A concrete example:
Imagining you are doing some accounting and your events are a Json
representing any particular operation:
1. {"op":"set", "value":0}
2. {"op":"add", "value":20}
3. {"op":"substract", "value":20}
Then when you reply the events your account total should be zero.
That's the simplest example I could come up with, basically you store each
Json event and your actor "knows" what to do with such information when it
is activated.
HTH,
Guido.
On Sunday, March 12, 2017 at 6:03:31 PM UTC, Justin du coeur wrote:
>
> Generally not -- you define the "event" as a serializable data structure
> that *describes* the transformation to execute, and that gets stored in the
> event stream. When you reload the Actor, you "replay" those events, and
> your recovery logic interprets the events to actually change the data. You
> generally have a function that takes the stream of events and the starting
> state, and does this interpretation.
>
> In principle, I suppose you *could* save the functions themselves as
> bytecode, but I don't think I've ever heard of anyone doing so, and it
> seems quite dangerous -- it could fail to load because dependencies had
> changed, and other such problems. (And it would likely be very bulky and
> redundant.)
>
> On Sun, Mar 12, 2017 at 9:59 AM, kant kodali <[email protected]
> <javascript:>> wrote:
>
>> Hi,
>>
>> What does it mean when someone says we store the event itself rather than
>> storing the state/data? such that the events can be replayed to store the
>> state/data. Does it mean storing the functions/transformation itself
>> (simply put the JVM byte code for the function itself) ?
>>
>> Thanks!
>> kant
>>
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