Enhanced KeyValueStore with Query Caching and Demo Integration

[GoogolC]

This PR enhances the KeyValueStore functionality and aligns it better with Lynx's architecture by introducing query caching capabilities and a demo project for showcasing usage.

---

Changes

This PR enhances the KeyValueStore functionality and aligns it better with Lynx's architecture by introducing query caching capabilities and a demo project for showcasing usage.

Key Changes

1. Enhanced KeyValueStore:

   • Added support for caching database query results:
     • cacheQueryResult(query: String, result: String): Stores a query result with a unique key.
     • getCachedResult(query: String): Option[String]: Retrieves cached query results.
   • Retains functionality for reading and writing key-value pairs:
     • read(): Reads all key-value pairs from a file.
     • write(data: Map[String, String]): Writes key-value pairs to a file.
     • append(key: String, value: String): Appends a single key-value pair.

2. Demo Project (demo/src/main/scala/DemoKeyValueStoreApp.scala):

   • Demonstrates real-world usage of KeyValueStore:
     • Writing and reading key-value pairs.
     • Caching and retrieving database query results.
   • Includes meaningful examples such as simulating query result caching in a database system.

3. Unit Testing (demo/src/test/scala/DemoKeyValueStoreTest.scala):

   • Comprehensive tests for:
     • Writing and reading key-value pairs.
     • Caching and retrieving query results.
   • Ensures the correctness and stability of all methods.

---

Features

• File-Based Key-Value Storage:
  • Simple and intuitive file-based storage for key-value pairs.
• Query Caching:
  • Cache query results for repeated use, improving efficiency.
• Demo and Tests:
  • Provides a clear demonstration of how to use KeyValueStore effectively.
  • Fully tested to ensure reliability.

---

Test Plan

How to Test

1. Run the Demo:

   • Navigate to the repository's root directory and compile the code:

     scalac -d out demo/src/main/scala/DemoKeyValueStoreApp.scala src/main/scala/org/grapheco/lynx/KeyValueStore.scala

   • Execute the demo application:

     scala -cp out demo.DemoKeyValueStoreApp

   • Expected Output:

     === Demo: KeyValueStore ===
     
     Writing key-value pairs...
     
     Reading key-value pairs...
     user1 -> Alice
     user2 -> Bob
     
     Caching a query result...
     
     Retrieving cached query result...
     Cached result for query: [{'name':'Alice'}, {'name':'Bob'}]
     

2. Run Unit Tests:

   • Compile and run the test file:

     scalac -d out demo/src/test/scala/DemoKeyValueStoreTest.scala src/main/scala/org/grapheco/lynx/KeyValueStore.scala
     scala -cp out demo.DemoKeyValueStoreTest

   • Expected Output:

     Testing append()...
     Testing read()...
     Testing cacheQueryResult()...
     Testing getCachedResult()...
     All tests passed!
     

---

Future Improvements

• Extend KeyValueStore to handle more complex caching policies (e.g., TTL for cached data).
• Introduce configurable file paths and better error handling for edge cases.
• Explore integration with Lynx's core architecture, making KeyValueStore an optional utility.

---

Why This PR?

This PR is aligned with feedback suggesting a transformation of KeyValueStore into a demonstration project. By integrating query caching functionality and providing a clear demo with unit tests, this PR illustrates how KeyValueStore can be a useful utility in a Lynx ecosystem or as an independent module.

---

Summary

This PR introduces:

• An enhanced KeyValueStore with query caching capabilities.
• A demo project illustrating practical use cases.
• Comprehensive test coverage for all implemented features.

I believe this contribution can serve as a valuable demonstration of KeyValueStore's potential and its application in real-world scenarios.

---

[GoogolC]

From Googolc Team

[HC-teemo]

Great PR. but, in fact, Lynx does not need a storage layer. If used as an adapter, it probably needs better designing, and more testing.

[excelwang]

Authors of this pr could consider making the code to be a demo project using lynx.

[GoogolC]

I have addressed the feedback by transforming KeyValueStore into a standalone demo project, better aligning with Lynx's architecture. This update includes restructuring the code, enhancing functionality with query caching, adding comprehensive unit tests, and providing a practical demo application to showcase its usage in real-world scenarios.
Please let me know if further refinements are required. Thank you for your valuable feedback!

[GoogolC]

I have addressed the feedback by transforming KeyValueStore into a standalone demo project, better aligning with Lynx's architecture. This update includes restructuring the code, enhancing functionality with query caching, adding comprehensive unit tests, and providing a practical demo application to showcase its usage in real-world scenarios. Please let me know if further refinements are required. Thank you for your valuable feedback!

…

---- Replied Message ---- | From | Huajin ***@***.***> | | Date | 01/07/2025 11:05 | | To | ***@***.***> | | Cc | ***@***.***>***@***.***> | | Subject | Re: [lynxworld/lynx] Add KeyValueStore with basic read/write functionality and tests (PR #145) | Authors of this pr could consider making the code to be a demo project using lynx. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[GoogolC]

Great PR. but, in fact, Lynx does not need a storage layer. If used as an adapter, it probably needs better designing, and more testing.

I have addressed the feedback by transforming KeyValueStore into a standalone demo project, better aligning with Lynx's architecture. This update includes restructuring the code, enhancing functionality with query caching, adding comprehensive unit tests, and providing a practical demo application to showcase its usage in real-world scenarios.
Please let me know if further refinements are required. Thank you for your valuable feedback!