add google pb generic service implement

dubbo-common/pom.xml

@@ -77,5 +77,9 @@
             <groupId>de.ruedigermoeller</groupId>
             <artifactId>fst</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.google.protobuf</groupId>
+            <artifactId>protobuf-java-util</artifactId>
+        </dependency>
     </dependencies>
 </project>

dubbo-common/src/main/java/org/apache/dubbo/common/Constants.java

@@ -727,6 +727,8 @@ public class Constants {
 
     public static final String GENERIC_SERIALIZATION_BEAN = "bean";
 
+    public static final String GENERIC_SERIALIZATION_PROTO = "proto";
+
     public static final String DUBBO_IP_TO_REGISTRY = "DUBBO_IP_TO_REGISTRY";
 
     public static final String DUBBO_PORT_TO_REGISTRY = "DUBBO_PORT_TO_REGISTRY";

dubbo-common/src/main/java/org/apache/dubbo/common/utils/ProtobufUtils.java

@@ -0,0 +1,76 @@
+/*
+ * 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.
+ */
+package org.apache.dubbo.common.utils;
+
+import java.lang.reflect.Method;
+
+import com.google.protobuf.GeneratedMessageV3;
+import com.google.protobuf.GeneratedMessageV3.Builder;
+import com.google.protobuf.MessageOrBuilder;
+import com.google.protobuf.util.JsonFormat;
+import com.google.protobuf.util.JsonFormat.Parser;
+import com.google.protobuf.util.JsonFormat.Printer;
+
+/**
+ * 2019/4/4
+ */
+public class ProtobufUtils {
+
+  public static boolean isSupported(Class<?> clazz) {
+    if (clazz == null) {
+      return false;
+    }
+
+    if (GeneratedMessageV3.class.isAssignableFrom(clazz)) {
+      return true;
+    }
+    return false;
+  }
+
+  public static <T> T deserialize(String json, Class<T> requestClass) {
+    if (!isSupported(requestClass)) {
+      throw new UnsupportedOperationException(requestClass.getName() + "can not be deserialize");
+    }
+    Builder builder;
+    try{
+      builder = getMessageBuilder(requestClass);
+      Parser parser = JsonFormat.parser();
+      parser.merge(json, builder);
+    }catch (Exception e){
+      throw new RuntimeException("Failed to deserialize "+requestClass,e );
+    }
+
+    return (T) builder.build();
+  }
+
+  public static String serialize(Object value) {
+    String result;
+    try {
+      Printer printer = JsonFormat.printer();
+      result = printer.print((MessageOrBuilder) value);
+    } catch (Exception e) {
+      result = e.getMessage();
+    }
+    return result;
+  }
+
+  private static Builder getMessageBuilder(Class<?> requestType) throws Exception {
+    Method method = requestType.getMethod("newBuilder");
+
+    return (Builder) method.invoke(null, null);
+  }
+}

dubbo-demo/dubbo-demo-protobuf/dubbo-demo-protobuf-api/pom.xml

@@ -0,0 +1,28 @@
+<!--
+  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.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>dubbo-demo-protobuf</artifactId>
+        <groupId>org.apache.dubbo</groupId>
+        <version>2.7.2-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>dubbo-demo-protobuf-api</artifactId>
+</project>