Autoconfiguration support for Hazelcast clients

[neilstevenson]

org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration.java currently only provides support for Hazelcast server instances.

This could be extended to support Hazelcast client instances.

Hazelcast servers are configured if a com.hazelcast.core.Config
Hazelcast clients can be configured with a com.hazelcast.client.config.ClientConfig

[snicoll]

This could be extended to support Hazelcast client instances.

Use cases please? I'd rather not add anything unless I have a clear picture of what you would do with this. Thanks.

[neilstevenson]

See http://docs.hazelcast.org/docs/latest-dev/manual/html/hazelcasttopology.html, for an outline of Hazelcast deployment topologies.

Is that sufficient justification or do you need more information ?

The key part here is that the Hazelcast Java client could be mostly Spring Boot enabled, but since it is instantiated using com.hazelcast.client.config.ClientConfig (and this isn't an instance of com.hazelcast.core.Config) it wouldn't be autoconfigured.

[snicoll]

More or less: this is still very vague. I understand that you would define a bean of type ClientConfig and we would detect that. If you have a more precise idea, it would be nice to be more specific. A PR is also welcome.

[gAmUssA]

@snicoll since there is no distinction between

Hazelcastinstalce hzInstance = Hazelcast.newHazelcastinstance()

and

HazelcastInstance hzInstance = HazelcastClient.newHazelcastClientInstance()

from the API standpoint, for example, https://github.com/hazelcast/hazelcast-code-samples/blob/master/hazelcast-integration/springboot-caching/src/main/java/com/hazelcast/springboot/caching/BootifulClient.java#L82, following conditions might can be taken into consideration:

• existence of HazelcastClient class in the classpath
• A ClientConfig bean is defined.
• A hazelcast-client.xml is in classpath

What do you think?

[snicoll]

I guess I like that. I still need to figure out which takes precedence (probably the server)