Adjust segment service and span interface.

apm-network/src/main/java/org/skywalking/apm/network/trace/component/Component.java

+package org.skywalking.apm.network.trace.component;
+
+/**
+ * @author wusheng
+ */
+public interface Component {
+    int getId();
+
+    String getName();
+}

apm-network/src/main/java/org/skywalking/apm/network/trace/component/ComponentsDefine.java

+package org.skywalking.apm.network.trace.component;
+
+/**
+ * @author wusheng
+ */
+public class ComponentsDefine {
+    public static final OfficialComponent TOMCAT = new OfficialComponent(1, "Tomcat");
+}

apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/component/AbstractComponent.java → apm-network/src/main/java/org/skywalking/apm/network/trace/component/OfficialComponent.java

-package org.skywalking.apm.agent.core.context.component;
+package org.skywalking.apm.network.trace.component;
 
 /**
  * @author wusheng
  */
-public abstract class AbstractComponent {
+public class OfficialComponent implements Component{
     private int id;
     private String name;
 
-    protected AbstractComponent(int id, String name) {
+    public OfficialComponent(int id, String name) {
         this.id = id;
         this.name = name;
     }
 
+    @Override
     public int getId() {
         return id;
     }
+
+    @Override
+    public String getName() {
+        return name;
+    }
 }

apm-network/src/main/proto/TraceSegmentService.proto

@@ -38,14 +38,16 @@ message SpanObject {
     int64 startTime = 3;
     int64 endTime = 4;
     int32 operationNameId = 5;
-    int32 peerId = 6;
-    string peer = 7;
-    SpanType spanType = 8;
-    SpanLayer spanLayer = 9;
-    string component = 10;
-    bool isError = 11;
-    repeated KeyValue tags = 12;
-    repeated LogMessage logs = 13;
+    string operationName = 6;
+    int32 peerId = 7;
+    string peer = 8;
+    SpanType spanType = 9;
+    SpanLayer spanLayer = 10;
+    int32 componentId = 11;
+    string component = 12;
+    bool isError = 13;
+    repeated KeyValue tags = 14;
+    repeated LogMessage logs = 15;
 }
 
 enum SpanType {

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

 package org.skywalking.apm.agent.core.context.trace;
 
+import org.skywalking.apm.network.trace.component.Component;
 
 /**
  * The <code>AbstractSpan</code> represents the span's skeleton,
@@ -8,6 +9,14 @@ package org.skywalking.apm.agent.core.context.trace;
  * @author wusheng
  */
 public interface AbstractSpan {
+    /**
+     * Set the component id, which defines in {@link org.skywalking.apm.network.trace.component.ComponentsDefine}
+     * @param component
+     */
+    void setComponent(Component component);
+
+    void setComponent(String componentName);
+
     void setLayer(SpanLayer layer);
 
     /**

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

@@ -2,10 +2,10 @@ package org.skywalking.apm.agent.core.context.trace;
 
 import java.util.LinkedList;
 import java.util.List;
-import org.skywalking.apm.agent.core.context.component.AbstractComponent;
 import org.skywalking.apm.agent.core.context.util.KeyValuePair;
 import org.skywalking.apm.agent.core.context.util.ThrowableTransformer;
 import org.skywalking.apm.agent.core.dictionary.DictionaryUtil;
+import org.skywalking.apm.network.trace.component.Component;
 
 /**
  * The <code>AbstractTracingSpan</code> represents a group of {@link AbstractSpan} implementations,
@@ -35,6 +35,8 @@ public abstract class AbstractTracingSpan implements AbstractSpan {
 
     protected int componentId = 0;
 
+    protected String componentName;
+
     /**
      * Log is a concept from OpenTracing spec.
      * <p>
@@ -123,7 +125,13 @@ public abstract class AbstractTracingSpan implements AbstractSpan {
         this.layer = layer;
     }
 
-    public void setComponent(AbstractComponent component){
+    @Override
+    public void setComponent(Component component) {
         this.componentId = component.getId();
     }
+
+    @Override
+    public void setComponent(String componentName) {
+        this.componentName = componentName;
+    }
 }