New context carrier.

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/conf/Config.java

@@ -134,13 +134,5 @@ public class Config {
              */
             public static boolean TRACE_PARAM = false;
         }
-
-        public static class Propagation {
-
-            /**
-             * The header name of cross process propagation data.
-             */
-            public static String HEADER_NAME = "sw3";
-        }
     }
 }

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/CarrierItem.java

+package org.skywalking.apm.agent.core.context;
+
+import java.util.Iterator;
+
+/**
+ * @author wusheng
+ */
+public class CarrierItem implements Iterator<CarrierItem> {
+    private String headKey;
+    private String headValue;
+    private CarrierItem next;
+
+    public CarrierItem(String headKey, String headValue) {
+        this.headKey = headKey;
+        this.headValue = headValue;
+        next = null;
+    }
+
+    public CarrierItem(String headKey, String headValue, CarrierItem next) {
+        this.headKey = headKey;
+        this.headValue = headValue;
+        this.next = next;
+    }
+
+    public String getHeadKey() {
+        return headKey;
+    }
+
+    public String getHeadValue() {
+        return headValue;
+    }
+
+    public void setHeadValue(String headValue) {
+        this.headValue = headValue;
+    }
+
+    @Override
+    public boolean hasNext() {
+        return next != null;
+    }
+
+    @Override
+    public CarrierItem next() {
+        return next;
+    }
+
+    @Override
+    public void remove() {
+
+    }
+}

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/ContextCarrier.java

@@ -59,13 +59,18 @@ public class ContextCarrier implements Serializable {
      */
     private DistributedTraceId primaryDistributedTraceId;
 
+    public CarrierItem items() {
+        SW3CarrierItem carrierItem = new SW3CarrierItem(this, null);
+        return carrierItem;
+    }
+
     /**
      * Serialize this {@link ContextCarrier} to a {@link String},
      * with '|' split.
      *
      * @return the serialization string.
      */
-    public String serialize() {
+    String serialize() {
         if (this.isValid()) {
             return StringUtil.join('|',
                 this.getTraceSegmentId().encode(),
@@ -75,7 +80,7 @@ public class ContextCarrier implements Serializable {
                 this.getPeerHost(),
                 this.getEntryOperationName(),
                 this.getParentOperationName(),
-                this.getPrimaryDistributedTraceId().toBase64());
+                this.getPrimaryDistributedTraceId().encode());
         } else {
             return "";
         }
@@ -86,7 +91,7 @@ public class ContextCarrier implements Serializable {
      *
      * @param text carries {@link #traceSegmentId} and {@link #spanId}, with '|' split.
      */
-    public ContextCarrier deserialize(String text) {
+    ContextCarrier deserialize(String text) {
         if (text != null) {
             String[] parts = text.split("\\|", 8);
             if (parts.length == 8) {

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/SW3CarrierItem.java

+package org.skywalking.apm.agent.core.context;
+
+/**
+ * @author wusheng
+ */
+public class SW3CarrierItem extends CarrierItem {
+    private static final String HEAD_NAME = "sw3";
+    private ContextCarrier carrier;
+
+    public SW3CarrierItem(ContextCarrier carrier, CarrierItem next) {
+        super(HEAD_NAME, carrier.serialize(), next);
+        this.carrier = carrier;
+    }
+
+    @Override
+    public void setHeadValue(String headValue) {
+        carrier.deserialize(headValue);
+    }
+}

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/TraceContextCarrierItem.java

+package org.skywalking.apm.agent.core.context;
+
+/**
+ * @author wusheng
+ */
+public class TraceContextCarrierItem extends CarrierItem {
+    private static final String HEAD_NAME = "Trace-Context";
+
+    public TraceContextCarrierItem(String headValue, CarrierItem next) {
+        super(HEAD_NAME, headValue, next);
+    }
+}

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/ids/DistributedTraceId.java

@@ -26,7 +26,7 @@ public abstract class DistributedTraceId {
         this.id = new ID(id);
     }
 
-    public String toBase64() {
+    public String encode() {
         return id.encode();
     }
 

