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PySched-Lightning-0.1.1
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مشاهده بیشترتوضیحات
A lightweight task queue scheduler that runs in the background
| ویژگی | مقدار |
|---|---|
| سیستم عامل | OS Independent |
| نام فایل | PySched-Lightning-0.1.1 |
| نام | PySched-Lightning |
| نسخه کتابخانه | 0.1.1 |
| نگهدارنده | [] |
| ایمیل نگهدارنده | [] |
| نویسنده | Yi Zhang |
| ایمیل نویسنده | yizhang.dev@gmail.com |
| آدرس صفحه اصلی | https://github.com/yzhang-dev/PySched-Lightning |
| آدرس اینترنتی | https://pypi.org/project/PySched-Lightning/ |
| مجوز | MIT |
# PySched-Lightning
PySched-Lightning is
* a lightweight task queue scheduler that runs in the background
* written in [Python (3.7+) Standard Library](https://docs.python.org/3.7/library/)
PySched-Lightning supports to
* schedule task execution after a given delay
* schedule recurring task execution
* prioritize tasks
* execute tasks using thread pool or process pool
* run in the background
* use `@task` decorator to define task
## Quickstart
Define your function, `now(cost)` as an example:
```python
import time
def now(cost=1):
time.sleep(cost)
print( time.strftime('%Y-%m-%d %H:%M:%S %Z', time.localtime()) )
def utcnow(cost=1):
time.sleep(cost)
print( time.strftime('%Y-%m-%d %H:%M:%S %Z', time.gmtime()) )
```
Create a PySched-Lightning scheduler, then enqueue your tasks and start the scheduler, **or you could start the scheduler first then enqueue your tasks**:
```python
import pysched-lightning
sched = pysched-lightning.Scheduler()
sched.delay(trigger='recur', interval=3, priority=2, fn=now, args=(1,))
sched.delay(trigger='recur', interval=2, priority=1, fn=utcnow, args=(1,))
sched.start()
```
Shutdown the scheduler:
```python
sched.shutdown(wait=True)
```
### Play with the `@task` decorator
Use `@task` decorator to define your function, then schedule it and start the scheduler, `now(cost)` as an example:
```python
import pysched-lightning
sched = pysched-lightning.Scheduler()
sched.start()
import time
@pysched-lightning.task(sched, 'recur', 3, 2)
def now(cost=1):
time.sleep(cost)
print( time.strftime('%Y-%m-%d %H:%M:%S %Z', time.localtime()) )
now.delay(cost=1)
@pysched-lightning.task(sched, 'recur', 2, 1)
def utcnow(cost=1):
time.sleep(cost)
print( time.strftime('%Y-%m-%d %H:%M:%S %Z', time.gmtime()) )
utcnow.delay(cost=1)
```
When you'd like to cancel the recurring execution, shutdown the scheduler as usual:
```python
sched.shutdown(wait=True)
```
### Install PySched-Lightning
```bash
$ pip install pysched-lightning
```
## Documentation
### `ThreadPoolExecutor`/`ProcessPoolExecutor`
```python
class pysched-lightning.ThreadPoolExecutor/ProcessPoolExecutor(max_workers=<num_cpu_cores>)
```
`max_worker` is set for `ThreadPoolExecutor`/`ProcessPoolExecutor`, default value is the number of CPU cores.
* `future`
[`Future`](https://docs.python.org/3/library/concurrent.futures.html#concurrent.futures.Future) object
* `run(fn, args=(), kwargs={})`
Execute the function using thread pool or process pool.
* `shutdown(wait=True)`
Shutdown the executor.
### `Scheduler`
```python
class pysched-lightning.Scheduler(executor=ThreadPoolExecutor(), timefunc=time.monotonic, delayfunc=time.sleep)
```
Default executor is a thread pool. `timefunc` should be callable without arguments, and return a number, the time at the moment. `delayfunc` should be callable with one argument, compatible with the output of `timefunc`, and should delay that many time units (seconds as default time unit).
* `stopped`
The scheduler is stopped or not, `True` (default) or `False`.
* `task`
The task id, `Task` object (`collections.namedtuple('Task', 'trigger, interval, time, priority, fn, args, kwargs, id')`) dictionary, `{}` as default
* `result`
The task id, result (`{'timestamp': timestamp, 'task': task, 'future': future}`) dictionary, `{}` as default.
* `delay(trigger, interval, priority, fn, args=(), kwargs={})`
`trigger` must be `'cron'` or `'recur'`. Enqueue the task, schedule the execution and return a corresponding id.
* `start()`
Let scheduler start in the background.
* `cancel(task_id)`
Cancel a certain task with its id.
* `shutdown(wait=True)`
Shutdown the scheduler.
### `task`
```python
class pysched-lightning.task(scheduler, trigger, interval, priority)
```
`trigger` must be `'cron'` or `'recur'`.
* Use `@task` decorator to define your function, then enqueue it:
```python
@task(scheduler, trigger, interval, priority)
def fn(args, kwargs):
pass
fn.delay(*args, **kwargs)
```
`fn.delay(*args, **kwargs)` is equivaluent to `sheduler.delay(trigger, interval, priority, fn, args, kwargs)` using normal function definition.
## Related Projects
* [Lib/sched.py](https://github.com/python/cpython/blob/3.7/Lib/sched.py) ([`sched` - Event scheduler](https://docs.python.org/3.7/library/sched.html))
* [APScheduler](https://github.com/agronholm/apscheduler) ([apscheduler.readthedocs.org](http://apscheduler.readthedocs.org))
زبان مورد نیاز
| مقدار | نام |
|---|---|
| >=3.7 | Python |
نحوه نصب
نصب پکیج whl PySched-Lightning-0.1.1:
pip install PySched-Lightning-0.1.1.whl
نصب پکیج tar.gz PySched-Lightning-0.1.1:
pip install PySched-Lightning-0.1.1.tar.gz