Async Hooks API Documentation

This documentation provides an overview of the async_hooks module in version 14.x of our API. The async_hooks module is designed to help developers trace asynchronous operations in their applications.

Overview

The async_hooks module provides a way to track asynchronous operations such as callbacks, promises, and timers. It allows you to:

• Register callbacks for different types of asynchronous operations.
• Get information about the current execution context.
• Manage asynchronous resources.

Features

• Context Tracking: Track the context of asynchronous operations.
• Resource Management: Manage resources used by asynchronous operations.
• Error Handling: Capture errors from asynchronous operations.

Usage

To use the async_hooks module, you need to:

1. Import the Module: const async_hooks = require('async_hooks');
2. Create an AsyncHook: const hook = async_hooks.createHook({});
3. Register the Hook: hook.enable();
4. Implement Callbacks: Implement callbacks for different types of asynchronous operations.

Examples

Here's a simple example of how to use the async_hooks module:

const async_hooks = require('async_hooks');
const fs = require('fs');

const hook = async_hooks.createHook({
  init(asyncId, type, triggerAsyncId, resource) {
    console.log(`Async operation initiated: ${type}`);
  },
  before(asyncId) {
    console.log(`Async operation started: ${asyncId}`);
  },
  after(asyncId) {
    console.log(`Async operation completed: ${asyncId}`);
  },
  destroy(asyncId) {
    console.log(`Async operation destroyed: ${asyncId}`);
  }
});

hook.enable();

fs.readFile('example.txt', (err, data) => {
  if (err) throw err;
  console.log(data.toString());
});

Further Reading

For more detailed information, please refer to the official documentation.

JavaScript