C# (.NET)

The KubeMQ SDK for C# enables C# developers to seamlessly communicate with the KubeMQ server, implementing various communication patterns such as Events, EventStore, Commands, Queries, and Queues.

Sources

SDK

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Examples

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Prerequisites

• .Net Core 5.0 or later

• .Net Framework 4.6.1 or later

• .Net Standard 2.0 or later

• KubeMQ server running locally or accessible over the network

Installation

The KubeMQ SDK for C# is available as a NuGet package. You can install it using the following command:

dotnet add package KubeMQ.SDK.csharp

Running Examples

The examples are standalone projects that showcase the usage of the SDK. To run the examples, ensure you have a running instance of KubeMQ.

SDK Overview

The SDK implements all communication patterns available through the KubeMQ server:

• PubSub

  • Events

  • EventStore

• Commands & Queries (CQ)

  • Commands

  • Queries

• Queues

KubeMQ Client Configuration

All KubeMQ clients (PubSubClient, QueuesClient, and CQClient) share the same configuration parameters. To create any client instance, you need to use the respective builder with at least two mandatory parameters: address (KubeMQ server address) and clientId.

Configuration Parameters

The table below describes all available configuration parameters:

Name	Type	Description	Default Value	Mandatory
Address	string	The address of the KubeMQ server.	None	Yes
ClientId	string	The client ID used for authentication.	None	Yes
AuthToken	string	The authorization token for secure communication.	None	No
Tls	TlsConfig	Enable or disable TLS for secure communication.	false	No
MaxSendSize	int	The maximum size of the messages to send (in bytes).	104857600 (100MB)	No
MaxReceiveSize	int	The maximum size of the messages to receive (in bytes).	104857600 (100MB)	No
ReconnectIntervalSeconds	int	The interval in seconds between reconnection attempts.	5	No

TLS Configuration

Name	Type	Description	Default Value	Mandatory
Enabled	bool	Enable or disable TLS for secure communication.	false	No
CertFile	string	The path to the TLS certificate file.	None	No (Yes if tls is true)
KeyFile	string	The path to the TLS key file.	None	No (Yes if tls is true)
CaFile	string	The path to the TLS CA file.	None	No (Yes if tls is true)

Example Usage

Here's an example of how to create a client instance (using PubSubClient as an example):

static async Task<CommandsClient> CreateCommandsClient()
        {
            Configuration cfg = new Configuration().
                SetAddress("localhost:50000").
                SetClientId("Some-client-id").
                SetAuthToken("some-auth-token").
                SetMaxReceiveSize(1024).
                SetMaxSendSize(1024).
                SetReconnectIntervalSeconds(10).
                SetTls( new TlsConfig().
                    SetEnabled(true).
                    SetCertFile("path to cert file").
                    SetKeyFile("path to key file").
                    SetCaFile("path to ca file"));
            CommandsClient client = new CommandsClient();
            Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
            if (!connectResult.IsSuccess)
            {
                Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
                throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
            }
            return client;
        }

Result Object

In many cases, the SDK methods return a Result object. The Result object is a simple class that contains two attributes: IsSuccess and ErrorMessage. It is used to indicate the success or failure of an operation and to provide an error message in case of failure.

PubSub Events Operations

Create Channel

Create a new Events channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to create	None	Yes

Response

Return Result object

Example

static async Task<EventsClient> CreateEventsClient()
    {
        Configuration cfg = new Configuration().
            SetAddress("localhost:50000").
            SetClientId("Some-client-id");
        EventsClient client = new EventsClient();
        Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
        if (!connectResult.IsSuccess)
        {
            Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
            throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        }
        return client;
    }
static async Task CreateEventsChannel()
{
    EventsClient client =await CreateEventsClient();
    Result result = await client.Create("events_1");
    if (!result.IsSuccess)
    {
        Console.WriteLine($"Could not create events channel, error:{result.ErrorMessage}");
        return;
    }
    Console.WriteLine("Eventss Channel Created");
    await client.Close();
}

Delete Channel

Delete an existing Events channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to delete	None	Yes

Response

Return Result object

Example

static async Task<EventsClient> CreateEventsClient()
    {
        Configuration cfg = new Configuration().
            SetAddress("localhost:50000").
            SetClientId("Some-client-id");
        EventsClient client = new EventsClient();
        Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
        if (!connectResult.IsSuccess)
        {
            Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
            throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        }
        return client;
    }
static async Task DeleteEventsChannel()
    {
        EventsClient client =await CreateEventsClient();
        Result result = await client.Delete("events_1");
        if (!result.IsSuccess)
        {
            Console.WriteLine($"Could not delete events channel, error:{result.ErrorMessage}");
            return;
        }
        Console.WriteLine("Eventss Channel Deleted");
        await client.Close();
    }

List Channels

Retrieve a list of Events channels.

Request Parameters

Name	Type	Description	Default Value	Mandatory
searchQuery	string	Search query to filter channels (optional)	None	No

Response

Returns a ListPubSubAsyncResult where each PubSubChannel has the following attributes:

Name	Type	Description
Name	string	The name of the Pub/Sub channel.
Type	string	The type of the Pub/Sub channel.
LastActivity	long	The timestamp of the last activity on the channel, represented in milliseconds since epoch.
IsActive	boolean	Indicates whether the channel is active or not.
Incoming	PubSubChannel	The statistics related to incoming messages for this channel.
Outgoing	PubSubChannel	The statistics related to outgoing messages for this channel.

