Create a wrapper to class to avoid varargs in byte [duplicate]

Question

The spring data redis always require inputs in byte[], so I tried to create a wrapper class so I don't need to convert String to bytes everytime.

However now I encountered an issue with evalSHA method, since it accepts varargs.

evalSha(byte[] scriptSha, ReturnType returnType, int numKeys, byte[]... keysAndArgs)

How to convert my varargs in String to varargs in byte[]?

Below is my current code :

public List<String> evalSHA(String script, int numKeys, String ... keys){ List<String> result = null; RedisConnection redis = redisConnectionFactory.getConnection(); byte[] scriptSHA = redis.get("SCRIPT:CALGROUPQUEUE".getBytes()); if(scriptSHA==null || scriptSHA.length==0){ logger.error("no such script"); return null; } List<byte[]> keysInByte = vargsToList(keys); // what to do below? List<byte[]> resultBytes = redis.evalSha (scriptSHA, ReturnType.MULTI, ???); if(resultBytes!=null && !resultBytes.isEmpty()){ result = new ArrayList<>(); //... to do later } }

Vasan · Accepted Answer · 2018-06-13 03:03:35Z

varargs is nothing but an array, which means in your case, it's a 2D byte array. So you can do the below:

List<byte[]> resultBytes = redis.evalSha(scriptSHA, ReturnType.MULTI, keysInByte.toArray(new byte[][] {}));

This uses the toArray method of List to convert it into an array. To simplify this a bit, you could also have a vargsToArray() helper method instead, which returns an array directly.

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