private RedisSession loadFromStore(final String clusterId, final RedisSession current) {
List<String> redisData =
jedisExecutor.execute(
new JedisCallback<List<String>>() {
@Override
public List<String> execute(Jedis jedis) {
final String key = RedisSessionIdManager.REDIS_SESSION_KEY + clusterId;
if (current == null) {
return jedis.exists(key) ? jedis.hmget(key, FIELDS) : null;
} else {
String val = jedis.hget(key, "lastSaved");
if (val == null) {
// no session in store
return Collections.emptyList();
}
if (current.lastSaved != Long.parseLong(val)) {
// session has changed - reload
return jedis.hmget(key, FIELDS);
} else {
// session dit not changed in cache since last save
return null;
}
}
}
});
if (redisData == null) {
// case where session has not been modified
return current;
}
if (redisData.isEmpty() || redisData.get(0) == null) {
// no session found in redis (no data)
return null;
}
Map<String, String> data = new HashMap<String, String>();
for (int i = 0; i < FIELDS.length; i++) data.put(FIELDS[i], redisData.get(i));
String attrs = data.get("attributes");
//noinspection unchecked
return new RedisSession(
data,
attrs == null ? new HashMap<String, Object>() : serializer.deserialize(attrs, Map.class));
}