Example

static async Task<EventsClient> CreateEventsClient()
    {
        Configuration cfg = new Configuration().
            SetAddress("localhost:50000").
            SetClientId("Some-client-id");
        EventsClient client = new EventsClient();
        Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
        if (!connectResult.IsSuccess)
        {
            Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
            throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        }
        return client;
    }
static async Task ListEventsChannels()
    {
        EventsClient client =await CreateEventsClient();
        ListPubSubAsyncResult listResult = await client.List();
        if (!listResult.IsSuccess)
        {
            Console.WriteLine($"Could not list events channels, error:{listResult.ErrorMessage}");
            return;
        }
        
        foreach (var channel in listResult.Channels)
        {
            Console.WriteLine($"{channel}");
        }
        await client.Close();
    }

Send & Subscribe Event

Send and subscribe to event messages.

Send Request: Event

Name	Type	Description	Default Value	Mandatory
Id	String	Unique identifier for the event message.	None	No
Channel	String	The channel to which the event message is sent.	None	Yes
Metadata	String	Metadata associated with the event message.	None	No
Body	byte[]	Body of the event message in bytes.	Empty byte array	No
Tags	Map<String, String>	Tags associated with the event message as key-value pairs.	Empty Map	No

Response

Return Result object

Subscribe Request: EventsSubscription

Name	Type	Description	Default Value	Mandatory
Channel	String	The channel to subscribe to.	None	Yes
Group	String	The group to subscribe with.	None	No
ReceiveEventHandler	delegate(EventMessageReceived)	Callback function to be called when an event message is received.	None	Yes
ErrorHandler	delegate(Exception)	Callback function to be called when an error occurs.	None	No

Callback: EventMessageReceived Class Detail

Name	Type	Description
Id	string	The unique identifier of the message.
FromClientId	string	The ID of the client that sent the message.
Timestamp	long	The timestamp when the message was received, in seconds
Channel	string	The channel to which the message belongs.
Metadata	string	The metadata associated with the message.
Body	byte[]	The body of the message.
Tags	Map<string, string>	The tags associated with the message.

Example

static async Task<EventsClient> CreateEventsClient()
    {
        Configuration cfg = new Configuration().
            SetAddress("localhost:50000").
            SetClientId("Some-client-id");
        EventsClient client = new EventsClient();
        Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
        if (!connectResult.IsSuccess)
        {
            Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
            throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        }
        return client;
    }
static async Task SendSubscribe()
    {
        EventsClient client =await CreateEventsClient();
        var subscription = new EventsSubscription()
            .SetChannel("e1")
            .SetGroup("")
            .SetOnReceiveEvent(receivedEvent =>
            {
                Console.WriteLine($"Event Received: Id:{receivedEvent.Id}, Body:{Encoding.UTF8.GetString(receivedEvent.Body)}");
            })
            .SetOnError(exception =>
            {
                Console.WriteLine($"Error: {exception.Message}");
            });
        Result subscribeResult =  client.Subscribe(subscription);
        if (!subscribeResult.IsSuccess)
        {
            Console.WriteLine($"Could not subscribe to KubeMQ Server, error:{subscribeResult.ErrorMessage}");
            return;
        }
        Thread.Sleep(1000);
        Event msg = new Event().SetChannel("e1").SetBody("hello kubemq - sending an event message"u8.ToArray());
        Result sendResult=  await client.Send(msg);
        if (!sendResult.IsSuccess)
        {
            Console.WriteLine($"Could not send an event to KubeMQ Server, error:{sendResult.ErrorMessage}");
            return;
        }
        await  client.Close ();
    }

PubSub EventsStore Operations

Create Channel

Create a new EventsStore channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to create	None	Yes

Response

Return Result object

Example

static async Task<EventsStoreClient> CreateEventsStoresClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      EventsStoreClient client = new EventsStoreClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task CreateEventsStoresChannel()
  {
      EventsStoreClient client =await CreateEventsStoresClient();
      Result result = await client.Create("events_store_1");
      if (!result.IsSuccess)
      {
          Console.WriteLine($"Could not create events-store channel, error:{result.ErrorMessage}");
          return;
      }
      Console.WriteLine("EventsStores Channel Created");
      await client.Close();
  }

Delete Channel

Delete an existing EventsStore channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to delete	None	Yes

Response

Return Result object

Example

static async Task<EventsStoreClient> CreateEventsStoresClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      EventsStoreClient client = new EventsStoreClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task DeleteEventsStoresChannel()
    {
        EventsStoreClient client =await CreateEventsStoresClient();
        Result result = await client.Delete("events_store_1");
        if (!result.IsSuccess)
        {
            Console.WriteLine($"Could not delete events-store channel, error:{result.ErrorMessage}");
            return;
        }
        Console.WriteLine("EventsStores Channel Deleted");
        await client.Close();
    }

List Channels

Retrieve a list of EventsStore channels.

