Ehcache caching technology in Java

With the rapid development of the Internet and mobile Internet, various big data and high-concurrency scenarios have become more common, which makes caching an indispensable technology. In Java development, Ehcache is a commonly used caching technology.

What is Ehcache?
Ehcache is an open source pure Java cache library that can use disk or memory as cache storage medium and supports distributed cache and cache clusters. It can store data in the cache without affecting application performance, thus avoiding frequent reading of data from the database or hard disk, greatly improving application performance.

Advantages of Ehcache:

1. Fast speed: Ehcache caches data in memory, so it has fast read and write speeds and has good support for high-concurrency systems.
2. Easy to use: Ehcache provides rich API and configuration, allowing developers to easily integrate it into applications.
3. High availability: Ehcache supports distributed caching and can run on multiple servers simultaneously, improving application availability.
4. Easy to expand: Ehcache can be used in conjunction with other caching technologies (such as Redis and Memcached), making the cache more flexible and scalable.

Usage of Ehcache:

1. Introduce Ehcache dependency files: Manage dependencies through Maven, and add Ehcache dependencies in pom.xml.
2. Write Ehcache configuration file: You can use XML or YAML files to configure Ehcache. Parameters such as cache name, maximum number of elements, expiration time, persistence strategy, etc. can be configured.
3. Create CacheManager: Create a CacheManager in Java code. This object is responsible for cache creation, destruction and access.
4. Create cache: Create a Cache object in CacheManager to represent a cache instance.
5. Storing and reading data: Write and read data in Cache. If the data already exists in the cache, return the cached data directly. Otherwise, read the data from the database or other storage media and store it. Stored in cache.

Notes on Ehcache:

1. Selection of cache strategy: The cache strategy should be selected based on the actual scenario, such as whether a persistent cache needs to be used.
2. Memory usage: Ehcache cache data is stored in memory, so you need to pay attention to the size and usage of memory to prevent memory overflow.
3. Multi-thread concurrency issues: Ehcache may have the risk of multi-thread concurrent access, so you need to pay attention to thread safety issues.

In short, Ehcache is a mature, stable, easy-to-use caching technology that has been widely used in big data and high concurrency scenarios. Java developers should be familiar with and master the use of Ehcache to improve application performance and availability.

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