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(PowerBuilder) Azure Service Bus - Peek-Lock Message (Non-Destructive Read)

See more Azure Service Bus Examples

Shows how to atomically retrieve and lock a message from a queue or subscription for processing. The message is guaranteed not to be delivered to other receivers (on the same queue or subscription only) during the lock duration specified in the queue/subscription description.

For more information, see https://docs.microsoft.com/en-us/rest/api/servicebus/peek-lock-message-non-destructive-read

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Rest
integer li_BAutoReconnect
integer li_Success
oleobject loo_SbToken
string ls_TopicName
string ls_SubscriptionName
oleobject loo_SbPath
oleobject loo_SbQueuePath
oleobject loo_SbResponseBody
oleobject loo_JsonBrokerProps
string ls_Message

// Note: Requires Chilkat v9.5.0.65 or greater.

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Make the initial connection.
// A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
loo_Rest = create oleobject
li_rc = loo_Rest.ConnectToNewObject("Chilkat_9_5_0.Rest")
if li_rc < 0 then
    destroy loo_Rest
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_BAutoReconnect = 1
li_Success = loo_Rest.Connect("<yournamespace>.servicebus.windows.net",443,1,li_BAutoReconnect)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    return
end if

// ----------------------------------------------------------------------------------------------
// The code above this comment could be placed inside a function/subroutine within the application
// because the connection does not need to be made for every request.  Once the connection is made
// the app may send many requests..
// ----------------------------------------------------------------------------------------------

// Let's load a previously computed SAS token and use it.
// See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
loo_SbToken = create oleobject
li_rc = loo_SbToken.ConnectToNewObject("Chilkat_9_5_0.StringBuilder")

loo_SbToken.LoadFile("qa_data/tokens/serviceBusSas.txt","utf-8")

// Tell the REST object to use the Azure Shared Access Signature for authorization.
loo_SbToken.Prepend("SharedAccessSignature ")
loo_Rest.AddHeader("Authorization",loo_SbToken.GetAsString())

// ----------------------------------------------------------------------------------------------

// Peek-lock a message from the subscription "feedings" in the topic "gilaMonster"
ls_TopicName = "gilaMonster"
ls_SubscriptionName = "feedings"

// Build the path..
loo_SbPath = create oleobject
li_rc = loo_SbPath.ConnectToNewObject("Chilkat_9_5_0.StringBuilder")

loo_SbPath.Append("/")
loo_SbPath.Append(ls_TopicName)
loo_SbPath.Append("/subscriptions/")
loo_SbPath.Append(ls_SubscriptionName)
loo_SbPath.Append("/messages/head")

// If peek-locking from a queue, the path would be built like this:
loo_SbQueuePath = create oleobject
li_rc = loo_SbQueuePath.ConnectToNewObject("Chilkat_9_5_0.StringBuilder")

loo_SbQueuePath.Append("/")
loo_SbQueuePath.Append("queueName")
loo_SbQueuePath.Append("/messages/head")
// This example will use the sbPath..

// Add a timeout parameter.
loo_Rest.AddQueryParam("timeout","20")

// Use the POST HTTP verb to peek-lock the message.
// Note that the only difference between the destructive Read-and-Delete and the non-destructive Peek-Lock
// is that the HTTP verb.  (POST is for peek-lock, DELETE is fore read-and-delete.)
loo_SbResponseBody = create oleobject
li_rc = loo_SbResponseBody.ConnectToNewObject("Chilkat_9_5_0.StringBuilder")

li_Success = loo_Rest.FullRequestNoBodySb("POST",loo_SbPath.GetAsString(),loo_SbResponseBody)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    destroy loo_SbToken
    destroy loo_SbPath
    destroy loo_SbQueuePath
    destroy loo_SbResponseBody
    return
end if

Write-Debug "Response Status Code = " + string(loo_Rest.ResponseStatusCode)

// Check for a success response.
// CAREFUL: This returns a 201 response instead of a 200 response.  In general, either 200 or 201 should always indicate success.
if loo_Rest.ResponseStatusCode <> 201 then
    Write-Debug loo_Rest.LastRequestStartLine
    Write-Debug loo_Rest.LastRequestHeader
    Write-Debug loo_SbResponseBody.GetAsString()
    Write-Debug "Failed."
    destroy loo_Rest
    destroy loo_SbToken
    destroy loo_SbPath
    destroy loo_SbQueuePath
    destroy loo_SbResponseBody
    return
end if

// The content of the message is returned in the HTTP response body.
// The HTTP response headers contains extra information.  For example:
loo_JsonBrokerProps = create oleobject
li_rc = loo_JsonBrokerProps.ConnectToNewObject("Chilkat_9_5_0.JsonObject")

loo_JsonBrokerProps.Load(loo_Rest.ResponseHdrByName("BrokerProperties"))
loo_JsonBrokerProps.EmitCompact = 0
Write-Debug loo_JsonBrokerProps.Emit()

// An example of the BrokerProperties JSON that is returned:

// 	{
// 	  "DeliveryCount": 2,
// 	  "EnqueuedSequenceNumber": 3000003,
// 	  "EnqueuedTimeUtc": "Wed, 07 Dec 2016 17:42:48 GMT",
// 	  "Label": "M2",
// 	  "LockToken": "0a13ee8a-be32-4458-89e0-5e1401caa6a0",
// 	  "LockedUntilUtc": "Wed, 07 Dec 2016 18:13:12 GMT",
// 	  "MessageId": "7bea513a6ddb49089e07bfbee26d85bd",
// 	  "SequenceNumber": 3,
// 	  "State": "Active",
// 	  "TimeToLive": 922337203685.47754
// 	}

// Also the "Location" response header contains the URI of the locked message.
// This can be used to ulock or delete the message.
Write-Debug "Location: " + loo_Rest.ResponseHdrByName("Location")

// An example of the Location URI:
// https://chilkat.servicebus.windows.net/gilamonster/subscriptions/feedings/messages/3/0a13ee8a-be32-4458-89e0-5e1401caa6a0

// If successful, the message is the contents of the response body.
ls_Message = loo_SbResponseBody.GetAsString()
Write-Debug "Received message: " + ls_Message

Write-Debug "Success."


destroy loo_Rest
destroy loo_SbToken
destroy loo_SbPath
destroy loo_SbQueuePath
destroy loo_SbResponseBody
destroy loo_JsonBrokerProps

 

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