Using Service Broker For Reliably Transmitting Events To Consuming Applications

Apr 16, 2006

Hi, I have a scenario in which an application generates events upon updates to the database, which need to be reliably transmitted to consuming applications running a) other SQL Server instances and b) as remote web services.

Now,

1) I am planning to use SQL Server Notification Services to generate these events, and allow the consuming applications to subscribe to them.

2) The events will be sent to a ReceiveEvent service, which will then process the event and put it in the respective queues for the Subscriber (consumer) applications.

3) The services representing these consumer applications will then get activated, and sent the message across directly to the service broker on the consumer side in case of situation a - where there is a SQL Server on the other side

4) In case the other side is a web service, I plan to make a SOAP request directly from my queue handler, and depending on the response received, decide whether to commit or roll back that particular transaction.

Does this seem like a good solution? I am very new to the Service Broker, and I am still getting my hands dirty. Any comments/suggestions would be very highly appreciated!

Regards,

Siddhesh

siddhesh@persistent.co.in





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Creating Distributed Applications Using Service Broker

Dec 13, 2007


Hello everybody!

We are developing a distributed application based on Tree Network Topology. Any part of this application knows only for one parent part and all children parts. For synchronize data with parts of this application we using SQL Service Broker.

Every part contains database. Let€™s name it €œSB€?. This database contains one QUEUE for received and sent messages, MESSAGE TYPE, CONTRACT and SERVICE. Any Service on part has unique name. Also there are one REMOTE SERVICE BINDING and ROUTE for parent part (service) and on one fore every child part (service). For each link Source €“ Target we create separate conversation_handle:

"BEGIN DIALOG @ConversationHandle FROM SERVICE [Source] TO SERVICE 'Target' ON CONTRACT Contract WITH ENCRYPTION = OFF;"

All works fine, messages sends and received quite well.
But if we have opposite messages in one moment, with probability 100 percent one of messages, will be missing. Why it happened? Is duplex is not supported in Service Broker? May we do something wrong? Anybody encounter this problem?

We using flag retention = on for queue, to analyze messages after they processed. Body of Message that sent into several services (in one transaction) absent in that service from which the message during the same moment has been sent.

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Nov 30, 2007

Hello,

I'm working on the design of a system that will have two queues. The first queue will take requests to do something. The second queue will hold the results of having done something. Both queues won't necessarily be on the same physical server. Clients reading/writing to the queue will not be using SQL server. Web service/WCF interfaces will be developed to interrogate/manipulate queues.

My question is: which is better - MSMQ or Service Broker; if I want reliable queues. I can affort to loose items off the first queue, but cannot afford to loose any result data on the second queue.

Can anyone make any recommendations please?

Regards,
Jonathan.

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Consuming Events In Code

Sep 6, 2007



Hi,
Ive been taking a look at how to consume events from a package when executing programatically.

Ive got some code (copied below) that creates a package programatically, adds a sequence container then within that adds a script task , then executes it using the overloaded method of Package.Execute() that takes an IDtsEvents argument.

My class that implements IDtsEvents simply output a message to the console for each event type.

Weird thing is, when I execute, this is the only output I get:

Starting...
OnPreValidate: Microsoft.SqlServer.Dts.Runtime.Package
OnPreValidate: Microsoft.SqlServer.Dts.Runtime.Sequence
OnPreValidate: Microsoft.SqlServer.Dts.Runtime.TaskHost
OnPostValidate:Microsoft.SqlServer.Dts.Runtime.TaskHost
OnQueryCancel
Package ran successfully


What I find weird is that I dont get information for loads of other event types. I would at least have expected to see some OnPostExecute events.

Anyone know why i dont see all of the events?

Thanks
Jamie

Heres the code:



Code Snippet
using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.SqlServer.Dts.Runtime;
using Microsoft.SqlServer.Dts.Tasks.ScriptTask;
namespace Package_API
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Starting...");
Package p = new Package();
p.InteractiveMode = true;
p.OfflineMode = true;
// Add a Script Task to the package.
Sequence s = (Sequence)p.Executables.Add("STOCK:Sequence");
TaskHost taskH = (TaskHost)s.Executables.Add("STOCK:ScriptTask");
// Run the package.
DtsEvents events = new DtsEvents();
p.Execute(null,null,events,null,null);
//p.Execute();
if (p.ExecutionResult == DTSExecResult.Failure || p.ExecutionStatus == DTSExecStatus.Abend)
Console.WriteLine("Package failed or abended");
else
Console.WriteLine("Package ran successfully");
Console.ReadLine();
}
}
}