Request Parameters

Name	Type	Description	Default Value	Mandatory
searchQuery	string	Search query to filter channels (optional)	None	No

Response

Returns a ListPubSubAsyncResult where each PubSubChannel has the following attributes:

Name	Type	Description
Name	string	The name of the Pub/Sub channel.
Type	string	The type of the Pub/Sub channel.
LastActivity	long	The timestamp of the last activity on the channel, represented in milliseconds since epoch.
IsActive	boolean	Indicates whether the channel is active or not.
Incoming	PubSubChannel	The statistics related to incoming messages for this channel.
Outgoing	PubSubChannel	The statistics related to outgoing messages for this channel.

Example

static async Task<EventsStoreClient> CreateEventsStoresClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      EventsStoreClient client = new EventsStoreClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task ListEventsStoresChannels()
  {
      EventsStoreClient client =await CreateEventsStoresClient();
      ListPubSubAsyncResult listResult = await client.List();
      if (!listResult.IsSuccess)
      {
          Console.WriteLine($"Could not list events-store channels, error:{listResult.ErrorMessage}");
          return;
      }
      
      foreach (var channel in listResult.Channels)
      {
          Console.WriteLine($"{channel}");
      }
      await client.Close();
  }

Send & Subscribe EventStore

Send and subscribe to event messages.

Request: EventStore Class Attributes

Name	Type	Description	Default Value	Mandatory
Id	String	Unique identifier for the event message.	None	No
Channel	String	The channel to which the event message is sent.	None	Yes
Metadata	String	Metadata associated with the event message.	None	No
Body	byte[]	Body of the event message in bytes.	Empty byte array	No
Tags	Map<String, String>	Tags associated with the event message as key-value pairs.	Empty Map	No

Subscribe To EventsStore Messages

Subscribes to receive messages from an EventsStore channel.

Request: EventsStoreSubscription Class Attributes

Name	Type	Description	Default Value	Mandatory
Channel	string	The channel to subscribe to.	None	Yes
Group	string	The group to subscribe with.	None	No
ReceiveEventHandler	delegate(EventStore)	Callback function to be called when an event message is received.	None	Yes
OnErrorCallback	delegate(Exception)	Callback function to be called when an error occurs.	None	No
StartAt	StartAtType	Type of EventsStore subscription (e.g., StartAtTime, StartAtSequence)	None	Yes
StartAtTimeValue	long	Start time for EventsStore subscription (if applicable)	None	Conditional
StartAtSequenceValue	long	Start sequence for EventsStore subscription (if applicable)	None	Conditional

StartAtType Options

Type	Value	Description
Undefined	0	Default value, should be explicitly set to a valid type before use
StartNewOnly	1	Start storing events from the point when the subscription is made
StartFromFirst	2	Start storing events from the first event available
StartFromLast	3	Start storing events from the last event available
StartAtSequence	4	Start storing events from a specific sequence number
StartAtTime	5	Start storing events from a specific point in time
StartAtTimeDelta	6	Start storing events from a specific time delta in seconds

Example

static async Task<EventsStoreClient> CreateEventsStoresClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      EventsStoreClient client = new EventsStoreClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task SendSubscribe()
  {
      EventsStoreClient client =await CreateEventsStoresClient();
      var subscription = new EventsStoreSubscription()
          .SetChannel("es1")
          .SetGroup("")
          .SetStartAtType(StartAtType.StartAtTypeFromSequence)
          .SetStartAtSequence(1)
          .SetOnReceiveEvent(receivedEvent =>
          {
              Console.WriteLine($"Event Store Received: Id:{receivedEvent.Id}, Body:{Encoding.UTF8.GetString(receivedEvent.Body)}");
          })
          .SetOnError(exception =>
          {
              Console.WriteLine($"Error: {exception.Message}");
          });
      Result subscribeResult =  client.Subscribe(subscription);
      if (!subscribeResult.IsSuccess)
      {
          Console.WriteLine($"Could not subscribe to KubeMQ Server, error:{subscribeResult.ErrorMessage}");
          return;
      }
      Thread.Sleep(1000);
      EventStore msg = new EventStore().SetChannel("es1").SetBody("hello kubemq - sending an event store message"u8.ToArray());
      Result sendResult=  await client.Send(msg);
      if (!sendResult.IsSuccess)
      {
          Console.WriteLine($"Could not send an event to KubeMQ Server, error:{sendResult.ErrorMessage}");
          return;
      }
      await  client.Close ();
  }

Commands & Queries – Commands Operations

Create Channel

Create a new Command channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to create	None	Yes

Response

Return Result object

Example

static async Task<CommandsClient> CreateCommandsClient()
  {
      Configuration cfg = new Configuration().SetAddress("localhost:50000").SetClientId("Some-client-id");
          
      CommandsClient client = new CommandsClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
  
  static async Task CreateCommandsChannel()
  {
      CommandsClient client =await CreateCommandsClient();
      Result result = await client.Create("command_1");
      if (!result.IsSuccess)
      {
          Console.WriteLine($"Could not create commands channel, error:{result.ErrorMessage}");
          return;
      }
      Console.WriteLine("Commands Channel Created");
      await client.Close();
  }

Delete Channel

Delete an existing Command channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to delete	None	Yes

Response

Return Result object

Example

static async Task<CommandsClient> CreateCommandsClient()
  {
      Configuration cfg = new Configuration().SetAddress("localhost:50000").SetClientId("Some-client-id");
          
      CommandsClient client = new CommandsClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task DeleteCommandsChannel()
  {
      CommandsClient client =await CreateCommandsClient();
      Result result = await client.Delete("command_1");
      if (!result.IsSuccess)
      {
          Console.WriteLine($"Could not delete commands channel, error:{result.ErrorMessage}");
          return;
      }
      Console.WriteLine("Commands Channel Deleted");
      await client.Close();
  }

List Channels

Retrieve a list of Command channels.

