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https://issues.apache.org/jira/browse/GROOVY-8097?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898195#comment-15898195
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Jex Jexler commented on GROOVY-8097:
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I'm not an expert on Ivy, but instead of adding a new system property, couldn't
one create a dedicated grapeConfig.xml that defines a separate
resolutionCacheDir and repositoryCacheDir and point to that grapeConfig.xml via
the "grape.config" system property?
http://ant.apache.org/ivy/history/latest-milestone/settings/caches.html
If I get this correctly, this proposal is about an issue relatively "low down"
in Ivy, between processes / Java VMs, as opposed to issues within a VM, see
GROOVY-7407? At least a quick test with GroovyCompileConcurrencyTest.java
there, plus calling ivyWithCustomResolutionPath(path) at the start did not make
any difference there.
> Add an argument to set the resolution cache path in @Grab
> ---------------------------------------------------------
>
> Key: GROOVY-8097
> URL: https://issues.apache.org/jira/browse/GROOVY-8097
> 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
> https://issues.apache.org/jira/browse/IVY-654
> 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
> https://rbcommons.com/s/twitter/r/3436/
> Would you agree on such a feature ? We'd be glad to propose a PR.
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