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/*
 * Copyright (c) 2017. CK. All rights reserved.
 */

package com.github.fartherp.framework.cache.redis;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

/**
 * a implement of CacheManager in Redis
 * 
 * a example:
 *
 * 
 * {@code
 * 
 *     
 *         
 *             
 *         
 *     
 * 
 *
 * 
 *     
 *         127.0.0.1
 *     
 *     
 *         6379
 *     
 *     
 *         123456
 *     
 * 
 *
 *
 * }
 * 
 * Author: CK
 * Date: 2015/12/1
 */
public class RedisCacheManager extends AbstractRedisCacheManager {
    /**
     * 日志类
     */
    private final Log LOGGER = LogFactory.getLog(getClass());

    public String toString() {
        int size = 0;
        if (CollectionUtils.isNotEmpty(getClientList())) {
            size = getClientList().size();
        }
        return "RedisCacheManager clientSize[" + size + "]";
    }

    protected List getClients(Object key) {
        RedisClient client = getClient(key);
        if (client == null) {
            LOGGER.error("Redis Cache Manager get redis client is null.");
            return Collections.emptyList();
        }
        return Arrays.asList(client);
    }

    /**
     * get cache client. use hash code to select client
     *
     * @param key
     *            cache key
     * @return {@link RedisClient} client
     */
    private RedisClient getClient(Object key) {
        if (CollectionUtils.isEmpty(getClientList())) {
            return null;
        }
        List copied = new ArrayList(getClientList());
        int index = Math.abs(key.toString().hashCode() % copied.size());
        return copied.get(index);
    }
}