Add equals methods for DistributedTraceId and TraceSegmentRef. Avoid...

Add equals methods for DistributedTraceId and TraceSegmentRef. Avoid duplication in TraceSegment, based on LinkedList.contains().

skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceId/DistributedTraceId.java

@@ -23,4 +23,21 @@ public abstract class DistributedTraceId {
     public String get() {
         return id;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+
+        DistributedTraceId id1 = (DistributedTraceId)o;
+
+        return id != null ? id.equals(id1.id) : id1.id == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return id != null ? id.hashCode() : 0;
+    }
 }

skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/TraceSegmentRef.java

@@ -104,21 +104,15 @@ public class TraceSegmentRef{
 
         TraceSegmentRef ref = (TraceSegmentRef)o;
 
-        if (spanId != ref.spanId)
-            return false;
         if (traceSegmentId != null ? !traceSegmentId.equals(ref.traceSegmentId) : ref.traceSegmentId != null)
             return false;
-        if (applicationCode != null ? !applicationCode.equals(ref.applicationCode) : ref.applicationCode != null)
-            return false;
-        return peerHost != null ? peerHost.equals(ref.peerHost) : ref.peerHost == null;
+        return applicationCode != null ? applicationCode.equals(ref.applicationCode) : ref.applicationCode == null;
     }
 
     @Override
     public int hashCode() {
         int result = traceSegmentId != null ? traceSegmentId.hashCode() : 0;
-        result = 31 * result + spanId;
         result = 31 * result + (applicationCode != null ? applicationCode.hashCode() : 0);
-        result = 31 * result + (peerHost != null ? peerHost.hashCode() : 0);
         return result;
     }
 }