Zipkin是一种分布式跟踪系统。它有助于收集解决微服务架构中延迟问题所需的时序数据。它管理这些数据的收集和查找。Zipkin的设计基于 Google Dapper论文。

应用程序用于向Zipkin报告时间数据。Zipkin用户界面还提供了一个依赖关系图，显示每个应用程序有多少跟踪请求。如果您正在解决延迟问题或错误问题，则可以根据应用程序，跟踪长度，注释或时间戳过滤或排序所有跟踪。选择跟踪后，您可以看到每个跨度所需的总跟踪时间百分比，从而可以识别问题应用程序。

这是翻译过来的原意，自己在这里想如果有个调用链，我们自己该怎么实现。要去质疑任何代码。

官方流程图：最关键的是Transport这个地方，通过几种方式传输给Conllector。如何在这里支持多种协议，有兴趣的可以进去看看源码。

开始示例，在这里通过一个项目调用不同的方法来进行测试。

先下载Zipkin的web UI，通过java -jar zipkin.jar执行

项目结构：

pom.xml

<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <optional>true</optional>
</dependency>
<!-- zipkin-->
<dependency>
   <groupId>io.zipkin.brave</groupId>
   <artifactId>brave-core</artifactId>
   <version>3.10.0</version>
</dependency>
<dependency>
   <groupId>io.zipkin.brave</groupId>
   <artifactId>brave-spancollector-http</artifactId>
   <version>3.10.0</version>
</dependency>
<dependency>
   <groupId>io.zipkin.brave</groupId>
   <artifactId>brave-web-servlet-filter</artifactId>
   <version>3.10.0</version>
</dependency>
<dependency>
   <groupId>io.zipkin.brave</groupId>
   <artifactId>brave-okhttp</artifactId>
   <version>3.10.0</version>
</dependency>
<!-- zipkin-->

application.properties

server.port=9000

##########请求的项目名##########
server.servlet.context-path=/zipkinTest


##########zipKin################
zipkin.serviceName=zipkin-test
zipkin.url=http://localhost:9411
zipkin.connectTimeout=6000
zipkin.readTimeout=6000
zipkin.flushInterval=1
zipkin.compressionEnabled=true

server.port 访问端口号
server.servlet.context-path 访问项目名
zipkin.serviceName 服务名
zipkin.url  Zipkin的web ui访问地址
zipkin.connectTimeout 连接时间
zipkin.readTimeout 读数据时间
zipkin.flushInterval 采集率

zipkin.compressionEnabled 是否压缩

ZipkinProperties.java

package com.cms.zipkin;

import com.github.kristofa.brave.Brave;
import com.github.kristofa.brave.EmptySpanCollectorMetricsHandler;
import com.github.kristofa.brave.Sampler;
import com.github.kristofa.brave.SpanCollector;
import com.github.kristofa.brave.http.DefaultSpanNameProvider;
import static com.github.kristofa.brave.Brave.Builder;
import static com.github.kristofa.brave.http.HttpSpanCollector.Config;
import static com.github.kristofa.brave.http.HttpSpanCollector.create;
import com.github.kristofa.brave.okhttp.BraveOkHttpRequestResponseInterceptor;
import com.github.kristofa.brave.servlet.BraveServletFilter;
import lombok.Data;
import okhttp3.OkHttpClient;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @program: zjsz-user
 * @description: Zipkin配置
 * @author: Mr.Yang
 * @create: 2018-07-03 21:58
 **/
@Data
@Configuration
@ConfigurationProperties(prefix = ZipkinProperties.ZIPKIN_PREFIX)
public class ZipkinProperties {

    public static final String ZIPKIN_PREFIX = "zipkin";

    /**
     * 服务名称
     */
    private String serviceName;

    /**
     * zipkin地址
     */
    private String url;

    /**
     * 连接时间
     */
    private int connectTimeout;

    /**
     * 读取时间
     */
    private int readTimeout;

    /**
     * 每间隔多少秒执行一次Span信息上传
     */
    private int flushInterval;

    /**
     * 是否启动压缩
     */
    private boolean compressionEnabled;

    /**
     * @Description: span（一次请求信息或者一次链路调用）信息收集器
     * @Param:
     * @return: SpanCollector 控制器
     * @Author: Mr.Yang
     * @Date: 2018/7/3 0002
     */
    @Bean
    public SpanCollector spanCollector() {
        Config config = Config.builder()
                // 默认false，span在transport之前是否会被gzipped
                .compressionEnabled(compressionEnabled)
                .connectTimeout(connectTimeout)
                .flushInterval(flushInterval)
                .readTimeout(readTimeout)
                .build();
        return create(url, config, new EmptySpanCollectorMetricsHandler());
    }

