Queues in message brokers in Data Structures Theory - Mini Project: Build & Apply

Understanding Queues in Message Brokers

📖 Scenario: You are learning how message brokers use queues to manage communication between different parts of a software system. Imagine a post office where letters (messages) are placed in a line (queue) to be delivered one by one.

🎯 Goal: Build a simple representation of a message queue system to understand how messages are added, stored, and processed in order.

📋 What You'll Learn

Create a list called message_queue with three specific messages.

Add a variable called max_queue_size to limit the queue length.

Write code to add a new message only if the queue is not full.

Write code to remove the first message from the queue to simulate processing.

💡 Why This Matters

🌍 Real World

Message queues are used in software systems to manage tasks and communication between different parts, like orders waiting to be processed.

💼 Career

Understanding queues helps in roles like software development, system administration, and cloud engineering where message brokers are common.

1

Create the initial message queue

Create a list called message_queue with these exact messages: 'Order_123', 'Order_456', and 'Order_789'.

Data Structures Theory

# Create the message_queue list with three messages
# Your code here

Need a hint?

Use square brackets [] to create a list and separate messages with commas.

2

Set the maximum queue size

Add a variable called max_queue_size and set it to 5 to limit how many messages the queue can hold.

Data Structures Theory

message_queue = ['Order_123', 'Order_456', 'Order_789']
# Set max_queue_size to 5
# Your code here

Need a hint?

Just assign the number 5 to the variable max_queue_size.

3

Add a new message if queue is not full

Write code to add the message 'Order_101' to message_queue only if the length of message_queue is less than max_queue_size.

Data Structures Theory

message_queue = ['Order_123', 'Order_456', 'Order_789']
max_queue_size = 5
# Add 'Order_101' if queue is not full
# Your code here

Need a hint?

Use len() to check the queue size and append() to add the message.

4

Process the first message in the queue

Write code to remove the first message from message_queue to simulate processing it. Use the pop(0) method.

Data Structures Theory

message_queue = ['Order_123', 'Order_456', 'Order_789']
max_queue_size = 5
if len(message_queue) < max_queue_size:
    message_queue.append('Order_101')
# Remove the first message from the queue
# Your code here

Need a hint?

Use pop(0) to remove the first item from the list.