Pereslegin (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-15801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pavel Pereslegin reassigned IGNITE-15801:
-----------------------------------------

    Assignee: Pavel Pereslegin

> Annotation-based injection of ServiceContext in Ignite services.
> ----------------------------------------------------------------
>
>                 Key: IGNITE-15801
>                 URL: https://issues.apache.org/jira/browse/IGNITE-15801
>             Project: Ignite
>          Issue Type: Improvement
>          Components: managed services
>            Reporter: Pavel Pereslegin
>            Assignee: Pavel Pereslegin
>            Priority: Major
>
> Inject ServiceContext using special annotation.
> Suggested approach for Java services:
> _1. Add init/execute/cancel methods without parameters._
>  _2. Add default no-op implementations for the new methods (this is required_ _to preserve compatibility)._
>  _3. For old methods that take ServiceContext as a parameter, add default_ _implementations that delegate to new methods._
>  _4. Deprecate the old methods on the API._
>  _5. On the implementation level, still use the old methods (again - for_ _compatibility)._
>  _6. Finally, add a @ServiceContextResource annotation to inject_ _ServiceContext._
> Pros:
>  1. The annotation-based injection is a user-friendly approach widely used in Ignite.
>  2. The user does not need to implement all the lifecycle methods every time.
> Cons:
>  1. Duplication of methods in the Service interface for an indefinite period.
>  2. Someday we need to remove the old methods, and this will break all ignite services that use the old approach.



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