[GROOVY-1721] Discovery mechanism for customizing metaclasses with a script using ExpandoMetaClass

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Component/s: groovy-runtime
• Assignee: Jochen Theodorou
• Reporter: Guillaume Sauthier
• Created: 13/Feb/07 10:58
• Updated: 02/May/17 02:03
• Resolved: 08/Nov/16 18:24

Description

Currently, it is possible to define custom MetaClasses at load time by following the convention:

groovy.runtime.metaclass.java.lang.StringMetaClass

Creating this StringMetaClass in this specific place will use this metaclass in lieu of the default metaclass.

By adding ExpandoMetaClass back in Groovy, we should provide a mechanism for customizing metaclasses.
For instance, we could create an expandoMetaClassScript.groovy in the package groovy.runtim.metaclass.
And in this script, we would use ExpandoMetaClasses to customize classes behaviour further.

Issue Links

• relates to: GROOVY-3944 Add a META-INF/services mechanism (similar to global ast transformations) that allows custom ExpandoMetaClass code to be run when a class is loaded