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From Andrus Adamchik <and...@objectstyle.org>
Subject Re: Cayenne ROP Improvements
Date Thu, 05 May 2016 23:55:08 GMT
Thanks for clarification. I would say use Java serialization as a default, and make it easy
to plugin Hessian and Protostuff as separate modules.

A.

> On May 5, 2016, at 5:39 PM, Savva Kolbachev <s.kolbachev@gmail.com> wrote:
> 
> Hi Andrus,
> 
>> So which one is the default, Hessian or Java?
> We still use Hessian for serialization by default
> https://github.com/apache/cayenne/blob/master/cayenne-server/src/main/java/org/apache/cayenne/rop/HessianROPSerializationService.java
> But we use java.net.URLConnection for establish connection and sending
> messages from client to server
> https://github.com/apache/cayenne/blob/master/cayenne-client/src/main/java/org/apache/cayenne/rop/http/HttpROPConnector.java
> So we have escaped from Hessian only in connectivity layer.
> 
>> I don't have a problem with Protostuff being a recommended default, but
> for dependency management purposes I'd rather we split all third-party
> integrations in separate modules, and use whatever provider is hooked up in
> runtime. Kind of what we do with Joda/Java8 extensions.
> I already did it in this way. I created separate module for Protostuff
> serialization.
> 
> As Hessian serialization has some troubles with Java8 types and provide
> less efficient serialization than Protostuff, I suggest to use Protostuff
> as default serialization service or to use Java serialization. So I just
> suggest to escape from Hessian :)
> 
> 2016-05-05 19:41 GMT+03:00 Savva Kolbachev <s.kolbachev@gmail.com>:
> 
>> Hi Ari,
>> 
>> Looks like Protostuff works faster than Protobuf in some cases. For
>> example Serializers (no shared refs) and Cross Lang Binary Serializers
>> sections here http://hperadin.github.io/jvm-serializers-report/report.html
>> 
>> In our case we need to serialize graph of objects (Full Object Graph
>> Serializers section in link above). Protobuf can't do it out of the box
>> but Protostuff can. In my implementation I use protostuff-graph-runtime
>> which generates a schema from objects at runtime and caches it.
>> 
>> Protostuff schema is something like .proto files but in Java:
>> http://www.protostuff.io/documentation/schema/
>> Runtime schema: http://www.protostuff.io/documentation/runtime-schema/
>> 
>> As you could see in benchmarks there is a small difference in efficiency
>> between protostuff-graph and protostuff-graph-runtime. The ser/deser
>> overhead is related to runtime schema generation. The size penalty is that
>> Protostuff adds class name for objects and than uses those for find
>> appropriate classes via reflection.
>> Hessian also adds fields names so the size of Hessian serialization is
>> much bigger. In my small example with selection of 6 objects Hessian
>> serialization size is more than 2400 bytes while Protostuff runtime is
>> about 800 bytes.
>> 
>> If we don't want to have ser/deser and size overhead we could find a way
>> to generate schemas via Velocity. And we should provide schemas for some
>> Cayenne classes. But it will require a lot of efforts.
>> 
>> 
>> 2016-05-05 13:44 GMT+03:00 Aristedes Maniatis <ari@maniatis.org>:
>> 
>>> On 5/05/2016 7:35pm, Savva Kolbachev wrote:
>>>> Protostuff (licensed under Apache 2.0 licence) is based on Google's
>>>> Protocol-Buffers (Protobuf) but has some optimizations and some cool
>>> things
>>>> like runtime serialization graph of objects (like Hessian). It also
>>> could
>>>> generate schema on runtime so we shouldn't define .proto files although
>>> it
>>>> might increase efficiency. It works faster than Hessian and could handle
>>>> Java8 Date and Time types. Here is some benchmarks. Take a look at Full
>>>> Object Graph Serializers section.
>>>> http://hperadin.github.io/jvm-serializers-report/report.html
>>>> https://github.com/eishay/jvm-serializers/wiki
>>> 
>>> According to those benchmarks there appears to be no performance or size
>>> penalty to using protostuff over protobuffers. Am I reading that right?
>>> 
>>> I don't really understand... doesn't the serialiser have to construct a
>>> .proto definition and then include it in the message? So shouldn't it be
>>> faster/smaller to predefine these?
>>> 
>>> If we did, we could create them with velocity in the same way we create
>>> Java _superclasses today. Fairly trivial I'm guessing.
>>> 
>>> Ari
>>> 
>>> 
>>> --
>>> -------------------------->
>>> Aristedes Maniatis
>>> GPG fingerprint CBFB 84B4 738D 4E87 5E5C  5EFA EF6A 7D2E 3E49 102A
>>> 
>> 
>> 
>> 
>> --
>> Thanks and Regards
>> Savva Kolbachev
>> 
> 
> 
> 
> -- 
> Thanks and Regards
> Savva Kolbachev


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