Merge branch 'master-merged-performance-cloudnative'

# Conflicts:
#	dubbo-bootstrap/dubbo-bootstrap-spring/src/main/java/org/apache/dubbo/config/spring/beans/factory/annotation/ReferenceAnnotationBeanPostProcessor.java
#	dubbo-bootstrap/dubbo-bootstrap-spring/src/main/java/org/apache/dubbo/config/spring/util/ClassUtils.java
#	dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/router/tag/TagRouter.java
#	dubbo-common/pom.xml
#	dubbo-common/src/main/java/org/apache/dubbo/common/URL.java
#	dubbo-common/src/main/java/org/apache/dubbo/common/config/configcenter/Constants.java
#	dubbo-common/src/main/java/org/apache/dubbo/common/constants/CommonConstants.java
#	dubbo-common/src/main/java/org/apache/dubbo/common/utils/ReflectUtils.java
#	dubbo-common/src/main/java/org/apache/dubbo/common/utils/StringUtils.java
#	dubbo-common/src/main/java/org/apache/dubbo/common/utils/UrlUtils.java
#	dubbo-common/src/main/java/org/apache/dubbo/config/AbstractConfig.java
#	dubbo-common/src/main/java/org/apache/dubbo/config/AbstractInterfaceConfig.java
#	dubbo-common/src/main/java/org/apache/dubbo/config/AbstractReferenceConfig.java
#	dubbo-common/src/main/java/org/apache/dubbo/config/AbstractServiceConfig.java
#	dubbo-common/src/main/java/org/apache/dubbo/config/ConfigCenterConfig.java
#	dubbo-common/src/main/java/org/apache/dubbo/config/Constants.java
#	dubbo-common/src/main/java/org/apache/dubbo/rpc/support/ProtocolUtils.java
#	dubbo-compatible/src/main/java/com/alibaba/dubbo/common/Constants.java
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ReferenceConfig.java
#	dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/AbstractConfigTest.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/AbstractReferenceConfigTest.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/AbstractServiceConfigTest.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/ConfigCenterConfigTest.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/builders/AbstractReferenceBuilderTest.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/builders/AbstractServiceBuilderTest.java
#	dubbo-config/dubbo-config-api/src/test/java/org/apache/dubbo/config/url/UrlTestBase.java
#	dubbo-config/dubbo-config-spring/src/main/java/org/apache/dubbo/config/spring/ServiceBean.java
#	dubbo-configcenter/dubbo-configcenter-apollo/src/main/java/org/apache/dubbo/configcenter/support/apollo/ApolloDynamicConfiguration.java
#	dubbo-configcenter/dubbo-configcenter-consul/src/main/java/org/apache/dubbo/configcenter/consul/ConsulDynamicConfiguration.java
#	dubbo-configcenter/dubbo-configcenter-etcd/src/main/java/org/apache/dubbo/configcenter/support/etcd/EtcdDynamicConfiguration.java
#	dubbo-configcenter/dubbo-configcenter-zookeeper/src/main/java/org/apache/dubbo/configcenter/support/zookeeper/ZookeeperDynamicConfiguration.java
#	dubbo-dependencies-bom/pom.xml
#	dubbo-dependencies/dubbo-dependencies-zookeeper/pom.xml
#	dubbo-metadata-report/dubbo-metadata-report-api/src/main/java/org/apache/dubbo/metadata/integration/MetadataReportService.java
#	dubbo-metadata-report/dubbo-metadata-report-api/src/test/java/org/apache/dubbo/metadata/integration/MetadataReportServiceTest.java
#	dubbo-metadata-report/dubbo-metadata-report-etcd/src/test/java/org/apache/dubbo/metadata/store/etcd/EtcdMetadataReportTest.java
#	dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/Constants.java
#	dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyClientHandler.java
#	dubbo-remoting/dubbo-remoting-netty4/src/main/java/org/apache/dubbo/remoting/transport/netty4/NettyServerHandler.java
#	dubbo-remoting/dubbo-remoting-zookeeper/src/main/java/org/apache/dubbo/remoting/zookeeper/curator/CuratorZookeeperClient.java
#	dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/Constants.java
#	dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/ContextFilter.java
#	dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/GenericFilter.java
#	dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/interceptors/ConsumerContextClusterInterceptor.java
#	dubbo-rpc/dubbo-rpc-dubbo/src/test/java/org/apache/dubbo/rpc/service/GenericServiceTest.java
#	dubbo-rpc/dubbo-rpc-dubbo/src/test/java/org/apache/dubbo/rpc/validation/ValidationTest.java
#	dubbo-rpc/dubbo-rpc-rest/src/main/java/org/apache/dubbo/rpc/protocol/rest/RpcContextFilter.java
#	dubbo-rpc/dubbo-rpc-rest/src/test/java/org/apache/dubbo/rpc/protocol/rest/RestProtocolTest.java
#	pom.xml

