Scala Programming improves the need for programming which is useful just as general purposed. It generally helps to program-related with static kind. This program generally runs on JVM or in a virtual machine in Java. It implies aggregation happens in the byte code of Java. One progressively significant component that has made Scala programming impeccable is object situated language. It goes under the OOPs language.
Despite the fact that this has the element to execute in JVM, yet various highlights in this OOPs language is totally not the same as Java as —
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Exercise 1: Multi-threaded calculation of Pi Extend Exercise 1 as follows: Every time the Master actor receives a result from one of the Worker actors, either print the message “Odd Turn!” or “Even Turn!” in an alternating manner. For example, the first result should trigger the message “Odd Turn!”, the second should trigger “Even Turn!”, the third “Odd Turn!”, etc. Have every Worker actor display its unique worker identifier at the start of its Pi calculation contribution. E.g.: “Workerstarting work…”. Exercise 2: Distributed Network Communication Extend Exercise 2 as follows: Add a new case to the Receiver actor that accepts a string parameter and prints that message to console/log. This new case should be called within the Echo case, with the Echo message (“m”) as its argument.Modify the Receiver actor to keep track of how many messages it receives through the Echo case. This number should be printed to console/log when the Shutdown command comes in. Exercise 3: Process/Actor Management Hierarchy Extend Exercise 3 as follows: Create a new actor called Abacus with one case that accepts two integer parameters and prints to console/log their sum. If either parameter value is 0, trigger an Exception using the “throw” syntax. Assign management responsibility over the Abacus actor to the Child actor in a similar manner to how the Supervisor actor is responsible for the child actor. This should take place within the “preStart()” method of the Child actor. Test the Abacus actor’s case within the “preStart()” method of the Child actor.
Note: IF the project was created on another PC, the Akka libraries path will be different. As such, first select all existing Akka libraries (Click the first one, scroll to the bottom and SHIFT+Click the last one that has a red exclamation mark) and hit the Remove button found on the right-hand side in the lower part of the button group.
Note: At this stage, all errors found within the code should disappear, perhaps after a few seconds once the IDE has had a chance to interrogate the new JAR files that were just associated with this project.
Note: The algorithm this program is employing in order to calculate the value of Pi is the Leibniz formula, which is a sum of fractions - this is implemented within the calculatePiFor method of the Worker class found within the Pi object. The starting point of the program is where the calculate() method is being called with some parameters, at the very top of the Pi object.
Akka Remoting:
Note: This is a Scala IDE (Eclipse) project that has been exported from my machine. As such, the akka.remoting.zip file found on the VLE does not need to be extracted, Scala IDE can import it straight away.
Note: At this point, the new akka_remoting project should have been successfully imported by Scala IDE and should be listed on the left-hand side.
Note: This program illustrates how two Scala Actors can easily communicate between themselves through HTTP messages. The message they send to one another are all defined within the Sender.scala file as case class or case object definitions within the Sender object and used further down in the def active(…) method found in the Sender class. The actor reference found throughout this method is referring to an instance of the Receiver. So, in essence, the Sender is talking to itself - it’s sending commands (the case class or case object part of the code) that it wants to execute over to the Receiver, at which point the Receiver echoes them back to the Sender exactly as they were originally sent, which finally makes the Sender execute them.
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