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https://issues.apache.org/jira/browse/THRIFT-5084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17031397#comment-17031397
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Alexander Edge commented on THRIFT-5084:
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Hi Jens, thanks for your reply. My answers:

a) I've had a second look at this and it is not a breaking change after all. I 
was concerned that changing the {{TProcessor}} protocol would break existing 
builds, but it's not the case. I have removed the label.

b) Yes, I have added the option of a default processor on 
{{MultiplexedProcessor }}which is used when a non-multiplexed message is 
received. It can be initialised with one or registered after initialisation. It 
will throw an error if no default processor is registered and a non-multiplexed 
message is received.

> Swift: Server-side support for Multiplexing Services
> ----------------------------------------------------
>
>                 Key: THRIFT-5084
>                 URL: https://issues.apache.org/jira/browse/THRIFT-5084
>             Project: Thrift
>          Issue Type: Improvement
>          Components: Swift - Library
>    Affects Versions: 0.13.0
>            Reporter: Alexander Edge
>            Priority: Minor
>              Labels: multiplex
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The Swift library features {{TMultiplexedProtocol}} but not 
> {{TMultiplexedProcessor}}, which is required for use server-side.
> I've added {{TMultiplexedProcessor}}, following the same patterns as the 
> other language libraries. I've marked this issue as _Breaking-Change_ since 
> it removes the {{associatedType}} from the {{TProcessor}} protocol. Since the 
> existing {{TProcessor}} definition uses an {{associatedType, it makes it 
> impossible for TMultiplexedProcessor}} to implement {{TProcessor}}. By 
> definition it should support processors of multiple services, not a single 
> service.
> I've added tests which require a change to {{Package.swift}} to run using 
> {{swift test}}.



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