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Solvians Java Case Study

Introduction – Feed Generator

Our core business is to create financial websites for some of the top-tier financial institutions in the world. Those pages display information about financial products or so-called “certificates”, sourcing from numerous data feeds in our back-end system.

Certificate updates of data feed are the most important element in our applications. A certificate update has the following properties:

  • Timestamp (number of milliseconds since January 1, 1970, 00:00:00 GMT)
  • ISIN (string, 2 random uppercase alphabets + 9 random alphanumeric characters + 1 check digit)
  • Bid Price (random number, 2 decimal places, range between 100.00 and 200.00 inclusive)
  • Bid Size (random number, 0 decimal place, range between 1,000 and 5,000 inclusive)
  • Ask Price (random number, 2 decimal places, range between 100.00 and 200.00 inclusive)
  • Ask Size (random number, 0 decimal place, range between 1,000 and 10,000 inclusive)
  • ISIN check digit calculation:

To calculate the check digit, the following steps should be followed:

  1. Convert any letters to numbers by the conversion table below, e.g. “DE123456789” will be converted to “13 14 1 2 3 4 5 6 7 8 9”
  2. Starting from the rightmost digit, every other digit is multiplied by two. In the example, we will have “2 3 2 4 2 2 6 4 10 6 14 8 18”.
  3. Add up the resulting string of digits (numbers greater than 9 becoming two separate digits). In the example, we will have 2+3+2+4+2+2+6+4+1+0+6+1+4+8+1+8 = 54.
  4. Subtract the sum from the smallest multiple of 10 which is greater than or equal to it, in the example we will have 60 – 54 = 6.

Conversion table for characters is:

A = 10	F = 15	K = 20	P = 25	U = 30	Z = 35
B = 11	G = 16	L = 21	Q = 26	V = 31	
C = 12	H = 17	M = 22	R = 27	W = 32	
D = 13	I = 18	N = 23	S = 28	X = 33	
E = 14	J = 19	O = 24	T = 29	Y = 34

Implementation – Feed Generator

  • Write an ISIN Generator class with Unit tests to generate the ISIN string. This is the most central part of the case study.

  • Write a Callable class with Unit test to generate one line of certificate update, in which the described properties are comma separated (thousand-separator is not needed): 1352122280502,DE1234567896,101.23,1000,103.45,1000

  • Generating random numbers is not important in this implementation, you can write a very simple generator or use the following sample:

        ThreadLocalRandom random = ThreadLocalRandom.current();
  • Use the App main class to
    • Take 2 parameters: (a) Number of threads, and (b) Number of certificate updates, (this is already implemented and tested, but feel free to improve it and fix any issues)
    • According to the parameters, trigger the certificate generations in multiple threads, and
    • Finally, collect and print the lines of generated certificate updates

We will run our own tests on your code so bear that in mind when designing classes