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Add a cluster-backed message cache.

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This commit is contained in:
Jon Chambers
2020-07-09 09:34:20 -04:00
committed by Jon Chambers
parent 639898ec07
commit 6fc1b4c6c0
15 changed files with 690 additions and 59 deletions
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37
service/src/main/java/org/whispersystems/textsecuregcm/util/RedisClusterUtil.java Normal file
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package org.whispersystems.textsecuregcm.util;
import io.lettuce.core.cluster.SlotHash;
import io.lettuce.core.cluster.api.sync.RedisAdvancedClusterCommands;
import io.lettuce.core.cluster.models.partitions.RedisClusterNode;
public class RedisClusterUtil {
private static final String[] HASHES_BY_SLOT = new String[SlotHash.SLOT_COUNT];
static {
int slotsCovered = 0;
int i = 0;
while (slotsCovered < HASHES_BY_SLOT.length) {
final String hash = Integer.toString(i++, 36);
final int slot = SlotHash.getSlot(hash);
if (HASHES_BY_SLOT[slot] == null) {
HASHES_BY_SLOT[slot] = hash;
slotsCovered += 1;
}
}
}
/**
* Returns a short Redis hash tag that maps to the same Redis cluster slot as the given key.
*
* @param key the key for which to find a matching hash tag
* @return a Redis hash tag that maps to the same Redis cluster slot as the given key
*
* @see <a href="https://redis.io/topics/cluster-spec#keys-hash-tags">Redis Cluster Specification - Keys hash tags</a>
*/
public static String getMinimalHashTag(final String key) {
return HASHES_BY_SLOT[SlotHash.getSlot(key)];
}
}