Computer Science and Programming

2024-03-10 18:28:24 UNTANGLE Spring Security Architecture

Authentication and Authorization:
- Validates user identity and orchestrates controlled resource access.
- Empowers comprehensive user authentication and nuanced authorization.

Security Filters:
- Intercepts incoming requests, meticulously enforcing security measures.
- Offers a flexible, layered security filter chain for diverse protection strategies.

Custom Authentication Providers:
- N Authentication Provider: Extends authentication capabilities beyond default configurations. Facilitates tailored authentication strategies and seamless integration.
- DaoAuthentication Provider: Adopts a database-backed approach for user authentication. Scrutinizes user credentials against stored records, heightening security.

Authentication Manager:
- Orchestrates the authentication process, coordinating various authentication providers.
- Serves as a pivotal component in managing user identity verification.

Token-based Security (JWT):
- Implements advanced token-based authentication for stateless communication.
- Facilitates secure interaction without the need for server-side storage.

Session Management:
- Efficiently manages user sessions, mitigating session-related risks.
- Provides adaptability for session creation, tracking, and invalidation.

Authentication Tokens:
- Username Password Authentication Token:Represents user credentials for authentication purposes.
- Leverages usernames and passwords for robust user verification.

Add/Remove Authentication Token:
- Dynamically enables the addition and removal of authentication tokens.
- Ensures real-time control over user authentication, promoting flexibility. Open / Comment

2024-03-07 13:03:57 DevOps Explained!

Plan:
- Defines project goals, scope, and requirements, identifying stakeholders and resources.
Build:
- Involves coding, compiling, and packaging, emphasizing version control and code management.
Test:
- Ensures software aligns with quality and functional standards, utilizing automated and security testing.
Deploy:
- Releases software precisely using deployment automation and monitoring tools.
Operate:
- Ensures operational stability, promptly addressing issues with management tools.
Observe:
- Analyzes data from software and production using logging, tracing, and metrics tools.
Continuous Feedback:
- Gathers ongoing feedback, utilizing loops, surveys, and analytics for improvement.
DevOps:
- Cultivates a culture of collaboration, communication, and continuous improvement for faster, better, and safer software delivery. Open / Comment

2024-03-05 12:12:57 How Git Works - From Working Directory to Remote Repository

[1]. Working Directory:
Your project starts here. The working directory is where you actively make changes to your files.
[2]. Staging Area (Index):
After modifying files, use git add to stage changes. This prepares them for the next commit, acting as a checkpoint.
[3]. Local Repository:
Upon staging, execute git commit to record changes in the local repository. Commits create snapshots of your project at specific points.
[4]. Stash (Optional):
If needed, use git stash to temporarily save changes without committing. Useful when switching branches or performing other tasks.
[5]. Remote Repository:
The remote repository, hosted on platforms like GitHub, is a version of your project accessible to others. Use git push to send local commits and git pull to fetch remote changes.
[6]. Remote Branch Tracking:
Local branches can be set to track corresponding branches on the remote. This eases synchronization with git pull or git push. Open / Comment

2024-03-03 14:45:29 Computer Memory Explained

Computer memory is like a workspace for your computer. It stores data and instructions that the computer needs to access quickly.

Internal Memory:

1. ROM (Read-Only Memory):
- PROM (Programmable ROM): Programmable once by the user post-manufacturing.
- EPROM (Erasable Programmable ROM): Can be erased with ultraviolet light and reprogrammed.
- EEPROM (Electrically Erasable Programmable ROM): Can be erased and reprogrammed electrically, multiple times.

2. RAM (Random Access Memory):
- SRAM (Static RAM): Retains data as long as power is supplied, no need to refresh, faster than DRAM.
- DRAM (Dynamic RAM): Stores data in capacitors that must be refreshed periodically, widely used.
- SDRAM (Synchronous DRAM): Syncs with CPU clock speed for improved performance.
- RDRAM (Rambus DRAM): High bandwidth memory with Rambus technology.
- DDR SDRAM (Double Data Rate SDRAM): Transfers data on both rising and falling clock edges.
- DDR1: First generation, higher speed and bandwidth than SDRAM.
- DDR2: Improved version of DDR1 with lower power consumption and higher speeds.
- DDR3: Higher speeds and reduced power consumption over DDR2.
- DDR4: Higher module density and increased performance with reduced voltage.

