# Class ExpressionsUtils

OptimaJet.Workflow.Core.CodeActions.ExpressionsUtils

Resolves the compiled expression invokers and on-demand expression cache used by a process scheme.

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

```csharp
public static class ExpressionsUtils
```

## Methods

`public static Task<ExpressionsInvoker> GetExpressionInvokerAsync(WorkflowRuntime runtime, ProcessDefinition processDefinition)` 

Gets the [ExpressionsInvoker](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/ExpressionsInvoker/) that evaluates the compiled [ConditionType.Expression](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ConditionType/) conditions for transitions in the specified process scheme.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `runtime` | `WorkflowRuntime` | The runtime whose [WorkflowRuntime.Builder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/WorkflowRuntime/) loads the root process scheme when `processDefinition` is a subprocess scheme. |
| `processDefinition` | `ProcessDefinition` | The current process scheme for which to resolve the invoker. |

### Returns

| Type | Description |
| --- | --- |
| `Task<ExpressionsInvoker>` | [ProcessDefinition.ExpressionsInvoker](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ProcessDefinition/) from `processDefinition`, or from its root process scheme when it is a subprocess scheme. |

`public static Task<SubprocessNameGetterInvoker> GeSubprocessNameGetterInvokerAsync(WorkflowRuntime runtime, ProcessDefinition processDefinition)` 

Gets the [SubprocessNameGetterInvoker](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/SubprocessNameGetterInvoker/) that evaluates compiled [TransitionDefinition.SubprocessName](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/TransitionDefinition/) values for transitions in the specified process scheme.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `runtime` | `WorkflowRuntime` | The runtime whose [WorkflowRuntime.Builder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/WorkflowRuntime/) loads the root process scheme when `processDefinition` is a subprocess scheme. |
| `processDefinition` | `ProcessDefinition` | The current process scheme for which to resolve the invoker. |

### Returns

| Type | Description |
| --- | --- |
| `Task<SubprocessNameGetterInvoker>` | [ProcessDefinition.SubprocessNameGetterInvoker](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ProcessDefinition/) from `processDefinition`, or from its root process scheme when it is a subprocess scheme. |

`public static Task<ExpressionManager> GetExpressionManagerAsync(WorkflowRuntime runtime, ProcessDefinition processDefinition)` 

Gets the [ExpressionManager](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/ExpressionManager/) that compiles, caches, and evaluates expressions requested while a process is running.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `runtime` | `WorkflowRuntime` | The runtime whose [WorkflowRuntime.Builder](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime/WorkflowRuntime/) loads the root process scheme when `processDefinition` is a subprocess scheme. |
| `processDefinition` | `ProcessDefinition` | The current process scheme for which to resolve the manager. |

### Returns

| Type | Description |
| --- | --- |
| `Task<ExpressionManager>` | [ProcessDefinition.ExpressionManager](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ProcessDefinition/) from `processDefinition`, or from its root process scheme when it is a subprocess scheme. |

## Remarks

These expression-related services are created for non-subprocess schemes. When [ProcessDefinition.IsSubprocessScheme](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ProcessDefinition/) is [true](https://learn.microsoft.com/dotnet/csharp/language-reference/builtin-types/bool), these methods load the root process scheme identified by [ProcessDefinition.RootSchemeId](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Model/ProcessDefinition/) and return its services.

[Previous ExpressionsInvoker](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/ExpressionsInvoker/) [Next FunctionInvoker<TReturn>](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.CodeActions/FunctionInvoker-TReturn/)