Hi Tim,

You might also have a look at Stamina 
<https://github.com/scalapenos/stamina>. Keep in mind that this only has 
support for spray-json.

Kind regards,
Jan-Pieter

Op woensdag 21 september 2016 22:02:47 UTC+2 schreef Patrik Nordwall:
>
> For Lagom I wrote json serializer that is using Jackson. You can look at 
> it for inspiration. It's stored in Cassandra as bytes, but how it's stored 
> is less important as far as I can see.
>
> /Patrik
> ons 21 sep. 2016 kl. 17:58 skrev Tim Pigden <tim.p...@optrak.com 
> <javascript:>>:
>
>> Hi Justin
>> Thanks for the comments. However, as I said I have decided that I do want 
>> to use json asa format, so I'm really looking to see who has direct 
>> experience of that. 
>> The serialization format is less orthogonal that you might expect, given 
>> that the database table layouts are all part of the plugin and as far as I 
>> can see, all use blob rather than json format with no obvious way to change 
>> that.
>> And yes the json-ness does make a difference to me. Without going into 
>> elaborate CQRS "Q" coding, it will enable the developers to find out about 
>> how the system is being used, what sort of messages are being created with 
>> what payloads, through simple sql. My increased data volumes are extremely 
>> unlikely to burden a single server db in the short to medium term.
>>
>> Tim
>>
>>
>> On Wednesday, September 21, 2016 at 2:58:27 PM UTC+1, Justin du coeur 
>> wrote:
>>
>>> A few general reactions (personally, I'm using Kryo over Cassandra, so I 
>>> can't address the direct questions):
>>>
>>> Keep in mind that json is a relatively bulky serialization format -- 
>>> it's going to take rather more disk space than more typical options like 
>>> protobuf.
>>>
>>> In *general*, the serialization format and database are pretty 
>>> orthogonal concerns.  It's possible that json might have specific 
>>> advantages when used with a json-native DB like Mongo, but AFAICT the 
>>> Cassandra driver is the most mature in general.  Are you planning on using 
>>> the json-ness in some particular way?
>>>
>>> Finally, remember that json doesn't save you from all the complications 
>>> of schema evolution: you're still going to need to think about how you deal 
>>> with missing fields, name changes, and stuff like that.  It's probably a 
>>> bit easier than Kryo, but only a bit.  Schema evolution is a real bear -- 
>>> making sure I can deal with it took most of my effort in getting 
>>> Persistence up and running...
>>>
>> On Wed, Sep 21, 2016 at 9:16 AM, Tim Pigden <tim.p...@optrak.com> wrote:
>>>
>> Hi
>>>> Reading 
>>>>
>>>> http://doc.akka.io/docs/akka/2.4.10/scala/persistence-schema-evolution.html
>>>>
>>>> and thinking about what we currently do, I've concluded that I'd like 
>>>> to serialize my events as json.
>>>> The article suggests I should check the list of plugins to see which 
>>>> specifically support json. But I can't find clear indications that any of 
>>>> them do from the respective github pages (apologies if I've missed 
>>>> something). Most seem to want the target database tables to be a BLOB with 
>>>> no option of a native json type.
>>>>
>>>> My current database target is Postgres (because we use postgis for 
>>>> mapping and because I need a proper sql database for data warehouse). 
>>>> However, for the event serialization I could certainly contemplate 
>>>> something else if it made the current development path quicker and easier. 
>>>> MongoDB or Cassandra are obvious possible targets.
>>>>
>>>> So my question is: is anyone actually using json as a serialization 
>>>> format, and if so
>>>> a) what database and driver?
>>>> b) is the database-native json support being used (if any?)
>>>> c) how much effort was it? I can already serialize everthing to json 
>>>> that needs to go in the persistence journal or snapshots.
>>>>
>>>> it's got to be something with active support/interest.
>>>>
>>>> Thanks
>>>> tim
>>>>
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