Welcome back! In the previous lesson, we explored the importance of a robust system prompt and how it guides the behavior of our personal tutor. Now, we will delve into the next step of our journey: building the Session Manager. This lesson will focus on the model layer of the MVC (Model-View-Controller) architecture, which is crucial for organizing and managing data in a structured way. The SessionManager class will be the core component of our model layer, responsible for managing tutoring session data effectively. By the end of this lesson, you will understand how to create, manage, and retrieve session data using the SessionManager class.

Next, we'll add the CreateSession method. This method is responsible for creating a new session entry for a user. It takes three parameters: userId, sessionId, and systemPrompt.

The CreateSession method checks if the userId exists in sessions. If not, it creates a new entry. Then, it initializes the session with the provided systemPrompt and an empty list for messages.

To access a specific tutoring session, we need the GetSession method. This method retrieves a session based on the userId and sessionId.

The GetSession method safely accesses the nested dictionary, returning the session data if it exists.

Now, let's add the AddMessage method. This method allows us to append messages to a session. It requires the userId, sessionId, role, and content of the message.

The AddMessage method first retrieves the session using GetSession. If the session exists, it appends the message to the session's message list.

Finally, we'll implement the GetConversation method. This method returns the entire conversation, including the system prompt and all messages.

The GetConversation method retrieves the session and constructs a list starting with the system prompt, followed by the session messages. If the session does not exist, it returns an empty list.

By following these steps, we've built a fully functional SessionManager class that can create and manage tutoring sessions, add messages, and retrieve conversation histories.

To create a new tutoring session, we use the CreateSession method. This method takes three parameters: userId, sessionId, and systemPrompt. It initializes a new session entry in the sessions dictionary. If the userId does not already exist in the dictionary, a new entry is created. The session entry includes the system prompt and an empty list for messages.

Here's an example of how to create a new tutoring session:

In this example, we initialize a SessionManager instance and create a new tutoring session for a user with the ID "test_user". The session is identified by "test_session" and is initialized with a system prompt. This setup allows us to manage tutoring session data efficiently.

Once a session is created, we can add messages to it using the AddMessage method. This method requires the userId, sessionId, role, and content of the message. The role indicates whether the message is from the user or the tutor assistant. The message is then appended to the session's message list.

Here's how you can add messages to a tutoring session using a loop:

In this example, we prepare a list of messages and use a loop to add each message to the session. The AddMessage method ensures that messages are stored in the correct session entry.

To retrieve the entire conversation, including the system prompt, we use the GetConversation method. This method returns a list of messages, starting with the system prompt followed by the session messages.

The GetConversation method compiles the session history, allowing us to access the full context of the conversation. This is particularly useful when we need to provide the full conversation history to the model to ensure contextual responses.

In this lesson, we explored the SessionManager class and its role in managing tutoring session data within the model layer of our application. We learned how to create and manage sessions, add messages, and retrieve conversation histories. The SessionManager is a crucial component for organizing session data, ensuring that our personal tutor can handle multiple tutoring sessions efficiently.

As you move on to the practice exercises, take the opportunity to experiment with modifying and extending the SessionManager functionality. This hands-on practice will reinforce the concepts covered in this lesson and prepare you for the next steps in our course. Keep up the great work, and I look forward to seeing your progress!