Convert a Java Future to a Scala Future -

i have java future object convert scala future. looking @ j.u.c.future api, there nothing use other isdone method. isdone method blocking?

currently have in mind:

val p = promise() if(javafuture.isdone())   p.success(javafuture.get) 

is there better way this?

how wrapping (i'm assuming there's implicit executioncontext here):

val scalafuture = future {     javafuture.get } 

edit:

a simple polling strategy (java.util.future => f):

def pollforresult[t](f: f[t]): future[t] = future {     thread.sleep(500)     f   }.flatmap(f => if (f.isdone) future { f.get } else pollforresult(f)) 

this check if java future done every 500ms. total blocking time same above (rounded nearest 500ms) solution allow other tasks interleaved in same thread of executioncontext.