From cb0f559709efdf86569baa6977ca799eb747de93 Mon Sep 17 00:00:00 2001
From: Costin Leau <cleau@vmware.com>
Date: Wed, 13 Feb 2013 17:32:38 +0200
Subject: [PATCH] minor optimization to #del()

---
 .../org/springframework/data/redis/core/RedisTemplate.java   | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/org/springframework/data/redis/core/RedisTemplate.java b/src/main/java/org/springframework/data/redis/core/RedisTemplate.java
index eabdf1a0c..d3407988f 100644
--- a/src/main/java/org/springframework/data/redis/core/RedisTemplate.java
+++ b/src/main/java/org/springframework/data/redis/core/RedisTemplate.java
@@ -38,6 +38,7 @@ import org.springframework.data.redis.serializer.StringRedisSerializer;
 import org.springframework.transaction.support.TransactionSynchronizationManager;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
+import org.springframework.util.CollectionUtils;
 
 /**
  * Helper class that simplifies Redis data access code. 
@@ -441,6 +442,10 @@ public class RedisTemplate<K, V> extends RedisAccessor implements RedisOperation
 
 
 	public void delete(Collection<K> keys) {
+		if (CollectionUtils.isEmpty(keys)) {
+			return;
+		}
+
 		final byte[][] rawKeys = rawKeys(keys);
 
 		execute(new RedisCallback<Object>() {