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/ids/ID.java

 package org.skywalking.apm.agent.core.context.ids;
 
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import org.skywalking.apm.agent.core.context.ids.base64.Base64;
 import org.skywalking.apm.network.proto.UniqueId;
 
 /**
  * @author wusheng
  */
 public class ID {
-    private static final Base64.Encoder ENCODER = Base64.getEncoder();
-    private static final Base64.Decoder DECODER = Base64.getDecoder();
-
     private long part1;
     private long part2;
     private long part3;
@@ -25,31 +19,15 @@ public class ID {
     }
 
     public ID(String encodingString) {
+        String[] idParts = encodingString.split(".", 3);
         int index = 0;
         for (int part = 0; part < 3; part++) {
-            String encodedString;
-            char potentialTypeChar = encodingString.charAt(index);
-            long value;
-            if (potentialTypeChar == '#') {
-                encodedString = encodingString.substring(index + 1, index + 5);
-                index += 5;
-                value = ByteBuffer.wrap(DECODER.decode(encodedString)).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(0);
-            } else if (potentialTypeChar == '$') {
-                encodedString = encodingString.substring(index + 1, index + 9);
-                index += 9;
-                value = ByteBuffer.wrap(DECODER.decode(encodedString)).order(ByteOrder.LITTLE_ENDIAN).asIntBuffer().get(0);
-            } else {
-                encodedString = encodingString.substring(index, index + 12);
-                index += 12;
-                value = ByteBuffer.wrap(DECODER.decode(encodedString)).order(ByteOrder.LITTLE_ENDIAN).asLongBuffer().get(0);
-            }
-
             if (part == 0) {
-                part1 = value;
+                part1 = Long.parseLong(idParts[part]);
             } else if (part == 1) {
-                part2 = value;
+                part2 = Long.parseLong(idParts[part]);
             } else {
-                part3 = value;
+                part3 = Long.parseLong(idParts[part]);
             }
 
         }
@@ -57,36 +35,11 @@ public class ID {
 
     public String encode() {
         if (encoding == null) {
-            encoding = long2Base64(part1) + long2Base64(part2) + long2Base64(part3);
+            encoding = toString();
         }
         return encoding;
     }
 
-    private String long2Base64(long partN) {
-        if (partN < 0) {
-            throw new IllegalArgumentException("negative value.");
-        }
-        if (partN < 32768) {
-            // 0 - 32767
-            // "#" as a prefix of a short value with base64 encoding.
-            byte[] data = new byte[2];
-            ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().put((short)partN);
-            return '#' + ENCODER.encodeToString(data);
-        } else if (partN <= 2147483647) {
-            // 32768 - 2147483647
-            // "$" as a prefix of an integer value (greater than a short) with base64 encoding.
-            byte[] data = new byte[4];
-            ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asIntBuffer().put((int)partN);
-            return '$' + ENCODER.encodeToString(data);
-        } else {
-            // > 2147483647
-            // a long value (greater than an integer)
-            byte[] data = new byte[8];
-            ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asLongBuffer().put(partN);
-            return ENCODER.encodeToString(data);
-        }
-    }
-
     @Override public String toString() {
         return part1 + "." + part2 + '.' + part3;
     }

apm-sniffer/apm-sdk-plugin/dubbo-plugin/src/main/java/org/skywalking/apm/plugin/dubbo/DubboInterceptor.java

@@ -6,7 +6,7 @@ import com.alibaba.dubbo.rpc.Invoker;
 import com.alibaba.dubbo.rpc.Result;
 import com.alibaba.dubbo.rpc.RpcContext;
 import java.lang.reflect.Method;
-import org.skywalking.apm.agent.core.conf.Config;
+import org.skywalking.apm.agent.core.context.CarrierItem;
 import org.skywalking.apm.agent.core.context.ContextCarrier;
 import org.skywalking.apm.agent.core.context.ContextManager;
 import org.skywalking.apm.agent.core.context.tag.Tags;
@@ -16,28 +16,20 @@ import org.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance
 import org.skywalking.apm.agent.core.plugin.interceptor.enhance.InstanceMethodsAroundInterceptor;
 import org.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptResult;
 import org.skywalking.apm.network.trace.component.ComponentsDefine;
-import org.skywalking.apm.plugin.dubbox.BugFixActive;
-import org.skywalking.apm.plugin.dubbox.SWBaseBean;
 
