Add a Reactive ScriptTemplateView [SPR-15063]

[spring-projects-issues]

Sébastien Deleuze opened SPR-15063 and commented

JSR 223 support would make sense for Reactive application. See https://github.com/sdeleuze/kotlin-script-templating for an interesting use case with Kotlin.

One open question to be solved is how can we deal with ScriptEngine that are not thread safe. In Spring MVC we use a sharedEngine boolean property + ThreadLocal, in reactive world we will need to find another solution if we want to support this, like a ScriptEngine pool or just getting a new ScriptEngine for each request.

---

Referenced from: commits b503e46

[spring-projects-issues]

Sébastien Deleuze commented

Resolved by this commit. For now when sharedEngine is set to false we create a new ScriptEngine instance for each request. That could be later improved by a ScriptEngine instance pool if necessary.