saksh-task-manager/index.js

A Node.js module for managing tasks with caching and event handling capabilities.

const NodeCache = require('node-cache');
const EventEmitter = require('events');
const Task = require('./taskModel');

// Set up NodeCache for caching
const myCache = new NodeCache();

class SakshTaskController extends EventEmitter {
    constructor(userId) {
        super();
        this.userId = userId;
    }

    // Get all tasks with caching
    async sakshGetTasks() {
        try {
            const cachedTasks = myCache.get(`tasks_${this.userId}`);
            if (cachedTasks) {
                this.emit('tasksRetrieved', cachedTasks);
                return cachedTasks;
            } else {
                const tasks = await Task.find({ userId: this.userId });
                myCache.set(`tasks_${this.userId}`, tasks, 3600); // Cache for 1 hour
                this.emit('tasksRetrieved', tasks);
                return tasks;
            }
        } catch (error) {
            this.emit('error', error);
            throw error;
        }
    }

    // Create a new task
    async sakshCreateTask(taskData) {
        try {
            const task = await Task.create({ ...taskData, userId: this.userId });
            myCache.del(`tasks_${this.userId}`); // Invalidate cache
            this.emit('taskCreated', task);
            return task;
        } catch (error) {
            this.emit('error', error);
            throw error;
        }
    }

    // Update a task
    async sakshUpdateTask(id, taskData) {
        try {
            const task = await Task.findOneAndUpdate({ _id: id, userId: this.userId }, taskData, { new: true });
            myCache.del(`tasks_${this.userId}`); // Invalidate cache
            this.emit('taskUpdated', task);
            return task;
        } catch (error) {
            this.emit('error', error);
            throw error;
        }
    }

    // Delete a task
    async sakshDeleteTask(id) {
        try {
            const task = await Task.findOneAndDelete({ _id: id, userId: this.userId });
            myCache.del(`tasks_${this.userId}`); // Invalidate cache
            this.emit('taskDeleted', task);
            return { message: 'Task deleted' };
        } catch (error) {
            this.emit('error', error);
            throw error;
        }
    }
}

module.exports = SakshTaskController;