 /**
  * {@link DubboInterceptor} define how to enhance class {@link com.alibaba.dubbo.monitor.support.MonitorFilter#invoke(Invoker,
  * Invocation)}. the trace context transport to the provider side by {@link RpcContext#attachments}.but all the version
- * of dubbo framework below 2.8.3 don't support {@link RpcContext#attachments}, we support another way to support it. it
- * is that all request parameters of dubbo service need to extend {@link SWBaseBean}, and {@link DubboInterceptor} will
- * inject the trace context data to the {@link SWBaseBean} bean and extract the trace context data from {@link
- * SWBaseBean}, or the trace context data will not transport to the provider side.
+ * of dubbo framework below 2.8.3 don't support {@link RpcContext#attachments}, we support another way to support it.
  *
  * @author zhangxin
  */
 public class DubboInterceptor implements InstanceMethodsAroundInterceptor {
-
     /**
-     * <h2>Consumer:</h2> The serialized trace context data will inject the first param that extend {@link SWBaseBean}
-     * of dubbo service if the method {@link BugFixActive#active()} be called. or the serialized context data will
+     * <h2>Consumer:</h2> The serialized trace context data will
      * inject to the {@link RpcContext#attachments} for transport to provider side.
      * <p>
-     * <h2>Provider:</h2> The serialized trace context data will extract from the first param that extend {@link
-     * SWBaseBean} of dubbo service if the method {@link BugFixActive#active()} be called. or it will extract from
+     * <h2>Provider:</h2> The serialized trace context data will extract from
      * {@link RpcContext#attachments}. current trace segment will ref if the serialize context data is not null.
      */
     @Override
@@ -56,20 +48,19 @@ public class DubboInterceptor implements InstanceMethodsAroundInterceptor {
         if (isConsumer) {
             final ContextCarrier contextCarrier = new ContextCarrier();
             span = ContextManager.createExitSpan(generateOperationName(requestURL, invocation), contextCarrier, host + ":" + port);
-            if (!BugFixActive.isActive()) {
-                //invocation.getAttachments().put("contextData", contextDataStr);
-                //@see https://github.com/alibaba/dubbo/blob/dubbo-2.5.3/dubbo-rpc/dubbo-rpc-api/src/main/java/com/alibaba/dubbo/rpc/RpcInvocation.java#L154-L161
-                rpcContext.getAttachments().put(Config.Plugin.Propagation.HEADER_NAME, contextCarrier.serialize());
-            } else {
-                fix283SendNoAttachmentIssue(invocation, contextCarrier);
+            //invocation.getAttachments().put("contextData", contextDataStr);
+            //@see https://github.com/alibaba/dubbo/blob/dubbo-2.5.3/dubbo-rpc/dubbo-rpc-api/src/main/java/com/alibaba/dubbo/rpc/RpcInvocation.java#L154-L161
+            CarrierItem items = contextCarrier.items();
+            while (items.hasNext()) {
+                CarrierItem next = items.next();
+                rpcContext.getAttachments().put(next.getHeadKey(), next.getHeadValue());
             }
         } else {
-
-            ContextCarrier contextCarrier;
-            if (!BugFixActive.isActive()) {
-                contextCarrier = new ContextCarrier().deserialize(rpcContext.getAttachment(Config.Plugin.Propagation.HEADER_NAME));
-            } else {
-                contextCarrier = fix283RecvNoAttachmentIssue(invocation);
+            ContextCarrier contextCarrier = new ContextCarrier();
+            CarrierItem items = contextCarrier.items();
+            while (items.hasNext()) {
+                CarrierItem next = items.next();
+                next.setHeadValue(rpcContext.getAttachment(next.getHeadKey()));
             }
 
