E4/Eclipse Application Services

• Receiving input.
• Producing selection.
• Persisting data (receiving persisted state, and producing persistable state).
• Accessing preferences (mostly read access, but sometimes write access).
• Managing shared resources (e.g. JFace LocalResourceManager).
• Status handling (errors and warnings).
• Connecting to the help system.
• Participating in Undo/Redo.
• Adapting objects.
• Participating in label and icon decoration.
• Reacting to changes to the context (such as plug-ins that come and go).
• Scheduling background work.
• Contributing to the workbench model (e.g. tool items, menus).
• Registering command handlers.
• Reacting to changes to the workbench model.
• Reporting progress and responding to cancellation requests.
• Reporting status (think status line).
• Logging.