title Extension Init & Reading data from cache 

Extension->Lambda: Read "config.yaml" from "/var/task" to get \nthe list of items that needs to be cached
Extension->Parameter Store: Initialize cache map and fetch all \nparameters listed in config.yaml if \nCACHE_EXTENSION_INIT_STARTUP=true
Extension-->Extension: Initialization complete
Extension->DynamoDB: Initialize cache map and fetch all \nrecords listed in config.yaml if \n CACHE_EXTENSION_INIT_STARTUP=true
Extension-->Extension: Initialization complete
Extension-->Extension: Start a HTTP server
Lambda->Extension: HTTP Get:/parameters?name=<name> to read from parameters cache
Extension-->Lambda: Check whether item exists in cache and not exired?\nIf yes return it or \nread it from parameter store, cache it and return it
Lambda->Extension: HTTP Get:/dynamodb?name=<table><hyphen><hashkey><hyphen><rangekey> \nto read from dynamodb cache
Extension-->Lambda: Check whether item exists in cache and not exired?\nIf yes return it or \nread it from Dynamodb, cache it and return it as JSON string