Package io.zeebe.engine.processing.bpmn

Class WorkflowInstanceStateTransitionGuard

java.lang.Object

io.zeebe.engine.processing.bpmn.WorkflowInstanceStateTransitionGuard

public final class WorkflowInstanceStateTransitionGuard
extends Object

A check to prevent concurrent state transitions of a workflow instance.

A workflow instance can be have concurrent state transitions if a user command is received (e.g. cancel workflow instance) or if an internal/external event is triggered (e.g. timer boundary event). In this case, the current workflow instance processing needs to be interrupted be avoid an inconsistent state.

Constructor Summary

Constructors

Constructor	Description
WorkflowInstanceStateTransitionGuard(BpmnStateBehavior stateBehavior)

Method Summary

Modifier and Type	Method	Description
boolean	isValidStateTransition(BpmnElementContext context)	Checks if a workflow instance event can be processed based on the current state.
void	registerStateTransition(BpmnElementContext context, WorkflowInstanceIntent newState)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WorkflowInstanceStateTransitionGuard

public WorkflowInstanceStateTransitionGuard(BpmnStateBehavior stateBehavior)

Method Detail

isValidStateTransition

public boolean isValidStateTransition(BpmnElementContext context)

Checks if a workflow instance event can be processed based on the current state.

Returns:

true if the transition is valid.

registerStateTransition

public void registerStateTransition(BpmnElementContext context,
                                    WorkflowInstanceIntent newState)