# Class SubprocessNameGetterInvoker

OptimaJet.Workflow.Core.CodeActions.SubprocessNameGetterInvoker

Evaluates configured [TransitionDefinition.SubprocessName](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/TransitionDefinition/) values for process transitions.

Namespace: [OptimaJet.Workflow.Core.CodeActions](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/)

```csharp
public sealed class SubprocessNameGetterInvoker : FunctionInvoker<string>
```

## Type Hierarchy

-   [FunctionInvoker<string>](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/FunctionInvoker-TReturn/)
    -   SubprocessNameGetterInvoker Current type

## Properties

`protected override FunctionInvoker<string>.InvokerNotFoundReactionType InvokerNotFoundReaction { get; }` 

Gets the behavior applied by the [FunctionInvoker<TReturn>.InvokeAsync(TransitionDefinition, ProcessInstance)](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/FunctionInvoker-TReturn/) methods when no function is registered for the requested transition.

`public override string FunctionName { get; }` 

Gets the label included in compilation-error and missing-function messages.

`public static string FunctionNameStatic { get; }` 

Gets the diagnostic label for subprocess-name functions.

## Methods

`public Task<string> GetSubprocessNameAsync(TransitionDefinition transition, ProcessInstance processInstance)` 

Gets a subprocess name for the specified `transition` and `processInstance`.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `transition` | `TransitionDefinition` | The transition whose TransitionDefinition.Name identifies the registered subprocess-name function. |
| `processInstance` | `ProcessInstance` | The process instance supplied to the registered function. |

### Returns

| Type | Description |
| --- | --- |
| `Task<String>` | The evaluated subprocess name, or TransitionDefinition.Name when no function is registered or the function returns [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null). |

### Remarks

An empty string returned by a registered function is returned unchanged.

`public string GetSubprocessName(TransitionDefinition transition, ProcessInstance processInstance)` 

Synchronously gets the subprocess name for the specified transition and process instance.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `transition` | `TransitionDefinition` | The transition whose subprocess name is requested. |
| `processInstance` | `ProcessInstance` | The process instance supplied to the registered function. |

### Returns

| Type | Description |
| --- | --- |
| `String` | The same subprocess name produced by [SubprocessNameGetterInvoker.GetSubprocessNameAsync(TransitionDefinition, ProcessInstance)](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/SubprocessNameGetterInvoker/). |

### Exceptions

| Type | Description |
| --- | --- |
| `AggregateException` | Thrown when asynchronous subprocess-name evaluation fails. |

## Remarks

The inherited InvokeAsync(string, ProcessInstance) method returns [null](https://learn.microsoft.com/dotnet/csharp/language-reference/keywords/null) when a transition has no registered function. [SubprocessNameGetterInvoker.GetSubprocessNameAsync(TransitionDefinition, ProcessInstance)](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/SubprocessNameGetterInvoker/) and [SubprocessNameGetterInvoker.GetSubprocessName(TransitionDefinition, ProcessInstance)](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/SubprocessNameGetterInvoker/) replace that result with the transition name.

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