java框架中的缓存与Nosql数据存储的互补作用

// 实体类 Customer
@Document
public class Customer {
    private String id;
    private String name;
    private String address;
}

// 缓存配置类
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

class GuavaCacheConfig {
    @Bean
    public LoadingCache<String, Customer> customerCache() {
        return CacheBuilder.newBuilder()
                .expireAfterWrite(10, TimeUnit.MINUTES)
                .maximumSize(100)
                .build(new CacheLoader<String, Customer>() {
                    @Override
                    public Customer load(String key) throws Exception {
                        return MongoDBClient.getCustomer(key);
                    }
                });
    }
}

// MongoDB 客户端
public class MongoDBClient {
    ...
    public static Customer getCustomer(String id) {
        // 从 MongoDB 中获取客户信息
        ...
    }
}

// 控制器类
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class CustomerController {

    @Autowired
    private LoadingCache<String, Customer> customerCache;

    @GetMapping("/customers/{id}")
    public Customer getCustomer(@PathVariable String id) {
        return customerCache.get(id);
    }
}