             span = ContextManager.createEntrySpan(generateOperationName(requestURL, invocation), contextCarrier);
@@ -143,33 +134,4 @@ public class DubboInterceptor implements InstanceMethodsAroundInterceptor {
         requestURL.append(generateOperationName(url, invocation));
         return requestURL.toString();
     }
-
-    /**
-     * Set the trace context.
-     *
-     * @param contextCarrier {@link ContextCarrier}.
-     */
-    private void fix283SendNoAttachmentIssue(Invocation invocation, ContextCarrier contextCarrier) {
-        for (Object parameter : invocation.getArguments()) {
-            if (parameter instanceof SWBaseBean) {
-                ((SWBaseBean)parameter).setTraceContext(contextCarrier.serialize());
-                return;
-            }
-        }
-    }
-
-    /**
-     * Fetch the trace context by using {@link Invocation#getArguments()}.
-     *
-     * @return trace context data.
-     */
-    private ContextCarrier fix283RecvNoAttachmentIssue(Invocation invocation) {
-        for (Object parameter : invocation.getArguments()) {
-            if (parameter instanceof SWBaseBean) {
-                return new ContextCarrier().deserialize(((SWBaseBean)parameter).getTraceContext());
-            }
-        }
-
-        return null;
-    }
 }

apm-sniffer/apm-sdk-plugin/dubbo-plugin/src/main/java/org/skywalking/apm/plugin/dubbox/BugFixActive.java

-package org.skywalking.apm.plugin.dubbox;
-
-/**
- * {@link BugFixActive#active} is an flag that present the dubbox version is below 2.8.3, The version 2.8.3 of dubbox
- * don't support attachment. so skywalking provided another way to support the function that transport the serialized
- * context data. The way is that all parameters of dubbo service need to extend {@link SWBaseBean}, {@link
- * org.skywalking.apm.plugin.dubbo.DubboInterceptor} fetch the serialized context data by using {@link
- * SWBaseBean#getTraceContext()}.
- *
- * @author zhangxin
- */
-public final class BugFixActive {
-
-    private static boolean ACTIVE = false;
-
-    /**
-     * Set active status, before startup dubbo remote.
-     */
-    public static void active() {
-        BugFixActive.ACTIVE = true;
-    }
-
-    public static boolean isActive() {
-        return BugFixActive.ACTIVE;
-    }
-
-}

apm-sniffer/apm-sdk-plugin/dubbo-plugin/src/main/java/org/skywalking/apm/plugin/dubbox/SWBaseBean.java

-package org.skywalking.apm.plugin.dubbox;
-
-import java.io.Serializable;
-
-/**
- * All the request parameter of dubbox service need to extend {@link SWBaseBean} to transport
- * the serialized trace context to the provider side if the version of dubbox is below 2.8.3.
- *
- * @author zhangxin
- */
-public class SWBaseBean implements Serializable {
-    /**
-     * Serialized trace context.
-     */
-    private String traceContext;
-
-    public String getTraceContext() {
-        return traceContext;
-    }
-
-    public void setTraceContext(String traceContext) {
-        this.traceContext = traceContext;
-    }
-}

apm-sniffer/apm-sdk-plugin/dubbo-plugin/src/test/java/org/skywalking/apm/plugin/dubbo/DubboInterceptorTest.java

@@ -7,7 +7,6 @@ import com.alibaba.dubbo.rpc.Result;
 import com.alibaba.dubbo.rpc.RpcContext;
 import java.util.List;
 import org.hamcrest.CoreMatchers;
-import org.junit.After;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;

apm-sniffer/apm-sdk-plugin/httpClient-4.x-plugin/src/main/java/org/skywalking/apm/plugin/httpClient/v4/HttpClientExecuteInterceptor.java

