Akka Concurrency by Derek Wyatt, Roland, Dr. Kuhn

By Derek Wyatt, Roland, Dr. Kuhn

Writing really concurrent software program at the Java digital laptop simply bought a lot more straightforward. The Akka Toolkit takes the edge out of coding for a number of cores, a number of processors, or even a number of machines. Akka Concurrency will convey you what it ability to layout and write software program within the paradigm of Akka. you are going to the right way to take into consideration your software program in new and intriguing ways in which will let you convey your designs evidently, permitting you to target the enterprise of your software program greater than at the concurrency of it. This publication choices up the place the Akka documentation leaves off, exploring the how and the why of Akka, in a fashion that would empower you to develop your functions to new degrees of scalability, responsiveness, and function.

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3 Chapter 2 · Concurrency and Parallelism When you break out of that mindset, and put the immutable data outside of an object context, then we find that the data gets passed around much more to short-lived functions. A function takes the data, transforms it, and then passes it off to someone else, who possibly transforms it again and returns it to the caller, who returns it to his or her caller, and so on. When the program behaves like this, then we can immediately see how functions can run concurrently.

How much does it cost then? Well, that’s an interesting question and it depends largely on how your application is designed and how it’s working with the data, so we need to speculate just a tad. If you have one global mutable map and everyone’s got a reference to it, then the cost of modifying that might be very high. Why? 6 Everyone who wants to have a look at that map is going to have to wait while the guy who wants to modify that map makes his modification. That means that threads are tied up, which is costly.

However, since the non-quantifiable cost of waiting threads in any given situation can actually be quite significant, I think we can at least argue that the immutable map can be superior in a concurrent situation. Download from Wow! com> But that’s not equivalent! OK, so it’s not exactly an apples-to-apples comparison. The mutable version had the virtue that everyone could see the modification. Well, assuming that that’s what you want (and it’s not a given that it is what you want) then we do have a bit of a problem.

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