STOMP Component

Properties   Methods   Events   Config Settings   Errors  

A simple but powerful STOMP client implementation.

Syntax

nsoftware.IPWorksMQ.Stomp

Remarks

The STOMP component provides an easy-to-use STOMP client implementation that supports STOMP versions 1.1 and 1.2. The component supports both plaintext and TLS-enabled connections over TCP.

Connecting

Connecting to a STOMP server is easy; in the simplest case just call the ConnectTo method, passing the server's hostname and port number.

When connecting to a STOMP server, the component sends information from the following properties, if populated:

• IncomingHeartbeat
• OutgoingHeartbeat
• User
• Password

In addition to the above properties, the following configuration settings can be set before connecting (though in most cases this is not necessary):

• SupportedVersions: Controls which STOMP versions the component advertises support for.
• VirtualHost: Controls the virtual host to connect to. If left empty (default), the value from RemoteHost is used.

Subscriptions & Receiving Messages

When Subscribe is called, it will return a subscription Id. To unsubscribe, pass this subscription Id to the Unsubscribe method.

After subscribing to a message destination, any messages received will cause the MessageIn event to fire.

Basic Subscriptions Example stomp1.OnMessageIn += (s, e) => { Console.WriteLine("Received message from destination '" + e.Destination + "':"); Console.WriteLine(e.Data); }; string subId = stomp1.Subscribe("test/a/b", false); // Some time later... stomp1.Unsubscribe(subId);

Refer to Subscribe, Unsubscribe, and MessageIn for more information about subscriptions and receiving messages.

Sending Messages

To send messages, use the SendMessage and SendData methods. SendMessage is used to send messages with string payloads, while SendData is used to send messages with binary payloads.

Send String Message Example stomp1.SendMessage("test/a/b", "Hello, world!");

Send Binary Message Example byte[] fileContent = File.ReadAllBytes("C:\test\stuff.dat"); stomp1.SendData("test/a/b", fileContent);

Refer to SendMessage and SendData for more information about sending messages.

Using Transactions

STOMP transactions are used to group messages together for processing on the server. Messages sent as part of a transaction will not be delivered by the server until the transaction is committed. If the transaction is aborted, the server will discard the messages without attempting to deliver them.

Basic Transaction Example // Open a new transaction. stomp1.BeginTransaction("txn1"); // Set the Transaction property to make sure that messages are sent as part of the transaction. stomp1.Transaction = "txn1"; stomp1.SendMessage("test/a/b", "Hello, world!"); stomp1.SendMessage("test/a/b", "This is a test."); stomp1.SendMessage("test/a/b", "Another test!"); // At this point, none of the messages sent above would have been delivered to any clients // subscribed to the "test/a/b" destination yet, because the transaction is still open. // If we close and commit the transaction, the server will then deliver the messages to subscribers, // queue them, or process them in another manner; the behavior is server-dependent. stomp1.CommitTransaction("txn1"); // Or, the transaction can be aborted, in which case the server will discard the messages // without delivering them to the subscribers. //stomp1.AbortTransaction("txn1"); // Reset (or change) the Transaction property after committing or aborting a transaction // so that future messages are not associated with the previous transaction. stomp1.Transaction = "";

Refer to BeginTransaction for more information about using transactions.

Property List

The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the component with short descriptions. Click on the links for further details.

Connected Property (STOMP Component)

Triggers a connection or disconnection.

Syntax

• C#
• VB.NET

public bool Connected { get; set; }

Public Property Connected As Boolean

Default Value

False

Remarks

This property triggers a connection or disconnection. Setting this property to True makes the component attempt to connect to the host identified by the RemoteHost property. If successful, after the connection is achieved the value of the property changes to True and the Connected event is fired.

Setting this property to False closes the connection.

When connecting to a STOMP server, the component sends information from the following properties, if populated:

• IncomingHeartbeat
• OutgoingHeartbeat
• User
• Password

In addition to the above properties, the following configuration settings can be set before connecting (though in most cases this is not necessary):

• SupportedVersions: Controls which STOMP versions the component advertises support for.
• VirtualHost: Controls the virtual host to connect to. If left empty (default), the value from RemoteHost is used.

This property is not available at design time.

ContentType Property (STOMP Component)

The content type of the outgoing message.

Syntax

• C#
• VB.NET

public string ContentType { get; set; }

Public Property ContentType As String

Default Value

"text/plain"

Remarks

This property is used to specify the content type (MIME type) for outgoing messages sent using SendMessage. The default value is text/plain, which should be sufficient is most cases.

Note that this property is ignored for messages sent using SendData, as such messages do not have a content-type header added to them. The absence of a content-type header indicates to the server that the data should be treated as a binary blob.

This property is not available at design time.

Firewall Property (STOMP Component)

A set of properties related to firewall access.

Syntax

• C#
• VB.NET

public Firewall Firewall { get; set; }

Public Property Firewall As Firewall

Remarks

This is a Firewall-type property, which contains fields describing the firewall through which the component will attempt to connect.

Headers Property (STOMP Component)

User-defined headers added to outgoing messages.

Syntax

• C#
• VB.NET

public STOMPHeaderList Headers { get; }

Public Property Headers As STOMPHeaderList

Remarks

This property holds a collection of STOMPHeader items representing user-defined headers. The headers in this collection are added to each outgoing message sent with SendMessage or SendData.

Note that the STOMP specification defines a number of standard headers necessary for implementing the STOMP protocol. When constructing an outgoing message, the component silently ignores any user-defined headers that are already set by the component.

This property is not available at design time.

IncomingHeartbeat Property (STOMP Component)

Specifies the server-to-component heartbeat timing.

Syntax

• C#
• VB.NET

public int IncomingHeartbeat { get; set; }

Public Property IncomingHeartbeat As Integer

Default Value

0

Remarks

This property specifies the incoming heartbeat interval, which is the number of seconds without any server-to-component communication that the server will allow to elapse before sending the component a heartbeat (keepalive). If set to 0 (default), incoming heartbeats are disabled.

For information about outgoing (component-to-server) heartbeats; see the OutgoingHeartbeat property.

Before Connecting

Before connecting, this property is used to specify the desired incoming heartbeat interval (in seconds). By default, this property is set to 0 (no heartbeat).

During the connection process, the incoming heartbeat interval requested by the component is compared to the minimum interval supported by the server, and the larger of the two values is selected. If one or both sides supply 0 as their value, then no server-to-component heartbeats will be sent.

After Connecting

After connecting, this property cannot be set. Instead, it reflects the incoming heartbeat interval agreed upon by the component and the server during the connection process.

As the incoming heartbeat interval negotiation notes above imply, it is possible that the agreed-upon incoming heartbeat interval may either be larger than what the component requested, or may be 0 (i.e., incoming heartbeats are disabled).

This property is not available at design time.

LocalHost Property (STOMP Component)

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

Syntax

• C#
• VB.NET

public string LocalHost { get; set; }

Public Property LocalHost As String

Default Value

""

Remarks

The LocalHost property contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.

