gblackboard 0.2.2

Blackboard pattern implementation

===========
gblackboard
===========


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:alt: Documentation Status




Blackboard pattern implementation


* Free software: MIT license
* Documentation: https://gblackboard.readthedocs.io.
* Repository: https://github.com/GTedHa/gblackboard


Features
-------

* To be updated
* Refer to 'Usage'


Usage
-------

To use gblackboard in a project:

- basic usage::

.. code-block:: python

from gblackboard import Blackboard
from gblackboard import SupportedMemoryType

blackboard = Blackboard(SupportedMemoryType.DICTIONARY)
# Set a key-value data;
# `set` method should be called only once for a key.
# It's a kind of initialization for data.
blackboard.set('key', 'value')
# Retrieve data with key.
value = blackboard.get('key')
# Update data with new value;
# `update` method should be called
# after `set` method called for a key.
blackboard.update('key', 'new_value')
# Delete data from blackboard with key.
blackboard.drop('key')
# Clear all data in blackboard.
blackboard.clear()


- observer::

.. code-block:: python

from gblackboard import Blackboard
from gblackboard import SupportedMemoryType

def callback(data):
print(data)

blackboard = Blackboard(SupportedMemoryType.DICTIONARY)
blackboard.set('key', 'value')
# Register `callback` function as a callback.
blackboard.register_callback('key', callback)
# Update data;
# `callback` function will be called during `update`,
# and `new_value` will passed to `callback` function.
blackboard.update('key', 'new_value')


- complex data::

.. code-block:: python

from gblackboard import Blackboard
from gblackboard import SupportedMemoryType

import datetime as dt

class User(object):

def __init__(self, name, email):
self.name = name
self.email = email
self.created_at = dt.datetime.now()

def __repr__(self):
return '<User(name={self.name!r})>'.format(self=self)

blackboard = Blackboard(SupportedMemoryType.DICTIONARY)

# You can also store customized class objects in blackboard.
blackboard.set('user', User("G.Ted", "[e-mail]"))
user = blackboard.get('user')
print(user)
# <User(name='G.Ted')> will be printed.

# List of complex objects is also supported.
blackboard.set('users',
[
User("User1", "[e-mail]"),
User("User2", "[e-mail]"),
]
)
users = blackboard.get('users')
print(users)
# [<User(name='User1')>, <User(name='User2')>] will be printed.


- save & load::

.. code-block:: python

from gblackboard import Blackboard
from gblackboard import SupportedMemoryType

import datetime as dt

class User(object):

def __init__(self, name, email):
self.name = name
self.email = email
self.created_at = dt.datetime.now()

def __repr__(self):
return '<User(name={self.name!r})>'.format(self=self)

blackboard = Blackboard(SupportedMemoryType.DICTIONARY)
# Store sample data
blackboard.set('user', User("G.Ted", "[e-mail]"))
# Save current blackboard contents as file.
blackboard.save()
# Close current blackboard;
# this means clear all data in blackboard
blackboard.close()
# ------------------------------------------------------------
blackboard = Blackboard(SupportedMemoryType.DICTIONARY)
# Load saved blackboard contents from files.
blackboard.load()
user = blackboard.get('user')
print(user)
# <User(name='G.Ted')> will be printed.


TODO
-------

* `Save & Load` on subprocess
* Validation for Redis configurations
* Print blackboard contents for debugging


Credits
-------

This package was created with Cookiecutter_ and the `audreyr/cookiecutter-pypackage`_ project template.

.. _Cookiecutter: https://github.com/audreyr/cookiecutter
.. _`audreyr/cookiecutter-pypackage`: https://github.com/audreyr/cookiecutter-pypackage


=======
History
=======

0.1.0 (2019-01-24)
------------------

* First commit on GitHub.


0.1.1 (2019-01-30)
------------------

* Add fakeredis for test


0.2.0 (2019-02-16)
------------------

* Eliminates the limitations of supported data types.
* Change object serialization method for storing data from JSON serialization method using marshmallow (external)
library to serialization method using pickle library.
* Replace CRUD methods of redis with Hash-CRUD methods
- set(key, value) -> hset('gblackboard', key, value)
- get(key) -> hget('gblackboard', key)
- delete(key) -> hdel('gblackboard', key)
- exists(key) -> hexists('gblackboard', key)
* Remove useless setup() step and mem_ready status
* Add raise_conn_error (raise 'connection error') decorator for RedisWrapper CRUD methods
* Add save & load features