增加注释

liteflow-core/src/main/java/com/yomahub/liteflow/builder/LiteFlowChainBuilder.java

@@ -25,6 +25,9 @@ public class LiteFlowChainBuilder {
         chain = new Chain();
     }
 
+    //在parser中chain的build是2段式的，因为涉及到依赖问题，以前是递归parser
+    //2.6.8之后取消了递归的模式，两段式组装，先把带有chainName的chain对象放进去，第二段再组装chain里面的condition
+    //所以这里setChainName的时候需要判断下
     public LiteFlowChainBuilder setChainName(String chainName){
         if (FlowBus.containChain(chainName)){
             this.chain = FlowBus.getChain(chainName);