contribute

abstract fun <E : Extension> contribute(    extensionPoint: ExtensionPoint<E>,     plugin: Plugin,     extensionInstance: E)

注册一个扩展


abstract fun <E : Extension> contribute(    extensionPoint: ExtensionPoint<E>,     plugin: Plugin,     lazyInstance: () -> E)

注册一个扩展. lazyInstance 将会在 getExtensions 时才会计算.