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grpc例子

grpc是google在github于2015年开源的一款RPC框架，虽然protobuf很早google就开源了，但是google一直没推出正式的开源框架，导致github上基于protobuf的rpc五花八门，国内比较著名的有百度的sofa-pbrpc，但是遗憾的是soft-pbrpc没有对应的java实现版本。rgpc还有一个独立的官网：http://www.grpc.io/，目前已经支持的语言有 C, C++, Java, Go, Node.js, Python, Ruby, Objective-C, PHP 、 C#. grpc最大的特点是基于protobuf + http2 协议，http2协议虽然还未正式定稿，但从目前得知的内容来看，潜力巨大。下面是grpc基本的hello world的示例：

一、grpc-contract

还是按老套路，把服务涉及的对象定义、接口定义抽象出来，下面是项目结构图：

pom.xml的内容如下：

  1 <?xml version="1.0" encoding="UTF-8"?>
  2 <project xmlns="http://maven.apache.org/POM/4.0.0"
  3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5     <modelVersion>4.0.0</modelVersion>
  6 
  7     <groupId>yjmyzz.grpc</groupId>
  8     <artifactId>grpc-contract</artifactId>
  9     <version>1.0</version>
 10 
 11 
 12     <dependencies>
 13 
 14         <dependency>
 15             <groupId>junit</groupId>
 16             <artifactId>junit</artifactId>
 17             <version>4.10</version>
 18         </dependency>
 19 
 20         <dependency>
 21             <groupId>com.google.protobuf</groupId>
 22             <artifactId>protobuf-java</artifactId>
 23             <version>3.0.0-beta-1</version>
 24         </dependency>
 25 
 26         <dependency>
 27             <groupId>io.grpc</groupId>
 28             <artifactId>grpc-all</artifactId>
 29             <version>0.8.0</version>
 30         </dependency>
 31 
 32     </dependencies>
 33 
 34     <!--下面这个节点可选-->
 35     <pluginRepositories>
 36         <pluginRepository>
 37             <releases>
 38                 <updatePolicy>never</updatePolicy>
 39             </releases>
 40             <snapshots>
 41                 <enabled>false</enabled>
 42             </snapshots>
 43             <id>central</id>
 44             <name>Central Repository</name>
 45             <url>https://repo.maven.apache.org/maven2</url>
 46         </pluginRepository>
 47         <pluginRepository>
 48             <id>protoc-plugin</id>
 49             <url>https://dl.bintray.com/sergei-ivanov/maven/</url>
 50         </pluginRepository>
 51     </pluginRepositories>
 52 
 53 
 54     <build>
 55         <extensions>
 56             <extension>
 57                 <groupId>kr.motd.maven</groupId>
 58                 <artifactId>os-maven-plugin</artifactId>
 59                 <version>1.4.0.Final</version>
 60             </extension>
 61         </extensions>
 62         <plugins>
 63             <!--用于根据proto文件生成java类的插件-->
 64             <plugin>
 65                 <groupId>com.google.protobuf.tools</groupId>
 66                 <artifactId>maven-protoc-plugin</artifactId>
 67                 <version>0.4.2</version>
 68                 <configuration>
 69                     <protocArtifact>com.google.protobuf:protoc:3.0.0-alpha-3.1:exe:${os.detected.classifier}
 70                     </protocArtifact>
 71                     <pluginId>grpc-java</pluginId>
 72                     <pluginArtifact>io.grpc:protoc-gen-grpc-java:0.8.0:exe:${os.detected.classifier}</pluginArtifact>
 73                 </configuration>
 74                 <executions>
 75                     <execution>
 76                         <goals>
 77                             <goal>compile</goal>
 78                             <goal>compile-custom</goal>
 79                         </goals>
 80                     </execution>
 81                 </executions>
 82             </plugin>
 83 
 84             <!--生成源代码jar包的插件（可选）-->
 85             <plugin>
 86                 <artifactId>maven-source-plugin</artifactId>
 87                 <version>2.4</version>
 88                 <executions>
 89                     <execution>
 90                         <phase>package</phase>
 91                         <goals>
 92                             <goal>jar-no-fork</goal>
 93                         </goals>
 94                     </execution>
 95                 </executions>
 96             </plugin>
 97 
 98         </plugins>
 99     </build>
100 </project>

demo_service_dto.proto内容如下：

syntax = "proto3";

package yjmyzz.grpc.study.dto;

option java_multiple_files = true;
option java_outer_classname = "DemoServiceDto";

message PingRequest {
     string in=1;
}

message PingResponse {
     string out=1;
}

message QueryParameter {
     int32 ageStart = 1;
     int32 ageEnd = 2;
}

message Person {
     int32 age = 1;
     string name = 2;
     bool sex=3;
     double salary=4;
     int32 childrenCount=5;
}

