| Interface | Description | 
|---|---|
| ActivityInstanceState | Contains a predefined set of states activity instances may be in
 during the execution of a process instance. | 
| AtomicOperation | Deprecated | 
| Callback<P,R> | Represents a callback which should be called after work was done. | 
| Class | Description | 
|---|---|
| ActivityInstanceState.ActivityInstanceStateImpl | |
| CompensationBehavior | Contains the oddities required by compensation due to the execution structures it creates. | 
| ExecutionImpl | |
| ExecutionStartContext | |
| InstantiationStack | Expresses that the list of activities should be instantiated and optionally a transition
 afterwards. | 
| LegacyBehavior | This class encapsulates legacy runtime behavior for the process engine. | 
| OutgoingExecution | |
| ProcessInstanceStartContext | Callback for being notified when a model instance has started. | 
| PvmExecutionImpl | 
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