[jira] [Commented] (IGNITE-15794) Request attributes for a java service.

["Ivan Daschinsky (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-15794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17444352#comment-17444352 ] 

Ivan Daschinsky commented on IGNITE-15794:
------------------------------------------

[~xtern] Looks good to me. Lets' wait for the bot's visa.

> Request attributes for a java service. 
> ---------------------------------------
>
>                 Key: IGNITE-15794
>                 URL: https://issues.apache.org/jira/browse/IGNITE-15794
>             Project: Ignite
>          Issue Type: Sub-task
>          Components: managed services
>            Reporter: Pavel Pereslegin
>            Assignee: Pavel Pereslegin
>            Priority: Major
>              Labels: iep-79, ise
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> Implement support for passing implicit "request" attributes from the proxy to the Java service.
> *Implementation notes*.
>  # If no caller attributes are passed - there should be no performance overhead when executing service methods.
>  # Attributes allow only {{string}} and {{byte[]}} values and does not permit nulls in key/values.
>  # Currently, the context should be immutable, but in the future, it should be possible to change it through the interceptor.
>  # {{ServiceResource}} annotation allows to inject service/proxy, we must provide the ability to transparently pass the context to the injected service.
> *Public API changes:*
> New methods in {{IgniteServices}}  to pass caller context to service proxy.
> {code:java}
> public <T> T serviceProxy(String name, Class<? super T> svcItf, boolean sticky, ServiceCallContext callCtx)
> public <T> T serviceProxy(String name, Class<? super T> svcItf, boolean sticky, ServiceCallContext callCtx, long timeout)
> {code}
> New method in {{ServiceContext}} for getting caller context inside the service method.
> {code:java}
> /**
>  * Gets context of the current service call.
>  *
>  * @return Context of the current service call, possibly {@code null}.
>  * @see ServiceCallContext
>  */
> @Nullable public ServiceCallContext currentCallContext();
> {code}
> New interface {{ServiceCallContext}}
> {code:java}
> public interface ServiceCallContext {
>     public String attribute(String name);
>     public byte[] binaryAttribute(String name);
> }
> {code}
> And the builder {{ServiceCallContextBuilder}} for creating {{ServiceCallContext}}.
> New property in {{ServiceResource annotation}}.
> {code:java}
> /**
>  * Flag indicating that the service call context should be passed to the injected service.
>  *
>  * @return {@code True} if the service call context should be passed to the injected service.
>  */
> public boolean forwardCallerContext() default false;
> {code}
>  



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