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implemented optional dependencies

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Plugin authors could now define optional dependencies to other plugins in their pom.
Extensions which are using classes from optional dependencies must specify this
with the "requires" attribute of the extension annotation.
Extensions with "requires" attribute are not installed if one of the specified plugins,
is not installed.
This commit is contained in:
Sebastian Sdorra
2020-01-08 14:27:11 +01:00
parent 3244e552a9
commit c1aa4af6e0
14 changed files with 262 additions and 86 deletions
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13
scm-annotations/src/main/java/sonia/scm/plugin/Extension.java
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@@ -49,4 +49,15 @@ import java.lang.annotation.Target;
@Target({ ElementType.TYPE })
@PluginAnnotation("extension")
@Retention(RetentionPolicy.RUNTIME)
public @interface Extension {}
public @interface Extension {
/**
* List of required plugins to load this extension.
* The requires attribute can be used to implement optional extensions.
* A plugin author is able to implement an extension point of an optional plugin and the extension is only loaded if
* all of the specified plugins are installed.
*
* @since 2.0.0
* @return list of required plugins to load this extension
*/
String[] requires() default {};
}