Skip to main content

Java Concurrency & Threads

My Blog Post

Java Concurrency

    Topic covered here are
      Concurrency vs Parallelisim

A process is a group of threads and thread is an smallest unit of execution. Every thread has two data areas i.e. Execution Stack and Program counter register. Execution stack is created when the thread starts, and it stores local variables, method call frames.

A process is a group of threads and thread is an smallest unit of execution. Program counter register Keeps track of the address of the currently executing instruction

Thread shares Heap Memory, Runtime constant pool and Method area

Thread life cycle, Thread th = new Thread(), here the thread object is created but execution is not yet started, when the th.start() method is called thread is elligible to run or running state, when the thread completes or uncaught exception is throw thread state becomes terminated. A running thread can move to BLOCKED, WAITING or SLEEP(TIMED_WAITING) state.

A thread is in the WAITING state when it is waiting indefinitely for another thread to perform a particular action, This occurs when a thread calls Object.wait(), Thread.join(). Object.notify() or Object.notifyAll() signal moves the thread to RUNNABLE state.

A thread is in the BLOCKED state when it is waiting to acquire a lock

Happy blogging!

Posted on February 9, 2025 by Rahul

Labels:

Comments

Post a Comment

Popular posts from this blog

Hexagonal Architecture (Ports & Adapters Pattern)

Hexagonal Architecture , also known as the Ports and Adapters pattern, is a software design pattern that aims to create a decoupled and maintainable application by separating the core business logic from external concerns (like databases, APIs, and UIs). Structure of Hexagonal Architecture A typical Hexagonal Architecture has three main layers: 1️⃣ Core Domain (Application Logic) This contains the business rules and domain models. It is completely independent of external technologies . Example: If you’re building a banking system , this part would include logic for transactions, withdrawals, and deposits . 2️⃣ Ports (Interfaces) These are interfaces that define how the core interacts with external components. Two types of ports: Inbound Ports (driven by external inputs like APIs, UI, or events) Outbound Ports (used to interact with external services like databases, messaging systems, etc.) 3️⃣ Adapters (Implementation of Ports) These are concrete implementations of the ports, re...
Post a Comment
Read more

Recursion & Choice

Understanding Recursion and Choice Diagrams with Examples Understanding Recursion and Choice Diagrams with Examples Recursion is a powerful concept in programming where a function calls itself to solve smaller instances of the same problem. It's often used in solving complex problems that can be broken down into simpler subproblems. In this blog post, we'll explore the basics of recursion, understand choice diagrams, and see examples to illustrate these concepts. What is Recursion? Recursion occurs when a function calls itself directly or indirectly to solve a problem. A recursive function must have a base case to terminate the recursive calls and prevent infinite recursion. Here's a simple example of a recursive function to calculate the factorial of a number: public class RecursionExample { public static void main(String[] args) { int number = 5; int result = factorial(...
Post a Comment
Read more

Frameworks

  Communication Frameworks: BLUF:  Google's culture strongly emphasizes efficiency and directness, so getting to the "bottom line up front" is very common. SCQA:  Used in presenting proposals, making recommendations, and structuring project plans. PAS : Used in selling ideas and influencing others. BAB : Used in selling ideas and influencing others. Sparklines : Used in presentation to influence others. STAR:  Widely used in Google's interview process and performance evaluations. Problem-Solving/Decision-Making Frameworks: 5 Whys:  A fundamental technique for root cause analysis, and Google is known for its emphasis on data-driven decision-making, which often involves digging into the root causes of problems. Systems Thinking:  Given the complexity of Google's systems, a systems thinking approach is essential. The Four Questions : Used in post-mortem to review an incident. Human factors : Used in post-mortem to avoid the blame culture. Time Management/Prior...
Post a Comment
Read more