Cohesion
Cohesion
Posts by Category
- Blog 41
- System Design 16
- Testing 5
- System Quality 5
- Data Structures 2
- Principles 1
- Design patterns 1
- Concurrency 1
Blog
Java Memory Models
Java Memory Models
Request-Response vs Publish-Subscribe Architecture
Request-Response Architecture Request-Response is a foundational communication pattern primarily utilized in client-server architectures. In this model, a cl...
Trees
a data structure that is constructed with nodes, where each has some value and may point to child-nodes, which recursively form subtrees in the tree.
Graphs
Graph is a collection of nodes that may or may not be connected to each other.
Is Java Pass by Value or by Reference?
Let me answer that question right away, Java is ALWAYS pass by value.
Strings
String
Facade Design Pattern
The Facade design pattern is a structural pattern that allows for hiding the complexity of a subsystem by providing a simple interface to it. The interface ...
Stacks and Queues
Stacks
Hash Tables
A data structure that store data in key-value pairs and provides fast insertion, deletion and searching.
Prefer Composition over Inheritance
Prefer Composition over Inheritance
Linked Lists
Is very similar to array, at least conceptually, to an array.
Arrays
There are two types of arrays. Static and dynamic ones.
Logarithm
It’s mathematical concept which is very often used in Computer Science in context of algorithms complexity, it’s even sounds similar 😀
Big O Notation
The Big O Notation is a mathematical, asymptotic notation that describes time complexity and space complexity of algorithms/ function when the argument tends...
Memory
Key Terms
Complexity Analysis
It’s a process in which we determine how efficient an algorithm is. There are multiple ways to solve the same issue but the complexity analysis will likely d...
Inversion of Control and Dependency Injection
Inversion of Control and Dependency Injection
Core concepts behind OOP
What does mean object-oriented programming?
Concurrency, Threading and Parallelism
Those two concepts are often misunderstood or used interchangeably, where they are completely different concepts.
What is coupling?
In object-oriented paradigm, Coupling refers to the degree of direct knowledge that one element has of another. We may generally divide coupling to tight and...
Specification Design Pattern
Introduction
Depth First Search in Java
Depth First Search [DFS]
Singleton Pattern
Singleton
Static Factory Method
In an object-oriented language like Java, what could be wrong with constructors? Overall, nothing. Even so, the famous Joshua Block’s Effective Java Item 1 c...
Aggregate Pattern
The Aggregate is one of the main pattern in Domain Driven Design (DDD) introduced by Martin Fowler.
How to think and approach refactoring?
Introduce
Difference between @Mock and @MockBean
Introduce
Why business is not eager for refactoring?
Refactoring in a Business Context
Composition, Aggregation and Association
Introduce
BigDecimal and BigInteger in Java
BigDecimal
DeMorgan’s Laws
DeMorgan’s Laws
Builder Design Patter
Builder is a creational design pattern that lets you construct complex objects step by step. The pattern allows you to produce different types and representa...
Java equals and hashCode contract
Equals() method
Comparable and Comparator Interfaces
Comparable.
Spring Cache
What is Spring Cache? How to configure it in your project and how to use it? How does Spring Cache work? How to add an external provider that allows flexible...
Observer Design Patter
The observer pattern is a software design pattern in which an object, called the subject, maintains a list of its dependents, known as observers, and notifie...
Spring Bean Scopes
Bean Scopes Define the Runtime Context Availability
Custom Assertions with AssertJ
You might have encountered tests that are difficult to read, especially when the failure messages are unclear. In such cases, consider creating your own spec...
What are benefits of testing?
Do I really need tests? Isn’t it a waste of time? These are questions you might have asked once or still find yourself asking. However, the answer is that te...
System Design
CAP Theorem
What is CAP theorem?
Defining Software Architecture
The software community has been engaged in a longstanding debate over how to define “architecture.” Some believe it refers to the underlying structure of a s...
Rate Limiting
Rate limiting is a pivotal technique employed to manage and control the number of incoming and outgoing requests interacting with a system. Not only does it ...
Polling And Streaming
In computing systems, the interaction between clients and servers is fundamental. This interaction often revolves around the client sending requests, and the...
Peer-To-Peer Networks
Introduction to Peer-To-Peer Networks
Leader Election
In most societies, citizens elect their leaders through a voting system. Similarly, in a distributed system, servers utilize a set of algorithms to select a ...
Replication And Sharding
The performance of a system often depends on the efficiency of its database. By optimizing the database, the system’s performance can be significantly improv...
Specialized Storage Paradigms
In addition to widely known SQL and NoSQL databases, such as document or key-value stores, there are specialized storage paradigms that are well-suited for s...
SQL vs NoSQL Databases
SQL vs NoSQL Databases: Understanding the Difference and When to Choose Each
Hashing
Hashing is a process that transforms an arbitrary piece of data into a fixed-size value, typically an integer. In the context of system design, this arbitrar...
Load Balancing
A load balancer can be better understood through a simple use case. Consider a basic client-server architecture where a client sends requests to a server, wh...
Proxies
Commonly utilized by malicious hackers to mask their identity and disguise their location, these distinct proxy servers also serve a variety of essential rea...
Caching
Caching is utilized to speed up a system and reduce or improve the latency of that system.
Availability
What is availability?
Latency And Throughput
Latency and throughput are the two most important measures of the performance of a system.
Network Protocols
What a protocol is?
Testing
Best Practices for Writing Effective and Reliable Tests
Many teams face a common challenge after introducing the practice of writing tests: builds take up to half an hour, refactoring tests prove to be difficult, ...
The Economics of Software Testing
The Importance of Software Testing in Business
Unraveling the Schools of Unit Testing: The Classic and London Approaches
There exist two major methodologies when it comes to unit testing. These methodologies guide how much to use mocks, stubs, and the special test implementatio...
Key Types of Testing in Software Development
Software testing is an integral part of the development process. Each type of testing has its specific purpose and helps ensure the highest quality of the fi...
Why Are Tests Essential?
Software testing is a fundamental aspect of any successful software development project. It is the process of examining a system or system component to deter...
System Quality
Best Practices for Writing Effective and Reliable Tests
Many teams face a common challenge after introducing the practice of writing tests: builds take up to half an hour, refactoring tests prove to be difficult, ...
The Economics of Software Testing
The Importance of Software Testing in Business
Unraveling the Schools of Unit Testing: The Classic and London Approaches
There exist two major methodologies when it comes to unit testing. These methodologies guide how much to use mocks, stubs, and the special test implementatio...
Key Types of Testing in Software Development
Software testing is an integral part of the development process. Each type of testing has its specific purpose and helps ensure the highest quality of the fi...
Why Are Tests Essential?
Software testing is a fundamental aspect of any successful software development project. It is the process of examining a system or system component to deter...
Data Structures
System Design Compendium
System design is a part of the system development process, focusing on the creation of a comprehensive blueprint for a system to satisfy specified requiremen...
Data Structures Compendium
Data structures can be seen as instrumental tools used to address a wide array of problems. They frequently encompass complex and mathematical concepts and c...
Principles
SOLID: The First 5 Principles of Object Oriented Design
SOLID is an acronym for the first five object-oriented design (OOD) principles by Robert C. Martin (also known as Uncle Bob).
Design patterns
Strategy Design Patter
Understanding and Implementing the Strategy Design Pattern
Concurrency
Java Synchronized vs Volatile
Execution Control and Memory Visibility