flutter_disk_lru_cache

Description:

flutter disk lru cache

flutter_disk_lru_cache #
Dart version based on Android disk LRU cache migration The source code comes
from android disk LRU cache

Usage #
To use this plugin, follow
the installing guide.
Example #
import 'package:flutter/material.dart';
import 'package:crypto/crypto.dart';
import 'package:path_provider/path_provider.dart';
import 'package:flutter_disk_lru_cache/flutter_disk_lru_cache.dart';

void main() async {
WidgetsFlutterBinding.ensureInitialized();
Directory? tempDirectory = await getTemporaryDirectory();
if (tempDirectory == null) {
return;
}

/// init
DiskLruCache diskLruCache = await DiskLruCache.open(tempDirectory!, valueCount: "file version nums",version: "1.0.0" ,maxSize: 20 * 10274 * 1024 (20m));

/// key name
final String key = md5.convert(utf8.encode("https://xxxxx.com/xxx.png")).toString();

/// write data to disk cache
Editor? editor = await diskLruCache.edit(key);
if (editor == null) {
throw Exception("editor is null");
}

/// request image uint8List
final Uint8List imageBytes = await getImageUintList();

/// open io stream
FaultHidingIOSink faultHidingIOSink = editor.newOutputIOSink(0);

/// write uint8List to disk,but it is dirty,is not commited
await faultHidingIOSink.writeBytes(imageBytes);

/// write text to disk,but it is dirty,is not commited
await faultHidingIOSink.write("text");

/// flush io
await faultHidingIOSink.flush();

/// close the io stream
await faultHidingIOSink.close();

/// comfirm commit
await editor.commit(diskLruCache);

/// cancel commit
await editor.abort(diskLruCache);

/// get cache file information
Snapshot? snapshot = await editor.get(key);

/// request to valueCount version
RandomAccessFile inV1 = snapshot.getRandomAccessFile(0);
Uint8List bytes = inV1.readSync(snapshot.getLengths(0));

/// bytes to text
String text = utf8.decode(bytes);

/// close snapshot
snapshot.close();

/// edit snapshot
Editor? editor = await diskLruCache.edit(snapshot.key,sequenceNumber: snapshot.sequenceNumber);

/// remove cache
await diskLruCache.remove(key);

/// flush cache
await diskLruCache.flush();

/// close disk cache
await diskLruCache.close();

/// Closes the cache and deletes all of its stored values. This will delete
/// all files in the cache directory including files that weren't created by the cache.
await diskLruCache.delete();
}
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