Program Structure : Files were divided into 3 sections: 1- Domain Model : Including interfaces in com.powa.detector package. 2- Implementation: Including implementation of domain model in com.powa.detector.impl package. 3- Test: Two different complete test cases in com.powa.detector.test

How Log being stored: 1- Ip string being converted to 32-bits Long for minimizing memory consumption. 2- Only Last 5 failed login epochs stored in a ring buffer. 3- A ConcurrentHashMap of (ip 32-bits long value as a key) and (ringbuffer of Epochs as a value) will be stored.