@@ -6,7 +6,7 @@ import java.net.URL;
 import org.apache.http.HttpHost;
 import org.apache.http.HttpRequest;
 import org.apache.http.HttpResponse;
-import org.skywalking.apm.agent.core.conf.Config;
+import org.skywalking.apm.agent.core.context.CarrierItem;
 import org.skywalking.apm.agent.core.context.ContextCarrier;
 import org.skywalking.apm.agent.core.context.ContextManager;
 import org.skywalking.apm.agent.core.context.tag.Tags;
@@ -42,7 +42,11 @@ public class HttpClientExecuteInterceptor implements InstanceMethodsAroundInterc
         Tags.HTTP.METHOD.set(span, httpRequest.getRequestLine().getMethod());
         SpanLayer.asHttp(span);
 
-        httpRequest.setHeader(Config.Plugin.Propagation.HEADER_NAME, contextCarrier.serialize());
+        CarrierItem items = contextCarrier.items();
+        while (items.hasNext()) {
+            CarrierItem next = items.next();
+            httpRequest.setHeader(next.getHeadKey(), next.getHeadValue());
+        }
     }
 
     @Override public Object afterMethod(EnhancedInstance objInst, Method method, Object[] allArguments,

apm-sniffer/apm-sdk-plugin/motan-plugin/src/main/java/org/skywalking/apm/plugin/motan/MotanConsumerInterceptor.java

@@ -4,7 +4,7 @@ import com.weibo.api.motan.rpc.Request;
 import com.weibo.api.motan.rpc.Response;
 import com.weibo.api.motan.rpc.URL;
 import java.lang.reflect.Method;
-import org.skywalking.apm.agent.core.conf.Config;
+import org.skywalking.apm.agent.core.context.CarrierItem;
 import org.skywalking.apm.agent.core.context.ContextCarrier;
 import org.skywalking.apm.agent.core.context.ContextManager;
 import org.skywalking.apm.agent.core.context.tag.Tags;
@@ -42,7 +42,11 @@ public class MotanConsumerInterceptor implements InstanceConstructorInterceptor,
             span.setComponent(ComponentsDefine.MOTAN);
             Tags.URL.set(span, url.getIdentity());
             SpanLayer.asRPCFramework(span);
-            request.setAttachment(Config.Plugin.Propagation.HEADER_NAME, contextCarrier.serialize());
+            CarrierItem items = contextCarrier.items();
+            while(items.hasNext()){
+                CarrierItem next = items.next();
+                request.setAttachment(next.getHeadKey(), next.getHeadValue());
+            }
         }
     }
 

apm-sniffer/apm-sdk-plugin/motan-plugin/src/main/java/org/skywalking/apm/plugin/motan/MotanProviderInterceptor.java

@@ -3,7 +3,7 @@ package org.skywalking.apm.plugin.motan;
 import com.weibo.api.motan.rpc.Request;
 import com.weibo.api.motan.rpc.Response;
 import java.lang.reflect.Method;
-import org.skywalking.apm.agent.core.conf.Config;
+import org.skywalking.apm.agent.core.context.CarrierItem;
 import org.skywalking.apm.agent.core.context.ContextCarrier;
 import org.skywalking.apm.agent.core.context.ContextManager;
 import org.skywalking.apm.agent.core.context.trace.AbstractSpan;
@@ -27,8 +27,13 @@ public class MotanProviderInterceptor implements InstanceMethodsAroundIntercepto
     @Override public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments,
         Class<?>[] argumentsTypes, MethodInterceptResult result) throws Throwable {
         Request request = (Request)allArguments[0];
-        String serializedContextData = request.getAttachments().get(Config.Plugin.Propagation.HEADER_NAME);
-        ContextCarrier contextCarrier = new ContextCarrier().deserialize(serializedContextData);
+        ContextCarrier contextCarrier = new ContextCarrier();
+        CarrierItem items = contextCarrier.items();
+        while(items.hasNext()){
+            CarrierItem next = items.next();
+            next.setHeadValue(request.getAttachments().get(next.getHeadKey()));
+        }
+
         AbstractSpan span = ContextManager.createEntrySpan(generateViewPoint(request), contextCarrier);
         SpanLayer.asRPCFramework(span);
         span.setComponent(ComponentsDefine.MOTAN);

apm-sniffer/apm-sdk-plugin/tomcat-7.x-8.x-plugin/src/main/java/org/skywalking/apm/plugin/tomcat78x/TomcatInvokeInterceptor.java

