Introduction to the Disk Lru Cache framework in the Java class library

Introduction to the Disk Lru Cache framework in the Java class library introduction: In development, we often need to process a large amount of data, such as cache data required by network requests, picture cache, etc.In order to improve performance and reduce dependence on external resources, we need to cache these data to local disks.The Disk Lru Cache framework is a commonly used local disk cache solution in Java. In this article, we will briefly introduce the Disk Lru Cache framework and provide some Java code examples. 1. DISK LRU CACHE framework Overview: DISK LRU Cache is a local disk cache framework implemented based on LRU (Least Recently Use) algorithm for storage, reading and removing data.It stores data in the form of key value pairs, where the key is used to quickly find data, and the value represents the actual data content.The Disk Lru Cache framework makes full use of the storage space of the disk, divides the data into several file blocks, and records the location information of each file block through the index table.When you need to read the data, quickly locate the file block according to the index table and return the corresponding data. 2. Core category of DISK LRU CACHE framework: (1) Disklrucache: Disklrucache is the main entry class of the Disk Lru Cache framework, which is responsible for managing and operating the cache data on the disk.Using this class can realize the functions of cache data storage, reading, and removal. (2) Editor: Editor class is used to edit cache data, which provides a set of methods for setting the cache data and eventually submitted to the disk.During the editor, the cache data was unable to read. 3. Use examples: The following example demonstrates how to store and read the data of how to use the Disk Lru Cache framework: (1) Initialize DiskLRUCACHE object: File cacheDir = new File("path/to/cache/directory"); int appVersion = 1; int valueCount = 1; long maxsize = 10 * 1024 * 1024; // The maximum cache size is 10MB DiskLruCache diskLruCache = DiskLruCache.open(cacheDir, appVersion, valueCount, maxSize); (2) Storage data to cache: String key = "my_key"; Editor editor = diskLruCache.edit(key); OutputStream outputStream = editor.newOutputStream(0); String data = "Hello, Disk LRU Cache!"; outputStream.write(data.getBytes()); outputStream.close(); editor.commit(); (3) Read the data from the cache: String key = "my_key"; Snapshot snapshot = diskLruCache.get(key); InputStream inputStream = snapshot.getInputStream(0); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); String data = reader.readLine(); reader.close(); snapshot.close(); System.out.println ("read data:" + data); (4) Remove the cache data: String key = "my_key"; diskLruCache.remove(key); 4. Summary: This article briefly introduces the Disk Lru Cache framework in the Java class library, which provides a solution to achieve a local disk cache.By using the Disk Lru Cache framework, we can easily store data to the disk and read and remove operations when needed.In actual development, we can optimize the performance and resource utilization rate of the application according to specific needs.