clean code

client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java

@@ -643,72 +643,65 @@ public class MQClientAPIImpl {
         final Message msg,
         final RemotingCommand response
     ) throws MQBrokerException, RemotingCommandException {
+        SendStatus sendStatus;
         switch (response.getCode()) {
-            case ResponseCode.FLUSH_DISK_TIMEOUT:
-            case ResponseCode.FLUSH_SLAVE_TIMEOUT:
+            case ResponseCode.FLUSH_DISK_TIMEOUT: {
+                sendStatus = SendStatus.FLUSH_DISK_TIMEOUT;
+                break;
+            }
+            case ResponseCode.FLUSH_SLAVE_TIMEOUT: {
+                sendStatus = SendStatus.FLUSH_SLAVE_TIMEOUT;
+                break;
+            }
             case ResponseCode.SLAVE_NOT_AVAILABLE: {
+                sendStatus = SendStatus.SLAVE_NOT_AVAILABLE;
+                break;
             }
             case ResponseCode.SUCCESS: {
-                SendStatus sendStatus = SendStatus.SEND_OK;
-                switch (response.getCode()) {
-                    case ResponseCode.FLUSH_DISK_TIMEOUT:
-                        sendStatus = SendStatus.FLUSH_DISK_TIMEOUT;
-                        break;
-                    case ResponseCode.FLUSH_SLAVE_TIMEOUT:
-                        sendStatus = SendStatus.FLUSH_SLAVE_TIMEOUT;
-                        break;
-                    case ResponseCode.SLAVE_NOT_AVAILABLE:
-                        sendStatus = SendStatus.SLAVE_NOT_AVAILABLE;
-                        break;
-                    case ResponseCode.SUCCESS:
-                        sendStatus = SendStatus.SEND_OK;
-                        break;
-                    default:
-                        assert false;
-                        break;
-                }
+                sendStatus = SendStatus.SEND_OK;
+                break;
+            }
+            default: {
+                assert false;
+                throw new MQBrokerException(response.getCode(), response.getRemark());
+            }
+        }
 
-                SendMessageResponseHeader responseHeader =
-                    (SendMessageResponseHeader) response.decodeCommandCustomHeader(SendMessageResponseHeader.class);
+        SendMessageResponseHeader responseHeader =
+                (SendMessageResponseHeader) response.decodeCommandCustomHeader(SendMessageResponseHeader.class);
 
-                //If namespace not null , reset Topic without namespace.
-                String topic = msg.getTopic();
-                if (StringUtils.isNotEmpty(this.clientConfig.getNamespace())) {
-                    topic = NamespaceUtil.withoutNamespace(topic, this.clientConfig.getNamespace());
-                }
+        //If namespace not null , reset Topic without namespace.
+        String topic = msg.getTopic();
+        if (StringUtils.isNotEmpty(this.clientConfig.getNamespace())) {
+            topic = NamespaceUtil.withoutNamespace(topic, this.clientConfig.getNamespace());
+        }
 
-                MessageQueue messageQueue = new MessageQueue(topic, brokerName, responseHeader.getQueueId());
+        MessageQueue messageQueue = new MessageQueue(topic, brokerName, responseHeader.getQueueId());
 
-                String uniqMsgId = MessageClientIDSetter.getUniqID(msg);
-                if (msg instanceof MessageBatch) {
-                    StringBuilder sb = new StringBuilder();
-                    for (Message message : (MessageBatch) msg) {
-                        sb.append(sb.length() == 0 ? "" : ",").append(MessageClientIDSetter.getUniqID(message));
-                    }
-                    uniqMsgId = sb.toString();
-                }
-                SendResult sendResult = new SendResult(sendStatus,
-                    uniqMsgId,
-                    responseHeader.getMsgId(), messageQueue, responseHeader.getQueueOffset());
-                sendResult.setTransactionId(responseHeader.getTransactionId());
-                String regionId = response.getExtFields().get(MessageConst.PROPERTY_MSG_REGION);
-                String traceOn = response.getExtFields().get(MessageConst.PROPERTY_TRACE_SWITCH);
-                if (regionId == null || regionId.isEmpty()) {
-                    regionId = MixAll.DEFAULT_TRACE_REGION_ID;
-                }
-                if (traceOn != null && traceOn.equals("false")) {
-                    sendResult.setTraceOn(false);
-                } else {
-                    sendResult.setTraceOn(true);
-                }
-                sendResult.setRegionId(regionId);
-                return sendResult;
-            }
-            default:
-                break;
+        String uniqMsgId = MessageClientIDSetter.getUniqID(msg);
+        if (msg instanceof MessageBatch) {
+            StringBuilder sb = new StringBuilder();
+            for (Message message : (MessageBatch) msg) {
+                sb.append(sb.length() == 0 ? "" : ",").append(MessageClientIDSetter.getUniqID(message));
+            }
+            uniqMsgId = sb.toString();
+        }
+        SendResult sendResult = new SendResult(sendStatus,
+                uniqMsgId,
+                responseHeader.getMsgId(), messageQueue, responseHeader.getQueueOffset());
+        sendResult.setTransactionId(responseHeader.getTransactionId());
+        String regionId = response.getExtFields().get(MessageConst.PROPERTY_MSG_REGION);
+        String traceOn = response.getExtFields().get(MessageConst.PROPERTY_TRACE_SWITCH);
+        if (regionId == null || regionId.isEmpty()) {
+            regionId = MixAll.DEFAULT_TRACE_REGION_ID;
+        }
+        if (traceOn != null && traceOn.equals("false")) {
+            sendResult.setTraceOn(false);
+        } else {
+            sendResult.setTraceOn(true);
         }
-
-        throw new MQBrokerException(response.getCode(), response.getRemark());
+        sendResult.setRegionId(regionId);
+        return sendResult;
     }
 
     public PullResult pullMessage(