# Class RestorerBase

OptimaJet.Workflow.Core.Runtime.ServiceRunners.RestorerBase

Provides shared logic for creating asynchronous restore operations for workflow process instances.

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

```csharp
public abstract class RestorerBase
```

## Type Hierarchy

-   RestorerBase Current type
    -   [MultiServerRestorer](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime.ServiceRunners/MultiServerRestorer/)
    -   [SingleServerRestorer](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime.ServiceRunners/SingleServerRestorer/)

## Constructors

`protected RestorerBase(WorkflowRuntime runtimeOwner, bool isMultiServer, CancellationToken token)` 

Initializes a new instance of the [RestorerBase](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime.ServiceRunners/RestorerBase/) class.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `runtimeOwner` | `WorkflowRuntime` | The runtime that owns the restore process. |
| `isMultiServer` | `Boolean` | Indicates whether multi-server lock validation should be performed. |
| `token` | `CancellationToken` | A token that can cancel restore execution before it starts. |

## Methods

`protected Func<Task> GetRestorerAsyncAction(Guid processId, string runtimeId = null, bool isSelfRestore = false, Guid runtimeLock = default)` 

Creates an asynchronous function that restores a workflow process based on its current status.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `processId` | `Guid` | Identifier of the process instance to restore. |
| `runtimeId` | `String` | Runtime identifier used when checking lock ownership in multi-server mode. |
| `isSelfRestore` | `Boolean` | True when restore is initiated by the same runtime that owns the process lock. |
| `runtimeLock` | `Guid` | Expected lock identifier to compare with the current runtime lock. |

### Returns

| Type | Description |
| --- | --- |
| `Func<Task>` | An awaitable delegate that executes the restore routine. |

### Exceptions

| Type | Description |
| --- | --- |
| `SelfRestoreConcurrencyException` | Thrown when the runtime lock changes during a self restore attempt. |
| `OperationCanceledException` | Thrown when the provided cancellation token is canceled. |

### Remarks

The delegate runs through custom [IProcessRestorer](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime.ProcessRestoring/IProcessRestorer/) decisions when available, or performs default status and timer restoration when no custom decision applies.

## Remarks

Implementations of this class execute a restore action through [RestorerBase.GetRestorerAsyncAction(Guid, string, bool, Guid)](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime.ServiceRunners/RestorerBase/) and can host custom and default recovery behavior.

[Previous MultiServerServiceRunner](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime.ServiceRunners/MultiServerServiceRunner/) [Next SingleServerRestorer](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Runtime.ServiceRunners/SingleServerRestorer/)