scala - Link promise to another -

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i'm reading scala.concurrent.impl.promise , confused concept "link defaultpromise another". understand 'prevent memory leak' part, don't know how write example current state of defaultpromise defaultpromise.

when defaultpromise first created, state nil , list grows keep appending flatmap it. under circumstances branch 

case dp: defaultpromise[_] => dp.asinstanceof[defaultpromise[s]].linkrootof(p)

in future.flatmap called?

  test("default promise linking") {     //f1.getstate === nil     val f1 = future {thread.sleep(200000); 2}      //f1.getstate === list(callbackrunner1)     f1.flatmap(x => future {thread.sleep(200000); 4})     //f1.getstate === list(callbackrunner2, callbackrunner1)     f1.flatmap(y => future {thread.sleep(200000); 3})      thread.sleep(30000000)   }

take example:

val f1 = future {thread.sleep(200000); 2} val f2 = f1.flatmap(x => {     val f3 = future {thread.sleep(200000); 4}     f3 })

f1 , f3 of course not share same state - 1 resolves 2 other 4. when f1 completes, handler (f(v)) create f3 , match the case confused about. then, f2 (p in flatmap) linked f3 share same state.


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