Goal

Cleanup code that was misused and make the framework start/stop-able. This idea builds on top of the start/stop, configure/destroy methods that we've been implementing during the past year and will allow us to use beans from within an 'adapter' scope, so it does not pollute the entire configuration context. Coincidentally this will also serve as a foundation for composite components.

See CRaC, an OpenJDK project that defines a new Java API to allow you to checkpoint and restore an application on the HotSpot JVM, and Spring's documentation on how we can use checkpoints in combination with our stack.
And Composite components for more information on the idea behind a 'mini-pipeline' inside a sender.

Description

tbd

Tasks

• Turn Adapter into a Spring context, remove Apache Digester #8156
• Cleanup metrics initializer #8182
• Cleanup digester factory #8181
• Remove AdapterAware interface #8185
• Fix DigesterRules parsedPatterns already parsed warning.
• Remove Digester#getCurrentElementName()
• Make MessageKeeper an event subscriber and publish events
• Replace IConfigurationAware with ConfigurationAware
• Replace IConfigurable with ConfigurableLifecycle where applicable
• IConfigurable should only have the configure method.
• Make ConfigurationWarnings an event subscriber and publish events
• Replace IScopeProvider getConfigurationClassloader with getClassLoader
• Reorganize spring files #2296

Anything else?

No response