In multi-homed hosts (machines with more than one IP interface) setting LocalHost to the value of an interface will make the component initiate connections (or accept in the case of server components) only through that interface.

If the component is connected, the LocalHost property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multi-homed hosts (machines with more than one IP interface).

NOTE: LocalHost is not persistent. You must always set it in code, and never in the property window.

LocalPort Property (STOMP Component)

The TCP port in the local host where the component binds.

Syntax

• C#
• VB.NET

public int LocalPort { get; set; }

Public Property LocalPort As Integer

Default Value

0

Remarks

This property must be set before a connection is attempted. It instructs the component to bind to a specific port (or communication endpoint) in the local machine.

Setting this property to 0 (default) enables the system to choose an open port at random. The chosen port will be returned by the LocalPort property after the connection is established.

LocalPort cannot be changed once a connection is made. Any attempt to set this property when a connection is active will generate an error.

This property is useful when trying to connect to services that require a trusted port in the client side.

OutgoingHeartbeat Property (STOMP Component)

Specifies the component-to-server heartbeat timing.

Syntax

• C#
• VB.NET

public int OutgoingHeartbeat { get; set; }

Public Property OutgoingHeartbeat As Integer

Default Value

0

Remarks

This property specifies the outgoing heartbeat interval, which is the number of seconds without any component-to-server communication that the component will allow to elapse before sending the server a heartbeat (keepalive). If set to 0 (default), outgoing heartbeats are disabled.

For information about incoming (server-to-component) heartbeats; see the IncomingHeartbeat property.

Before Connecting

Before connecting, this property is used to specify the minimum supported outgoing heartbeat interval (in seconds). By default, this property is set to 0 (no heartbeat).

During the connection process, the minimum outgoing heartbeat interval supported by the component is compared to the interval requested by the server, and the larger of the two values is selected. If one or both sides supply 0 as their value, then no component-to-server heartbeats will be sent.

After Connecting

After connecting, this property cannot be set. Instead, it reflects the outgoing heartbeat interval agreed upon by the component and the server during the connection process.

As the outgoing heartbeat interval negotiation notes above imply, it is possible that the agreed-upon outgoing heartbeat interval may either be larger than the component's supported minimum, or may be 0 (i.e., outgoing heartbeats are disabled).

This property is not available at design time.

ParsedHeaders Property (STOMP Component)

Headers parsed from incoming messages.

Syntax

• C#
• VB.NET

public STOMPHeaderList ParsedHeaders { get; }

Public ReadOnly Property ParsedHeaders As STOMPHeaderList

Remarks

This property holds a collection of STOMPHeader items, representing both standard and user-defined headers parsed from incoming messages. It is populated each time the MessageIn event fires, and is cleared after the MessageIn event completes.

Note that the component collapses headers with duplicate key names by default for incoming messages, only keeping the first header for each unique key. This behavior can be controlled using the CollapseHeaders configuration setting.

This property is read-only and not available at design time.

Password Property (STOMP Component)

A password if authentication is to be used.

Syntax

• C#
• VB.NET

public string Password { get; set; }

Public Property Password As String

Default Value

""

Remarks

If this property is set when connecting, the component will send the password in the passcode header.

This property is not available at design time.

ReadyToSend Property (STOMP Component)

Indicates whether the component is ready to send data.

Syntax

• C#
• VB.NET

public bool ReadyToSend { get; }

Public ReadOnly Property ReadyToSend As Boolean

Default Value

False

Remarks

This property indicates that the underlying TCP/IP subsystem is ready to accept data. This is True after connecting to the remote host, and will become False if a call to SendData or SendMessage fails due to a WOULDBLOCK condition.

Once data can be sent again, the ReadyToSend event will fire and this property will be True.

If a WOULDBLOCK error occurs while sending a message the component will automatically complete the transmission when sending is possible. No action needs to be taken to re-send the message. ReadyToSend will fire after the component completes any partially sent messages.

This property is read-only and not available at design time.

RemoteHost Property (STOMP Component)

The address of the remote host. Domain names are resolved to IP addresses.

Syntax

• C#
• VB.NET

public string RemoteHost { get; set; }

Public Property RemoteHost As String

Default Value

""

Remarks

This property specifies the IP address (IP number in dotted internet format) or Domain Name of the remote host. It is set before a connection is attempted and cannot be changed once a connection is established.

If this property is set to a Domain Name, a DNS request is initiated, and upon successful termination of the request, this property is set to the corresponding address. If the search is not successful, an error is returned.

If the component is configured to use a SOCKS firewall, the value assigned to this property may be preceded with an "*". If this is the case, the host name is passed to the firewall unresolved and the firewall performs the DNS resolution.

By default the component will connect in plaintext. To enable SSL set SSLEnabled to True.

RemotePort Property (STOMP Component)

The port of the STOMP server (default is 61613). The default port for SSL is 61612.

Syntax

• C#
• VB.NET

public int RemotePort { get; set; }

Public Property RemotePort As Integer

Default Value

61613

Remarks

This property specifies a service port on the remote host to connect to.

A valid port number (a value between 1 and 65535) is required for the connection to take place. The property must be set before a connection is attempted and cannot be changed once a connection is established. Any attempt to change this property while connected will fail with an error.

This property is not available at design time.

RequestReceipts Property (STOMP Component)

Whether the component should request that the server provide message receipts.

Syntax

• C#
• VB.NET

public bool RequestReceipts { get; set; }

Public Property RequestReceipts As Boolean

Default Value

False

Remarks

This property is used to specify whether the component should request that the server send back confirmations (known as a "receipts" in STOMP terminology) when it receives messages from the component. This is done by adding a receipt header to the outgoing frame.

When this property is set to True, and a message is sent, the ReceiptOut event will fire immediately after the MessageOut event fires.

Note that, while this property only controls receipt requests for outgoing messages, the component is capable of requesting receipts for any outgoing frame type. Use this table to determine which API members control receipt request for each outgoing frame type (all are False by default):

Received Receipt Notes

When a receipt is received, the ReceiptIn event fires.

Note that receipts are cumulative, and a STOMP server is not required to send back discrete receipts for each frame it receives that has a receipt header. For example, if the component has sent four message frames with the following receipt header values (in chronological order):

1. SEND-3
2. SEND-4
3. SEND-5
4. SEND-6

This property is not available at design time.

SSLAcceptServerCert Property (STOMP Component)

Instructs the component to unconditionally accept the server certificate that matches the supplied certificate.

Syntax

• C#
• VB.NET

public Certificate SSLAcceptServerCert { get; set; }

Public Property SSLAcceptServerCert As Certificate

Remarks

If it finds any issues with the certificate presented by the server, the component will normally terminate the connection with an error.

You may override this behavior by supplying a value for SSLAcceptServerCert. If the certificate supplied in SSLAcceptServerCert is the same as the certificate presented by the server, then the server certificate is accepted unconditionally, and the connection will continue normally.

