jobtastic-mixins 0.1

Provides ability calculate average time of tasks

JobtasticMixins
===============

## Package includes:

#### AVGTimeRedis class
The class that helps automate calculate an avarage time
for different kind tasks and saves result into Redis DB


## Install
Install from Github

```pip install https://github.com/abbasovalex/JobtasticMixins/archive/master.zip```


## Usage

1. You must will add the mixin class as first argument
2. You should set ```default_avg_time``` in the seconds
3. You must use ```self.update_progress()``` without arguments

```python
class YourTask(AVGTimeRedis, JobtasticTask):
default_avg_time = 60 # 1 minute

...

def calculate_result(self, ..., **kwargs):
...
```

```default_avg_time``` used when task still never calculated
It will be encompass arithmetical mean after task was executed.
Forecast accuracy depends from count executed tasks


### Example with AVGTimeRedis class

The class that helps automate calculate an avarage time for different kind
tasks and saves result into Redis DB

Let's take a look at the example task using with JobtasticMixins and
AVGTimeRedis class:

``` python
from time import sleep
from jobtastic import JobtasticTask
from jobtasticmixins import AVGTimeRedis


class LotsOfDivisionTask(AVGTimeRedis, JobtasticTask):
"""
Division is hard. Make Celery do it a bunch.
"""
significant_kwargs = [
('numerators', str),
('denominators', str),
]
herd_avoidance_timeout = 60
cache_duration = 0
# optional variable was added. by default is 30 seconds
default_avg_time = 90

def calculate_result(self, numerators, denominators, **kwargs):
results = []
for count, divisors in enumerate(zip(numerators, denominators)):
numerator, denominator = divisors
results.append(numerator / denominator)
# it will be auto calculated
self.update_progress()
sleep(0.1)

# set finish=True for avoid trouble
self.update_progress(finish=True)
return results

```

Under the hood:

1. AVGTimeRedis gets settings.BROKER_URL and connects to Redis
2. It counts the tasks and the workers and uses to calculating

More details you can see into [source](https://github.com/abbasovalex/JobtasticMixins/blob/master/jobtasticmixins/mixins.py)