Linchen-Xu commented on code in PR #13238:
URL: https://github.com/apache/dubbo/pull/13238#discussion_r1368348587
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dubbo-metadata/dubbo-metadata-report-redis/src/main/java/org/apache/dubbo/metadata/store/redis/RedisMetadataReport.java:
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@@ -61,12 +77,34 @@ public class RedisMetadataReport extends
AbstractMetadataReport {
private Set<HostAndPort> jedisClusterNodes;
private int timeout;
private String password;
+ private final String root;
+ private MD5Utils md5Utils = new MD5Utils();
+ protected ConcurrentMap<String, MappingDataListener> listenerMap = new
ConcurrentHashMap<>();
+ private String luaScript="local key = KEYS[1];\n" +
+ "local field = ARGV[1];\n" +
+ "local oldValue = ARGV[2];\n" +
+ "local newValue = ARGV[3];\n" +
+ "local channel = ARGV[4];\n" +
+ "local valueExists = redis.call(\"HEXISTS\", key, field);\n" +
+ "if valueExists == 0 then\n" +
+ " redis.call(\"HSET\", key, field, newValue);\n" +
Review Comment:
Starting from version 2.2, redis provides `WATCH` to help implement [cas
behavior](https://redis.io/docs/interact/transactions/#cas) in case race
conditions may occur.
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