JahanAjani / CacheAsService

Espressif Systems coding assignment.

CacheAsService

Current implementation supports LRU cache type only And String types only, but can be easily extended.

To add new cache type implement cache interface.

To start cache as a service follow below steps:

• Go to cache/framework/rest/ and run StartApplication.java.
• This will start spring boot application at default port 8080.
• Go to browser/postman all apis are hosted at localhost:8080

Currently 5 APIs are supported:

For easy usage you can copy local cache as a service apis.postman_collection.json and open it in postman to use below apis.

Cache index url: localhost:8080/cache/

Auth api to get valid unique auth-token for user:

- API: GET `/v1/auth?custID=<Integer customer ID>`
- Customer ID is current hardcoded so, pass ID from range [1001-1003].
- Returns: unique token for custID.
- example: GET localhost:8080/cache/v1/auth?custID=1001

Create cache for a customer:

- API: POST `/v1/{custID}/cache`
- Body params:
	- "token":<token got from auth api>
	- "size":<cache max size>
	- "cacheType": lru --currently only lru cache is supported.
- returns: unique CacheID.
- Example: localhost:8080/cache/v1/1001/cache
			body:{\n\t\"token\":\"abc24b\",\n\t\"size\":5,\n\t\"cacheType\":\"lru\"\n}"

To put value in cache:

- API: POST `/v1/{custID}/cache/{cacheID}/put`
- body params:
	- "token": user token
	- "key": key
	- "value": value
- Returns: success or failure.
- Example: POST localhost:8080/cache/v1/1001/cache/1/put
			 body:{\n\t\"token\":\"abc24b\",\n\t\"key\":\"snapshot1\",\n\t\"value\":\"version2\"\n}

To retrieve value from cache:

- API: GET `/v1/{custID}/cache/{cacheID}/get?key=<key>&token=<token>`
- example: localhost:8080/cache/v1/1001/cache/1/get?key=snapshot1&token=abc24b
- Returns: input key and value. If value is not present it return null.

Steps to use cache as a library:

• cache.framework.core contains all core cache logic.
• To use it as library either copy or add dependency in your project of this package.

To test functionality of core cache library please run CacheFactoryTest.java & LRUCacheTest.java placed under /CacheAsService/src/test/java/cache/framework/core