ProcessInstanceStateTransitionGuard (Zeebe Workflow Engine 1.0.0 API)

java.lang.Object
- io.camunda.zeebe.engine.processing.bpmn.ProcessInstanceStateTransitionGuard

```
public final class ProcessInstanceStateTransitionGuard
extends Object
```
Checks the preconditions of a state transition command.
A process instance can be have concurrent state transitions if a user command is received (e.g. cancel process instance) or if an internal/external event is triggered (e.g. timer boundary event). In this case, the current process instance processing needs to be interrupted be avoid an inconsistent state.

Constructor Summary

Constructors
Constructor Description

ProcessInstanceStateTransitionGuard(BpmnStateBehavior stateBehavior)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Either<Failure,?>`	`isValidStateTransition(BpmnElementContext context)`	Checks if the preconditions of the given command are met.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ProcessInstanceStateTransitionGuard
```
public ProcessInstanceStateTransitionGuard(BpmnStateBehavior stateBehavior)
```
- Method Detail
  - isValidStateTransition
```
public Either<Failure,?> isValidStateTransition(BpmnElementContext context)
```
    Checks if the preconditions of the given command are met.
    
    Returns:
    
    true if the preconditions are met and the transition command is valid.