Add sInterCard methods to JedisClusterSetCommands and LettuceClusterSetCommands

Author: Kiminni

src/main/java/org/springframework/data/redis/connection/jedis/JedisClusterSetCommands.java

@@ -40,6 +40,7 @@
 /**
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Mingi Lee
  * @since 2.0
  */
 class JedisClusterSetCommands implements RedisSetCommands {
@@ -230,6 +231,25 @@ public Long sInterStore(byte[] destKey, byte[]... keys) {
 		return sAdd(destKey, result.toArray(new byte[result.size()][]));
 	}
 
+	@Override
+	public Long sInterCard(byte[]... keys) {
+
+		Assert.notNull(keys, "Keys must not be null");
+		Assert.noNullElements(keys, "Keys must not contain null elements");
+
+		if (ClusterSlotHashUtil.isSameSlotForAllKeys(keys)) {
+			try {
+				return connection.getCluster().sintercard(keys);
+			} catch (Exception ex) {
+				throw convertJedisAccessException(ex);
+			}
+		}
+
+		// For multi-slot clusters, calculate intersection cardinality by performing intersection
+		Set<byte[]> result = sInter(keys);
+		return (long) result.size();
+	}
+
 	@Override
 	public Set<byte[]> sUnion(byte[]... keys) {
 

src/main/java/org/springframework/data/redis/connection/lettuce/LettuceClusterSetCommands.java

@@ -31,6 +31,7 @@
 /**
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Mingi Lee
  * @since 2.0
  */
 class LettuceClusterSetCommands extends LettuceSetCommands {
@@ -118,6 +119,21 @@ public Long sInterStore(byte[] destKey, byte[]... keys) {
 		return sAdd(destKey, result.toArray(new byte[result.size()][]));
 	}
 
+	@Override
+	public Long sInterCard(byte[]... keys) {
+
+		Assert.notNull(keys, "Keys must not be null");
+		Assert.noNullElements(keys, "Keys must not contain null elements");
+
+		if (ClusterSlotHashUtil.isSameSlotForAllKeys(keys)) {
+			return super.sInterCard(keys);
+		}
+
+		// For multi-slot clusters, calculate intersection cardinality by performing intersection
+		Set<byte[]> result = sInter(keys);
+		return (long) result.size();
+	}
+
 	@Override
 	public Set<byte[]> sUnion(byte[]... keys) {