Distributed Systems Programming using scala

a programming language called Scala, which is supported by Java and

allows distributed programming applications to be seamlessly developed in Java/Scala without the

concern of how to implement threads and multithreading. Any threading requirements are automatically

managed by the Scala architecture. In each of the three weeks a practical class will explore example usage

of Scala and three exercises will be set that require you to extend the development of those practical


Exercise 1: A distributed calculation of Pi

Modify the Pi example described in class to:

a) display the message “I received part of the result!”, followed by the total number of results

received to far, each time a worker returns its result to the master.

b) have every Worker display the time it has taken to calculate its portion of the end Pi result.

Exercise 2: Optimising distributed data management

Extend the Remote example to:

a) include a “Track” case in the “active” method of the “Sender” class. This new case would be

responsible with keeping track (count) of how many times the status was printed to screen and it

should be used in the “c @ Continue” case of the same “active” method (within the first “if”

statement of the “c @ Continue” case). The “Done” case of the same “active” method should also

use this new counter when displaying the summary.

b) use an array ('Map') instead of 4 single 'val' items (remotePath, totalMessages, burstSize,

payloadSize) for keeping track of and accessing the Sender settings. (Note: There are several

locations within the code which need altering, search carefully.)

Exercise 3: Extending distributed object functionality

Modify the Supervision example by adding two more cases to the “Child” class' “receive” method. The

two cases should:

a) store the values of two arbitrary strings (“str1”, “str2”) within the “Child” class.

b) calculate and print the Sum of the lengths of the two strings. (Note: Look at how the “state”

variable is used.)

c) make the “child” object crash through an exception triggered by one of the two new methods by

following the pattern present within the “CommenceOperations” case of the “receive” method of

the “Supervisor” class. (Note: Look at Exception handling when the data types of the parameters

and arguments are incompatible.)

Kemahiran: Java, Skala

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