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== Usage == To use GenServer, developers need to implement their own module that defines the GenServer behavior. This module must define the required callbacks and is responsible for managing the state and behavior of the server. Once implemented, the GenServer can be started using the `Server.start_link/3` function. Below is an example of a simple GenServer module: ```elixir defmodule Counter do use GenServer def start_link(initial_count) do GenServer.start_link(__MODULE__, initial_count) end def init(initial_count) do {:ok, initial_count} end def handle_call(:increment, _from, count) do {:reply, count + 1, count + 1} end def handle_call(:get_count, _from, count) do {:reply, count, count} end def handle_cast(:reset, count) do {:noreply, 0} end end ``` In this example, the `Counter` module defines a GenServer that manages a simple count state. It provides functions to increment the count, get the current count, and reset the count to zero. To interact with the GenServer, you can use the `call/2` and `cast/2` functions: ```elixir {:ok, pid} = Counter.start_link(0) {:ok, 1} = GenServer.call(pid, :increment) {:ok, 1} = GenServer.call(pid, :get_count) :ok = GenServer.cast(pid, :reset) {:ok, 0} = GenServer.call(pid, :get_count) ``` These functions allow for synchronous and asynchronous communication with the server.
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