我有看起来像那样的 GraphTraversals(attrGroup:
GraphTraversal<Vertex,Edge> attrGroupTraversal = some code generates it;
List<Vertex> attributeVs = attrGroupTraversal.inV().out(EdgeLabels.ContainsAttribute).toList();
List<Vertex> sourceVs = attrGroupTraversal.inV().out(EdgeLabels.ContainsSource).toList();
List<Vertex> targetVs = attrGroupTraversal.out(EdgeLabels.ContainsTarget).toList();
有没有办法重用 attrGroupTraversal,这样我就不需要重新运行最初创建它的代码?
我得到:
java.lang.IllegalStateException: The traversal strategies are complete and the traversal can no longer be modulated
at org.apache.tinkerpop.gremlin.process.traversal.Traversal$Exceptions.traversalIsLocked(Traversal.java:245) at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.addStep(DefaultTraversal.java:274) at org.apache.tinkerpop.gremlin.process.traversal.Traversal$Admin.addStep(Traversal.java:301) at org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal$Admin.addStep(GraphTraversal.java:170) at org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal.inV(GraphTraversal.java:384)
最佳答案
我建议你 .clone()
你原来的遍历。
以下应该有效:
GraphTraversal<Vertex,Edge> attrGroupTraversal = some code generates it;
List<Vertex> attributeVs = attrGroupTraversal.clone().inV().out(EdgeLabels.ContainsAttribute).toList();
List<Vertex> sourceVs = attrGroupTraversal.clone().inV().out(EdgeLabels.ContainsSource).toList();
List<Vertex> targetVs = attrGroupTraversal.clone().out(EdgeLabels.ContainsTarget).toList();
另请参阅:Traversal component reuse来自 TinkerPop 文档食谱。
关于java - 分配给变量时,我可以以某种方式重用 Gremlin GraphTraversals 代码吗?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41528217/