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From Valentin Kulichenko <valentin.kuliche...@gmail.com>
Subject Re: Configuring Cassandra persistence from code
Date Tue, 17 Jan 2017 23:25:06 GMT

I'm not against existing functionality and definitely do not propose to rip
and replace it. However, while Spring is not required, it's used in vast
majority of cases to configure Ignite.

Having said that, I think this an important usability improvement. Here is
the ticket: https://issues.apache.org/jira/browse/IGNITE-4555


On Sun, Jan 15, 2017 at 7:40 PM, Igor Rudyak <irudyak@gmail.com> wrote:

> Hi Val,
> The main reason why Spring wasn't utilized, is to support Ignite-Cassandra
> integration without using Spring. As you know, Spring is not required
> component to run Ignite. Thus the main idea to avoid Spring was to provide
> Cassandra integration for Spring-less Ignite environments.
> Igor
> On Fri, Jan 13, 2017 at 11:37 AM, Valentin Kulichenko <
> valentin.kulichenko@gmail.com> wrote:
>> Hi Igor,
>> Why did you choose to use a special format instead of going with Spring
>> in the first place? It seems to that this is what creating difficulties
>> here, because with Spring any of scenarios we mentioned is possible:
>>    - You can create a template in XML, load it using
>>    Ignition.loadSpringBean() and modify in code.
>>    - You can provide full configuration in the same file where Ignite
>>    configuration is.
>>    - You can configure everything in code if you don't like XML.
>> Current approach seems to introduce too many limitations to be usable. Do
>> you have any objections against making KeyValuePersistenceSettings class
>> Spring compatible? If not, I will create a ticket. Or maybe you have other
>> suggestions on how to improve flexibility here?
>> -Val
>> On Thu, Jan 12, 2017 at 6:09 PM, Igor Rudyak <irudyak@gmail.com> wrote:
>>> Good question. The main case for this getters/setters API is when you
>>> are going to dynamically create Cassandra persistence configuration for you
>>> cache.
>>> As I see it, in most cases developers will create kind of xml persistent
>>> descriptor template, which will be used to generate final persistence
>>> descriptor for particular cache or just reuse already existing persistence
>>> descriptor. In case you want to generate persistence descritor dynamically
>>> from scratch I don't see much difference from doing it using
>>> getters/setters API or generating XML document - in both cases it will be
>>> lot's of XML API or Persistence Descriptor API calls.
>>> Any thoughts?
>>> On Jan 12, 2017 3:36 PM, "Valentin Kulichenko" <
>>> valentin.kulichenko@gmail.com> wrote:
>>>> Hi Igor,
>>>> I just noticed that KeyValuePersistenceSettings class required to
>>>> configure Cassandra store can be created only based on XML file of a
>>>> special format.
>>>> If so, this looks like a pretty serious limitation. First of all, when
>>>> configuring such cache, user has to know both Spring configuration format
>>>> and this specific format for persistence. In other words, persistence
>>>> configuration seems to be weirdly separated from all other configurations
>>>> in a separate file with a different format.
>>>> But most importantly, what if user wants to create a cache dynamically
>>>> and doesn't know configuration in advance? How are they supposed to create
>>>> this special XML in this case?
>>>> Is my understanding correct? If so, I think we should add standard
>>>> getters and setters to KeyValuePersistenceSettings. This will make it
>>>> compatible with Spring and will allow to create it dynamically in code.
>>>> Agree?
>>>> -Val

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