+ add support for zset count

spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/core/BoundZSetOperations.java

@@ -53,6 +53,8 @@ public interface BoundZSetOperations<K, V> extends KeyBound<K> {
 
 	Boolean remove(Object o);
 
+	Long count(double min, double max);
+
 	Long size();
 
 	Double score(Object o);

spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/core/DefaultBoundZSetOperations.java

@@ -104,6 +104,11 @@ class DefaultBoundZSetOperations<K, V> extends DefaultKeyBound<K> implements Bou
 		return ops.reverseRange(getKey(), start, end);
 	}
 
+	@Override
+	public Long count(double min, double max) {
+		return ops.count(getKey(), min, max);
+	}
+
 	@Override
 	public Long size() {
 		return ops.size(getKey());

spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/core/RedisTemplate.java

@@ -1488,6 +1488,18 @@ public class RedisTemplate<K, V> extends RedisAccessor implements RedisOperation
 			}, true);
 		}
 
+		@Override
+		public Long count(K key, final double min, final double max) {
+			final byte[] rawKey = rawKey(key);
+
+			return execute(new RedisCallback<Long>() {
+				@Override
+				public Long doInRedis(RedisConnection connection) {
+					return connection.zCount(rawKey, min, max);
+				}
+			}, true);
+		}
+
 		@Override
 		public Long size(K key) {
 			final byte[] rawKey = rawKey(key);

spring-data-redis/src/main/java/org/springframework/data/keyvalue/redis/core/ZSetOperations.java

@@ -52,6 +52,8 @@ public interface ZSetOperations<K, V> {
 
 	void removeRangeByScore(K key, double min, double max);
 
+	Long count(K key, double min, double max);
+
 	Long size(K key);
 
 	RedisOperations<K, V> getOperations();