Request Parameters

Name	Type	Description	Default Value	Mandatory
searchstring	string	Search query to filter channels (optional)	None	No

Response

Returns a ListCqAsyncResult where each CQChannel has the following attributes:

Name	Type	Description
Name	string	The name of the channel.
Type	string	The type of the channel.
LastActivity	long	The timestamp of the last activity on the channel
IsActive	boolean	Indicates whether the channel is currently active
Incoming	CQChannel	Statistics about incoming messages to the channel
Outgoing	CQChannel	Statistics about outgoing messages from the channel

Example

static async Task<CommandsClient> CreateCommandsClient()
  {
      Configuration cfg = new Configuration().SetAddress("localhost:50000").SetClientId("Some-client-id");
          
      CommandsClient client = new CommandsClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task ListCommandsChannels()
  {
      CommandsClient client =await CreateCommandsClient();
      ListCqAsyncResult listResult = await client.List();
      if (!listResult.IsSuccess)
      {
          Console.WriteLine($"Could not list commands channels, error:{listResult.ErrorMessage}");
          return;
      }
      
      foreach (var channel in listResult.Channels)
      {
          Console.WriteLine($"{channel}");
      }
      await client.Close();
  }

Send Receive Response Command

Send a command request to a Command channel.

Request: Command Class Attributes

Name	Type	Description	Default Value	Mandatory
Id	string	The ID of the command message.	None	Yes
Channel	string	The channel through which the command message will be sent.	None	Yes
Metadata	string	Additional metadata associated with the command message.	None	No
Body	byte[]	The body of the command message as bytes.	Empty byte array	No
Tags	Map<string, string>	A dictionary of key-value pairs representing tags associated with the command message.	Empty Map	No
TimeoutInSeconds	int	The maximum time in seconds for waiting to response.	None	Yes

Response: CommandResponse Class Attributes

Name	Type	Description
CommandReceived	CommandMessageReceived	The command message received in the response.
ClientId	string	The client ID associated with the command response.
RequestId	string	The unique request ID of the command response.
IsExecuted	boolean	Indicates if the command has been executed.
Timestamp	Timestamp	The timestamp when the command response was created.
Error	string	The error message if there was an error.

Subscribe To Commands

Subscribes to receive command messages from a Command channel.

Request: CommandsSubscription Class Attributes

Name	Type	Description	Default Value	Mandatory
Channel	string	The channel for the subscription.	None	Yes
Group	string	The group associated with the subscription.	None	No
ReceivedCommandHandler	delegate(CommandMessageReceived)	Callback function for receiving commands.	None	Yes
ErrorHandler	delegate(Exception)	Callback function for error handling.	None	No

Example

static async Task<CommandsClient> CreateCommandsClient()
  {
      Configuration cfg = new Configuration().SetAddress("localhost:50000").SetClientId("Some-client-id");
          
      CommandsClient client = new CommandsClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task SendReceiveResponse()
  {
      CommandsClient client =await CreateCommandsClient();
      var subscription = new CommandsSubscription()
          .SetChannel("c1")
          .SetGroup("")
          .SetOnReceivedCommand(async receivedCommand =>
          {
              Console.WriteLine($"Command Received: Id:{receivedCommand.Id}, Body:{Encoding.UTF8.GetString(receivedCommand.Body)}");
              CommandResponse response = new CommandResponse()
                  .SetRequestId(receivedCommand.Id)
                  .SetCommandReceived(receivedCommand)
                  .SetIsExecuted(true);
              Result responseResult = await client.Response(response);
              if (!responseResult.IsSuccess)
              {
                  Console.WriteLine($"Error sending response to KubeMQ, error:{responseResult.ErrorMessage}");
              }
              Console.WriteLine($"Command Executed: Id:{receivedCommand.Id}");
  
          })
          .SetOnError(exception =>
          {
              Console.WriteLine($"Error: {exception.Message}");
          });
      Result subscribeResult =  client.Subscribe(subscription);
      if (!subscribeResult.IsSuccess)
      {
          Console.WriteLine($"Could not subscribe to KubeMQ Server, error:{subscribeResult.ErrorMessage}");
          return;
      }
      Thread.Sleep(1000);
      Command msg = new Command()
          .SetChannel("c1")
          .SetBody("hello kubemq - sending a command message"u8.ToArray())
          .SetTimeout(10);
      CommandResponse sendResult=  await client.Send(msg);
      Console.WriteLine($"Command Response: {sendResult}");
      await  client.Close ();
  }

Commands & Queries – Queries Operations

Create Channel

Create a new Query channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to create	None	Yes