message PersonList{
     repeated Person items=1;
}

注：grpc要求protobuf必须使用3.0以上版本

demo_service.proto内容如下：

View Code

mvn install 后，会自动在target下生成相应的java class类

二、grpc-server

pom.xml文件如下：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>yjmyzz.grpc</groupId>
 8     <artifactId>grpc-server</artifactId>
 9     <version>1.0</version>
10 
11 
12     <dependencies>
13         <dependency>
14             <groupId>com.google.protobuf</groupId>
15             <artifactId>protobuf-java</artifactId>
16             <version>3.0.0-beta-1</version>
17         </dependency>
18 
19         <dependency>
20             <groupId>yjmyzz.grpc</groupId>
21             <artifactId>grpc-contract</artifactId>
22             <version>1.0</version>
23         </dependency>
24 
25         <dependency>
26             <groupId>io.grpc</groupId>
27             <artifactId>grpc-all</artifactId>
28             <version>0.8.0</version>
29         </dependency>
30 
31         <dependency>
32             <groupId>junit</groupId>
33             <artifactId>junit</artifactId>
34             <version>4.10</version>
35         </dependency>
36 
37     </dependencies>
38 
39 
40 </project>

先对服务接口提供实现：

package yjmyzz.grpc.study.service.impl;
 
import io.grpc.stub.StreamObserver;
import yjmyzz.grpc.study.dto.*;
import yjmyzz.grpc.study.service.DemoServiceGrpc;
 
import java.util.ArrayList;
import java.util.List;
 
 
public class DemoServiceImpl implements DemoServiceGrpc.DemoService {
    public void ping(PingRequest pingRequest, StreamObserver<PingResponse> streamObserver) {
        PingResponse reply = PingResponse.newBuilder().setOut("pong => " + pingRequest.getIn()).build();
        streamObserver.onValue(reply);
        streamObserver.onCompleted();
    }
 
    public void getPersonList(QueryParameter queryParameter, StreamObserver<PersonList> streamObserver) {
        //System.out.println(queryParameter.getAgeStart() + "-" + queryParameter.getAgeEnd());
        PersonList.Builder personListBuilder = PersonList.newBuilder();
        Person.Builder builder = Person.newBuilder();
        List<Person> list = new ArrayList<Person>();
        for (short i = 0; i < 10; i++) {
            list.add(builder.setAge(i).setChildrenCount(i).setName("test" + i).setSex(true).build());
        }
        personListBuilder.addAllItems(list);
        streamObserver.onValue(personListBuilder.build());
        streamObserver.onCompleted();
    }
}

和前面thrift、avro的helloworld一样，这里的实现只是意思一下，方便测试而已。

grpc的server端是基于Netty的（当然还有OKHttp的实现，详情见github项目主页），下面是server端的代码：

package yjmyzz.grpc.study.server;
 
import io.grpc.ServerImpl;
import io.grpc.inprocess.InProcessServerBuilder;
import io.grpc.netty.NettyServerBuilder;
import yjmyzz.grpc.study.service.DemoServiceGrpc;
import yjmyzz.grpc.study.service.impl.DemoServiceImpl;
 
 
public class DemoServiceServer {
 
    private int port = 50051;
    private ServerImpl server;
 
    private void start() throws Exception {
        server = NettyServerBuilder.forPort(port)
                .addService(DemoServiceGrpc.bindService(new DemoServiceImpl()))
                .build().start();
 
        server = InProcessServerBuilder.forName("testServer")
                .addService(DemoServiceGrpc.bindService(new DemoServiceImpl()))
                .build().start();
 
        System.out.println("Server started, listening on " + port);
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                System.out.println("*** shutting down gRPC server since JVM is shutting down");
                DemoServiceServer.this.stop();
                System.out.println("*** server shut down");
            }
        });
    }
 
    private void stop() {
        if (server != null) {
            server.shutdown();
        }
    }
 
 
    public static void main(String[] args) throws Exception {
        final DemoServiceServer server = new DemoServiceServer();
        server.start();
    }
 
}

三、grpc-client

pom.xml内容：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xmlns="http://maven.apache.org/POM/4.0.0"
 3          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 5     <modelVersion>4.0.0</modelVersion>
 6 
 7     <groupId>yjmyzz.grpc</groupId>
 8     <artifactId>grpc-client</artifactId>
 9     <version>1.0</version>
10 
11     <dependencies>
12 
13         <dependency>
14             <groupId>com.google.protobuf</groupId>
15             <artifactId>protobuf-java</artifactId>
16             <version>3.0.0-beta-1</version>
17         </dependency>
18 
19         <dependency>
20             <groupId>yjmyzz.grpc</groupId>
21             <artifactId>grpc-contract</artifactId>
22             <version>1.0</version>
23         </dependency>
24 
25         <dependency>
26             <groupId>io.grpc</groupId>
27             <artifactId>grpc-all</artifactId>
28             <version>0.8.0</version>
29         </dependency>
30 
31         <dependency>
32             <groupId>junit</groupId>
33             <artifactId>junit</artifactId>
34             <version>4.10</version>
35         </dependency>
36 
37     </dependencies>
38 
39 </project>

