How to serialize/deserialize IgniteConfiguration to/from JSON

[juanavelez <js...@gmail.com>]

Is there a way to easily serialize/deserialize an IgniteConfiguration object
to/from JSON?

The IgniteConfiguration class makes use of several interfaces for properties
as well as for keys which makes it very difficult to serialize/deserialize
to/from JSON without having to resort to annotate the source code (which I
can only guess the main developers would not want to).

Any advice or samples from someone who has already done it, would be greatly
appreciated

PS: Yes, I know that I could use the Spring module for configuration but I
am trying to stay away from having to use Spring, which I might not be able
to avoid it after all.

Thanks - Juan



--
View this message in context: http://apache-ignite-users.70518.x6.nabble.com/How-to-serialize-deserialize-IgniteConfiguration-to-from-JSON-tp2164.html
Sent from the Apache Ignite Users mailing list archive at Nabble.com.

Re: How to serialize/deserialize IgniteConfiguration to/from JSON

[juanavelez <js...@gmail.com>]

Created Issue https://issues.apache.org/jira/browse/IGNITE-2112



--
View this message in context: http://apache-ignite-users.70518.x6.nabble.com/How-to-serialize-deserialize-IgniteConfiguration-to-from-JSON-tp2164p2177.html
Sent from the Apache Ignite Users mailing list archive at Nabble.com.

Re: How to serialize/deserialize IgniteConfiguration to/from JSON

[Juan Velez <js...@gmail.com>]

Hello Val,

Thank you for your prompt reply. 

After responding to another issue you replied (Help with Integrating Ignite… with JBoss…) I don’t know how easy would be to describe an IgniteConfiguration object as a JSON string. As you mentioned in that reply, there are many factories, SPIs, etc. that are properties themselves.

I think the main reason for having a JSON configuration of Ignite would be to avoid the use of Spring for configuration but seeing how the IgniteConfiguration class (and its dependents) don’t really follow a JavaBean approach, I don’t think it would be a good candidate for JSON deserialization.

One of the issues (and I think in this case you have no control over it) I ran into was that CacheConfiguration extends MutableConfiguration (from JCache) and MutableConfiguration’s expiryPolicyFactory is set at construction time to EternalExpiryPolicy.factoryOf() which itself returns a FactoryBuilder.SingletonFactory that does not have a default constructor. 

Another issue was with the DiscoverySpi configuration whose concrete implementation class TcpDiscoverySpi has many getter methods that when called raise an NPE (e.g. getRemoteNodes() ) and the reason for this, is that a TcpDiscoverySpi is not really ready until its spiStart method is called, which a JSON Serializer would not know about that.

Having said all this, I am going to open a ticket to request that Ignite itself provides some utility class/method that returns an IgniteConfiguration from a JSON string and generates a JSON from an IgniteConfiguration. It would be left to the implementors of the feature to determine how to specify the JSON string for deserialization and/or other restrictions/constraints/pre-requisites necessary for it to work correctly.

Thanks - Juan

> On Dec 7, 2015, at 1:20 PM, vkulichenko <va...@gmail.com> wrote:
> 
> Juan,
> 
> Currently there is no support for this, but I believe it can be added. Would
> you mind to create a ticket and share your thoughts on how this feature
> should look like?
> 
> -Val
> 
> 
> 
> --
> View this message in context: http://apache-ignite-users.70518.x6.nabble.com/How-to-serialize-deserialize-IgniteConfiguration-to-from-JSON-tp2164p2167.html
> Sent from the Apache Ignite Users mailing list archive at Nabble.com.

Re: How to serialize/deserialize IgniteConfiguration to/from JSON

[vkulichenko <va...@gmail.com>]

Juan,

Currently there is no support for this, but I believe it can be added. Would
you mind to create a ticket and share your thoughts on how this feature
should look like?

-Val



--
View this message in context: http://apache-ignite-users.70518.x6.nabble.com/How-to-serialize-deserialize-IgniteConfiguration-to-from-JSON-tp2164p2167.html
Sent from the Apache Ignite Users mailing list archive at Nabble.com.