Please note that this functionality is provided only for cases where you otherwise know that you are communicating with the right server. If used improperly, this property may create a security breach. Use it at your own risk.

SSLCert Property (STOMP Component)

The certificate to be used during SSL negotiation.

Syntax

• C#
• VB.NET

public Certificate SSLCert { get; set; }

Public Property SSLCert As Certificate

Remarks

The digital certificate that the component will use during SSL negotiation. Set this property to a valid certificate before starting SSL negotiation. To set a certificate, you may set the Encoded field to the encoded certificate. To select a certificate, use the store and subject fields.

SSLEnabled Property (STOMP Component)

Whether TLS/SSL is enabled.

Syntax

• C#
• VB.NET

public bool SSLEnabled { get; set; }

Public Property SSLEnabled As Boolean

Default Value

False

Remarks

This setting specifies whether TLS/SSL is enabled in the component. When False (default) the component operates in plaintext mode. When True TLS/SSL is enabled.

TLS/SSL may also be enabled by setting SSLStartMode. Setting SSLStartMode will automatically update this property value.

This property is not available at design time.

SSLProvider Property (STOMP Component)

This specifies the SSL/TLS implementation to use.

Syntax

• C#
• VB.NET

public StompSSLProviders SSLProvider { get; set; }

enum StompSSLProviders {
  sslpAutomatic,
  sslpPlatform,
  sslpInternal
}

Public Property SSLProvider As StompSSLProviders

Enum StompSSLProviders
  sslpAutomatic
  sslpPlatform
  sslpInternal
End Enum

Default Value

0

Remarks

This property specifies the SSL/TLS implementation to use. In most cases the default value of 0 (Automatic) is recommended and should not be changed. When set to 0 (Automatic) the component will select whether to use the platform implementation or the internal implementation depending on the operating system as well as the TLS version being used.

Possible values are:

In most cases using the default value (Automatic) is recommended. The component will select a provider depending on the current platform.

When Automatic is selected, on Windows the component will use the platform implementation. On Linux/macOS the component will use the internal implementation. When TLS 1.3 is enabled via SSLEnabledProtocols the internal implementation is used on all platforms.

The .NET Standard library will always use the internal implementation on all platforms.

SSLServerCert Property (STOMP Component)

The server certificate for the last established connection.

Syntax

• C#
• VB.NET

public Certificate SSLServerCert { get; }

Public ReadOnly Property SSLServerCert As Certificate

Remarks

SSLServerCert contains the server certificate for the last established connection.

SSLServerCert is reset every time a new connection is attempted.

This property is read-only.

Subscriptions Property (STOMP Component)

Collection of current subscriptions.

Syntax

• C#
• VB.NET

public STOMPSubscriptionList Subscriptions { get; }

Public ReadOnly Property Subscriptions As STOMPSubscriptionList

Remarks

This property holds a collection of STOMPSubscription items representing the component's current subscriptions.

This property is read-only and not available at design time.

Timeout Property (STOMP Component)

A timeout for the component.

Syntax

• C#
• VB.NET

public int Timeout { get; set; }

Public Property Timeout As Integer

Default Value

60

Remarks

This property defines the timeout when sending data. When SSLEnabled is False a value of 0 means data will be sent asynchronously and a positive value means data is sent synchronously. When SSLEnabled is True all data is sent synchronously regardless of the Timeout value. Please see the notes below for details.

Plaintext

If the Timeout property is set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data cannot be sent immediately.

If Timeout is set to a positive value, data is sent in a blocking manner and the component will wait for the operation to complete before returning control. The component will handle any potential WOULDBLOCK errors internally and automatically retry the operation for a maximum of Timeout seconds.

SSL

If the Timeout property is set to 0, all operations will run uninterrupted until successful completion or an error condition is encountered.

If Timeout is set to a positive value, the component will wait for the operation to complete before returning control.

Additional Notes

The component will use DoEvents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not "freeze" and remains responsive.

If Timeout expires, and the operation is not yet complete, the component throws an exception.

Please note that by default, all timeouts are inactivity timeouts, i.e. the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received.

The default value for the Timeout property is 60 seconds.

TransactionId Property (STOMP Component)

Specifies the Id of the transaction that outgoing messages are associated with.

Syntax

• C#
• VB.NET

public string TransactionId { get; set; }

Public Property TransactionId As String

Default Value

""

Remarks

This property, if not empty, is used to specify which transaction outgoing messages sent using SendMessage or SendData are associated with.

This property must either be empty, or set to the Id of a currently open transaction. The OpenTransactions configuration setting can be queried at any time to retrieve a comma-separated list of currently open transactions' Ids.

Note that this property only affects outgoing messages. It is also possible to send a message acknowledgment as part of a transaction by setting the AckTransactionId configuration setting during the MessageIn event handler.

Refer to BeginTransaction for more information about transactions.

This property is not available at design time.

User Property (STOMP Component)

A username if authentication is to be used.

Syntax

• C#
• VB.NET

public string User { get; set; }

Public Property User As String

Default Value

""

Remarks

If this property is set when connecting, the component will send the user in the login header.

This property is not available at design time.

AbortTransaction Method (STOMP Component)

Aborts an existing transaction.

Syntax

• C#
• VB.NET

public void AbortTransaction(string id);

Async Version
public async Task AbortTransaction(string id);
public async Task AbortTransaction(string id, CancellationToken cancellationToken);

Public Sub AbortTransaction(ByVal Id As String)

Async Version
Public Sub AbortTransaction(ByVal Id As String) As Task
Public Sub AbortTransaction(ByVal Id As String, cancellationToken As CancellationToken) As Task

Remarks

This method aborts a transaction previously started with BeginTransaction. Id identifies the transaction to abort.

The OpenTransactions configuration setting can be queried to obtain a list of currently-open transactions.

Refer to BeginTransaction for more information about transactions.

AddHeader Method (STOMP Component)

Adds a custom header to send with outgoing messages.

Syntax

• C#
• VB.NET

public void AddHeader(string key, string value);

Async Version
public async Task AddHeader(string key, string value);
public async Task AddHeader(string key, string value, CancellationToken cancellationToken);

Public Sub AddHeader(ByVal Key As String, ByVal Value As String)

Async Version
Public Sub AddHeader(ByVal Key As String, ByVal Value As String) As Task
Public Sub AddHeader(ByVal Key As String, ByVal Value As String, cancellationToken As CancellationToken) As Task

Remarks

This method is used to add user-defined headers to the list of headers held by the Headers collection property.

When SendMessage or SendData is called, all headers in the Headers collection property are added to the outgoing message.

Note that the STOMP specification defines a number of standard headers necessary for implementing the STOMP protocol. When constructing an outgoing message, the component silently ignores any user-defined headers that are already set by the component.

BeginTransaction Method (STOMP Component)

Begins a new transaction.

