Application of caching mechanism in Java framework performance optimization

The caching mechanism is widely used in Java frameworks and can significantly improve performance, including: reducing the number of database accesses and speeding up response times. Improve system throughput and handle more requests. Reduce system load and reduce server pressure.

Application of caching mechanism in Java framework performance optimization

Introduction

The caching mechanism is a technology widely used in computing systems to improve performance. It can reduce the number of times the system reads the data source by storing frequently accessed data, thereby improving response time and throughput. In the Java framework, the caching mechanism can be applied to various scenarios such as database queries, HTTP requests, page fragments, etc., greatly improving the overall performance of the framework.

Caching mechanism type

In the Java framework, commonly used caching mechanism types are:

• Local cache: Stored in JVM memory, the access speed is the fastest, but it is limited by the memory size.
• Distributed cache: Stored in a distributed system (such as Redis, Memcached), the capacity is larger, and the access speed is between the local cache and the database.
• Page cache: Stored in the operating system page cache, usually used to cache file contents in the file system.

Practical case

The following is a practical case using the Caffeine library to implement local caching:

import com.github.benmanes.caffeine.cache.Cache;
import com.github.benmanes.caffeine.cache.Caffeine;
import java.util.concurrent.TimeUnit;

public class LocalCacheExample {

    public static void main(String[] args) {
        Cache<String, Object> cache = Caffeine.newBuilder()
                .expireAfterWrite(30, TimeUnit.SECONDS)
                .build();

        String key = "key";
        Object value = "value";
        cache.put(key, value);

        Object cachedValue = cache.getIfPresent(key);
        if (cachedValue != null) {
            System.out.println("Value retrieved from cache: " + cachedValue);
        } else {
            // Load value from database and put it in cache
            value = loadValue();
            cache.put(key, value);

            System.out.println("Value loaded from database: " + value);
        }
    }

    private static Object loadValue() {
        // Simulate loading value from database
        return "DB Value";
    }
}

In this case, we use The Caffeine library creates a local cache. The cache stores key-value pairs in the JVM's memory with an expiration time of 30 seconds (i.e. the value will be removed from the cache after 30 seconds).

In the main method of the program, we put a key-value pair ("key", "value") into the cache. We then try to get the value of key "key" from the cache. If the value exists in the cache, it will be returned immediately. Otherwise, we load the value from the database and put it into the cache.

Advantages

The application caching mechanism can bring the following advantages to the Java framework:

• Reduce the number of database accesses
• Improve response time
• Improve system throughput
• Reduce system load

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