TinkerPop3 > Gremlin >检查是否安装了图形库

Question

在Gremlin中，我像下面这样安装了NEO4J库

bin/gremlin-server.sh -i org.apache.tinkerpop neo4j-gremlin x.y.z

有什么方法可以找出这个库是否已经安装了？

说来话长：

我正在模拟存在一些网络问题的条件，所以在运行这个问题之前，我禁用了网络连接。

剧本：

#!/bin/bash
echo "PING PING PING PING PING"
bin/gremlin-server.sh -i org.apache.tinkerpop neo4j-gremlin x.y.z

if [ $? -eq 0 ]
then
  echo "Successfully Successfully Successfully Successfully"
else
  echo "FAILED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
fi

当网络关闭时的结果

PING PING PING PING PING
Redirecting to 'install org.apache.tinkerpop neo4j-gremlin 3.3.1' (-i will be removed in a future release)
Installing dependency org.apache.tinkerpop neo4j-gremlin 3.3.1
Could not install the dependency: Error grabbing Grapes -- [unresolved dependency: org.apache.tinkerpop#neo4j-gremlin;3.3.1: not found]
java.lang.RuntimeException: Error grabbing Grapes -- [unresolved dependency: org.apache.tinkerpop#neo4j-gremlin;3.3.1: not found]
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
    at groovy.grape.GrapeIvy.getDependencies(GrapeIvy.groovy:424)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
    at groovy.grape.GrapeIvy.resolve(GrapeIvy.groovy:571)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
    at groovy.grape.GrapeIvy.resolve(GrapeIvy.groovy:534)
    at groovy.grape.Grape.resolve(Grape.java:202)
    at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
    at org.apache.tinkerpop.gremlin.groovy.util.DependencyGrabber.copyDependenciesToPath(DependencyGrabber.groovy:110)
    at org.apache.tinkerpop.gremlin.server.util.GremlinServerInstall.main(GremlinServerInstall.java:38)
Successfully Successfully Successfully Successfully

为了检查bash退出代码是否运行良好，我执行了以下操作

cd wrongfolder
if [ $? -eq 0 ]
then
  echo "Successfully Successfully Successfully Successfully"
else
  echo "FAILED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
fi

输出

PING PING PING PING PING
/install.sh: line 5: cd: wrongfolder: No such file or directory
FAILED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

所以出口码工作得很好，但对Gremlin来说却不起作用

Answer 1

我只是看了一下密码。加载插件的实用程序似乎并没有产生错误代码，而是只打印错误并正常退出。所以，你所看到的都是意料之中的。

我添加了一个修复程序，用于3.2.10、3.3.4和3.4.0：

https://github.com/apache/tinkerpop/commit/2d315e828149a132ecabf406af91acc3caec064c

我不认为除了解析当前产生的输出之外，没有其他方法来决定成功或失败。