Context Manager

This project demonstrates a simple context management system using JavaScript. It allows you to create contexts, bind values to keys within those contexts, and retrieve those values within a handler function.

Overview

The main components of this example are:

• Context Creation: You can create a new context using Context.createContext().
• Binding Values: Values can be bound to keys in the context using the bind method.
• Retrieving Values: Values can be retrieved using the get method within a handler function that has access to the context.
• Context Isolation: The context is isolated to the handler, meaning that accessing the context outside of the handler will return undefined.

How to Use

0. Import the Context Module:

   import Context from 'the-context-js';
   // OR ||
   const { default: Context } = require("the-context-js");

1. Create a Context: Use Context.createContext() to create a new context instance.

   const theContext = Context.createContext();

2. Bind Values: Use the bind method to associate keys with values in the context.

   theContext.bind("key1", "value1");
   theContext.bind("key2", "value2");

3. Define a Handler: Create a function that retrieves values from the context.

   const theHandler = function() {
   const theContext = Context.getContext();
   const key2 = theContext.get("key2");
   console.log(key2); // Outputs: value2
   };

4. Create a New Handler with Context: Use containerWithContext to create a new handler that has access to the context.

   const newHandler = theContext.containerWithContext(theHandler);
   newHandler(); // Call the handler with context

5. Call the Handler Without Context: If you call the handler directly without context, it will not have access to the bound values.

   theHandler(); // Outputs: undefined

6. Global Context Access: Attempting to access the context globally will return undefined.

   const anotherContext = Context.getContext(); // This will be undefined
   console.log('GLOBAL: anotherContext', anotherContext); // Outputs: undefined

Benchmark

• Run a benchmark: node --expose-gc benchmark.js

Last Reports:
Context.createContext: 1.625 ms, 1000 iterations, 615498.25 ops, Total Memory: 42544.00 KB
Context.getContext: 0.581 ms, 1000 iterations, 1720282.13 ops, Total Memory: 43412.88 KB
Context.bind: 0.845 ms, 1000 iterations, 1183431.95 ops, Total Memory: 43998.81 KB
Context.get: 0.253 ms, 1000 iterations, 3955696.20 ops, Total Memory: 44259.15 KB
Context.unbind: 0.342 ms, 1000 iterations, 2924831.82 ops, Total Memory: 44528.48 KB

Debugging

• Monitor Contexts: node debug.js

Commands:

1. create sampleContext --> ID: 18
2. bind key value 18
3. get all
4. get 18