/**
* Construct a new ketamaRouter
*
* @param redisClientMap key is redis client, value is weight, must > 0.
*/
public KetamaRouter(Map<RedisClient, Integer> redisClientMap) {
this.redisClientMap = redisClientMap;
ketamaClients = new TreeMap<Long, List<RedisClient>>();
// build ke
for (RedisClient client : redisClientMap.keySet()) {
String hashKey = client.hashKey();
int numReps = NUM_REPS * redisClientMap.get(client);
for (int i = 0; i < numReps / 4; i++) {
byte[] digest = HashAlgorithm.computeMd5(hashKey + "-" + i);
for (int h = 0; h < 4; h++) {
long k =
(long) (digest[3 + h * 4] & 0xFF) << 24
| (long) (digest[2 + h * 4] & 0xFF) << 16
| (long) (digest[1 + h * 4] & 0xFF) << 8
| digest[h * 4] & 0xFF;
this.getClientList(ketamaClients, k).add(client);
}
}
}
}