Unlock the Power of `lock-defer` – Comprehensive Guide with API Examples

Introduction:

The `lock-defer` is a powerful utility module that helps developers manage asynchronous code execution effectively. By deferring the execution of certain locks, the module allows enhanced control over resource management. This guide gives an in-depth look at the `lock-defer` functionalities, presenting useful API explanations along with illustrative code snippets.

1. Initialization

To get started, initialize the `lock-defer` module:

  const lockDefer = require('lock-defer');

2. Creating a Lock

To create a lock:

  const myLock = lockDefer.createLock('myLock');

3. Acquiring a Lock

Acquire a lock to perform an operation:

  myLock.acquire(() => {
    // Perform your operations here...
    console.log('Lock acquired');
  });

4. Deferring an Operation

Defer a function to be executed later:

  myLock.defer(() => {
    console.log('This will run after the lock is released.');
  });

5. Releasing a Lock

Release a lock after the operation is completed:

  myLock.release(() => {
    console.log('Lock released');
  });

6. Using Callbacks

Creating a lock with a callback:

  myLock.acquire(() => {
    console.log('Perform some operations here...');
    myLock.release(() => {
      console.log('Lock operation completed.');
    });
  });

7. Handling Errors

Properly handle errors during lock operations:

  myLock.acquire(() => {
    try {
      // Perform critical operations
      throw new Error('Something went wrong!');
    } catch (error) {
      console.error('Caught an error:', error);
    } finally {
      myLock.release();
    }
  });

8. Full Application Example

Below is a simple application using the discussed `lock-defer` APIs:

  const lockDefer = require('lock-defer');
  
  const readLock = lockDefer.createLock('read');
  const writeLock = lockDefer.createLock('write');
  
  function readOperation() {
    readLock.acquire(() => {
      console.log('Reading...');
      setTimeout(() => {
        console.log('Read complete');
        readLock.release();
      }, 1000);
    });
  }
  
  function writeOperation() {
    writeLock.acquire(() => {
      console.log('Writing...');
      setTimeout(() => {
        console.log('Write complete');
        writeLock.release();
      }, 1000);
    });
  }
  
  readOperation();
  writeOperation();

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