I want to write my own very basic caching inside my sparkjava server.
My thought is to cache the response somewhere, and have some code in a before block that checks if the incoming path is one that should return the cached string/response or should carry on to the appropriate path and calculate the response (storing it in the cache for future calls).
My question is, if i understand sparkjava properly, is how can i return the response from inside the before block and not carry on into the path
Or maybe it's not possible?
Alternatively, i can check inside every path at the beginning of each, to either use the cached response or create a fresh one, but writing this in every path block instead of writing it once in a before feels wrong/is needlessly duplicating.
I think you can return any string data in a halt() statement during your before-filter. This approach is outlined in the Spark documentation located at: http://sparkjava.com/documentation#halting.
Example:
before( (req, res) -> {
// somehow prove the request matches a request that was previously cached
if(req.contextPath() == known_cached_path){
halt(304, cached_data);
}
});