Word counter

Building and running

Building and running the application requires Java 8+ and sbt.

Build & run with:

sbt "run [--timeWindow <duration>] [--httpPort <port>] <executable file path>"

timeWindow and httpPort options are optional. Default timeWindow is 15seconds. Default httpPort is 80.

Example:

sbt "run --timeWindow 15seconds --httpPort 80 blackbox/blackbox.win.exe"

Getting current word counts:

curl -s http://localhost:<httpPort>/wordCount

Example:

curl -s http://localhost:80/wordCount
{"wordCountByEventType":{"baz":2,"foo":2,"bar":5}}

The implementation relies on the following assumptions:

Any string of one or more non-whitespace characters is considered a "word"
Only characters matching the [ \t\n\x0B\f\r] regex are considered whitespace characters
Only words in the data field of the JSON are counted.
The clock of the blackbox is in sync with the clock of the application
The blackbox executable delivers events in order (that is for any events A and B where B is printed after A, the timestamps of B >= the timestamp of A)
The blackbox doesn't crash ;)