    /**
     * @Description: 作为各调用链路，只需要负责将指定格式的数据发送给zipkin
     * @Param:
     * @return:
     * @Author: Mr.Yang
     * @Date: 2018/7/3 0002
     */
    @Bean
    public Brave brave(SpanCollector spanCollector) {
        //调用服务的名称
        Builder builder = new Builder(serviceName);
        builder.spanCollector(spanCollector);
        //采集率
        builder.traceSampler(Sampler.ALWAYS_SAMPLE);
        return builder.build();
    }


    /**
     * @Description: 设置server的（服务端收到请求和服务端完成处理，并将结果发送给客户端）过滤器
     * @Param:
     * @return: 过滤器
     * @Author: Mr.Yang
     * @Date: 2018/7/3 0002
     */
    @Bean
    public BraveServletFilter braveServletFilter(Brave brave) {
        BraveServletFilter filter = new BraveServletFilter(brave.serverRequestInterceptor(),
                brave.serverResponseInterceptor(), new DefaultSpanNameProvider());
        return filter;
    }

    /**
     * @Description: 设置client的（发起请求和获取到服务端返回信息）拦截器
     * @Param:
     * @return: OkHttpClient 返回请求实例
     * @Author: Mr.Yang
     * @Date: 2018/7/3 0002
     */
    @Bean
    public OkHttpClient okHttpClient(Brave brave) {
        OkHttpClient httpClient = new OkHttpClient.Builder()
                .addInterceptor(new BraveOkHttpRequestResponseInterceptor(
                        brave.clientRequestInterceptor(),
                        brave.clientResponseInterceptor(),
                        new DefaultSpanNameProvider())).build();
        return httpClient;
    }
}

 ZipkinBraveController1 

package com.cms.contorller;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @program: zjsz-user
 * @description: 服务一
 * @author: Mr.Yang
 * @create: 2018-07-03 21:58
 **/
@RestController
@RequestMapping("server1")
public class ZipkinBraveController1 {


    @Autowired
    private OkHttpClient client;

    /**
    * @Description: 第一步调用
    * @Param:
    * @return:  字符串
    * @Author: Mr.Yang
    * @Date: 2018/7/3
    */
    @RequestMapping("/zipkin")
    public String service1() throws Exception {
        Thread.sleep(100);
        Request request = new Request.Builder().url("http://localhost:9000/zipkinTest/server2/zipkin").build();
        Response response = client.newCall(request).execute();
        return response.body().string();
    }

}

ZipkinBraveController2

package com.cms.contorller;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @program: zjsz-user
 * @description: 服务二
 * @author: Mr.Yang
 * @create: 2018-07-03 21:58
 **/
@RestController
@RequestMapping("server2")
public class ZipkinBraveController2 {

    @Autowired
    private OkHttpClient client;

    /**
     * @Description: 第二步调用
     * @Param:
     * @return:  字符串
     * @Author: Mr.Yang
     * @Date: 2018/7/3
     */
    @RequestMapping("/zipkin")
    public String service1() throws Exception {
        Thread.sleep(100);
        Request request = new Request.Builder().url("http://localhost:9000/zipkinTest/server3/zipkin").build();
        Response response = client.newCall(request).execute();
        return response.body().string();
    }

}

ZipkinBraveController3

package com.cms.contorller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


/**
 * @program: zjsz-user
 * @description: 服务三
 * @author: Mr.Yang
 * @create: 2018-07-03 21:58
 **/
@RestController
@RequestMapping("server3")
public class ZipkinBraveController3 {

    /**
     * @Description: 第三步调用
     * @Param:
     * @return:  字符串
     * @Author: Mr.Yang
     * @Date: 2018/7/3
     */
    @RequestMapping("/zipkin")
    public String service1() throws Exception {
        Thread.sleep(200);

        return "你好,欢迎进入Zipkin的世界";
    }

}

项目启动后，访问http://localhost:9000/zipkinTest/server1/zipkin 就可以看到

你好,欢迎进入Zipkin的世界

我们通过http://localhost:9411/zipkin 查看zipkin的web UI

查看每条调用链的详情

后面还会讲关于zipkin将数据整合到Mysql、Elasticsearch中去。