Hello Dean,
What is Local.java ? Do you mean thread local? Please show an example of
what you would like to happen.
Best regards,
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Ceki
On 22.03.2018 14:51, Dean Hiller wrote:
Has anyone requested the jdk to add Local.java to CompletableFuture.java
so that context can be transferred through the .thenApply and
.thenCompose methods. ie. can we make MDC work in java-land with
CompletableFutures? (it works in scala land with twitter scala Future
by swapping the MDC out for the below thing I describe)
let me go into more detail here. We use twitter Future.scala which
knows about Local.scala and Local.scala "acts" like a ThreadLocal. I
say acts because when you do future.map/flatMap(in java that is
thenApply/thenCompose), it transfers the threadlocal through to the next
executing function.
soooo, long story short, in twitter servers, I can say
MDC.put("requestId", someRequestId) and it works over the
.map/.flatMap. This is not possible in java!!!!! ahhhhh....
and I wrote a whole webserver in java with CompletableFutures before I
found this out https://github.com/deanhiller/webpieces
ps. their response was that it would be a global. Sure, but I am
practical and it solves a huge many platform problems like MDC, and some
in my server where I don't know the customers code(and I had to hack
around not having a Local type thing available :( ).
Another reason they elude to is some methods they don't know how to
handle Local in those cases(yup, well scala had the same thing but it
managed to implement it because it was too important and now java is
behind :( ).
Anyways, it would be nice if others spoke up before they realize they
need it for the MDC to keep working.
thanks,
Dean
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--
Ceki Gülcü
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