Queue events and monitoring in NestJS - Mini Project: Build & Apply

Queue Events and Monitoring in NestJS

📖 Scenario: You are building a simple task queue system in a NestJS application. You want to track when tasks are added to the queue and when they are completed. This helps you monitor the queue's activity and ensure tasks are processed correctly.

🎯 Goal: Create a NestJS service that manages a queue of tasks. You will add tasks to the queue, track events when tasks are added and completed, and print monitoring messages to the console.

📋 What You'll Learn

Create a queue array to hold task names

Add a configuration variable to count completed tasks

Implement functions to add tasks and mark them as completed with event logs

Print the current queue and completed task count

💡 Why This Matters

🌍 Real World

Monitoring queue events helps teams track task progress and system health in real-time, which is critical for reliable applications.

💼 Career

Understanding queue event handling and monitoring is essential for backend developers and DevOps engineers working with task processing systems.

1

Create the initial queue array

Create a variable called taskQueue and set it to an empty array to hold task names.

NestJS

# Create a variable called taskQueue as an empty array
# Your code here

Need a hint?

Use const taskQueue: string[] = []; to create an empty array for tasks.

2

Add a completed task counter

Create a variable called completedCount and set it to 0 to count completed tasks.

NestJS

const taskQueue: string[] = [];
# Create a variable called completedCount and set it to 0
# Your code here

Need a hint?

Use let completedCount = 0; to track how many tasks are done.

3

Implement add and complete task functions with event logs

Write a function called addTask that takes a taskName string, adds it to taskQueue, and logs "Task added: ". Write another function called completeTask that removes the first task from taskQueue, increments completedCount, and logs "Task completed: ".

NestJS

const taskQueue: string[] = [];
let completedCount = 0;
# Write addTask and completeTask functions with console logs
# Your code here

Need a hint?

Use taskQueue.push(taskName) to add and taskQueue.shift() to remove the first task. Use console.log to print messages.

4

Print the queue and completed task count

Write two console.log statements: one to print "Current queue:" followed by the taskQueue array, and another to print "Completed tasks:" followed by the completedCount.

NestJS

const taskQueue: string[] = [];
let completedCount = 0;

function addTask(taskName: string) {
    taskQueue.push(taskName);
    console.log(`Task added: ${taskName}`);
}

function completeTask() {
    const taskName = taskQueue.shift();
    if (taskName) {
        completedCount++;
        console.log(`Task completed: ${taskName}`);
    }
}

addTask("Build API");
addTask("Run tests");
completeTask();

# Print the current queue and completed task count
# Your code here

Need a hint?

Use console.log("Current queue:", taskQueue); and console.log("Completed tasks:", completedCount); to show the status.