Syntax

• C#
• VB.NET

public void BeginTransaction(string id);

Async Version
public async Task BeginTransaction(string id);
public async Task BeginTransaction(string id, CancellationToken cancellationToken);

Public Sub BeginTransaction(ByVal Id As String)

Async Version
Public Sub BeginTransaction(ByVal Id As String) As Task
Public Sub BeginTransaction(ByVal Id As String, cancellationToken As CancellationToken) As Task

Remarks

This method begins a new transaction using the specified Id, which must be unique. There is no limit to how many transactions may be open at any given time.

A transaction is a group of messages and message acknowledgments which are all processed atomically when the transaction is committed or aborted.

Messages sent in a transaction will not be delivered to clients subscribed to the messages' destinations until the transaction is committed.

Since it is possible for multiple transactions to be open at any given time, the TransactionId property is used to specify which transaction (if any) messages should be sent in. Similarly, message acknowledgments can be sent in a transaction by setting the AckTransactionId configuration setting during the MessageIn event handler.

The OpenTransactions configuration setting can be queried at any time to retrieve a comma-separated list of currently open transactions' Ids.

Basic Transaction Example // Open a new transaction. stomp1.BeginTransaction("txn1"); // Set the Transaction property to make sure that messages are sent as part of the transaction. stomp1.Transaction = "txn1"; stomp1.SendMessage("test/a/b", "Hello, world!"); stomp1.SendMessage("test/a/b", "This is a test."); stomp1.SendMessage("test/a/b", "Another test!"); // At this point, none of the messages sent above would have been delivered to any clients // subscribed to the "test/a/b" destination yet, because the transaction is still open. // If we close and commit the transaction, the server will then deliver the messages to subscribers, // queue them, or process them in another manner; the behavior is server-dependent. stomp1.CommitTransaction("txn1"); // Or, the transaction can be aborted, in which case the server will discard the messages // without delivering them to the subscribers. //stomp1.AbortTransaction("txn1"); // Reset (or change) the Transaction property after committing or aborting a transaction // so that future messages are not associated with the previous transaction. stomp1.Transaction = "";

CommitTransaction Method (STOMP Component)

Commits an existing transaction.

Syntax

• C#
• VB.NET

public void CommitTransaction(string id);

Async Version
public async Task CommitTransaction(string id);
public async Task CommitTransaction(string id, CancellationToken cancellationToken);

Public Sub CommitTransaction(ByVal Id As String)

Async Version
Public Sub CommitTransaction(ByVal Id As String) As Task
Public Sub CommitTransaction(ByVal Id As String, cancellationToken As CancellationToken) As Task

Remarks

This method commits a transaction previously started with BeginTransaction. Id identifies the transaction to commit.

The OpenTransactions configuration setting can be queried to obtain a list of currently-open transactions.

Refer to BeginTransaction for more information about transactions.

Config Method (STOMP Component)

Sets or retrieves a configuration setting.

Syntax

• C#
• VB.NET

public string Config(string configurationString);

Async Version
public async Task<string> Config(string configurationString);
public async Task<string> Config(string configurationString, CancellationToken cancellationToken);

Public Function Config(ByVal ConfigurationString As String) As String

Async Version
Public Function Config(ByVal ConfigurationString As String) As Task(Of String)
Public Function Config(ByVal ConfigurationString As String, cancellationToken As CancellationToken) As Task(Of String)

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

Connect Method (STOMP Component)

Connects to the remote host.

Syntax

• C#
• VB.NET

public void Connect();

Async Version
public async Task Connect();
public async Task Connect(CancellationToken cancellationToken);

Public Sub Connect()

Async Version
Public Sub Connect() As Task
Public Sub Connect(cancellationToken As CancellationToken) As Task

Remarks

This method connects to the remote host, specified by RemoteHost and RemotePort. Calling this method is equivalent to setting the Connected property to True.

By default the component will connect in plaintext. To enable SSL set SSLEnabled to True.

When connecting to a STOMP server, the component sends information from the following properties, if populated:

• IncomingHeartbeat
• OutgoingHeartbeat
• User
• Password

In addition to the above properties, the following configuration settings can be set before connecting (though in most cases this is not necessary):

• SupportedVersions: Controls which STOMP versions the component advertises support for.
• VirtualHost: Controls the virtual host to connect to. If left empty (default), the value from RemoteHost is used.

ConnectTo Method (STOMP Component)

Connects to the remote host.

Syntax

• C#
• VB.NET

public void ConnectTo(string host, int port);

Async Version
public async Task ConnectTo(string host, int port);
public async Task ConnectTo(string host, int port, CancellationToken cancellationToken);

Public Sub ConnectTo(ByVal Host As String, ByVal Port As Integer)

Async Version
Public Sub ConnectTo(ByVal Host As String, ByVal Port As Integer) As Task
Public Sub ConnectTo(ByVal Host As String, ByVal Port As Integer, cancellationToken As CancellationToken) As Task

Remarks

This method connects to the remote host specified by the Host and Port parameters. Calling this method is equivalent to setting the RemoteHost property to Host, setting RemotePort to Port, and then setting the Connected property to True.

By default the component will connect in plaintext. To enable SSL set SSLEnabled to True.

When connecting to a STOMP server, the component sends information from the following properties, if populated:

• IncomingHeartbeat
• OutgoingHeartbeat
• User
• Password

In addition to the above properties, the following configuration settings can be set before connecting (though in most cases this is not necessary):

• SupportedVersions: Controls which STOMP versions the component advertises support for.
• VirtualHost: Controls the virtual host to connect to. If left empty (default), the value from RemoteHost is used.

Disconnect Method (STOMP Component)

This method disconnects from the remote host.

Syntax

• C#
• VB.NET

public void Disconnect();

Async Version
public async Task Disconnect();
public async Task Disconnect(CancellationToken cancellationToken);

Public Sub Disconnect()

Async Version
Public Sub Disconnect() As Task
Public Sub Disconnect(cancellationToken As CancellationToken) As Task

Remarks

This method disconnects from the remote host. Calling this method is equivalent to setting the Connected property to False.

DoEvents Method (STOMP Component)

Processes events from the internal message queue.

Syntax

• C#
• VB.NET

public void DoEvents();

Async Version
public async Task DoEvents();
public async Task DoEvents(CancellationToken cancellationToken);

Public Sub DoEvents()

Async Version
Public Sub DoEvents() As Task
Public Sub DoEvents(cancellationToken As CancellationToken) As Task

Remarks

When DoEvents is called, the component processes any available events. If no events are available, it waits for a preset period of time, and then returns.

Interrupt Method (STOMP Component)

Interrupt the current action and disconnects from the remote host.

Syntax

• C#
• VB.NET

public void Interrupt();

Async Version
public async Task Interrupt();
public async Task Interrupt(CancellationToken cancellationToken);

Public Sub Interrupt()

Async Version
Public Sub Interrupt() As Task
Public Sub Interrupt(cancellationToken As CancellationToken) As Task

Remarks

This method will interrupt the current method (if applicable) and cause the component to disconnect from the remote host.

Reset Method (STOMP Component)

Reset the component.

