Hi Endre,
Thanks for the explanation.
I was struggling to see why it was necessary for the flow to effectively
generate an object as a side-effect of the materialization.
I guess that this is a corollary of choosing a design where the elements
of the flow are created indirectly (and hence you don't have direct
access to the underlying objects that have been created).
Thanks again,
Rob
On 06/10/2015 14:40, Endre Varga wrote:
Hi Robert,
On Tue, Oct 6, 2015 at 3:29 PM, Robert Wilton <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I've been keeping an eye on the development of akka streams, and I
was just taking a second look at it now.
There is one thing that I can't seem to get my head around, which
is the explicit types associated with materialization.
Compared to the earlier beta versions, it feels to me that the
adding explicit materialization types seems to have added quite a
lot of complexity in the APIs for building and using flows and I
can't see where they are particularly beneficial in the general case.
They also removed quite a bit of complexity though:
- more complex modules that needed to expose a materialized value
needed to also expose the internal Sources/Sinks to the outside world,
since those were keys to the MaterializedMap. Removal of this problem
alone simplified the TCP interfaces greatly.
- Only Sinks and Sources could have a materialized value before. This
is no longer the case, and this is used already.
- due to the MaterializedMap actually being, well, a Map, you cannot
reuse the same Source/Sink twice in the same graph otherwise one would
overwrite the others value in a non-deterministic (hash code
dependent) manner
- due to atomic (non-composite) Sink/Source being the keys to that
map, it was not possible to use a transformed version of them and
still access the value.
The added type-safety is just a nice bonus on top of these.
Presumably there was a compelling argument for adding them - I
just can't figure out what it is! ;-)
If I need to summarize the above, incomplete list, then the short
answer is: composability. The previous map-based model breaked down
for anything non-trivial, while the current one, complex or not,
actually works ;)
-Endre
Thanks,
Rob
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