Response

Return Result object

Example

static async Task<QueriesClient> CreateQueriesClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      QueriesClient client = new QueriesClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
  static async Task CreateQueriesChannel()
  {
      QueriesClient client =await CreateQueriesClient();
      Result result = await client.Create("query_1");
      if (!result.IsSuccess)
      {
          Console.WriteLine($"Could not create queries channel, error:{result.ErrorMessage}");
          return;
      }
      Console.WriteLine("Queries Channel Created");
      await client.Close();
  }

Delete Channel

Delete an existing Query channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to delete	None	Yes

Response

Return Result object

Example

static async Task<QueriesClient> CreateQueriesClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      QueriesClient client = new QueriesClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task DeleteQueriesChannel()
  {
      QueriesClient client =await CreateQueriesClient();
      Result result = await client.Delete("query_1");
      if (!result.IsSuccess)
      {
          Console.WriteLine($"Could not delete queries channel, error:{result.ErrorMessage}");
          return;
      }
      Console.WriteLine("Queries Channel Deleted");
      await client.Close();
  }

List Channels

Retrieve a list of Query channels.

Request Parameters

Name	Type	Description	Default Value	Mandatory
searchstring	string	Search query to filter channels (optional)	None	No

Response

Returns a ListCqAsyncResult where each CQChannel has the following attributes:

Name	Type	Description
Name	string	The name of the channel.
Type	string	The type of the channel.
LastActivity	long	The timestamp of the last activity on the channel
IsActive	boolean	Indicates whether the channel is currently active
Incoming	CQChannel	Statistics about incoming messages to the channel
Outgoing	CQChannel	Statistics about outgoing messages from the channel

Example

static async Task<QueriesClient> CreateQueriesClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      QueriesClient client = new QueriesClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task ListQueriesChannels()
  {
      QueriesClient client =await CreateQueriesClient();
      ListCqAsyncResult listResult = await client.List();
      if (!listResult.IsSuccess)
      {
          Console.WriteLine($"Could not list queries channels, error:{listResult.ErrorMessage}");
          return;
      }
      
      foreach (var channel in listResult.Channels)
      {
          Console.WriteLine($"{channel}");
      }
      await client.Close();
  }

Send Receive Response Query

Send a query request to a Query channel.

Request: Query Class Attributes

Name	Type	Description	Default Value	Mandatory
Id	string	The ID of the command message.	None	Yes
Channel	string	The channel through which the command message will be sent.	None	Yes
Metadata	string	Additional metadata associated with the command message.	None	No
Body	byte[]	The body of the command message as bytes.	Empty byte array	No
Tags	Map<string, string>	A dictionary of key-value pairs representing tags associated with the command message.	Empty Map	No
TimeoutInSeconds	int	The maximum time in seconds for waiting to response.	None	Yes

Response: QueryResponse Class Attributes

Name	Type	Description
CommandReceived	CommandMessageReceived	The command message received in the response.
ClientId	string	The client ID associated with the command response.
RequestId	string	The unique request ID of the command response.
IsExecuted	boolean	Indicates if the command has been executed.
Timestamp	Timestamp	The timestamp when the command response was created.
Error	string	The error message if there was an error.
Metadata	string	Additional metadata associated with the response.
Body	byte[]	The body of the query response as bytes.

Subscribe To Commands

Subscribes to receive query messages from a Query channel.

Request: QueriesSubscription Class Attributes

Name	Type	Description	Default Value	Mandatory
Channel	string	The channel for the subscription.	None	Yes
Group	string	The group associated with the subscription.	None	No
ReceivedQueryHandler	delegate(QueryMessageReceived)	Callback function for receiving queries.	None	Yes
ErrorHandler	delegate(Exception)	Callback function for error handling.	None	No

Example

static async Task<QueriesClient> CreateQueriesClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      QueriesClient client = new QueriesClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
static async Task SendReceiveResponse()
{
    QueriesClient client =await CreateQueriesClient();
    var subscription = new QueriesSubscription()
        .SetChannel("q1")
        .SetGroup("")
        .SetOnReceivedQuery(async receivedQuery =>
        {
            Console.WriteLine($"Query Received: Id:{receivedQuery.Id}, Body:{Encoding.UTF8.GetString(receivedQuery.Body)}");
            QueryResponse response = new QueryResponse()
                .SetRequestId(receivedQuery.Id)
                .SetQueryReceived(receivedQuery)
                .SetIsExecuted(true)
                .SetBody(Encoding.UTF8.GetBytes("query response"));
            Result responseResult = await client.Response(response);
            if (!responseResult.IsSuccess)
            {
                Console.WriteLine($"Error sending response to KubeMQ, error:{responseResult.ErrorMessage}");
            }
            Console.WriteLine($"Query Executed: Id:{receivedQuery.Id}");

        })
        .SetOnError(exception =>
        {
            Console.WriteLine($"Error: {exception.Message}");
        });
      Result subscribeResult =  client.Subscribe(subscription);
      if (!subscribeResult.IsSuccess)
      {
          Console.WriteLine($"Could not subscribe to KubeMQ Server, error:{subscribeResult.ErrorMessage}");
          return;
      }
      Thread.Sleep(1000);
      Query msg = new Query()
          .SetChannel("q1")
          .SetBody("hello kubemq - sending a query message"u8.ToArray())
          .SetTimeout(10);
      QueryResponse sendResult=  await client.Send(msg);
      Console.WriteLine($"Query Response: {sendResult}");
      await  client.Close ();
}