Syntax

• C#
• VB.NET

public void Reset();

Async Version
public async Task Reset();
public async Task Reset(CancellationToken cancellationToken);

Public Sub Reset()

Async Version
Public Sub Reset() As Task
Public Sub Reset(cancellationToken As CancellationToken) As Task

Remarks

This method will reset the component's properties to their default values.

ResetHeaders Method (STOMP Component)

Clear the user-defined headers collection.

Syntax

• C#
• VB.NET

public void ResetHeaders();

Async Version
public async Task ResetHeaders();
public async Task ResetHeaders(CancellationToken cancellationToken);

Public Sub ResetHeaders()

Async Version
Public Sub ResetHeaders() As Task
Public Sub ResetHeaders(cancellationToken As CancellationToken) As Task

Remarks

This method clears the Headers collection property.

SendData Method (STOMP Component)

Publishes a message with a raw data payload.

Syntax

• C#
• VB.NET

public void SendData(string destination, byte[] data);

Async Version
public async Task SendData(string destination, byte[] data);
public async Task SendData(string destination, byte[] data, CancellationToken cancellationToken);

Public Sub SendData(ByVal Destination As String, ByVal Data As String)

Async Version
Public Sub SendData(ByVal Destination As String, ByVal Data As String) As Task
Public Sub SendData(ByVal Destination As String, ByVal Data As String, cancellationToken As CancellationToken) As Task

Remarks

This method publishes a STOMP message with a raw data payload to the specified Destination. The MessageOut event will fire after the message has been sent.

The STOMP specification does not place any restrictions on Destination names. Instead, each STOMP server is free to define its own requirements for, and/or interpretations of, a Destination name; for example, a server might prohibit certain characters, require a specific format, or interpret some patterns in a special manner. Be sure to consult the documentation for your STOMP server to determine how to build proper Destination names.

In addition to the payload, the outgoing messages will include:

• All user-defined headers held by the Headers collection property.
• If the TransactionId property is populated, the transaction Id that it specifies (which associates the message with that transaction).

If RequestReceipts is enabled when this method is called, the component will request that the server send back a receipt to confirm it has received the message. Refer to RequestReceipts for more information.

Note that no content type is defined for raw data payload messages; so the ContentType property is ignored by this method.

Send String Message Example stomp1.SendMessage("test/a/b", "Hello, world!");

Send Binary Message Example byte[] fileContent = File.ReadAllBytes("C:\test\stuff.dat"); stomp1.SendData("test/a/b", fileContent);

SendMessage Method (STOMP Component)

Publishes a message with a string payload.

Syntax

• C#
• VB.NET

public void SendMessage(string destination, string message);

Async Version
public async Task SendMessage(string destination, string message);
public async Task SendMessage(string destination, string message, CancellationToken cancellationToken);

Public Sub SendMessage(ByVal Destination As String, ByVal Message As String)

Async Version
Public Sub SendMessage(ByVal Destination As String, ByVal Message As String) As Task
Public Sub SendMessage(ByVal Destination As String, ByVal Message As String, cancellationToken As CancellationToken) As Task

Remarks

This method publishes a STOMP message with a string payload to the specified Destination. The MessageOut event will fire after the message has been sent.

The ContentType property can be used to specify the content type of the payload. By default, ContentType is set to text/plain.

The STOMP specification does not place any restrictions on Destination names. Instead, each STOMP server is free to define its own requirements for, and/or interpretations of, a Destination name; for example, a server might prohibit certain characters, require a specific format, or interpret some patterns in a special manner. Be sure to consult the documentation for your STOMP server to determine how to build proper Destination names.

In addition to the payload, the outgoing messages will include:

• All user-defined headers held by the Headers collection property.
• If the TransactionId property is populated, the transaction Id that it specifies (which associates the message with that transaction).

If RequestReceipts is enabled when this method is called, the component will request that the server send back a receipt to confirm it has received the message. Refer to RequestReceipts for more information.

Send String Message Example stomp1.SendMessage("test/a/b", "Hello, world!");

Send Binary Message Example byte[] fileContent = File.ReadAllBytes("C:\test\stuff.dat"); stomp1.SendData("test/a/b", fileContent);

Subscribe Method (STOMP Component)

Subscribes to a message destination on the server.

Syntax

• C#
• VB.NET

public string Subscribe(string destination, bool requireAcks);

Async Version
public async Task<string> Subscribe(string destination, bool requireAcks);
public async Task<string> Subscribe(string destination, bool requireAcks, CancellationToken cancellationToken);

Public Function Subscribe(ByVal Destination As String, ByVal RequireAcks As Boolean) As String

Async Version
Public Function Subscribe(ByVal Destination As String, ByVal RequireAcks As Boolean) As Task(Of String)
Public Function Subscribe(ByVal Destination As String, ByVal RequireAcks As Boolean, cancellationToken As CancellationToken) As Task(Of String)

Remarks

This method is used to subscribe to the specified message Destination on the server. The Id of the subscription is returned.

Once subscribed, the Subscribed event will fire and an item will be added to the Subscriptions collection property. The MessageIn event will fire anytime a message is received for any subscription.

The STOMP specification does not place any restrictions on Destination names. Instead, each STOMP server is free to define its own requirements for, and/or interpretations of, a Destination name; for example, a server might prohibit certain characters, require a specific format, or interpret some patterns in a special manner. Be sure to consult the documentation for your STOMP server to determine how to build proper Destination names.

If the RequireAcks parameter is set to True, the server will expect the component to send it a message acknowledgment for each message it delivers as part of this subscription. (Refer to the MessageIn event for more information about sending message acknowledgments).

Basic Subscriptions Example stomp1.OnMessageIn += (s, e) => { Console.WriteLine("Received message from destination '" + e.Destination + "':"); Console.WriteLine(e.Data); }; string subId = stomp1.Subscribe("test/a/b", false); // Some time later... stomp1.Unsubscribe(subId);

Unsubscribe Method (STOMP Component)

Removes an existing subscription.

Syntax

• C#
• VB.NET

public void Unsubscribe(string id);

Async Version
public async Task Unsubscribe(string id);
public async Task Unsubscribe(string id, CancellationToken cancellationToken);

Public Sub Unsubscribe(ByVal Id As String)

Async Version
Public Sub Unsubscribe(ByVal Id As String) As Task
Public Sub Unsubscribe(ByVal Id As String, cancellationToken As CancellationToken) As Task

Remarks

This method removes an existing subscription identified by the given Id, unsubscribing the component from the destination associated with the subscription.

Once unsubscribed, the relevant item will be removed from the Subscriptions collection property and the Unsubscribed event will fire.

Basic Subscriptions Example stomp1.OnMessageIn += (s, e) => { Console.WriteLine("Received message from destination '" + e.Destination + "':"); Console.WriteLine(e.Data); }; string subId = stomp1.Subscribe("test/a/b", false); // Some time later... stomp1.Unsubscribe(subId);

Connected Event (STOMP Component)

This event is fired immediately after a connection completes (or fails).