External Memory:

1. HDD (Hard Disk Drive): Uses spinning disks to read/write data, traditional storage device.
2. SSD (Solid State Drive): Non-volatile flash memory for faster speed than HDDs.
3. CD (Compact Disc): Optical disc for storing digital data, used for music and software Open / Comment

2024-03-01 16:13:59 DevOps is a set of practices that combines software development and IT operations. It aims to shorten the software development life cycle and provide continuous delivery with high software quality.

DevOps has several phases

Plan: This phase involves defining the goals, scope, and requirements of the software project. It also includes identifying the stakeholders, risks, and resources needed.

Build: This phase involves writing, compiling, and packaging the code into executable units. It also includes using version control, code review, and configuration management tools.

Test: This phase involves verifying that the software meets the quality standards and functional specifications. It also includes using automated testing, performance testing, and security testing tools.

Deploy: This phase involves releasing the software to the production environment or to the end-users. It also includes using deployment automation, orchestration, and monitoring tools.

Operate: This phase involves running and maintaining the software in the production environment. It also includes using incident management, problem management, and change management tools.

Observe: This phase involves collecting and analyzing data from the software and the production environment. It also includes using logging, tracing, and metrics tools.

Continuous Feedback and Discovery: This phase involves gathering feedback from the stakeholders, users, and customers. It also includes using feedback loops, surveys, and analytics tools. It also involves discovering new opportunities, challenges, and trends.

DevOps is a culture that promotes collaboration, communication, and continuous improvement. It helps to deliver software faster, better, and safer. Open / Comment

2024-02-27 13:19:59 18 Most common used Java List methods

1. add(E element) - Adds the specified element to the end of the list.
2. addAll(Collection c) - Adds all elements of the specified collection to the end of the list.
3. remove(Object o) - Removes the first occurrence of the specified element from the list.
4. remove(int index) - Removes the element at the specified position in the list.
5. get(int index) - Returns the element at the specified position in the list.
6. set(int index, E element) - Replaces the element at the specified position in the list with the specified element.
7. indexOf(Object o) - Returns the index of the first occurrence of the specified element in the list.
8. contains(Object o) - Returns true if the list contains the specified element.
9. size() - Returns the number of elements in the list.
10. isEmpty() - Returns true if the list contains no elements.
11. clear() - Removes all elements from the list.
12. toArray() - Returns an array containing all the elements in the list.
13. subList(int fromIndex, int toIndex) - Returns a view of the portion of the list between the specified fromIndex, inclusive, and toIndex, exclusive.
14. addAll(int index, Collection c) - Inserts all elements of the specified collection into the list, starting at the specified position.
15. iterator() - Returns an iterator over the elements in the list.
16. sort(Comparator c) - Sorts the elements of the list according to the specified comparator.
17. replaceAll(UnaryOperator operator) - Replaces each element of the list with the result of applying the given operator.
18. forEach(Consumer action) - Performs the given action for each element of the list until all elements have been processed or the action throws an exception.

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Open / Comment

2024-02-23 14:23:33 Ever wondered how Docker works?

1. Docker Build
2. Docker Push
3. Docker Run
4. Docker Pull
5. Docker Images Open / Comment

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2024-02-20 20:29:37 If you design complex systems, you'll love sequence diagrams

Complex system architectures can quickly become tangled and hard to follow. Enter sequence diagrams! They keep your design neat and easily understandable.

For example, check out the diagram below. It depicts a client/server interaction, clearly differentiating between a cache hit and a cache miss. This is a prime example of how visual aids simplify complex interactions.

Sequence diagrams are a must when you aim to:

- Map out end-to-end system workflows.
- Clarify interactions between components.
- Produce clear and concise documentation.
- Identify design flaws.

I have two favorites for creating sequence diagrams. WebSequenceDiagrams and Mermaid (links in comment). You can make sequence diagrams easily with just text.

Do you have a go-to tool for crafting good-looking sequence diagrams? Drop your suggestions below! Open / Comment