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Wish List: Java Object Replacement

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Wish List: Java Object Replacement

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Take 60 minutes to understand the Power of the Actor Model with "Designing Reactive Systems: The Role Of Actors In Distributed Architecture". Brought to you in partnership with Lightbend.

I wish I could replace an object with another of the same type and the myriad references existing to the first one would automatically be redirected.

Obj o1 = new Obj("Red");
map.put("Ball", o1);
ball = o1;
Obj o2 = new Obj("Blue");


map.get("Ball") should return the blue ball.
list should contain blue ball.
ball == o2 should evaluate to true.

We can work around the situation by extra code in Obj using composition and method call redirection. Wouldn’t live be simpler if the support is native?

The security part could be controlled by providing a markable interface or annotation.

Real life examples? Substituting a player. Corporate mergers. Two pools joining to make a bigger pool.

From http://www.aloshbennett.in/weblog/2010/java/wish-list-java-object-replacement/

Learn how the Actor model provides a simple but powerful way to design and implement reactive applications that can distribute work across clusters of cores and servers. Brought to you in partnership with Lightbend.


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