SpringBoot cache preheating battle

introduction

In modern applications, cache warm-up is a common optimization strategy designed to improve system responsiveness and performance. Especially when Spring Boot project is started, loading data into a cache system (such as Redis) in advance can effectively reduce the delay of first requests. This article will explore different solutions for cache warm-up after the Spring Boot project is launched.

What is cache warm-up?

Cache warm-up refers to loading commonly used data into the cache in advance when the application is started to reduce the latency of the user's first access. In this way, the system can ensure that the required data is ready before the user request arrives, thereby improving response speed and user experience.

Implementation plan overview

After Spring Boot is started, cache warm-up can be implemented in the following ways:

• Use Start Listening Events: Listen to the application context initialization completion event and perform data loading.
• Use @PostConstruct annotation: Execute cache warm-up logic after bean is initialized.
• Use CommandLineRunner or ApplicationRunner: Execute custom initialization logic after the application is started.
• Implementing the InitializingBean interface: Perform cache warm-up after bean initialization is completed.

Specific implementation plan

Start the listening event

Can be usedApplicationListenerMonitorContextRefreshedEventorApplicationReadyEventetc., after these events are triggered, the operation of loading data into the cache is performed.

Sample code

import ;
import ;
import ;

@Component
public class CacheWarmer implements ApplicationListener<ContextRefreshedEvent> {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        // Execute cache preheating service...        ("key", dataList);
    }
}

Or monitorApplicationReadyEventevent:

import ;
import ;
import ;

@Component
public class CacheWarmer implements ApplicationListener<ApplicationReadyEvent> {
    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        // Execute cache preheating service...        ("key", dataList);
    }
}

@PostConstruct annotation

Add on the class that needs to be cached preheated@ComponentAnnotation and add in its method@PostConstructAnnotation and cache warm-up business logic.

Sample code

import ;
import ;

@Component
public class CachePreloader {
    
    @Autowired
    private YourCacheManager cacheManager;

    @PostConstruct
    public void preloadCache() {
        // Execute cache preheating service...        ("key", dataList);
    }
}

CommandLineRunner or ApplicationRunner

CommandLineRunnerandApplicationRunnerThey are all interfaces to be executed after the Spring Boot application is started, allowing us to execute some custom initialization logic after the application is started, such as cache warm-up.

CommandLineRunner Example

import ;
import ;

@Component
public class MyCommandLineRunner implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        // Execute cache preheating service...        ("key", dataList);
    }
}

ApplicationRunner Example

import ;
import ;
import ;

@Component
public class MyApplicationRunner implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments args) throws Exception {
        // Execute cache preheating service...        ("key", dataList);
    }
}

the difference：

• CommandLineRunner: Receive command line parameters as variable length string array.
• ApplicationRunner: Receive oneApplicationArgumentsObject, providing more powerful parameter resolution capabilities.

Implement the InitializingBean interface

accomplishInitializingBeanInterface and rewriteafterPropertiesSetMethod: Cache warm-up can be performed after Spring Bean initialization is completed.

Sample code

import ;
import ;

@Component
public class CachePreloader implements InitializingBean {
    @Autowired
    private YourCacheManager cacheManager;

    @Override
    public void afterPropertiesSet() throws Exception {
        // Execute cache preheating service...        ("key", dataList);
    }
}

Summarize

Cache preheating is one of the important strategies to improve system performance. In Spring Boot project, we can implement cache warm-up in a variety of ways, including using startup listening events,@PostConstructannotation,CommandLineRunner、ApplicationRunnerAnd implementInitializingBeaninterface. Choosing the appropriate implementation method can effectively improve the application's response speed and user experience. I hope this article can help you better understand and apply the cache preheating mechanism and improve the performance of the system.

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