Syntax

• C#
• VB.NET

public event OnConnectedHandler OnConnected;

public delegate void OnConnectedHandler(object sender, StompConnectedEventArgs e);

public class StompConnectedEventArgs : EventArgs {
  public int StatusCode { get; }
  public string Description { get; }
}

Public Event OnConnected As OnConnectedHandler

Public Delegate Sub OnConnectedHandler(sender As Object, e As StompConnectedEventArgs)

Public Class StompConnectedEventArgs Inherits EventArgs
  Public ReadOnly Property StatusCode As Integer
  Public ReadOnly Property Description As String
End Class

Remarks

If the connection is made normally, StatusCode is 0 and Description is "OK".

If the connection fails, StatusCode has the error code returned by the Transmission Control Protocol (TCP)/IP stack. Description contains a description of this code. The value of StatusCode is equal to the value of the error.

Please refer to the Error Codes section for more information.

ConnectionStatus Event (STOMP Component)

This event is fired to indicate changes in the connection state.

Syntax

• C#
• VB.NET

public event OnConnectionStatusHandler OnConnectionStatus;

public delegate void OnConnectionStatusHandler(object sender, StompConnectionStatusEventArgs e);

public class StompConnectionStatusEventArgs : EventArgs {
  public string ConnectionEvent { get; }
  public int StatusCode { get; }
  public string Description { get; }
}

Public Event OnConnectionStatus As OnConnectionStatusHandler

Public Delegate Sub OnConnectionStatusHandler(sender As Object, e As StompConnectionStatusEventArgs)

Public Class StompConnectionStatusEventArgs Inherits EventArgs
  Public ReadOnly Property ConnectionEvent As String
  Public ReadOnly Property StatusCode As Integer
  Public ReadOnly Property Description As String
End Class

Remarks

The ConnectionStatus event is fired when the connection state changes: for example, completion of a firewall or proxy connection or completion of a security handshake.

The ConnectionEvent parameter indicates the type of connection event. Values may include the following:

Disconnected Event (STOMP Component)

This event is fired when a connection is closed.

Syntax

• C#
• VB.NET

public event OnDisconnectedHandler OnDisconnected;

public delegate void OnDisconnectedHandler(object sender, StompDisconnectedEventArgs e);

public class StompDisconnectedEventArgs : EventArgs {
  public int StatusCode { get; }
  public string Description { get; }
}

Public Event OnDisconnected As OnDisconnectedHandler

Public Delegate Sub OnDisconnectedHandler(sender As Object, e As StompDisconnectedEventArgs)

Public Class StompDisconnectedEventArgs Inherits EventArgs
  Public ReadOnly Property StatusCode As Integer
  Public ReadOnly Property Description As String
End Class

Remarks

If the connection is broken normally, StatusCode is 0 and Description is "OK".

If the connection is broken for any other reason, StatusCode has the error code returned by the Transmission Control Protocol (TCP/IP) subsystem. Description contains a description of this code. The value of StatusCode is equal to the value of the TCP/IP error.

Please refer to the Error Codes section for more information.

Error Event (STOMP Component)

Fired when a component or protocol error occurs.

Syntax

• C#
• VB.NET

public event OnErrorHandler OnError;

public delegate void OnErrorHandler(object sender, StompErrorEventArgs e);

public class StompErrorEventArgs : EventArgs {
  public int ErrorCode { get; }
  public string Description { get; }
  public string Data { get; }
  public byte[] DataB { get; }
}

Public Event OnError As OnErrorHandler

Public Delegate Sub OnErrorHandler(sender As Object, e As StompErrorEventArgs)

Public Class StompErrorEventArgs Inherits EventArgs
  Public ReadOnly Property ErrorCode As Integer
  Public ReadOnly Property Description As String
  Public ReadOnly Property Data As String
  Public ReadOnly Property DataB As Byte()
End Class

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the component throws an exception.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

STOMP Protocol Errors

When this occurs, ErrorCode will be 600, Description will reflect the value of the ERROR frame's message header, and Data will contain the body of the ERROR frame (if one is present).

The ErrorHeaders configuration setting will also be populated with the raw headers from the ERROR frame for the duration of the Error event handler.

Log Event (STOMP Component)

Fired once for each log message.

Syntax

• C#
• VB.NET

public event OnLogHandler OnLog;

public delegate void OnLogHandler(object sender, StompLogEventArgs e);

public class StompLogEventArgs : EventArgs {
  public int LogLevel { get; }
  public string Message { get; }
  public string LogType { get; }
}

Public Event OnLog As OnLogHandler

Public Delegate Sub OnLogHandler(sender As Object, e As StompLogEventArgs)

Public Class StompLogEventArgs Inherits EventArgs
  Public ReadOnly Property LogLevel As Integer
  Public ReadOnly Property Message As String
  Public ReadOnly Property LogType As String
End Class

Remarks

This event fires once for each log message generated by the component. The verbosity is controlled by the LogLevel setting.

LogLevel indicates the level of the Message. Possible values are:

LogType identifies the type of log entry. Possible values are:

• Info: General information about the component.
• Acknowledgment: Information about outgoing message acknowledgments.
• Frame: Frame content logging.

MessageIn Event (STOMP Component)

Fired when a message has been received.

Syntax

• C#
• VB.NET

public event OnMessageInHandler OnMessageIn;

public delegate void OnMessageInHandler(object sender, StompMessageInEventArgs e);

public class StompMessageInEventArgs : EventArgs {
  public string MessageId { get; }
  public string SubscriptionId { get; }
  public string Destination { get; }
  public string Data { get; }
  public byte[] DataB { get; }
  public string ContentType { get; }
  public bool Ack { get; set; }
}

Public Event OnMessageIn As OnMessageInHandler

Public Delegate Sub OnMessageInHandler(sender As Object, e As StompMessageInEventArgs)

Public Class StompMessageInEventArgs Inherits EventArgs
  Public ReadOnly Property MessageId As String
  Public ReadOnly Property SubscriptionId As String
  Public ReadOnly Property Destination As String
  Public ReadOnly Property Data As String
  Public ReadOnly Property DataB As Byte()
  Public ReadOnly Property ContentType As String
  Public Property Ack As Boolean
End Class

Remarks

This events fires whenever the component has received a message.

In addition to the message details exposed by the event parameters, the ParsedHeaders collection property is populated with the headers parsed from the message. When the MessageIn event handler exits, the parsed headers are cleared. The following parameters are available within this event:

• MessageId: The unique Id of the message.
• SubscriptionId: The subscription Id the message is associated with.
• Destination: The message destination on the server which the message originated from.
• Data: The message's payload.
• ContentType: The content type of the message (may be empty).
• Ack: Set to True or False to control whether the component should send back a positive (True, default) or negative (False) message acknowledgment.

Message acknowledgments are only sent back to the server for messages which require them. A positive acknowledgment indicates that the message has been accepted, while a negative acknowledgment represents that the message has been rejected.

