Merge branch 'fixes-758' of github.com:HeartSaVioR/jedis into HeartSaVioR-fixes-758

src/main/java/redis/clients/jedis/Pipeline.java

@@ -88,19 +88,20 @@ public class Pipeline extends MultiKeyPipelineBase {
     }
 
     /**
-     * Syncronize pipeline by reading all responses. This operation close the
+     * Synchronize pipeline by reading all responses. This operation close the
      * pipeline. In order to get return values from pipelined commands, capture
      * the different Response<?> of the commands you execute.
      */
     public void sync() {
-	List<Object> unformatted = client.getMany(getPipelinedResponseLength());
-	for (Object o : unformatted) {
-	    generateResponse(o);
-	}
+    	if (getPipelinedResponseLength() > 0) {
+            List<Object> unformatted = client.getMany(getPipelinedResponseLength());
+            for (Object o : unformatted) {
+                generateResponse(o);
+            }
+    	}
     }
-
     /**
-     * Syncronize pipeline by reading all responses. This operation close the
+     * Synchronize pipeline by reading all responses. This operation close the
      * pipeline. Whenever possible try to avoid using this version and use
      * Pipeline.sync() as it won't go through all the responses and generate the
      * right response type (usually it is a waste of time).
@@ -108,17 +109,20 @@ public class Pipeline extends MultiKeyPipelineBase {
      * @return A list of all the responses in the order you executed them.
      */
     public List<Object> syncAndReturnAll() {
-	List<Object> unformatted = client.getMany(getPipelinedResponseLength());
-	List<Object> formatted = new ArrayList<Object>();
-
-	for (Object o : unformatted) {
-	    try {
-		formatted.add(generateResponse(o).get());
-	    } catch (JedisDataException e) {
-		formatted.add(e);
-	    }
-	}
-	return formatted;
+        if (getPipelinedResponseLength() > 0) {
+            List<Object> unformatted = client.getMany(getPipelinedResponseLength());
+            List<Object> formatted = new ArrayList<Object>();
+            for (Object o : unformatted) {
+                try {
+                    formatted.add(generateResponse(o).get());
+                } catch (JedisDataException e) {
+                    formatted.add(e);
+                }
+            }
+            return formatted;
+        } else {
+            return java.util.Collections.<Object>emptyList();
+        }
     }
 
     public Response<String> discard() {

src/test/java/redis/clients/jedis/tests/PipeliningTest.java

@@ -450,6 +450,25 @@ public class PipeliningTest extends Assert {
 
 	assertTrue(result.get(3) instanceof JedisDataException);
     }
+    
+    @Test
+    public void testSyncWithNoCommandQueued() {
+	// we need to test with fresh instance of Jedis
+	Jedis jedis2 = new Jedis(hnp.getHost(), hnp.getPort(), 500);
+	
+	Pipeline pipeline = jedis2.pipelined();
+	pipeline.sync();
+	
+	jedis2.close();
+	
+	jedis2 = new Jedis(hnp.getHost(), hnp.getPort(), 500);
+	
+	pipeline = jedis2.pipelined();
+	List<Object> resp = pipeline.syncAndReturnAll();
+	assertTrue(resp.isEmpty());
+	
+	jedis2.close();
+    }
 
     private void verifyHasBothValues(String firstKey, String secondKey,
 	    String value1, String value2) {

src/test/java/redis/clients/jedis/tests/ShardedJedisPipelineTest.java

@@ -4,6 +4,7 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
 
 import java.io.UnsupportedEncodingException;
 import java.util.ArrayList;
@@ -18,6 +19,7 @@ import org.junit.Test;
 import redis.clients.jedis.HostAndPort;
 import redis.clients.jedis.Jedis;
 import redis.clients.jedis.JedisShardInfo;
+import redis.clients.jedis.Pipeline;
 import redis.clients.jedis.Response;
 import redis.clients.jedis.ShardedJedis;
 import redis.clients.jedis.ShardedJedisPipeline;
@@ -130,4 +132,32 @@ public class ShardedJedisPipelineTest {
 	p.sync();
 	assertNull(shouldNotExist.get());
     }
+    
+    @Test
+    public void testSyncWithNoCommandQueued() {
+	JedisShardInfo shardInfo1 = new JedisShardInfo(redis1.getHost(),
+		redis1.getPort());
+	JedisShardInfo shardInfo2 = new JedisShardInfo(redis2.getHost(),
+		redis2.getPort());
+	shardInfo1.setPassword("foobared");
+	shardInfo2.setPassword("foobared");
+	List<JedisShardInfo> shards = new ArrayList<JedisShardInfo>();
+	shards.add(shardInfo1);
+	shards.add(shardInfo2);
+	
+	ShardedJedis jedis2 = new ShardedJedis(shards);
+	
+	ShardedJedisPipeline pipeline = jedis2.pipelined();
+	pipeline.sync();
+	
+	jedis2.close();
+	
+	jedis2 = new ShardedJedis(shards);
+	pipeline = jedis2.pipelined();
+	List<Object> resp = pipeline.syncAndReturnAll();
+	assertTrue(resp.isEmpty());
+	
+	jedis2.close();
+    }
+
 }