https://github.com/howl-anderson/microsingleton
https://github.com/howl-anderson/microsingleton
Last synced: 2 months ago
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- Host: GitHub
- URL: https://github.com/howl-anderson/microsingleton
- Owner: howl-anderson
- Created: 2017-06-22T13:51:15.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2018-07-04T12:41:42.000Z (over 7 years ago)
- Last Synced: 2025-01-21T21:47:03.613Z (9 months ago)
- Language: Python
- Size: 2.93 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# MicroSingleton
A micro library for singleton pattern (both application and class level)
## Application level singleton
Only one application instance can run at same time.
`MicroSingleton` allow programmer to stop second instance or just kill existed instance.
### Demo
#### Code
This code is also stored in 'demo/webapp.py'
```python
from singleton.application.singleton import SingletonApplication
from singleton.application.action import Action
from flask import Flask
app = Flask(__name__)
SingletonApplication("./MicroSingleton.pid").action(Action.SINGLETON)
@app.route('/')
def hello_world():
return 'Hello, World!'
if __name__ == "__main__":
app.run()
```
#### First instance
Start first instance by execute:
```bash
python ./demo/webapp.py
```
You will get output message:
```text
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
```
#### Second instance
Start first instance by execute same code in other terminal:
```bash
python ./demo/webapp.py
```
You will get output message from second instance:
```text
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
```
Then you will see console of first instance output message and return like:
```text
Terminated: 15
```
#### Conclude
After this demo, you should notice that this demo application are singleton at application level.