@@ -3,7 +3,7 @@ package org.skywalking.apm.plugin.tomcat78x;
 import java.lang.reflect.Method;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
-import org.skywalking.apm.agent.core.conf.Config;
+import org.skywalking.apm.agent.core.context.CarrierItem;
 import org.skywalking.apm.agent.core.context.ContextCarrier;
 import org.skywalking.apm.agent.core.context.ContextManager;
 import org.skywalking.apm.agent.core.context.tag.Tags;
@@ -16,9 +16,9 @@ import org.skywalking.apm.agent.core.plugin.interceptor.enhance.MethodInterceptR
 import org.skywalking.apm.network.trace.component.ComponentsDefine;
 
 /**
- * {@link TomcatInvokeInterceptor} fetch the serialized context data by using {@link HttpServletRequest#getHeader(String)}.
- * The {@link TraceSegment#refs} of current trace segment will reference to the trace
- * segment id of the previous level if the serialized context is not null.
+ * {@link TomcatInvokeInterceptor} fetch the serialized context data by using {@link
+ * HttpServletRequest#getHeader(String)}. The {@link TraceSegment#refs} of current trace segment will reference to the
+ * trace segment id of the previous level if the serialized context is not null.
  */
 public class TomcatInvokeInterceptor implements InstanceMethodsAroundInterceptor {
 
@@ -36,8 +36,14 @@ public class TomcatInvokeInterceptor implements InstanceMethodsAroundInterceptor
     @Override public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments,
         Class<?>[] argumentsTypes, MethodInterceptResult result) throws Throwable {
         HttpServletRequest request = (HttpServletRequest)allArguments[0];
-        String tracingHeaderValue = request.getHeader(Config.Plugin.Propagation.HEADER_NAME);
-        ContextCarrier contextCarrier = new ContextCarrier().deserialize(tracingHeaderValue);
+        ContextCarrier contextCarrier = new ContextCarrier();
+
+        CarrierItem items = contextCarrier.items();
+        while (items.hasNext()) {
+            CarrierItem next = items.next();
+            next.setHeadValue(request.getHeader(next.getHeadKey()));
+        }
+
         AbstractSpan span = ContextManager.createEntrySpan(request.getRequestURI(), contextCarrier);
         Tags.URL.set(span, request.getRequestURL().toString());
         Tags.HTTP.METHOD.set(span, request.getMethod());

apm-sniffer/apm-toolkit-activation/apm-toolkit-opentracing-activation/src/test/java/org/skywalking/apm/toolkit/activation/opentracing/SkywalkingSpanActivationTest.java

@@ -4,7 +4,6 @@ import io.opentracing.Tracer;
 import io.opentracing.tag.Tags;
 import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -18,7 +17,6 @@ import org.skywalking.apm.agent.core.context.trace.TraceSegment;
 import org.skywalking.apm.agent.core.context.trace.TraceSegmentRef;
 import org.skywalking.apm.agent.core.plugin.interceptor.enhance.EnhancedInstance;
 import org.skywalking.apm.agent.test.helper.SegmentHelper;
-import org.skywalking.apm.agent.test.helper.SegmentRefHelper;
 import org.skywalking.apm.agent.test.tools.AgentServiceRule;
 import org.skywalking.apm.agent.test.tools.SegmentStorage;
 import org.skywalking.apm.agent.test.tools.SegmentStoragePoint;
@@ -34,7 +32,6 @@ import org.skywalking.apm.toolkit.activation.opentracing.tracer.SkywalkingTracer
 import org.skywalking.apm.toolkit.opentracing.SkywalkingContinuation;
 import org.skywalking.apm.toolkit.opentracing.SkywalkingSpan;
 import org.skywalking.apm.toolkit.opentracing.SkywalkingSpanBuilder;
-import org.skywalking.apm.toolkit.opentracing.SkywalkingTracer;
 
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;