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finist-0.1.2
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Redis based Finite State Machine.
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | finist-0.1.2 |
| نام | finist |
| نسخه کتابخانه | 0.1.2 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Sumanau Sareen |
| ایمیل نویسنده | finist-python@googlegroups.com |
| آدرس صفحه اصلی | https://github.com/sumanau7/finist |
| آدرس اینترنتی | https://pypi.org/project/finist/ |
| مجوز | APACHE |
Finist
======
Redis based Finite State Machine.
Description
-----------
Finist is a finite state machine that is defined and persisted in
[Redis][redis].
Community
---------
Meet us on IRC: [#lesscode](irc://chat.freenode.net/#lesscode) on
[freenode.net](http://freenode.net/).
Related projects
----------------
* [Finist implemented in Lua][finist.lua]
* [Finist implemented in Ruby][finist.lua]
* [Finist implemented in Rust][finist.ruby]
Getting started
---------------
Install [Redis][redis]. On most platforms it's as easy as grabbing
the sources, running make and then putting the `redis-server` binary
in the PATH.
Once you have it installed, you can execute `redis-server` and it
will run on `localhost:6379` by default. Check the `redis.conf`
file that comes with the sources if you want to change some settings.
Usage
-----
Finist requires a Redis [Python Redis] compatible client. To make things
easier, `redic` is listed as a runtime dependency so the examples
in this document will work.
```python
from finist import Finist
import redis
redis_conn = redis.Redis()
# Initialize with a Redis client, the name of the machine and the
# initial state. In this example, the machine is called "order" and
# the initial status is "pending". The Redis client is connected to
# the default host (127.0.0.1:6379).
machine = Finist(redis_conn, "order", "pending")
# Available transitions are defined with the `on` method
# `machine.on(<event>, <initial_state>, <final_state>)`
machine.on("approve", "pending", "approved")
machine.on("cancel", "pending", "cancelled")
machine.on("cancel", "approved", "cancelled")
machine.on("reset", "cancelled", "pending")
```
Now that the possible transitions are defined, we can check the
current state:
```python
machine.state()
# => "pending"
```
And we can trigger an event:
```python
machine.trigger("approve")
# => ["approved", true]
```
The `trigger` method returns an array of two values: the first
represents the current state, and the second represents whether
a transition occurred.
Here's what happens if an event doesn't cause a transition:
```python
machine.trigger("reset")
# => ["approved", false]
```
Here's a convenient way to use this flag:
```python
state, changed = machine.trigger("reset")
if changed
print "State changed to %s\n" %state
```
If you need to remove all the transitions for a given event, you
can use `rm`:
```python
machine.rm("reset")
```
Note that every change is persisted in Redis.
Representation
--------------
Each event is represented as a hash in Redis, and its field/value
pairs are the possible transitions.
For the FSM described in the examples above, the keys are laid out
as follows:
```ini
# Current state
finist:order (string)
# Transitions for event `approve`
finist:order:approve (hash)
pending -> approved
# Transitions for event `cancel`
finist:order:cancel (hash)
pending -> cancelled
approved -> cancelled
# Transitions for event `reset`
finist:order:reset (hash)
cancelled -> pending
```
Installation
------------
```
$ python setup.py install
or
$ pip install finist
```
[redis]: http://redis.io
[Python Redis]: https://github.com/andymccurdy/redis-py
[finist.lua]: https://github.com/soveran/finist.lua
[finist.rust]: https://github.com/badboy/finist
[finist.ruby]: https://github.com/soveran/finist
نحوه نصب
نصب پکیج whl finist-0.1.2:
pip install finist-0.1.2.whl
نصب پکیج tar.gz finist-0.1.2:
pip install finist-0.1.2.tar.gz