Package go-fsm is a zero-alloc, high performance, pure go Finite State Machine implementation.
go get github.com/zerjioang/go-fsmmachine := fsm.New()
machine.AddState("start", fsm.NoStateEvents)
machine.AddState("a", fsm.NoStateEvents)
machine.AddState("b", fsm.NoStateEvents)
machine.AddState("c", fsm.NoStateEvents)
machine.AddState("finish", fsm.NoStateEvents)
machine.AddTransaction("toA", "start", "a")
machine.AddTransaction("toB", "a", "b")
machine.AddTransaction("toC", "a", "c")
machine.AddTransaction("backToA", "c", "a")
machine.AddTransaction("moveToC", "b", "c")
machine.AddTransaction("toFinish", "b", "finish")
machine.AddTransaction("toFinish", "c", "finish")
machine.SetInitialState("start")
machine.SetFinalState("finish")
machine.ChangeStateTo("a")
dot := machine.DotGraph()
fmt.Println(dot)This library also allows developers to create raw .dot files as following, in an automatic way:
digraph fsm {
size ="4,4";
node [shape=circle,fontsize=12,fixedsize=true,width=0.8];
edge [fontsize=6];
rankdir=LR;
"b" -> "c" [ label = "moveToC" ];
"b" -> "finish" [ label = "toFinish" ];
"c" -> "finish" [ label = "toFinish" ];
"start" -> "a" [ label = "toA" ];
"a" -> "b" [ label = "toB" ];
"a" -> "c" [ label = "toC" ];
"c" -> "a" [ label = "backToA" ];
"start" [shape="doublecircle" color="blue"];
"a" [shape="circle" color="black"];
"b" [shape="circle" color="black"];
"c" [shape="circle" color="black"];
"finish" [shape="doublecircle" color="red"];
}Always do benchmarking with your own data. Here are mine:
BenchmarkFsm/instantiation-4 30000000 47.7 ns/op 20.95 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/instantiation-ptr-4 10000000 139 ns/op 7.15 MB/s 96 B/op 2 allocs/op
BenchmarkFsm/add-state-4 50000000 24.2 ns/op 41.36 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/add-state-no-name-4 100000000 20.2 ns/op 49.41 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/add-state-no-event-4 100000000 23.7 ns/op 42.12 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/change-state-empty-4 100000000 22.2 ns/op 45.00 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/change-state-4 30000000 56.4 ns/op 17.72 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/has-state-false-4 300000000 4.37 ns/op 228.80 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/has-state-true-4 200000000 7.58 ns/op 131.93 MB/s 0 B/op 0 allocs/op
BenchmarkFsm/to-dot-4 300000 5310 ns/op 0.19 MB/s 2210 B/op 29 allocs/op
PASSAll rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
- Uses GPL license described below
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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