issue状态机

Class:StateMachine+StateMachine()+state()+stateKeys()+builder()

Class:FunctionContext+updater:IssueFieldsSetter+issue:DefaultIssue+changeContext:IssueChangeContext

Interface:Function.Context+issue()+setAssignee()+setResolution()+setCloseDate()+unsetCloseDate()+unsetLine()+setType()

Class: IssueWorkflow+functionExecutor:FunctionExecutor+updater:IssueFieldsSetter+machine:StateMachine+start()+buildManualTransitions()+doManualTransition()+stateOf()

//This service is a kind of overlay of IssueWorkflowClass:TransitionService+userSession:UserSession+workflow:IssueWorkflow+listTransitions() //+doTransition() //defaultIssue:issue from db//issueChangeContext:user session//transitionKey:+checkTransitionPermission() //

Class:Builder+Builder()+states()+transition()+build()

Class:FunctionExecutor+updater:IssueFieldsSetter+execute()

Interface:Startable

Class:IssueFieldsSetter+setType()+setSeverity()+setPastSeverity()+setManualSeverity()+assign()+setNewAssignee()+unsetLine()+setResolution()......