/**
* Store an end-point to host ID mapping. Each ID must be unique, and cannot be changed after the
* fact.
*
* @param hostId
* @param endpoint
*/
public void updateHostId(UUID hostId, InetAddress endpoint) {
assert hostId != null;
assert endpoint != null;
lock.writeLock().lock();
try {
InetAddress storedEp = endpointToHostIdMap.inverse().get(hostId);
if (storedEp != null) {
if (!storedEp.equals(endpoint) && (FailureDetector.instance.isAlive(storedEp))) {
throw new RuntimeException(
String.format(
"Host ID collision between active endpoint %s and %s (id=%s)",
storedEp, endpoint, hostId));
}
}
UUID storedId = endpointToHostIdMap.get(endpoint);
if ((storedId != null) && (!storedId.equals(hostId)))
logger.warn("Changing {}'s host ID from {} to {}", endpoint, storedId, hostId);
endpointToHostIdMap.forcePut(endpoint, hostId);
} finally {
lock.writeLock().unlock();
}
}
static {
try {
emptyVersion = UUID.nameUUIDFromBytes(MessageDigest.getInstance("MD5").digest());
} catch (NoSuchAlgorithmException e) {
throw new AssertionError();
}
}
final Set<UUID> getPlayers() {
ImmutableSet.Builder<UUID> setBuilder = ImmutableSet.builder();
if (pool != null) {
try (Jedis rsc = pool.getResource()) {
List<String> keys = new ArrayList<>();
for (String i : getServerIds()) {
keys.add("proxy:" + i + ":usersOnline");
}
if (!keys.isEmpty()) {
Set<String> users = rsc.sunion(keys.toArray(new String[keys.size()]));
if (users != null && !users.isEmpty()) {
for (String user : users) {
try {
setBuilder = setBuilder.add(UUID.fromString(user));
} catch (IllegalArgumentException ignored) {
}
}
}
}
} catch (JedisConnectionException e) {
// Redis server has disappeared!
getLogger()
.log(
Level.SEVERE,
"Unable to get connection from pool - did your Redis server go away?",
e);
throw new RuntimeException("Unable to get all players online", e);
}
}
return setBuilder.build();
}
public Set<UUID> getPlayersOnProxy(String server) {
checkArgument(getServerIds().contains(server), server + " is not a valid proxy ID");
try (Jedis jedis = pool.getResource()) {
Set<String> users = jedis.smembers("proxy:" + server + ":usersOnline");
ImmutableSet.Builder<UUID> builder = ImmutableSet.builder();
for (String user : users) {
builder.add(UUID.fromString(user));
}
return builder.build();
}
}
final Set<UUID> getPlayersOnServer(@NonNull String server) {
checkArgument(getProxy().getServers().containsKey(server), "server does not exist");
Collection<String> asStrings =
(Collection<String>)
getServerPlayersScript.eval(
ImmutableList.<String>of(), ImmutableList.<String>of(server));
ImmutableSet.Builder<UUID> builder = ImmutableSet.builder();
for (String s : asStrings) {
builder.add(UUID.fromString(s));
}
return builder.build();
}
/**
* Read schema from system table and calculate MD5 digest of every row, resulting digest will be
* converted into UUID which would act as content-based version of the schema.
*/
public void updateVersion() {
try {
MessageDigest versionDigest = MessageDigest.getInstance("MD5");
for (Row row : SystemTable.serializedSchema()) {
if (invalidSchemaRow(row) || ignoredSchemaRow(row)) continue;
row.cf.updateDigest(versionDigest);
}
version = UUID.nameUUIDFromBytes(versionDigest.digest());
SystemTable.updateSchemaVersion(version);
} catch (Exception e) {
throw new RuntimeException(e);
}
}