Package basicexecuter provides interfaces as document execution logic.

Package iohandler implements the iohandler for the plugins.

Package executer provides interfaces as document execution logic.

Package plugin contains general interfaces and types relevant to plugins.

DocumentFileStore dependent on the current file functions in docmanager to provide file save/load operations TODO need to refactor global lock in docmanager, or discard the entire package and impl the file IO here.

DocumentStore is an wrapper over the document state class that provides additional persisting functions for the Executer.

Executer accepts an DocumentStore object, save when necessary for crash-recovery, and return when finshes the run, while the caller will pick up the result from the same docStore object.