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From "Paul King (JIRA)" <>
Subject [jira] [Commented] (GROOVY-8097) Add an argument to set the resolution cache path in @Grab
Date Sun, 05 Mar 2017 21:09:32 GMT


Paul King commented on GROOVY-8097:

I noticed no-one else replied yet. We'd eventually like to replace Ivy with something else
underneath Grapes (but we haven't developed any concrete plans as yet). So, we'd welcome a
PR that added the feature so long as it didn't leak out too much Ivy specific details. Would
a system property make sense instead of any api change? Otherwise, something similar to "disableChecksums"
(look in Grape and GrabConfig) but a String in your case would probably be the way to go.

> Add an argument to set the resolution cache path in @Grab
> ---------------------------------------------------------
>                 Key: GROOVY-8097
>                 URL:
>             Project: Groovy
>          Issue Type: New Feature
>          Components: Grape
>    Affects Versions: 2.4.8
>            Reporter: Ion Alberdi
>            Priority: Minor
> Ivy does not support concurrent access to its resolution cache 
> Grape relies on Ivy. For this reason, Grape cannot support concurrent access to its resolution
cache neither.
> When using the @Grab annotation in jenkins groovyCommand or systemGroovyCommand, the
related code is vulnerable to race conditions. When the race condition appears in a systemGroovyCommand,
we have no choice but to reboot jenkins as all consecutive calls to @Grab fail.
> Among the two solutions we tried: 
> - Protect the calls to grab with a lock similar to ivy's "artifact-lock-nio" strategy.
Works but slow.
> - Set Ivy's lock on the repository cache and setup Grab to use a different cache resolution
cache for each concurrent jobs. The following code permits to fix a test we did to reproduce
the race condition.
> {code}
>     static IvySettings createIvySettings(String resolutionPath, boolean dumpSettings)
>         // Copy/Paste/Purged from GrapeIvy.groovy
>         IvySettings settings = new IvySettings()
>         settings.load(new File(GROOVY_HOME, "grapeConfig.xml"))
>         // set up the cache dirs
>         settings.defaultCache = new File(GRAPES_HOME)
>         settings.setVariable("ivy.default.configuration.m2compatible", "true")
>         settings.setDefaultResolutionCacheBasedir(resolutionPath)
>         return settings
>     }
>     static GrapeIvy ivyWithCustomResolutionPath(String resolutionPath) {
>         Class<?> grapeIvyClass = Class.forName("groovy.grape.GrapeIvy");
>         Object instance = grapeIvyClass.newInstance()
>         Field field = grapeIvyClass.getDeclaredField("ivyInstance");
>         field.setAccessible(true);
>         field.set(instance, Ivy.newInstance(createIvySettings(resolutionPath)));
>         return ((GrapeIvy)instance)
>     }
> {code}
> We'd like to propose to add an additional argument to Grab to setup Ivy's resolution
cache directory.
> Note that this solution seems to have been adopted by these users too
> Would you agree on such a feature ? We'd be glad to propose a PR.

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