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== Gen FSM == [[File:Gen_fsm_logo.png|right|200px|Gen FSM logo]] '''Gen FSM''' is a module in Elixir that stands for Generic Finite State Machine. It provides a behavioral abstraction which allows you to define and manage state machines in your programs. This module is built upon the [[Gen]] behavior and is widely used for implementing robust and scalable applications. == Features == * State and event driven behavior * Asynchronous message passing * Supports structured error handling * Built-in supervision * Scalability and fault-tolerance == Usage == To use Gen FSM, you need to define a module that implements the `Gen.Server` behavior and use the `GenFSM` macro to define the FSM behavior. Here's a basic example: ```elixir defmodule MyFSM do use Gen.Server use GenFSM # Define the states of the FSM defstates :init, :state1, :state2 # Define the events and their resulting state transitions deftransitions init: { :event1, :state1 }, state1: { :event2, :state2 }, state2: { :event3, :state1 } # Implement the callback functions def handle_call(:event1, _from, state) do {:reply, "Event 1 handled", state} end def handle_call(:event2, _from, state) do {:reply, "Event 2 handled", state} end def handle_call(:event3, _from, state) do {:reply, "Event 3 handled", state} end end ``` You can then start and interact with an instance of your FSM: ```elixir {:ok, pid} = GenFSM.start_link(MyFSM, :init) GenFSM.call(pid, :event1) GenFSM.call(pid, :event2) GenFSM.call(pid, :event3) ``` == Benefits == By using the Gen FSM module, you can leverage the following benefits: * Better organization of code by encapsulating state-related logic * Improved maintainability and readability of state machines * Streamlined error handling through pattern matching * Simplified supervision and fault tolerance == See Also == * [[Elixir]] - The programming language upon which Gen FSM is built * [[Gen]] - The behavior that Gen FSM is based on == References == {{reflist}} [[Category:Elixir Programming Language]] [[Category:Behavioral Abstractions]]
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