The following two configuration settings are also relevant in the context of sending back message acknowledgments for incoming messages:

• The AckTransactionId configuration setting, if not empty, specifies a transaction Id to associate the message acknowledgment with. It can only be set during the MessageIn event handler, and will be reset when the event handler ends.
• The RequestAckReceipts configuration setting controls whether the component will request that the server confirm receipt of the message acknowledgment. It is False by default, and can be set at any time.

MessageOut Event (STOMP Component)

Fired after a message has been sent.

Syntax

• C#
• VB.NET

public event OnMessageOutHandler OnMessageOut;

public delegate void OnMessageOutHandler(object sender, StompMessageOutEventArgs e);

public class StompMessageOutEventArgs : EventArgs {
  public string Destination { get; }
  public string Data { get; }
  public byte[] DataB { get; }
  public string ContentType { get; }
}

Public Event OnMessageOut As OnMessageOutHandler

Public Delegate Sub OnMessageOutHandler(sender As Object, e As StompMessageOutEventArgs)

Public Class StompMessageOutEventArgs Inherits EventArgs
  Public ReadOnly Property Destination As String
  Public ReadOnly Property Data As String
  Public ReadOnly Property DataB As Byte()
  Public ReadOnly Property ContentType As String
End Class

Remarks

This event fires after a message has been sent using either SendMessage or SendData. The following parameters are available within this event:

• Destination: The destination the message was sent to.
• Data: The message's payload.
• ContentType: The content type of the message (always empty for messages sent with SendData).

ReadyToSend Event (STOMP Component)

Fired when the component is ready to send data.

Syntax

• C#
• VB.NET

public event OnReadyToSendHandler OnReadyToSend;

public delegate void OnReadyToSendHandler(object sender, StompReadyToSendEventArgs e);

public class StompReadyToSendEventArgs : EventArgs {
}

Public Event OnReadyToSend As OnReadyToSendHandler

Public Delegate Sub OnReadyToSendHandler(sender As Object, e As StompReadyToSendEventArgs)

Public Class StompReadyToSendEventArgs Inherits EventArgs
End Class

Remarks

The ReadyToSend event indicates that the underlying TCP/IP subsystem is ready to accept data after a call to SendData or SendMessage fails due to a WOULDBLOCK condition. The event is also fired immediately after a connection to the remote host is established.

ReceiptIn Event (STOMP Component)

Fires when the component receives a receipt from the server.

Syntax

• C#
• VB.NET

public event OnReceiptInHandler OnReceiptIn;

public delegate void OnReceiptInHandler(object sender, StompReceiptInEventArgs e);

public class StompReceiptInEventArgs : EventArgs {
  public string ReceiptId { get; }
}

Public Event OnReceiptIn As OnReceiptInHandler

Public Delegate Sub OnReceiptInHandler(sender As Object, e As StompReceiptInEventArgs)

Public Class StompReceiptInEventArgs Inherits EventArgs
  Public ReadOnly Property ReceiptId As String
End Class

Remarks

This event fires anytime the component receives a receipt (that is, a confirmation that the server has received one or more frames) from the server. The ReceiptId parameter reflects the value of the receipt-id header in the incoming RECEIPT frame.

Note that receipts are cumulative, and a STOMP server is not required to send back discrete receipts for each frame it receives that has a receipt header. For example, if the component has sent four message frames with the following receipt header values (in chronological order):

1. SEND-3
2. SEND-4
3. SEND-5
4. SEND-6

Refer to RequestReceipts for more information about receipts.

ReceiptOut Event (STOMP Component)

Fires when the component sends a STOMP frame that includes a 'receipt' header.

Syntax

• C#
• VB.NET

public event OnReceiptOutHandler OnReceiptOut;

public delegate void OnReceiptOutHandler(object sender, StompReceiptOutEventArgs e);

public class StompReceiptOutEventArgs : EventArgs {
  public string ReceiptId { get; }
}

Public Event OnReceiptOut As OnReceiptOutHandler

Public Delegate Sub OnReceiptOutHandler(sender As Object, e As StompReceiptOutEventArgs)

Public Class StompReceiptOutEventArgs Inherits EventArgs
  Public ReadOnly Property ReceiptId As String
End Class

Remarks

This event fires anytime the component sends any STOMP frame that includes a receipt header on it. The ReceiptId parameter reflects the value of the receipt header.

Having a receipt header on an outgoing frame indicates to the server that it should send back a receipt to confirm that it has received the frame (though it is not required to do so immediately; see ReceiptIn for details). Anytime the server sends back a receipt, the ReceiptIn event will fire.

Refer to RequestReceipts for more information about receipts.

SSLServerAuthentication Event (STOMP Component)

Fired after the server presents its certificate to the client.

Syntax

• C#
• VB.NET

public event OnSSLServerAuthenticationHandler OnSSLServerAuthentication;

public delegate void OnSSLServerAuthenticationHandler(object sender, StompSSLServerAuthenticationEventArgs e);

public class StompSSLServerAuthenticationEventArgs : EventArgs {
  public string CertEncoded { get; }
  public byte[] CertEncodedB { get; }
  public string CertSubject { get; }
  public string CertIssuer { get; }
  public string Status { get; }
  public bool Accept { get; set; }
}

Public Event OnSSLServerAuthentication As OnSSLServerAuthenticationHandler

Public Delegate Sub OnSSLServerAuthenticationHandler(sender As Object, e As StompSSLServerAuthenticationEventArgs)

Public Class StompSSLServerAuthenticationEventArgs Inherits EventArgs
  Public ReadOnly Property CertEncoded As String
  Public ReadOnly Property CertEncodedB As Byte()
  Public ReadOnly Property CertSubject As String
  Public ReadOnly Property CertIssuer As String
  Public ReadOnly Property Status As String
  Public Property Accept As Boolean
End Class

Remarks

During this event, the client can decide whether or not to continue with the connection process. The Accept parameter is a recommendation on whether to continue or close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue.

When Accept is False, Status shows why the verification failed (otherwise, Status contains the string OK). If it is decided to continue, you can override and accept the certificate by setting the Accept parameter to True.

SSLStatus Event (STOMP Component)

Fired when secure connection progress messages are available.

Syntax

• C#
• VB.NET

public event OnSSLStatusHandler OnSSLStatus;

public delegate void OnSSLStatusHandler(object sender, StompSSLStatusEventArgs e);

public class StompSSLStatusEventArgs : EventArgs {
  public string Message { get; }
}

Public Event OnSSLStatus As OnSSLStatusHandler

Public Delegate Sub OnSSLStatusHandler(sender As Object, e As StompSSLStatusEventArgs)

Public Class StompSSLStatusEventArgs Inherits EventArgs
  Public ReadOnly Property Message As String
End Class

Remarks

The event is fired for informational and logging purposes only. This event tracks the progress of the connection.

Subscribed Event (STOMP Component)

Fired when the component has subscribed to a message destination on the server.

