MyPubSub

MyPubSub is a Python library implementing the publish-subscribe pattern. It provides a simple and effective way to manage event-driven communication between different parts of an application. This project also demonstrates the use of the Singleton pattern to ensure that only one instance of the PubSub system exists.

Features

• Publish-Subscribe Pattern: Facilitate event-based communication where publishers send messages and subscribers receive them.
• Singleton Pattern: Ensures only a single instance of the PubSub system exists throughout the application.
• Flexible Event Management: Allows for dynamic subscription and unsubscription of events.

Installation

To use the MyPubSub library, you need to install the required dependencies. You can install them using pip:

pip install .

Dependencies

• Python 3.8 or higher
• pylint (for code quality checks)
• pytest (for testing)

Usage

Here’s a basic example of using the MyPubSub class:

from mypubsub import MyPubSub

# Get the singleton instance of MyPubSub
pubsub = MyPubSub.get_instance()

# Define a callback function for subscribers
def handle_message(message):
    print(f"Received message: {message}")

# Subscribe to an event
pubsub.subscribe('event_topic', handle_message)

# Publish a message to the event
pubsub.publish('event_topic', 'Hello, World!')

# Unsubscribe from the event
pubsub.unsubscribe('event_topic', handle_message)

# Reset the singleton instance (useful for testing)
MyPubSub.reset_instance()

Testing

To run tests, ensure pytest is installed:

pip install pytest

Then execute the tests with:

pytest

Contributing

Contributions are welcome! To contribute, fork the repository, create a new branch, and submit a pull request. Ensure that your changes include appropriate tests.