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);

src/test/java/org/springframework/data/redis/core/DefaultSetOperationsTests.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright 2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.redis.core;
+
+import java.util.Arrays;
+import java.util.Set;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.annotation.IfProfileValue;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+/**
+ * Integration test of {@link DefaultSetOperations}
+ * 
+ * @author Jennifer Hickey
+ * 
+ */
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration("RedisTemplateTests-context.xml")
+public class DefaultSetOperationsTests {
+	
+	@Autowired
+	private RedisTemplate<String, String> redisTemplate;
+	
+	private SetOperations<String, String> setOps;
+	
+	@Before
+	public void setUp() {
+		setOps = redisTemplate.opsForSet();
+	}
+
+	@After
+	public void tearDown() {
+		redisTemplate.getConnectionFactory().getConnection().flushDb();
+	}
+	
+	@Test
+	@IfProfileValue(name = "redisVersion", value = "2.6")
+	public void testRandomMembers() {
+		setOps.add("test", "foo");
+		setOps.add("test", "bar");
+		setOps.add("test", "baz");
+		Set<String> members = setOps.randomMembers("test", 2);
+		assertEquals(2, members.size());
+		assertTrue(Arrays.asList(new String[] {"foo", "bar", "baz"}).containsAll(members));
+	}
+}