Queues Operations

Create Channel

Create a new Queue channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to create	None	Yes

Response

Return Result object

Example

static async Task<QueuesClient> CreateQueuesClient()
  {
      Configuration cfg = new Configuration().
          SetAddress("localhost:50000").
          SetClientId("Some-client-id");
      QueuesClient client = new QueuesClient();
      Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
      if (!connectResult.IsSuccess)
      {
          Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
          throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
      }
      return client;
  }
  static async Task  CreateQueue()
  {
      QueuesClient client = await CreateQueuesClient();
      Result result = await client.Create("q1");
      if (!result.IsSuccess)
      {
          Console.WriteLine($"Could not create queue channel, error:{result.ErrorMessage}");
      }
      Console.WriteLine("Queues Channel Created");
      await client.Close();
  }

Delete Channel

Delete an existing Queue channel.

Request Parameters

Name	Type	Description	Default Value	Mandatory
channelName	string	Name of the channel you want to delete	None	Yes

Response

Return Result object

Example

static async Task<QueuesClient> CreateQueuesClient()
{
    Configuration cfg = new Configuration().
        SetAddress("localhost:50000").
        SetClientId("Some-client-id");
    QueuesClient client = new QueuesClient();
    Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
    if (!connectResult.IsSuccess)
    {
        Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
    }
    return client;
}
static async Task DeleteQueue()
  {
      QueuesClient client = await CreateQueuesClient();
      Result result = await client.Delete("q1");
      if (!result.IsSuccess)
      {
          Console.WriteLine($"Could not delete queues channel, error:{result.ErrorMessage}");
          return;
      }
      Console.WriteLine("Queues Channel Deleted");
      await client.Close();
        }

List Channels

Retrieve a list of Queue channels.

Request Parameters

Name	Type	Description	Default Value	Mandatory
searchstring	string	Search query to filter channels (optional)	None	No

Response

Returns a ListQueuesAsyncResult where each QueuesChannel has the following attributes:

Name	Type	Description
Name	string	The name of the Pub/Sub channel.
Type	string	The type of the Pub/Sub channel.
LastActivity	long	The timestamp of the last activity on the channel, represented in milliseconds since epoch.
IsActive	boolean	Indicates whether the channel is active or not.
Incoming	PubSubChannel	The statistics related to incoming messages for this channel.
Outgoing	PubSubChannel	The statistics related to outgoing messages for this channel.

Example

static async Task<QueuesClient> CreateQueuesClient()
{
    Configuration cfg = new Configuration().
        SetAddress("localhost:50000").
        SetClientId("Some-client-id");
    QueuesClient client = new QueuesClient();
    Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
    if (!connectResult.IsSuccess)
    {
        Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
    }
    return client;
}
static async Task ListQueues()
{
    QueuesClient client = await CreateQueuesClient();
    ListQueuesAsyncResult listResult = await client.List();
    if (!listResult.IsSuccess)
    {
        Console.WriteLine($"Could not list queues channels, error:{listResult.ErrorMessage}");
        return;
    }
    foreach (var channel in listResult.Channels)
    {
        Console.WriteLine($"{channel}");
    }
    await client.Close();
}

Send / Receive Queue Messages

Send and receive messages from a Queue channel.

Send Request: QueueMessage

Name	Type	Description	Default Value	Mandatory
Id	String	The unique identifier for the message.	None	No
Channel	String	The channel of the message.	None	Yes
Metadata	String	The metadata associated with the message.	None	No
Body	byte[]	The body of the message.	new byte[0]	No
Tags	Map<String, String>	The tags associated with the message.	new HashMap<>()	No
Policy	QueueMessagePolicy	The policy associated with the message.	None	No

Policy Options

Name	Type	Description	Default Value	Mandatory
DelaySeconds	int	The delay in seconds before the message becomes available in the queue.	None	No
ExpirationSeconds	int	The expiration time in seconds for the message.	None	No
MaxReceiveCount	int	The number of receive attempts allowed for the message before it is moved to the dead letter queue.	None	No
MaxReceiveQueue	String	The dead letter queue where the message will be moved after reaching the maximum receive attempts.	None	No

Send Queue Message

Send a message to a Queue channel.

Request: QueueMessage Class Attributes

Name	Type	Description	Default Value	Mandatory
id	string	The unique identifier for the message.	None	No
channel	string	The channel of the message.	None	Yes
metadata	string	The metadata associated with the message.	None	No
body	byte[]	The body of the message.	new byte[0]	No
tags	Map<string, string>	The tags associated with the message.	new HashMap<>()	No
delayInSeconds	int	The delay in seconds before the message becomes available in the queue.	None	No
expirationInSeconds	int	The expiration time in seconds for the message.	None	No
attemptsBeforeDeadLetterQueue	int	The number of receive attempts allowed for the message before it is moved to the dead letter queue.	None	No
deadLetterQueue	string	The dead letter queue where the message will be moved after reaching the maximum receive attempts.	None	No

Receive Request: PollRequest

Name	Type	Description	Default Value	Mandatory
Queue	String	The channel to poll messages from.	None	Yes
MaxItems	int	The maximum number of messages to poll.	1	No
WaitTimeout	int	The wait timeout in seconds for polling messages.	60	No
AutoAck	boolean	Indicates if messages should be auto-acknowledged.	false	No
VisibilitySeconds	int	Add a visibility timeout feature for messages.	0	No

Response: PollResponse

Name	Type	Description
Messages	List	The list of received queue messages.

