Fix set with args method signature #159

Signature of the set method with SetArgs returned the value instead of the string status response. This mismatch gets obvious when using custom codes with value types other than String.

This commit changes the API to fix the mismatch.

src/main/java/com/lambdaworks/redis/RedisAsyncConnectionImpl.java

@@ -798,7 +798,7 @@ public RedisFuture<String> set(K key, V value) {
     }
 
     @Override
-    public RedisFuture<V> set(K key, V value, SetArgs setArgs) {
+    public RedisFuture<String> set(K key, V value, SetArgs setArgs) {
         return dispatch(commandBuilder.set(key, value, setArgs));
     }
 

src/main/java/com/lambdaworks/redis/RedisCommandBuilder.java

@@ -779,10 +779,10 @@ public Command<K, V, String> set(K key, V value) {
         return createCommand(SET, new StatusOutput<K, V>(codec), key, value);
     }
 
-    public Command<K, V, V> set(K key, V value, SetArgs setArgs) {
+    public Command<K, V, String> set(K key, V value, SetArgs setArgs) {
         CommandArgs<K, V> args = new CommandArgs<K, V>(codec).addKey(key).addValue(value);
         setArgs.build(args);
-        return createCommand(SET, new ValueOutput<K, V>(codec), args);
+        return createCommand(SET, new StatusOutput<K, V>(codec), args);
     }
 
     public Command<K, V, Long> setbit(K key, long offset, int value) {

src/main/java/com/lambdaworks/redis/RedisStringsAsyncConnection.java

@@ -271,7 +271,7 @@ public interface RedisStringsAsyncConnection<K, V> {
      * 
      * @return RedisFuture&lt;V&gt; simple-string-reply {@code OK} if {@code SET} was executed correctly.
      */
-    RedisFuture<V> set(K key, V value, SetArgs setArgs);
+    RedisFuture<String> set(K key, V value, SetArgs setArgs);
 
     /**
      * Sets or clears the bit at offset in the string value stored at key.

src/main/java/com/lambdaworks/redis/RedisStringsConnection.java

@@ -265,9 +265,9 @@ public interface RedisStringsConnection<K, V> {
      * @param value the value
      * @param setArgs the setArgs
      * 
-     * @return V simple-string-reply {@code OK} if {@code SET} was executed correctly.
+     * @return String simple-string-reply {@code OK} if {@code SET} was executed correctly.
      */
-    V set(K key, V value, SetArgs setArgs);
+    String set(K key, V value, SetArgs setArgs);
 
     /**
      * Sets or clears the bit at offset in the string value stored at key.

src/main/java/com/lambdaworks/redis/protocol/CommandOutput.java

@@ -107,6 +107,10 @@ public void complete(int depth) {
     }
 
     protected String decodeAscii(ByteBuffer bytes) {
+        if(bytes == null) {
+            return null;
+        }
+
         char[] chars = new char[bytes.remaining()];
         for (int i = 0; i < chars.length; i++) {
             chars[i] = (char) bytes.get();

src/test/java/com/lambdaworks/redis/CustomCodecTest.java

@@ -14,17 +14,24 @@
 import java.util.List;
 
 import com.lambdaworks.redis.codec.ByteArrayCodec;
+import com.lambdaworks.redis.protocol.SetArgs;
 import org.junit.Test;
 
 import com.lambdaworks.redis.codec.RedisCodec;
 
 public class CustomCodecTest extends AbstractCommandTest {
     @Test
-    public void test() throws Exception {
+    public void testJavaSerializer() throws Exception {
         RedisConnection<String, Object> connection = client.connect(new SerializedObjectCodec());
+
         List<String> list = list("one", "two");
         connection.set(key, list);
+
         assertThat(connection.get(key)).isEqualTo(list);
+        assertThat(connection.set(key, list)).isEqualTo("OK");
+        assertThat(connection.set(key, list, SetArgs.Builder.ex(1))).isEqualTo("OK");
+
+        connection.close();
     }
 
     @Test