The Node.js Event Loop: Not So Single Threaded
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This document contains code snippets and graphs demonstrating the difference between synchronous and asynchronous functions in JavaScript. It shows how synchronous functions like crypto.pbkdf2Sync block further code execution, while asynchronous functions like crypto.pbkdf2 and https.request allow other work to continue in parallel and complete faster overall.
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But as we embrace these new technologies, we must also ask ourselves: Are we becoming less capable of thinking for ourselves? Do these tools make us smarter, or do they risk dulling our critical thinking skills? This talk will encourage us to think critically about the role of AI in our education. Together, we will discover how to use AI to support our learning journey while still developing our ability to think critically.
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Buy vs. Build: Unlocking the right path for your training techRustici Software Investing in training technology is tough and choosing between building a custom solution or purchasing an existing platform can significantly impact your business. While building may offer tailored functionality, it also comes with hidden costs and ongoing complexities. On the other hand, buying a proven solution can streamline implementation and free up resources for other priorities. So, how do you decide?
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How I solved production issues with OpenTelemetry
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In this session, I'll show you how I used OpenTelemetry to solve several production problems. You'll learn how I uncovered critical issues that were invisible without the right telemetry data - and how you can do the same. OpenTelemetry provides the tools you need to understand what's happening in your application in real time, from tracking down hidden bugs to uncovering system bottlenecks. These solutions have significantly improved our applications' performance and reliability.
A key concept we will use is traces. Architecture diagrams often don't tell the whole story, especially in microservices landscapes. I'll show you how traces can help you build a service graph and save you hours in a crisis. A service graph gives you an overview and helps to find problems.
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Unit Two - Java Architecture and OOPS
Unit Two - Java Architecture and OOPSNabin Dhakal Java Architecture
Java follows a unique architecture that enables the "Write Once, Run Anywhere" capability. It is a robust, secure, and platform-independent programming language. Below are the major components of Java Architecture:
1. Java Source Code
Java programs are written using .java files.
These files contain human-readable source code.
2. Java Compiler (javac)
Converts .java files into .class files containing bytecode.
Bytecode is a platform-independent, intermediate representation of your code.
3. Java Virtual Machine (JVM)
Reads the bytecode and converts it into machine code specific to the host machine.
It performs memory management, garbage collection, and handles execution.
4. Java Runtime Environment (JRE)
Provides the environment required to run Java applications.
It includes JVM + Java libraries + runtime components.
5. Java Development Kit (JDK)
Includes the JRE and development tools like the compiler, debugger, etc.
Required for developing Java applications.
Key Features of JVM
Performs just-in-time (JIT) compilation.
Manages memory and threads.
Handles garbage collection.
JVM is platform-dependent, but Java bytecode is platform-independent.
Java Classes and Objects
What is a Class?
A class is a blueprint for creating objects.
It defines properties (fields) and behaviors (methods).
Think of a class as a template.
What is an Object?
An object is a real-world entity created from a class.
It has state and behavior.
Real-life analogy: Class = Blueprint, Object = Actual House
Class Methods and Instances
Class Method (Static Method)
Belongs to the class.
Declared using the static keyword.
Accessed without creating an object.
Instance Method
Belongs to an object.
Can access instance variables.
Inheritance in Java
What is Inheritance?
Allows a class to inherit properties and methods of another class.
Promotes code reuse and hierarchical classification.
Types of Inheritance in Java:
1. Single Inheritance
One subclass inherits from one superclass.
2. Multilevel Inheritance
A subclass inherits from another subclass.
3. Hierarchical Inheritance
Multiple classes inherit from one superclass.
Java does not support multiple inheritance using classes to avoid ambiguity.
Polymorphism in Java
What is Polymorphism?
One method behaves differently based on the context.
Types:
Compile-time Polymorphism (Method Overloading)
Runtime Polymorphism (Method Overriding)
Method Overloading
Same method name, different parameters.
Method Overriding
Subclass redefines the method of the superclass.
Enables dynamic method dispatch.
Interface in Java
What is an Interface?
A collection of abstract methods.
Defines what a class must do, not how.
Helps achieve multiple inheritance.
Features:
All methods are abstract (until Java 8+).
A class can implement multiple interfaces.
Interface defines a contract between unrelated classes.
Abstract Class in Java
What is an Abstract Class?
A class that cannot be instantiated.
Used to provide base functionality and enforce
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The Node.js Event Loop: Not So Single Threaded
- 7. • • • • • •
- 13. const crypto = require('crypto'); const NUM_REQUESTS = 2; for (let i = 0; i < NUM_REQUESTS; i++) { crypto.pbkdf2Sync('secret', 'salt', 10000, 512, 'sha512'); }
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- 15. const crypto = require('crypto'); const NUM_REQUESTS = 2; for (let i = 0; i < NUM_REQUESTS; i++) { crypto.pbkdf2('secret', 'salt', 10000, 512, 'sha512', () => {}); }
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- 19. 0 50 100 150 200 250 300 350 400 Time (milliseconds) Execution Timeline 2 Requests 4 Requests 6 Requests
- 22. const https = require('https'); const NUM_REQUESTS = 2; for (let i = 0; i < NUM_REQUESTS; ++i) { https.request('https://nebri.us/static/me.jpg', (res) => { res.on('data', () => {}); res.on('end', () => {}); }).end(); }
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