CODEWITHSUNDEEP
javascala
paul
paul

Reputation: 13471

Serialize/De-serialize Scala future

Is it possible serialize a Scala Future into byte[] and then deserialize it again?.

And if is possible, does someone know the best approach?

Upvotes: 0

Views: 439

Answers (2)

Florian Kirmaier
Florian Kirmaier

Reputation: 582

That shouldn't be possible with the standard-implementation of Futures in scala. Future clearly doesn't implement the interface Serializable and isn't supposed to be serialized.

The question is, what would happen when the Future isn't finished yet. The Future gets executed because it's task is scheduled in the ExecutionContext. If one would serialize this Future and deserialize it on another JVM, then the task would only be scheduled on the first JVM. On the second JVM, the future would never get its result.

It probably makes more sense to serialize the content of a Future, as soon as it is ready.

Upvotes: 1

Andrey Tyukin
Andrey Tyukin

Reputation: 44937

import concurrent.ExecutionContext.Implicits._
println(if ((concurrent.Future{}).isInstanceOf[Serializable]) "Yes" else "No")

prints

No

Upvotes: 1

Related Questions