ConcurrencyAndLockOnLoggerClient

Implementation of Logger Client have below 3 methods --->

1. Start a processId for given timestamp---- void start(String processId, long timeStamp);
2. End a processId for given timestamp --- void end(String processId, long timestamp);
3. Poll mechanism to fetch latest message ---- String poll();

Output --->

1. {3} process started at {7} and ended {15}
2. {2} process started at {8} and ended {12}
3. {1} process started at {12} and ended {15}