node-redlock/docs/RedisJsClient.ts.md

A distributed locking algorithm used to manage distributed resources in a system.

 Introduction and Overview
------------------------------

The code in the file `RedisJsClient.ts` is a TypeScript implementation of a Redis client for JavaScript applications. The class `RedisjsClient` implements the interface `RedisClient` and provides methods to interact with a Redis database, specifically to perform the `set` and `eval` commands.

System Architecture
-------------------------

The system architecture consists of the following components:

1. **Redis Client**: The class `RedisjsClient` that implements the interface `RedisClient` and provides methods for interacting with a Redis database.
2. **Redis Database**: The external service or library used to store and retrieve data using the commands provided by the `RedisjsClient`.

Data Design
---------------------

The `RedisjsClient` class uses the following types:

* `RedisClientType`: A type that represents the client used to interact with the Redis database. This could be an instance of a Redis client library such as `redis` or `ioredis`.
* `RedisClient`: An interface that defines the methods for interacting with a Redis database. The class `RedisjsClient` implements this interface and provides its own implementation of these methods.

Interface Design
--------------------------

The class `RedisjsClient` implements the interface `RedisClient`, which defines the following method signatures:

* `set(key: string, value: string, options?: { NX: boolean; PX?: number }): Promise<string | null>`: This method sets a key-value pair in the Redis database with optional expiration settings.
* `eval(script: string, keys: string[], args: string[]): Promise<number>`: This method evaluates a Lua script on the server and returns the number of affected elements.

Component Design
------------------------

The class `RedisjsClient` is the only component in this codebase. It is responsible for providing methods to interact with a Redis database using the provided client library.

User Interface Design
---------------------------

There is no user interface in this codebase, as it is focused on providing methods for interacting with a Redis database rather than presenting data to a user.

Assumptions and Dependencies
-------------------------------

The class `RedisjsClient` assumes that the client library used to interact with the Redis database provides support for the `set` and `eval` commands. The code does not explicitly state this, but it is implied by the method signatures provided.

There are no other dependencies listed in the code. It is assumed that the necessary client library has been installed and imported into the project.

Glossary of Terms
----------------------

* **Redis Client**: The class `RedisjsClient` that provides methods for interacting with a Redis database.
* **Redis Database**: The external service or library used to store and retrieve data using the commands provided by the `RedisjsClient`.
* **Interface**: A type definition in TypeScript that defines the structure of an object, including its properties, methods, and types.
* **Promise**: An object that represents a value that may not be available yet, but will be resolved at some point in the future.

Class Diagram (in Mermaid syntax)
--------------------------------------

```mermaid
class RedisClient {
  constructor(client: RedisClientType) {}

  set(key: string, value: string, options?: { NX: boolean; PX?: number }): Promise<string | null>

  eval(script: string, keys: string[], args: string[]): Promise<number>
}

class RedisClientType {
  // External client library used to interact with the Redis database.
}
```