1.优化CostTime代码结构。

skywalking-analysis/src/main/java/com/ai/cloud/skywalking/analysis/filter/impl/ProcessCostTimeFilter.java

@@ -8,18 +8,22 @@ import com.ai.cloud.skywalking.analysis.model.SpanEntry;
 public class ProcessCostTimeFilter extends SpanNodeProcessFilter {
 	@Override
 	public void doFilter(SpanEntry spanEntry, ChainNode node, CostMap costMap) {
-        long subNodeCost = spanEntry.getCost();
 		node.setCost(spanEntry.getCost());
 		
+		this.saveCostAsSubNodeCost(spanEntry, node, costMap);
+		this.computeChainNodeCost(costMap, node);
+
+		this.doNext(spanEntry, node, costMap);
+	}
+
+	private void saveCostAsSubNodeCost(SpanEntry spanEntry, ChainNode node,
+			CostMap costMap) {
+		long subNodeCost = spanEntry.getCost();
 		if (costMap.exists(spanEntry.getParentLevelId())) {
 			subNodeCost += costMap.get(spanEntry.getParentLevelId());
 		}
 
 		costMap.put(spanEntry.getParentLevelId(), subNodeCost);
-        
-        this.computeChainNodeCost(costMap, node);
-
-        this.doNext(spanEntry, node, costMap);
 	}
 
 	private void computeChainNodeCost(CostMap costMap, ChainNode node) {