How to use caching technology to improve the performance of Java functions?

By using caching technology, Java function performance can be effectively improved: caching technology reduces calls to underlying storage by storing recently accessed data. Caching libraries available in Java include Caffeine, Guava, and Ehcache. Caffeine is suitable for high-concurrency applications, Guava provides easy cache creation, and Ehcache is suitable for large applications that require scalable cache. Using Caffeine caching, you can significantly improve application performance by reducing the number of database accesses.

How to use caching technology to improve the performance of Java functions

Caching technology is an effective strategy that can be used to store recently accessed data to improve the performance of Java functions, thereby reducing access to the underlying storage. In Java, various caching libraries are available such as Caffeine, Guava, and Ehcache.

Caffeine

Caffeine is a high-performance, thread-safe cache library ideal for applications requiring high concurrency. It provides various caching strategies, such as:

• Strong reference cache: always stores the value, even if it is not accessed.
• Soft reference cache: Values ​​can be cleared when the JVM encounters memory limits.
• Weak reference cache: The value will be cleared at the next GC.

Caffeine<String, String> cache = Caffeine.newBuilder()
    .expireAfterWrite(10, TimeUnit.MINUTES)
    .build();

String value = cache.getIfPresent("key");
if (value == null) {
    // 从数据库获取值
    value = loadFromDB("key");
    cache.put("key", value);
}

Guava

Guava is also a popular caching library that provides an easy way to create caches. Guava has fewer caching features than Caffeine, but it's easier to use.

CacheBuilder<String, String> cache = CacheBuilder.newBuilder()
    .expireAfterWrite(10, TimeUnit.MINUTES)
    .build();

String value = cache.getIfPresent("key");
if (value == null) {
    // 从数据库获取值
    value = loadFromDB("key");
    cache.put("key", value);
}

Ehcache

Ehcache is an enterprise-level caching library that provides various features such as persistence, distributed support, and off-heap memory. It is suitable for large applications that require a scalable caching solution.

CacheManager cacheManager = new CacheManager();
Cache cache = cacheManager.getCache("myCache");

String value = cache.get("key");
if (value == null) {
    // 从数据库获取值
    value = loadFromDB("key");
    cache.put("key", value);
}

Practical case

The following is a simple Java function that uses Caffeine cache to improve performance:

import com.github.benmanes.caffeine.cache.Caffeine;

public class CachingJavaFunction {

    private static Caffeine<String, String> cache = Caffeine.newBuilder()
        .expireAfterWrite(10, TimeUnit.MINUTES)
        .build();

    public static String getCachedValue(String key) {
        String value = cache.getIfPresent(key);
        if (value == null) {
            // 从数据库获取值
            value = loadFromDB(key);
            cache.put(key, value);
        }
        return value;
    }
}

Using this function, you can Database accesses are reduced to a minimum, significantly improving application performance.

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