Example #1

static async Task<QueuesClient> CreateQueuesClient()
{
    Configuration cfg = new Configuration().
        SetAddress("localhost:50000").
        SetClientId("Some-client-id");
    QueuesClient client = new QueuesClient();
    Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
    if (!connectResult.IsSuccess)
    {
        Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
    }
    return client;
}
static async Task SendQueueMessage()
{
    QueuesClient client = await CreateQueuesClient();
    Console.WriteLine("Sending queue message");
    Message msg= new Message()
    {
        MessageID = "1",
        Queue ="send_receive_queue",
        Body = "hello kubemq - sending an queue message"u8.ToArray(),
        Tags = new Dictionary<string, string>()
            {
                {"key1", "value1"},
                {"key2", "value2"} 
            },
        
        Policy = new QueueMessagePolicy()
        {
            DelaySeconds = 1,
            ExpirationSeconds = 10,
        }
    };
    SendResponse sendResult = await client.Send(msg);
    if (sendResult.Error != null)
    {
        Console.WriteLine($"Could not send queue message, error:{sendResult.Error}");
        return;
    }
    Thread.Sleep(1000);
    Console.WriteLine("Polling queue message");
    PollRequest pollRequest = new PollRequest()
    {
        Queue = "send_receive_queue",
        WaitTimeout = 1000,
        MaxItems = 1,
        
    };
    PollResponse response = await client.Poll(pollRequest);
    if (response.Error != null)
    {
        Console.WriteLine($"Could not poll queue message, error:{response.Error}");
        return;
    }
    
    // Acknowledge all messages
    // response.AckAll();
    //
    // // Reject all messages
    // response.RejectAll();
    //
    // // Requeue all messages
    // response.ReQueueAll("requeue");
    
    foreach (var receiveMsg in response.Messages)
    {
        Console.WriteLine(Encoding.UTF8.GetString(receiveMsg.Body));
        // Acknowledge the message
        receiveMsg.Ack();
        
        // Reject the message
         //receiveMsg.Reject();
        
        // Requeue the message
        //receiveMsg.ReQueue("requeue");
    }
    
    await client.Close();
}
        

Example #2

static async Task<QueuesClient> CreateQueuesClient()
{
    Configuration cfg = new Configuration().
        SetAddress("localhost:50000").
        SetClientId("Some-client-id");
    QueuesClient client = new QueuesClient();
    Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
    if (!connectResult.IsSuccess)
    {
        Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
    }
    return client;
}
static async Task SendQueueMessageWithAutoAck()
{
    QueuesClient client = await CreateQueuesClient();
    Console.WriteLine("Sending queue message");
    Message msg= new Message()
    {
        MessageID = "1",
        Queue ="send_receive_queue_auto_ack",
        Body = "hello kubemq - sending an queue message"u8.ToArray(),
    };
    SendResponse sendResult = await client.Send(msg);
    if (sendResult.Error != null)
    {
        Console.WriteLine($"Could not send queue message, error:{sendResult.Error}");
        return;
    }
    Thread.Sleep(1000);
    Console.WriteLine("Polling queue message");
    PollRequest pollRequest = new PollRequest()
    {
        Queue = "send_receive_queue",
        WaitTimeout = 1000,
        MaxItems = 1,
        AutoAck = true,
    };
    PollResponse response = await client.Poll(pollRequest);
    if (response.Error != null)
    {
        Console.WriteLine($"Could not poll queue message, error:{response.Error}");
        return;
    }
    foreach (var receiveMsg in response.Messages)
    {
        Console.WriteLine(Encoding.UTF8.GetString(receiveMsg.Body));
    }
    await client.Close();
}
        

Example #3

static async Task<QueuesClient> CreateQueuesClient()
{
    Configuration cfg = new Configuration().
        SetAddress("localhost:50000").
        SetClientId("Some-client-id");
    QueuesClient client = new QueuesClient();
    Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
    if (!connectResult.IsSuccess)
    {
        Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
    }
    return client;
}

