Add Redis 2.6 srandmember with count to SetOperations

DATAREDIS-116

src/main/java/org/springframework/data/redis/core/BoundSetOperations.java

@@ -62,6 +62,8 @@ public interface BoundSetOperations<K, V> extends BoundKeyOperations<K> {
 
 	V randomMember();
 
+	Set<V> randomMembers(long count);
+
 	Boolean remove(Object o);
 
 	V pop();

src/main/java/org/springframework/data/redis/core/DefaultBoundSetOperations.java

@@ -113,12 +113,17 @@ class DefaultBoundSetOperations<K, V> extends DefaultBoundKeyOperations<K> imple
 		return ops.randomMember(getKey());
 	}
 
+
+	public Set<V> randomMembers(long count) {
+		return ops.randomMembers(getKey(), count);
+	}
+
 	
 	public Boolean remove(Object o) {
 		return ops.remove(getKey(), o);
 	}
-
 	
+
 	public V pop() {
 		return ops.pop(getKey());
 	}

src/main/java/org/springframework/data/redis/core/DefaultSetOperations.java

@@ -162,6 +162,18 @@ class DefaultSetOperations<K, V> extends AbstractOperations<K, V> implements Set
 		}, true);
 	}
 
+
+	public Set<V> randomMembers(K key, final long count) {
+		final byte[] rawKey = rawKey(key);
+		Set<byte[]> rawValues = execute(new RedisCallback<Set<byte[]>>() {
+			public Set<byte[]> doInRedis(RedisConnection connection) {
+				return connection.sRandMember(rawKey, count);
+			}
+		}, true);
+
+		return deserializeValues(rawValues);
+	}
+
 	
 	public Boolean remove(K key, Object o) {
 		final byte[] rawKey = rawKey(key);

src/main/java/org/springframework/data/redis/core/SetOperations.java

@@ -60,6 +60,8 @@ public interface SetOperations<K, V> {
 
 	V randomMember(K key);
 
+	Set<V> randomMembers(K key, long count);
+
 	Boolean remove(K key, Object o);
 
 	V pop(K key);