Process Store

A simple library to store and retrieve data from the process tree.

Installation

The package is available in Hex, and can be installed by adding process_store to your list of dependencies in mix.exs:

def deps do
  [
    {:process_store, "~> 0.2.0"}
  ]
end

Usage

Store a value:

iex> ProcessStore.store(:my_key, "my value")
nil

# When a key already exists, store the new value and return the previous one.
iex> ProcessStore.store(:my_key, "a new value")
"my value"

Fetch a value:

iex> ProcessStore.fetch(:my_key)
"a new value"

iex> ProcessStore.store(:non_existing_key)
nil

The stored values are available in different processes:

iex> ProcessStore.store(:my_key, "my value")
nil

iex> task = Task.async(fn -> ProcessStore.fetch(:my_key) end)
%Task{
  owner: #PID<0.184.0>,
  pid: #PID<0.208.0>,
  ref: #Reference<0.1292195905.2439512066.24239>
}

iex> Task.await(task)
"my value"