[Java] Add specialized serializers for Groovy

[azhsmesos]

Hello! Recently I have read the configuration center in groovy and so on, so I have a certain understanding of groovy, can I try this issue, but before I ask what information is available to learn how to add serializers for other languages, thanks!

[chaokunyang]

Hi @azhsmesos, thank you for your willingness to contribute to Fury. Fury supports JVM classes serialization best if they don't custom serialization by JDK serialization method such as writeReplace/writeObject/readResolve/readObject/readObjectNoData/writeExternal/readExternal. The main work for optimizing groovy serialization are:

• find common groovy collections/containers/classes which needed to be serialized. Many groovy collections are collections in java.util.*, those collections are supported by fury already, you can just skip it.
• implement io.fury.serializer.Serializer for those classes in fury
• add a switch to register those serializers in fury

[chaokunyang]

For example, scala object is singleton, which defined writeReplace method, it return a scala.runtime.ModuleSerializationProxy for serialization. We should check whether groovy has similar behhaviour:

object Foo {
}

See more in #764

[azhsmesos]

Do we have a corresponding community similar to wechat group? I want to go in to facilitate communication.

[chaokunyang]

Yes, we do. You can follow our wechat offical acount https://github.com/alipay/fury#getting-involved for joinning the group