What happens to a Settable Future object once the setException method is called on it?

Question

I have a Settable Future object "temp" which has a context set to it. Also temp.addListener(new Runnable{...}) method is called, basically registering a listener to it. However eventually if any exception comes up then temp.setException() is called. If the setException is called will the listener be de-registered or will the context be cleared (basically will the Settable Future object be damaged after exception is set)?

The flow of code is something like this :-

1. temp.setContext({temp.set(//some value is set if everything goes right) || temp.setException(//set exception if something comes up)});

2. temp.addListener(new Runnable{ run(){temp.get()}})

Answer 1

When you call setException() , the ListenableFuture will run its listener . If you want to write code that will not be run in that case, you can use Futures.addCallback instead of addListener . ( addCallback lets you specify code to be run only in case of success or only in case of failure.)

As for what happens with the context: The context isn't part of the ListenableFuture API. I don't know if it was added by you or another library. You'd have to consult that class to find out how it behaves.