Client端代码：

package yjmyzz.grpc.study.client;
 
import io.grpc.ChannelImpl;
import io.grpc.netty.NegotiationType;
import io.grpc.netty.NettyChannelBuilder;
import yjmyzz.grpc.study.dto.PersonList;
import yjmyzz.grpc.study.dto.PingRequest;
import yjmyzz.grpc.study.dto.PingResponse;
import yjmyzz.grpc.study.dto.QueryParameter;
import yjmyzz.grpc.study.service.DemoServiceGrpc;
 
import java.util.concurrent.TimeUnit;
 
public class DemoServiceClient {
 
    private final ChannelImpl channel;
    private final DemoServiceGrpc.DemoServiceBlockingStub blockingStub;
 
    public DemoServiceClient(String host, int port) {
        channel =
                NettyChannelBuilder.forAddress(host, port).negotiationType(NegotiationType.PLAINTEXT)
                        .build();
 
 
        blockingStub = DemoServiceGrpc.newBlockingStub(channel);
    }
 
    public void shutdown() throws InterruptedException {
        channel.shutdown().awaitTermination(5, TimeUnit.SECONDS);
    }
 
    public void ping(String name) {
        try {
            System.out.println("Will try to ping " + name + " ...");
            PingRequest request = PingRequest.newBuilder().setIn(name).build();
            PingResponse response = blockingStub.ping(request);
            System.out.println("ping: " + response.getOut());
        } catch (RuntimeException e) {
            System.out.println("RPC failed:" + e.getMessage());
            return;
        }
    }
 
    public void getPersonList(QueryParameter parameter) {
        try {
            //System.out.println("Will try to getPersonList " + parameter + " ...");
            PersonList response = blockingStub.getPersonList(parameter);
            //System.out.println("items count: " + response.getItemsCount());
//            for (Person p : response.getItemsList()) {
//                System.out.println(p);
//            }
        } catch (RuntimeException e) {
            System.out.println("RPC failed:" + e.getMessage());
            return;
        }
    }
 
 
    public static void main(String[] args) throws Exception {
        DemoServiceClient client = new DemoServiceClient("localhost", 50051);
        try {
            client.ping("a");
 
            int max = 100000;
            Long start = System.currentTimeMillis();
 
            for (int i = 0; i < max; i++) {
                client.getPersonList(getParameter());
            }
            Long end = System.currentTimeMillis();
            Long elapse = end - start;
            int perform = Double.valueOf(max / (elapse / 1000d)).intValue();
 
            System.out.print("rgpc " + max + " 次NettyServer调用，耗时：" + elapse + "毫秒，平均" + perform + "次/秒");
        } finally {
            client.shutdown();
        }
    }
 
    private static QueryParameter getParameter() {
        return QueryParameter.newBuilder().setAgeStart(5).setAgeEnd(50).build();
    }
}

在笔记本测试的结果：

Will try to ping a ...
ping: pong => a
rgpc 100000 次NettyServer调用，耗时：36409毫秒，平均2746次/秒

基本上在每秒3k次的数量级，相对thrift（1w+）、avro(5k+)来讲，目前的差距还是很明显的，但是新事物成长总是需要时间，再给google一段时间，相信以后会让大家感到惊艳的。

在序列化方面，也做了一个跟之前thrift、avro类似的测试：

@Test
public void test() throws InvalidProtocolBufferException {
 
    QueryParameter queryParameter = QueryParameter.newBuilder().setAgeStart(1).setAgeEnd(5).build();
    byte[] bytes1 = queryParameter.toByteArray();
    System.out.println("Protobuf 3.0 二进制序列后的byte数组长度：" + bytes1.length);
 
    QueryParameter result = QueryParameter.parseFrom(bytes1);
    System.out.println(queryParameter.getAgeStart() + " - " + result.getAgeStart());
 
}

输出：

Protobuf 3.0 二进制序列后的byte数组长度：4
1 - 1

在2进制序列化后的大小方面，protobuf 3大体跟thrift的TCompactProtocal（大小5）接近，比avro（大小2）略差。

文中示例源码下载：http://code.taobao.org/svn/grpc-demo/

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原文地址：https://www.cnblogs.com/hujihon/p/6023660.html