homework

• Insert/append set of long values to pool by id
• Query values quantile by pool id

Configuration

name	type	default	description
persistence.enable	boolean	false	If true, all 'add' operation will be write to persistence file. Application will try to recover pool values via this file.

Commands

Start project:

$ ./mvnw spring-boot:run

API

Add values to pool

• URL: /add
• Method: POST
• Content-Type: application/json
• Request body:

name	type	default	description
pooId	long		0<poolId<99999 and not null
values	long[]		0<array_item<99999 and not null

• Response body:

name	type	default	description
action	string		INSERTED when poolId is not exists otherwise APPENDED

Sample request:

$ curl --location --request POST 'localhost:8080/add' \
--header 'Content-Type: application/json' \
--data-raw '{
    "poolId": 2, 
    "values": [3, 6, 7, 8, 8, 10, 13, 15, 16, 20]
}'

Sample response:

{"action": "INSERTED"}

Query pool

URL: /query Method: POST Content-Type: application/json

Request body:

name	type	default	description
pooId	long		0<poolId<99999 and not null
percentile	float		not null

Response body:

name	type	default	description
count	long		INSERTED when poolId is not exists otherwise APPENDED
result	long		quantile value on input percentile

Sample request:

$ curl --location --request POST 'localhost:8080/query' \
--header 'Content-Type: application/json' \
--data-raw '{
    "poolId": 2,
    "percentile": 50
}'

Sample response:

{"count":10,"result":9}