.gitignore

@@ -6,6 +6,7 @@ target/
 *.zip
 *.tar
 *.tar.gz
+.flattened-pom.xml
 
 # eclipse ignore
 .settings/
@@ -35,3 +36,11 @@ Thumbs.db
 
 # license check result
 license-list
+
+# grpc compiler
+compiler/gradle.properties
+compiler/build/*
+compiler/.gradle/*
+
+# protobuf
+dubbo-serialization/dubbo-serialization-protobuf/build/*

LICENSE

@@ -243,3 +243,6 @@ https://github.com/edazdarevic/CIDRUtils. The project is licensed under a MIT Li
     * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     * THE SOFTWARE.
 
+This product contains a modified portion of 'proto-gen-grpc-java' - a protobuf plugin used to generate grpc-java stubs,
+ under a "Apache License 2.0" license, see https://github.com/grpc/grpc-java/blob/v1.22.1/NOTICE.txt. All files are placed
+ under '/dubbo/compiler'

NOTICE

@@ -12,3 +12,13 @@ Please visit the Netty web site for more information:
   * http://netty.io/
 
 Copyright 2014 The Netty Project
+
+
+This product contains code for the gRPC Project:
+
+The gRPC Project
+=================
+Please visit the gRPC web site for more information:
+  * http://grpc.io/
+
+Copyright 2014 The gRPC Project

compiler/.gradle/buildOutputCleanup/cache.properties

@@ -0,0 +1,2 @@
+#Tue Oct 09 11:40:48 CST 2018
+gradle.version=4.9

compiler/BUILD.bazel

@@ -0,0 +1,12 @@
+cc_binary(
+    name = "grpc_java_plugin",
+    srcs = [
+        "src/java_plugin/cpp/java_generator.cpp",
+        "src/java_plugin/cpp/java_generator.h",
+        "src/java_plugin/cpp/java_plugin.cpp",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_google_protobuf//:protoc_lib",
+    ],
+)

