How to run

1. docker-compose up --build
2. curl -X POST http://127.0.0.1:3000/events\?event\=evt1
3. docker-compose exec web rspec # tests

Notes:

• If we dont receive requests on /events during 1 minute, next request immediately triggers batch to external service
• In consumer#handle_iteration we might use llen before, then lrange. But have a look at benchmark docker-compose exec web rake benchmark:llen_vs_lrange.

               user     system      total        real
lrange:    0.000000   0.000000   0.000000 (  0.000278)
llen:      0.000000   0.000000   0.000000 (  0.000262)

• Request limitations!!! 8 CPU, 16 memory: 1000 requests per 1.5sec (100 batch requests/1.5sec). Looks like we might handle 1000 requests/sec, if we vertically scale CPU and memory. rake benchmark:handle_iteration

*** consumer#handle_iteration ***
Handled 1000 requests
1.527002s

• Before production we have to replace inline queue adapter with sidekiq/resque
• This solution does not support to scale the consumer as is. But we might use other redis keys.