# Class BaseNotifier

OptimaJet.Workflow.RealTimeTrackingPlugin.Notifiers.BaseNotifier

Represents a base class for system notifications.

Namespace: [OptimaJet.Workflow.RealTimeTrackingPlugin.Notifiers](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin.Notifiers/)

```csharp
public abstract class BaseNotifier
```

## Type Hierarchy

-   BaseNotifier Current type
    -   [MultiServerNotifier](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin.Notifiers/MultiServerNotifier/)
    -   [SingleServerNotifier](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin.Notifiers/SingleServerNotifier/)

## Constructors

`protected BaseNotifier(WorkflowRuntime runtime, RealTimeTrackingPluginSettings settings, Func<bool> getDisabledFn)` 

Initializes a new instance of the [BaseNotifier](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin.Notifiers/BaseNotifier/) class.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `runtime` | `WorkflowRuntime` | WorkflowRuntime. |
| `settings` | `RealTimeTrackingPluginSettings` | [RealTimeTrackingPluginSettings](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin/RealTimeTrackingPluginSettings/). |
| `getDisabledFn` | `Func<Boolean>` | A function that returns a boolean indicating whether the plugin is disabled. |

## Methods

`public void SetHubContext(IHubContext<WorkflowEngineHub> hubContext)` 

Sets the context for the SignalR hub used by the WorkflowEngineHub.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `hubContext` | `IHubContext<WorkflowEngineHub>` | An instance of SignalR.IHubContext?text=IHubContext<WorkflowEngineHub>. |

`public abstract Task OnConnectedAsync(string processId, string connectionId)` 

Method to handle client connection to a process for tracking purposes.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `processId` | `String` | ProcessId of the ProcessInstance. |
| `connectionId` | `String` | The unique identifier of the client's connection. |

### Returns

| Type | Description |
| --- | --- |
| `Task` | A [Task](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task) representing the asynchronous operation. |

`public abstract Task OnDisconnectedAsync(string connectionId)` 

Handles the disconnection of a connection.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `connectionId` | `String` | The unique identifier for the connection. |

### Returns

| Type | Description |
| --- | --- |
| `Task` | A [Task](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task) representing the asynchronous operation. |

`public Task StartAsync()` 

Starts the plugin.

### Returns

| Type | Description |
| --- | --- |
| `Task` |  |

`public abstract Task StopAsync()` 

Stops the plugin.

### Returns

| Type | Description |
| --- | --- |
| `Task` | A [Task](https://learn.microsoft.com/dotnet/api/system.threading.tasks.task) representing the asynchronous operation. |

`protected Task EnterLockAsync()` 

Enters lock.

### Returns

| Type | Description |
| --- | --- |
| `Task` |  |

`protected void ExitLock()` 

Exits lock.

`protected Task SendProcessChangedAsync(ProcessInstance processInstance)` 

Sends a notification when a process changes.

### Parameters

| Name | Type | Description |
| --- | --- | --- |
| `processInstance` | `ProcessInstance` | The instance of the ProcessInstance. |

### Returns

| Type | Description |
| --- | --- |
| `Task` |  |

## Fields

`protected readonly WorkflowRuntime _runtime` 

An instance of the WorkflowRuntime.

`protected readonly ConcurrentDictionary<string, List<string>> _groups` 

A concurrent dictionary mapping process ids to lists of connected clients. Used to track active processed and the clients associated with them.

`protected bool _isStarted` 

Indicates whether the plugin has started.

`protected readonly RealTimeTrackingPluginSettings _settings` 

An instance of the [RealTimeTrackingPluginSettings](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin/RealTimeTrackingPluginSettings/).

`protected readonly Func<bool> _getDisabledFn` 

A function that returns a boolean indicating whether the plugin is disabled.

[Previous WorkflowEngineHub](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin.Hubs/WorkflowEngineHub/) [Next MultiServerNotifier](https://api.workflowengine.io/realtime-tracking-plugin/OptimaJet.Workflow.RealTimeTrackingPlugin.Notifiers/MultiServerNotifier/)