// Make a Key which is homed to specific nodes.
public static Key make(byte[] kb, byte rf, byte systemType, H2ONode... replicas) {
// no more than 3 replicas allowed to be stored in the key
assert 0 <= replicas.length && replicas.length <= 3;
assert systemType < 32; // only system keys allowed
// Key byte layout is:
// 0 - systemType, from 0-31
// 1 - replica-count, plus up to 3 bits for ip4 vs ip6
// 2-n - zero, one, two or 3 IP4 (4+2 bytes) or IP6 (16+2 bytes) addresses
// 2-5- 4 bytes of chunk#, or -1 for masters
// n+ - repeat of the original kb
AutoBuffer ab = new AutoBuffer();
ab.put1(systemType).put1(replicas.length);
for (H2ONode h2o : replicas) h2o.write(ab);
ab.put4(-1);
ab.putA1(kb, kb.length);
return make(Arrays.copyOf(ab.buf(), ab.position()), rf);
}
