spark更新广播变量实例

实际项目中需要使用更新广播变量的方式来满足需求，其代码具体如下：

@NotProguard
public class WbBroadcastWrapper {
	
	Broadcast> broadcastBlackWhiteList = null;
	private static WbBroadcastWrapper obj = new WbBroadcastWrapper();

    private WbBroadcastWrapper(){}

    public static WbBroadcastWrapper getInstance() {
        return obj;
    }
    
    public JavaSparkContext getSparkContext(SparkContext sc) {
        JavaSparkContext jsc = JavaSparkContext.fromSparkContext(sc);
        return jsc;
    }
    
    public Broadcast> updateAndGetWbBroadCast(SparkContext sparkContext,Map params) {
    	if(broadcastBlackWhiteList == null || judgeBlackAndWhiteIsUpdate(params)) {
    		JRedisClusterHelper instance = JRedisClusterHelper.getInstance();
    		String path = params.get("redis.jedisPoolConfig.urls");
    		JedisCluster jedisCluster = instance.getJedisCluster(path);
			String blackWhiteSql = jedisCluster.hget("black_white_list", "1");
			DbFetcher dbFetcher = new DbFetcher();
			List fetchSqlList = dbFetcher.fetchSqlList(blackWhiteSql,params);
			if(broadcastBlackWhiteList != null) {
				broadcastBlackWhiteList.unpersist();
			}
			broadcastBlackWhiteList = getSparkContext(sparkContext).broadcast(fetchSqlList);
    	}
    	return broadcastBlackWhiteList;
    }
    
    
	public static boolean judgeBlackAndWhiteIsUpdate(Map parmas) {
		JRedisClusterHelper instance = JRedisClusterHelper.getInstance();
		String path = parmas.get("redis.jedisPoolConfig.urls");
		JedisCluster jedisCluster = instance.getJedisCluster(path);
		String modified = jedisCluster.get(FinalParameterHelper.BLACK_AND_WHITE_MODIFIED);
		if(modified != null && Integer.parseInt(modified.trim()) == 1) {
			jedisCluster.set(FinalParameterHelper.BLACK_AND_WHITE_MODIFIED, "0");
			return true;
		}
		return false;
	}
    
}