Syntax

• C#
• VB.NET

public event OnSubscribedHandler OnSubscribed;

public delegate void OnSubscribedHandler(object sender, StompSubscribedEventArgs e);

public class StompSubscribedEventArgs : EventArgs {
  public string Id { get; }
  public string Destination { get; }
  public bool RequireAcks { get; }
}

Public Event OnSubscribed As OnSubscribedHandler

Public Delegate Sub OnSubscribedHandler(sender As Object, e As StompSubscribedEventArgs)

Public Class StompSubscribedEventArgs Inherits EventArgs
  Public ReadOnly Property Id As String
  Public ReadOnly Property Destination As String
  Public ReadOnly Property RequireAcks As Boolean
End Class

Remarks

This event fires each time the component has subscribed to a message destination on the server. The following parameters are available within this event:

• Id: The Id used to identify the subscription.
• Destination: The message destination on the server which the subscription is associated with.
• RequireAcks: Whether messages the component receives as a result of the subscription will require acknowledgments to be sent back to the server.

Unsubscribed Event (STOMP Component)

Fired when the component has unsubscribed from a message destination on the server.

Syntax

• C#
• VB.NET

public event OnUnsubscribedHandler OnUnsubscribed;

public delegate void OnUnsubscribedHandler(object sender, StompUnsubscribedEventArgs e);

public class StompUnsubscribedEventArgs : EventArgs {
  public string Id { get; }
  public string Destination { get; }
}

Public Event OnUnsubscribed As OnUnsubscribedHandler

Public Delegate Sub OnUnsubscribedHandler(sender As Object, e As StompUnsubscribedEventArgs)

Public Class StompUnsubscribedEventArgs Inherits EventArgs
  Public ReadOnly Property Id As String
  Public ReadOnly Property Destination As String
End Class

Remarks

This event fires each time the component has unsubscribed from a message destination on the server. The following parameters are available within this event:

• Id: The Id that was used to identify the subscription.
• Destination: The message destination on the server which the subscription was associated with.

Certificate Type

This is the digital certificate being used.

Remarks

This type describes the current digital certificate. The certificate may be a public or private key. The fields are used to identify or select certificates.

Fields

Constructors

• C#
• VB.NET

public Certificate();

Public Certificate()

Creates a Certificate instance whose properties can be set. This is useful for use with CERTMGR when generating new certificates.

• C#
• VB.NET

public Certificate(string certificateFile);

Public Certificate(ByVal CertificateFile As String)

Opens CertificateFile and reads out the contents as an X.509 public key.

• C#
• VB.NET

public Certificate(byte[] certificateData);

Public Certificate(ByVal CertificateData As Byte())

Parses CertificateData as an X.509 public key.

• C#
• VB.NET

public Certificate(CertStoreTypes certStoreType, string store, string storePassword, string subject);

Public Certificate(ByVal CertStoreType As CertStoreTypes, ByVal Store As String, ByVal StorePassword As String, ByVal Subject As String)

CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a file containing the certificate store. StorePassword is the password used to protect the store. After the store has been successfully opened, the component will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN).

• C#
• VB.NET

public Certificate(CertStoreTypes certStoreType, string store, string storePassword, string subject, string configurationString);

Public Certificate(ByVal CertStoreType As CertStoreTypes, ByVal Store As String, ByVal StorePassword As String, ByVal Subject As String, ByVal ConfigurationString As String)

CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a file containing the certificate store. StorePassword is the password used to protect the store. ConfigurationString is a newline separated list of name-value pairs that may be used to modify the default behavior. Possible values include "PersistPFXKey", which shows whether or not the PFX key is persisted after performing operations with the private key. This correlates to the PKCS12_NO_PERSIST_KEY CryptoAPI option. The default value is True (the key is persisted). "Thumbprint" - an MD5, SHA-1, or SHA-256 thumbprint of the certificate to load. When specified, this value is used to select the certificate in the store. This is applicable to cstUser, cstMachine, cstPublicKeyFile, and cstPFXFile store types. "UseInternalSecurityAPI" shows whether the platform (default) or the internal security API is used when performing certificate-related operations. After the store has been successfully opened, the component will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN).

• C#
• VB.NET

public Certificate(CertStoreTypes certStoreType, string store, string storePassword, byte[] encoded);

Public Certificate(ByVal CertStoreType As CertStoreTypes, ByVal Store As String, ByVal StorePassword As String, ByVal Encoded As Byte())

CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a file containing the certificate store. StorePassword is the password used to protect the store. After the store has been successfully opened, the component will load Encoded as an X.509 certificate and search the opened store for a corresponding private key.

• C#
• VB.NET

public Certificate(CertStoreTypes certStoreType, byte[] storeBlob, string storePassword, string subject);

Public Certificate(ByVal CertStoreType As CertStoreTypes, ByVal StoreBlob As Byte(), ByVal StorePassword As String, ByVal Subject As String)

CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. StoreBlob is a string (binary- or Base64-encoded) containing the certificate data. StorePassword is the password used to protect the store. After the store has been successfully opened, the component will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN).

• C#
• VB.NET

public Certificate(CertStoreTypes certStoreType, byte[] storeBlob, string storePassword, string subject, string configurationString);

Public Certificate(ByVal CertStoreType As CertStoreTypes, ByVal StoreBlob As Byte(), ByVal StorePassword As String, ByVal Subject As String, ByVal ConfigurationString As String)

CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. StoreBlob is a string (binary- or Base64-encoded) containing the certificate data. StorePassword is the password used to protect the store. After the store has been successfully opened, the component will attempt to find the certificate identified by Subject . This can be either a complete or a substring match of the X.509 certificate's subject Distinguished Name (DN).

• C#
• VB.NET

public Certificate(CertStoreTypes certStoreType, byte[] storeBlob, string storePassword, byte[] encoded);

Public Certificate(ByVal CertStoreType As CertStoreTypes, ByVal StoreBlob As Byte(), ByVal StorePassword As String, ByVal Encoded As Byte())

CertStoreType identifies the type of certificate store to use. See StoreType for descriptions of the different certificate stores. Store is a string (binary- or Base64-encoded) containing the certificate store. StorePassword is the password used to protect the store. After the store has been successfully opened, the component will load Encoded as an X.509 certificate and search the opened store for a corresponding private key.

Firewall Type

The firewall the component will connect through.

Remarks

When connecting through a firewall, this type is used to specify different properties of the firewall, such as the firewall Host and the FirewallType.

Fields

Constructors

• C#
• VB.NET

public Firewall();

Public Firewall()

STOMPHeader Type

A STOMP header.

Remarks

This type represents a STOMP header.

Fields

Constructors

• C#
• VB.NET

public STOMPHeader();

Public STOMPHeader()

• C#
• VB.NET

public STOMPHeader(string key, string value);

Public STOMPHeader(ByVal Key As String, ByVal Value As String)

STOMPSubscription Type

A STOMP subscription.

Remarks

This type represents a STOMP subscription.

Fields

Config Settings (STOMP Component)

STOMP Config Settings

TCPClient Config Settings

SSL Config Settings

-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
..
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
..
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----

Socket Config Settings

Trappable Errors (STOMP Component)

STOMP Errors

TCPClient Errors

SSL Errors

TCP/IP Errors