Summary

The DownloadManager class is responsible for managing download tasks. It uses the Helpers class to handle file-related operations and the async library for task queuing and concurrency control.

Example Usage

const downloadManager = new DownloadManager(3); // Create a new DownloadManager with a concurrency of 3
downloadManager.enqueueItem({ url: 'https://example.com/file1', directory: './downloads', fileName: 'file1.txt' }); // Enqueue a download task
downloadManager.enqueueItem({ url: 'https://example.com/file2', directory: './downloads', fileName: 'file2.txt' });
downloadManager.start(); // Start the download tasks
downloadManager.onProgress((progress) => {
  console.log(`Download progress: ${progress.percentage}%`);
});
downloadManager.onComplete(() => {
  console.log('All downloads completed');
});

Code Analysis

Main functionalities

• Manages download tasks, including starting, pausing, resuming, and canceling tasks.
• Uses the Helpers class to handle file-related operations.
• Uses the async library for task queuing and concurrency control.
• Emits events for progress and completion of downloads.

Methods

• constructor(concurrency: number = 1, displayLog: boolean = false): Initializes a new instance of the DownloadManager class with the specified concurrency and display log settings.
• start(): Starts the download tasks.
• pause(): Pauses the download tasks.
• resume(): Resumes the download tasks.
• cancel(): Cancels the download tasks.
• enqueueItem(item: DownloadItem): Enqueues a download task.
• onProgress(callback: (progress: DownloadProgress) => void): Registers a callback function to be called when a progress event is emitted.
• onError(callback: (error: Error, task: DownloadItem) => void): Registers a callback function to be called when an error event is emitted.
• onComplete(callback: () => void): Registers a callback function to be called when a complete event is emitted.
• queueCount(): Returns the number of tasks in the task queue.
• queueStatus(): Returns the current status of the download stream.

Fields

• queue: An instance of the async.QueueObject class from the async library, used for task queuing and concurrency control.
• status: The current status of the download tasks.
• helper: An instance of the Helpers class, used for file-related operations.
• _displayLog: A boolean flag indicating whether to display log messages.

Dependencies

• async: Async is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript.
• axios: Promise based HTTP client for the browser and node.js

Contributing

Please make sure to read the Contributing Guide before making a pull request.

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License

MIT © Heliomar P. Marques 🔝