NET guy making his way into the Scala world makes a lot of sense Further Reading The system can be adapted to alternative implementations of the Future pattern. futures are immutable by nature and are cached internally, once a value or exception is assigned, futures cannot be. This trivial example creates a Future.Ĭopy Code import ncurrent. 2- callbacks for onComplete (Success/Failure) i,e- values in future are instances of Try clause, 3- map multiple future’s. Note that Future is a type which denotes future objects, whereas future is a method which creates and schedules an asynchronous computation, and then returns a future object which will be completed with the result of that computation. The result becomes available once the future completes. The simplest way to create a future object is to invoke the future method which starts an asynchronous computation and returns a future holding the result of that computation. Once a Future object is given a value or an exception, it becomes in effect immutable– it can never be overwritten. When a Future is completed with an exception thrown by the computation, we say that the Future was failed with that exception.Ī Future has an important property that it may only be assigned once.When a Future is completed with a value, we say that the future was successfully completed with that value.The solution to this problem is to use akka after pattern which is a non-blocking approach to provide timeout to future. If the computation has completed with a value or with an exception, we say that the Future is completed. This case can occur in situations where we might want to ping a database service but do not want to wait forever to receive the result of ping.
#Scala future driver#
If the computation has not yet completed, we say that the Future is not completed. The standard java zookeeper driver supports blocking operations with an optional support for callback style async operations.
This value is usually the result of some other computation: As a result, the users of future.
Also, there is no isComplete method in our futures. I’ll add more Scala Future examples here as time goes on, but for now I’ll just say that if you want more information, I describe this more in the Scala. It’s a callback method, and in this case it’s called whenever the Future completes. Instead, future.scala evaluate lazily, and they do the same job every time you invoke onComplete. One of the secrets of this example is the onComplete method. FuturesĪ Future is an object holding a value which may become available at some point. future.scala are pure functional, thus they will never store result values or exceptions.
#Scala future how to#
We will just spend a bit of time looking at some of the plumbing of how to create and work with Futures (Scalas Task equivalent). In Scala this would be done by the use of the / which we will see more of later.
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