getOrPut
Return
Value associated with key, obtaining the value from valueProducer if necessary. No observable state associated with this cache is modified until loading completes.
Parameters
valueProducer
Must not return null. It may either return a non-null value or throw an exception.
Throws
ExecutionExeption
If a checked exception was thrown while loading the value.
UncheckedExecutionException
If an unchecked exception was thrown while loading the value.
ExecutionError
If an error was thrown while loading the value.