[jira] [Comment Edited] (SCB-1385) Provide a common way to pass GID and LID

["Willem Jiang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SCB-1385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16888586#comment-16888586 ] 

Willem Jiang edited comment on SCB-1385 at 7/19/19 7:04 AM:
------------------------------------------------------------

If there is no standard communication protocol, then we can carry the OmegaContext by class wrapper.

1.Pack needs to provide an interface wrapper definition
{code}
Interfae IOmegaContextWrapper {
 OmegaContext context;
 Object original;

wrapper(Object original){
 original = original;
 }

Object getOriginal()
 OmegaContext getOmegaContext();
}
{code}

2.User implements this interface
{code}
class OrderOmegaContextWrapper impl IOmegaContextWrapper {
 
}
{code}
3.Wrap the original parameters and send
{code}
Order order = new Order();
OrderWrapper orderwrapper = OrderOmegaContextWrapper.wrapper(order);
producer.send(orderwrapper)
{code}
4. After the receiver gets the OrderWrapper object, the getOriginal method gets the original parameters.

5. Pack refactoring TransactionAspect, intercepting method parameters, if the parameter implements the interface IOmegaContextWrapper, then you can get OmegaContext from this object.


was (Author: zhangg):
If there is no standard communication protocol, then we can carry the OmegaContext by class wrapper.

1.Pack needs to provide an interface wrapper definition
interfae IOmegaContextWrapper {
 OmegaContext context;
 Object original;

wrapper(Object original){
 original = original;
 }

Object getOriginal()
 OmegaContext getOmegaContext();
}

2.User implements this interface
class OrderOmegaContextWrapper impl IOmegaContextWrapper {
 
}

3.Wrap the original parameters and send
Order order = new Order();
OrderWrapper orderwrapper = OrderOmegaContextWrapper.wrapper(order);
producer.send(orderwrapper)

4. After the receiver gets the OrderWrapper object, the getOriginal method gets the original parameters.

5. Pack refactoring TransactionAspect, intercepting method parameters, if the parameter implements the interface IOmegaContextWrapper, then you can get OmegaContext from this object.

> Provide a common way to pass GID and LID
> ----------------------------------------
>
>                 Key: SCB-1385
>                 URL: https://issues.apache.org/jira/browse/SCB-1385
>             Project: Apache ServiceComb
>          Issue Type: Improvement
>          Components: Saga
>            Reporter: Willem Jiang
>            Assignee: Willem Jiang
>            Priority: Major
>             Fix For: pack-0.5.0
>
>
> When using SNS https://spring.io/projects/spring-cloud-aws to pass the invocation across the services, it's quite important for Omega to pass the Global Transaction ID and Local Transaction ID across the services.
> I just spend some time to check about the message API of spring-cloud-aws, it has a [message converters](https://cloud.spring.io/spring-cloud-static/spring-cloud-aws/2.2.0.M1/#_using_message_converters) which could be used to pass the GID and LID through the business object. 
>  After talking with ZhangLei about this issue, he suggested that we could introduce a wrapper class for the user to pass the GID and LID across thread or VM. As Omega can intercept the method call, we can restore the GID and LID back to thread local variable before calling the intercepted method. 



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