package com.artfess.redis.util;

import org.springframework.data.redis.core.Cursor;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ScanOptions;

import java.util.HashSet;
import java.util.Set;

/**
 * redis扩展工具
 *
 * @company 广州宏天软件股份有限公司
 * @author heyifan
 * @email heyf@jee-soft.cn
 * @date 2020年6月17日
 */
public abstract class RedisHelper {
    /**
     * scan 实现
     *
     * @param redisTemplate redisTemplate
     * @param pattern       表达式
     */
    public static Set<String> scan(RedisTemplate<String, Object> redisTemplate, String pattern) {
        return redisTemplate.execute((RedisCallback<Set<String>>) connection -> {
            Set<String> keysTmp = new HashSet<>();
            try (Cursor<byte[]> cursor = connection.scan(new ScanOptions.ScanOptionsBuilder()
                    .match(pattern)
                    .count(10000).build())) {

                while (cursor.hasNext()) {
                    keysTmp.add(new String(cursor.next(), "Utf-8"));
                }
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
            return keysTmp;
        });
    }
}