static async Task SendQueueMessageWithDeadLetterQueue()
{
    QueuesClient client = await CreateQueuesClient();
    Console.WriteLine("Sending queue message");
    Message msg= new Message()
    {
        MessageID = "1",
        Queue ="send_receive_queue_dlq",
        Body = "Message with Deadletter Queue"u8.ToArray(),
        Policy = new QueueMessagePolicy()
        {
            MaxReceiveCount = 3,
            MaxReceiveQueue = "dlq",
        }
    };
    SendResponse sendResult = await client.Send(msg);
    if (sendResult.Error != null)
    {
        Console.WriteLine($"Could not send queue message, error:{sendResult.Error}");
        return;
    }
    Thread.Sleep(1000);
    Console.WriteLine("Polling queue message and reject it, break when no message to poll");
    for (int i = 0; i < 10; i++)
    {
        PollRequest pollRequest = new PollRequest()
        {
            Queue = "send_receive_queue_dlq",
            WaitTimeout = 1000,
            MaxItems = 1,
        };
        PollResponse response = await client.Poll(pollRequest);
        if (response.Error != null)
        {
            Console.WriteLine($"Could not poll queue message, error:{response.Error}");
            return;
        }
        if (response.Messages.Count == 0)
        {
            break;
        }
        foreach (var receiveMsg in response.Messages)
        {
            Console.WriteLine($"Message received: {Encoding.UTF8.GetString(receiveMsg.Body)}, Receiving count: {receiveMsg.Attributes.ReceiveCount}, rejecting message");
            // Reject the message
            receiveMsg.Reject();
        }
    }
    Console.WriteLine("Polling dlq queue for rejected messages");
    PollRequest dlqPollRequest = new PollRequest()
    {
        Queue = "dlq",
        WaitTimeout = 1000,
        MaxItems = 1,
    };
    PollResponse dlqResponse = await client.Poll(dlqPollRequest);
    if (dlqResponse.Error != null)
    {
        Console.WriteLine($"Could not poll dlq queue message, error:{dlqResponse.Error}");
        return;
    }
    foreach (var receiveMsg in dlqResponse.Messages)
    {
        Console.WriteLine($"Message received from dlq: {Encoding.UTF8.GetString(receiveMsg.Body)}");
        receiveMsg.Ack();
    }
    client.Close();
}

Example #4

static async Task<QueuesClient> CreateQueuesClient()
{
    Configuration cfg = new Configuration().
        SetAddress("localhost:50000").
        SetClientId("Some-client-id");
    QueuesClient client = new QueuesClient();
    Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
    if (!connectResult.IsSuccess)
    {
        Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
    }
    return client;
}

static async Task SendQueueMessageWithVisibility()
{
    QueuesClient client = await CreateQueuesClient();
    Console.WriteLine("Sending queue message");
    Message msg= new Message()
    {
        MessageID = "1",
        Queue ="send_receive_visibility",
        Body = "Message with visbility"u8.ToArray(),
        
    };
    SendResponse sendResult = await client.Send(msg);
    if (sendResult.Error != null)
    {
        Console.WriteLine($"Could not send queue message, error:{sendResult.Error}");
        return;
    }
    Thread.Sleep(1000);
    Console.WriteLine("Polling queue message with visibility");
    PollRequest pollRequest = new PollRequest()
    {
        Queue = "send_receive_visibility",
        WaitTimeout = 1000,
        MaxItems = 1,
        VisibilitySeconds = 3,
    };

    PollResponse response = await client.Poll(pollRequest);
    if (response.Error != null)
    {
        Console.WriteLine($"Could not poll queue message, error:{response.Error}");
        return;
    }
    foreach (var receiveMsg in response.Messages)
    {
        Console.WriteLine($"Message received, doing some work");
        Thread.Sleep(2000);
        Console.WriteLine($"Message processed, need more time to ack, extending visibility by 5 seconds");
        receiveMsg.ExtendVisibility(5);
        Console.WriteLine($"Do some more work for 2 seconds");
        Thread.Sleep(2000);
        Console.WriteLine($"Ack the message");
        receiveMsg.Ack();
    }
    await client.Close();
}

Example #5

static async Task<QueuesClient> CreateQueuesClient()
{
    Configuration cfg = new Configuration().
        SetAddress("localhost:50000").
        SetClientId("Some-client-id");
    QueuesClient client = new QueuesClient();
    Result connectResult = await client.Connect(cfg,new CancellationTokenSource().Token);
    if (!connectResult.IsSuccess)
    {
        Console.WriteLine($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
        throw new Exception($"Could not connect to KubeMQ Server, error:{connectResult.ErrorMessage}");
    }
    return client;
}

static async Task SendQueueMessageWithVisibilityExpiration()
  {
      QueuesClient client = await CreateQueuesClient();
      Console.WriteLine("Sending queue message");
      Message msg= new Message()
      {
          MessageID = "1",
          Queue ="send_receive_visibility",
          Body = "Message with visbility"u8.ToArray(),
          
      };
      SendResponse sendResult = await client.Send(msg);
      if (sendResult.Error != null)
      {
          Console.WriteLine($"Could not send queue message, error:{sendResult.Error}");
          return;
      }
      Thread.Sleep(1000);
      Console.WriteLine("Polling queue message with visibility");
      PollRequest pollRequest = new PollRequest()
      {
          Queue = "send_receive_visibility",
          WaitTimeout = 1000,
          MaxItems = 1,
          VisibilitySeconds = 3
      };
  
      PollResponse response = await client.Poll(pollRequest);
      if (response.Error != null)
      {
          Console.WriteLine($"Could not poll queue message, error:{response.Error}");
          return;
      }
      foreach (var receiveMsg in response.Messages)
      {
          Console.WriteLine($"Message received, doing some work for 4 seconds");
          Thread.Sleep(4000);
          receiveMsg.ExtendVisibility(4);
      }
      await client.Close();
  }