compiler/README.md

@@ -0,0 +1,202 @@
+# Dubbo customized version
+
+## Get Started, how to use
+1. Add maven dependency
+```xml
+    <build>
+        <extensions>
+            <extension>
+                <groupId>kr.motd.maven</groupId>
+                <artifactId>os-maven-plugin</artifactId>
+                <version>1.6.1</version>
+            </extension>
+        </extensions>
+        <plugins>
+            <plugin>
+                <groupId>org.xolstice.maven.plugins</groupId>
+                <artifactId>protobuf-maven-plugin</artifactId>
+                <version>0.5.1</version>
+                <configuration>
+                    <protocArtifact>com.google.protobuf:protoc:3.7.1:exe:${os.detected.classifier}</protocArtifact>
+                    <pluginId>grpc-java</pluginId>
+                    <pluginArtifact>org.apache.dubbo:protoc-gen-grpc-java:${proto_dubbo_plugin_version}:exe:${os.detected.classifier}</pluginArtifact>
+                    <outputDirectory>build/generated/source/proto/main/java</outputDirectory>
+                    <clearOutputDirectory>false</clearOutputDirectory>
+                    <!-- supports 'dubbo' and 'grpc' -->
+                    <pluginParameter>dubbo</pluginParameter>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>compile</goal>
+                            <goal>compile-custom</goal>
+                            <goal>test-compile</goal>
+                            <goal>test-compile-custom</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>build/generated/source/proto/main/java</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+```
+
+2. Decide which protocol to use: Dubbo or gRPC
+   * Dubbo, ` <pluginParameter>dubbo</pluginParameter>`
+   * gRPC, ` <pluginParameter>grpc</pluginParameter>`
+
+3. Define service using IDL
+```text
+syntax = "proto3";
+
+option java_multiple_files = true;
+option java_package = "org.apache.dubbo.demo";
+option java_outer_classname = "DemoServiceProto";
+option objc_class_prefix = "DEMOSRV";
+
+package demoservice;
+
+// The demo service definition.
+service DemoService {
+  rpc SayHello (HelloRequest) returns (HelloReply) {}
+}
+
+// The request message containing the user's name.
+message HelloRequest {
+  string name = 1;
+}
+
+// The response message containing the greetings
+message HelloReply {
+  string message = 1;
+}
+```
+
+4. Build
+mvn clean compile
+
+## Customized
+
+1. Dubbo Interface
+```java
+public interface IGreeter {
+
+    default public io.grpc.examples.helloworld.HelloReply sayHello(io.grpc.examples.helloworld.HelloRequest request) {
+       throw new UnsupportedOperationException("No need to override this method, extend XxxImplBase and override all methods it allows.");
+    }
+
+    default public com.google.common.util.concurrent.ListenableFuture<io.grpc.examples.helloworld.HelloReply> sayHelloAsync(
+        io.grpc.examples.helloworld.HelloRequest request) {
+       throw new UnsupportedOperationException("No need to override this method, extend XxxImplBase and override all methods it allows.");
+    }
+
+    public void sayHello(io.grpc.examples.helloworld.HelloRequest request,
+        io.grpc.stub.StreamObserver<io.grpc.examples.helloworld.HelloReply> responseObserver);
+
+}
+```
+
+2. Dubbo Stub
+```java
+public static DubboGreeterStub getDubboStub(io.grpc.Channel channel) {
+  return new DubboGreeterStub(channel);
+}
+
+public static class DubboGreeterStub implements IGreeter {
+
+    private GreeterBlockingStub blockingStub;
+    private GreeterFutureStub futureStub;
+    private GreeterStub stub;
+
+    public DubboGreeterStub(io.grpc.Channel channel) {
+       blockingStub = GreeterGrpc.newBlockingStub(channel);
+       futureStub = GreeterGrpc.newFutureStub(channel);
+       stub = GreeterGrpc.newStub(channel);
+    }
+
+    public io.grpc.examples.helloworld.HelloReply sayHello(io.grpc.examples.helloworld.HelloRequest request) {
+        return blockingStub.sayHello(request);
+    }
+
+    public com.google.common.util.concurrent.ListenableFuture<io.grpc.examples.helloworld.HelloReply> sayHelloAsync(
+        io.grpc.examples.helloworld.HelloRequest request) {
+        return futureStub.sayHello(requesthttps://github.com/apache/dubbo-samples.git);
+    }
+
+    public void sayHello(io.grpc.examples.helloworld.HelloRequest request,
+        io.grpc.stub.StreamObserver<io.grpc.examples.helloworld.HelloReply> responseObserver){
+        stub.sayHello(request, responseObserver);
+    }
+
+}
+
+```
+
+3. XxxImplBase implements DubboInterface
+```java
+public static abstract class GreeterImplBase implements io.grpc.BindableService, IGreeter {
+
+  @java.lang.Override
+  public final io.grpc.examples.helloworld.HelloReply sayHello(io.grpc.examples.helloworld.HelloRequest request) {
+     throw new UnsupportedOperationException("No need to override this method, extend XxxImplBase and override all methods it allows.");
+  }
+
+  @java.lang.Override
+  public final com.google.common.util.concurrent.ListenableFuture<io.grpc.examples.helloworld.HelloReply> sayHelloAsync(
+      io.grpc.examples.helloworld.HelloRequest request) {
+     throw new UnsupportedOperationException("No need to override this method, extend XxxImplBase and override all methods it allows.");
+  }
+
+  public void sayHello(io.grpc.examples.helloworld.HelloRequest request,
+      io.grpc.stub.StreamObserver<io.grpc.examples.helloworld.HelloReply> responseObserver) {
+      asyncUnimplementedUnaryCall(getSayHelloMethod(), responseObserver);
+  }
+
+  ...
+}
+```
+
+## Build locally
+
+To compile the plugin:
+```
+$ ../gradlew java_pluginExecutable
+```
+
+To publish to local repository
+```
+$ ../gradlew publishToMavenLocal
+```
+
+## Publish to maven repository
+
+Add gradle.properties
+```properties
+repositoryUser=user
+repositoryPasword=pwd
+```
+
+Then, run
+```
+$ ../gradlew publishMavenPublicationToDubboRepository
+```
+Notice current groupId is `com.alibaba`.
+
+
+Check [here](https://github.com/grpc/grpc-java/blob/master/compiler/README.md) for basic requirements and usage of protoc plugin.