add front demo in this project

LFtid1056/cloudfront/code/rocketmq/MQSelector.h

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+#ifndef _MQSELECTOR_H_
+#define _MQSELECTOR_H_
+#include "MQMessage.h"
+#include "MQMessageQueue.h"
+#include "RocketMQClient.h"
+
+namespace rocketmq {
+class ROCKETMQCLIENT_API MessageQueueSelector {
+ public:
+  virtual ~MessageQueueSelector() {}
+  virtual MQMessageQueue select(const std::vector<MQMessageQueue>& mqs, const MQMessage& msg, void* arg) = 0;
+};
+}  // namespace rocketmq
+#endif