erlang_cache

erlang_cache

This example illustrates how to use Nebulex from an Erlang app using the rebar3_elixir_compile plugin.

First, we have to configure the rebar.config based on the rebar3_elixir_compile plugin.

Then, we have defined the Nebulex cache in a separated Elixir project, in order it can be compiled correctly. This Elixir project must be under elixir_libs directory (see the rebar3_elixir_compile plugin), and because most of the Nebulex options are needed in compile-time, we also need to configure the cache in the Elixir config file.

Besides, it is needed to configure the cache in our Erlang app config file and setup the cache as a supervisor within our application's supervision tree; see the erlang_cache_sup module.

And finally, thanks to the rebar3_elixir_compile plugin we are able to use the NbxCache from our Erlang all; see the test example.

Getting started

First, let's compile our Erlang app:

$ rebar3 compile

Then we can run our app:

$ rebar3 shell --config config/sys.config

Now we are ready to use NbxCache from out Erlang app, let's run a simple test example:

1> erlang_cache:run_test().
Testing or 'NbxCache' ...

#==> 'Elixir.NbxCache':get(my_key) -> nil
#==> 'Elixir.NbxCache':set(my_key, hello) -> hello
#==> 'Elixir.NbxCache':get(my_key) -> hello
#==> 'Elixir.NbxCache':delete(my_key) -> my_key
#==> 'Elixir.NbxCache':get(my_key) -> nil

#==> STATS:
[{delete,1},{get_miss_count,2},{get,1},{set,1}]
ok

You can also call the NbxCache directly:

2> 'Elixir.NbxCache':get("foo").
nil
3> 'Elixir.NbxCache':set("foo", "bar").
"bar"
4> 'Elixir.NbxCache':get("foo").
"bar"
5> 'Elixir.Nebulex.Cache.Stats':get_counters('Elixir.NbxCache').
[{delete,1},{get_miss_count,3},{get,2},{set,2}]

It is pretty easy!

BTW, you should run the observer in order to see how the Nebulex runs as part of the Erlang application's supervision tree:

6> observer:start().