GenSpoxy

the GenSpoxy package consist of battle-tested abstractions that help creating in-memory caching

Advantages of GenSpoxy:

1. Makes it very easy to create from scratch highly-concurrent applicative reverse-proxy that hold an internal short-lived (configurable) memory cache.
2. CDN like Origin Shielding - when multiple clients ask for the same request and experience a cache miss, the calculation will be done only once
3. Supports non-blocking mode for requests that are willing to receive stale cached data
4. Eases the time-to-market of features that require some caching

notes:

1. The default cache storage used is ETS
2. The default behaviour is non-blocking
3. Each request should be transformed to a singature deterministically (a.k.a. req_key)

usage example:

defmodule SampleCache do
  use GenSpoxy.Cache, prerender_module: SamplePrerender
end

defmodule SamplePrerender do
  use GenSpoxy.Prerender

  @impl true
  def do_req(req) do
    # slow calculation of `req`
  end

  @impl true
  def calc_req_key(req) do
    Enum.join(req, "-")
  end
end

# usage
req = ["fetch data", "https://www.very-slow-server.com"]
SampleCach.get_or_fetch(req)  # blocking manner

SampleCach.async_get_or_fetch(req)  # async manner (we're OK with accepting stale response)