cache_service 1.0.3

Cache Service is a Flutter package that efficiently caches images and PDFs, including in-memory caching, to reduce load times and resource use for a smoother app experience.

Cache Service

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Cache Service is a powerful Flutter package designed to simplify and optimize the caching and display of images and PDFs in your applications. With its robust caching strategies, including in-memory cache management and customizable settings, Cache Service helps reduce loading times, network requests, and resource usage, resulting in a seamless user experience.

Features

• CachedImage Widget: Display images with built-in caching to reduce loading times and network requests.
• CachedPDF Widget: Display PDF files with caching support, ensuring fast loading and offline access.
• In-Memory Cache: Efficiently stores assets in RAM for rapid access and reduced loading times.
• Customizable Cache Settings: Easily configure cache size, expiration policies, and more to fit your app's needs.
• Shimmer Effect Support: Provides a shimmer effect while loading assets, offering a smooth user experience.

Installation

Add the package to your pubspec.yaml file:

dependencies:
  cache_service: 1.0.1

Then, run:

flutter pub get

Usage:

main.dart

In main.dart initialize CacheService:

void main() async {
  CacheService cacheService = CacheService();
  await cacheService.initialize();
  runApp(const MyApp());
}

alternatively,

To override the default properties of the cache service, you can customize settings such as cache size, expiration policies, and more by configuring the package's settings.

void main() async {
  CacheService cacheService = CacheService();
  await cacheService.initialize(
      cacheConfig: CacheConfig(
    cleanupPeriod: const Duration(days: 10),
    maxAge: const Duration(days: 14),
    maxFileSizeBytes: 1024 * 1024 * 10, //indicating, 10 MB
    maxCacheSizeBytes: 1024 * 1024 * 50, //indicating, 50 MB
    maxRetries: 3,
  ));
  runApp(const MyApp());
}

CachedImage Widget

The CachedImage widget makes it easy to display and cache images from the internet.

import 'package:cache_service/cache_service.dart';

CachedImage(
  imageUrl: 'https://example.com/image.jpg',
);

CachedPDF Widget

Use the CachedPDF widget to display and cache PDF files, reducing load times and network usage.

import 'package:cache_service/cache_service.dart';

CachedPDF(
    pdfUrl: 'https://example.com/sample.pdf',
);

Clearing cache

import 'package:cache_service/cache_service.dart';

InkWell(
    onTap: () {
    //clearing cache; this will clear all local cache (excluding in-memory cache)
    CacheService().clearCache();
    },
    child: const Text(
        'Clear cache',
        ),
    ),

Preload cache

This function CacheService().preloadImageResources(['urls']) can be used to pre load images, which are going to be used later. This helps in improving customer experience.

import 'package:cache_service/cache_service.dart';

InkWell(
    onTap: () {
     CacheService().preloadImageResources(['url1', 'url2']);
    },
    child: const Text(
        'preload cache',
        ),
    ),

---

In-memory cache

It is designed to manage in-memory caching. It allows efficient storage, retrieval, updating, and removal of cached items using a unique identifier. This service simplifies the management of in-memory data, making it easier to work with frequently accessed information and improving performance by reducing redundant operations.

Adding Items

Use the addItem method to add a new item to the cache.

CacheService().addItem({'id': 'item1', 'data': 'some data'});

Retrieving Items

To retrieve an item from the cache by its ID:

Map<String, dynamic>? item = CacheService().getItem('item1');

Checking Item Existence

Check if an item exists in the cache:

bool exists = CacheService().containsItem('item1');

Updating Items

Update an existing item in the cache. The item must contain the same 'id' key as the one to be updated.

CacheService().updateItem({'id': 'item1', 'data': 'updated data'});

Removing Items

Remove an item from the cache by its ID:

bool removed = CacheService().removeItemFromMemory('item1');

Clearing Cache

Clear all items from the cache:

CacheService().clearCacheFromMemory();

Accessing All Cached Items

Retrieve a list of all items currently stored in the cache:

List<Map<String, dynamic>> allItems = CacheService().memoryCache;

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Example

For a complete example, check out the example directory, which demonstrates how to use the CacheService() in a real-world scenario.

Contributing

Contributions are welcome! If you have any ideas, suggestions, or issues, feel free to open an issue or a pull request on GitHub.

License

This project is licensed under the 3-Clause BSD License - see the LICENSE file for details.

Support

If you find this package useful, please consider giving it a star on GitHub. Your support is appreciated!