Spring Boot:集成Redisson实现布隆过滤器(Bloom Filter)
import com.google.common.hash.BloomFilter;
import com.google.common.hash.Funnels;
import org.redisson.api.RBloomFilter;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class BloomFilterService {
private final RedissonClient redissonClient;
private final RBloomFilter<String> bloomFilter;
@Autowired
public BloomFilterService(RedissonClient redissonClient) {
this.redissonClient = redissonClient;
// 创建布隆过滤器,假设预计放入元素10000个,希望的误判率为0.01%
bloomFilter = redissonClient.getBloomFilter("myBloomFilter");
long expectedInsertions = 10000;
double falseProbability = 0.01;
BloomFilter<String> bloomFilterGuava = BloomFilter.create(Funnels.stringFunnel(Charsets.UTF_8), expectedInsertions, falseProbability);
bloomFilter.tryInit(expectedInsertions, falseProbability);
// 将Guava Bloom Filter的数据迁移到Redisson的Bloom Filter
for (String element : bloomFilterGuava.asSet()) {
bloomFilter.add(element);
}
}
public boolean mightContain(String element) {
// 检查元素是否可能存在于布隆过滤器中
return bloomFilter.contains(element);
}
public void add(String element) {
// 添加元素到布隆过滤器
bloomFilter.add(element);
}
}
这段代码首先创建了一个BloomFilterService
类,它使用了Redisson提供的RBloomFilter
接口。在构造函数中,它初始化了布隆过滤器的容量和期望的误判率,并且尝试从Guava的BloomFilter
中迁移数据。mightContain
方法用于检查元素是否可能存在于过滤器中,而add
方法用于将元素添加到过滤器中。这个例子展示了如何将Redisson的布隆过滤器功能集成到Spring Boot应用程序中。
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