// Class that implements the IDTSEvents interface:
public sealed class DtsEvents : IDTSEvents
{
void IDTSEvents.OnPreExecute(Executable exec, ref bool fireAgain)
{
Console.WriteLine("OnPreExecute: " + exec.ToString());
}
void IDTSEvents.OnBreakpointHit(IDTSBreakpointSite breakpointSite, BreakpointTarget breakpointTarget)
{
Console.WriteLine("OnBreakpointHit");
}
void IDTSEvents.OnCustomEvent(TaskHost taskHost,string eventName,string eventText,ref Object[] arguments,string subComponent,ref bool fireAgain)
{
Console.WriteLine("CustomEvent");
}
void IDTSEvents.OnPreValidate(Executable exec, ref bool fireAgain)
{
Console.WriteLine("OnPreValidate: " + exec.ToString());
}
void IDTSEvents.OnPostValidate(Executable exec, ref bool fireAgain)
{
Console.WriteLine("OnPostValidate:" + exec.ToString());
}
void IDTSEvents.OnWarning(DtsObject source,int warningCode,string subComponent,string description,string helpFile,int helpContext,string idofInterfaceWithError)
{
Console.WriteLine("OnWarning");
}
void IDTSEvents.OnInformation(DtsObject source,int informationCode,string subComponent,string description,string helpFile,int helpContext,string idofInterfaceWithError,ref bool fireAgain)
{
Console.WriteLine("OnInformation");
}
void IDTSEvents.OnPostExecute(Executable exec, ref bool fireAgain)
{
Console.WriteLine("OnPostExecute");
}
bool IDTSEvents.OnError(DtsObject source,int errorCode,string subComponent,string description,string helpFile,int helpContext,string idofInterfaceWithError)
{
Console.WriteLine("OnError");
return true;
}
void IDTSEvents.OnTaskFailed(TaskHost taskHost)
{
Console.WriteLine("OnTaskFailed");
}
void IDTSEvents.OnProgress(TaskHost taskHost,string progressDescription,int percentComplete,int progressCountLow,int progressCountHigh,string subComponent,ref bool fireAgain)
{
Console.WriteLine("OnProgress");
}
bool IDTSEvents.OnQueryCancel()
{
Console.WriteLine("OnQueryCancel");
return true;
}
void IDTSEvents.OnExecutionStatusChanged(Executable exec,DTSExecStatus newStatus,ref bool fireAgain)
{
Console.WriteLine("OnExecutionStatusChanged");
}
void IDTSEvents.OnVariableValueChanged(DtsContainer DtsContainer,Variable variable,ref bool fireAgain)
{
Console.WriteLine("OnVariableValueChanged");
}
}







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Hi,



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I look forward to some responses.



Kind regards,

Neeva

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Hi:



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Oct 9, 2007



Hi,

Need a guidance on consuming the WCF service with complex type in the SSIS package.
I have a WCF service with complex type inside the complex type (Nested complex type) in the web method as an argument. When I try to use this WCF service in the SSIS web service task, I get an error "The web method has unsupported arguments".

I am able to consume the WCF service with the web method having Complex type and simple/prmitive type in side that as argument.

For example:

The web method in WCF service which accepts the argument as comlex type say "Employee" whose structure is:

Employee
{
FName String;
LName String;
Age int
}

It is possible to consume this WCF service and pass the arguments.

But when the Employee complex type is changed to have one more complex type in side it it give the above mentioned error. The Employee type is modified as:

Employee
{
FName String;
LName String;
Age String
Type EmployeeType;
}


EmployeeType
{
type string;
}

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CREATE PROCEDURE [usp_ProcessMessage]

AS

BEGIN

SET NOCOUNT ON;

DECLARE @conversation_handle uniqueidentifier

DECLARE @message_body AS VARBINARY(MAX)

WHILE (1=1)

BEGIN

BEGIN TRANSACTION;

WAITFOR(RECEIVE TOP (1)

@conversation_handle = conversation_handle,

@message_body = message_body

FROM [tcp://mydomain.com/INITIATE/MyQueue]

), TIMEOUT 1000;

IF (@@ROWCOUNT = 0)

BEGIN

COMMIT;

BREAK;

END

END CONVERSATION @conversation_handle

IF @message_body IS NOT NULL

BEGIN



BEGIN DIALOG CONVERSATION @conversation_handle

FROM SERVICE [tcp://mydomain.com/INITIATE/MyService]

TO SERVICE '[tcp://mydomain.com/TARGET/MyService]'

ON CONTRACT [tcp://mydomain.com/INITIATE/MyMessage/v1.0]

WITH ENCRYPTION = ON, LIFETIME = 600;

SEND ON CONVERSATION @conversation_handle

MESSAGE TYPE [tcp://mydomain.com/TARGET/VisitMessage]

(@message_body);

END

COMMIT;

END

END

GO



My endpoints are created like so:



CREATE ENDPOINT MyEndpoint

STATE = STARTED

AS TCP

(

LISTENER_PORT = 4022

)

FOR SERVICE_BROKER (AUTHENTICATION = CERTIFICATE MasterCertificate)

GO



GRANT CONNECT TO CertOwner

GRANT CONNECT ON ENDPOINT::MyEndpoint TO CertOwner

GO



And my routes like so:



GRANT SEND ON SERVICE::[tcp://mydomain.com/INITIATE/MyService] TO CertOwner

GO

CREATE REMOTE SERVICE BINDING [MyCertificateBinding]

TO SERVICE '[tcp://mydomain.com/TARGET/MyService]'

WITH USER = CertOwner,

ANONYMOUS=OFF

CREATE ROUTE [tcp://mydomain.com/INITIATE/MyRoute]

WITH SERVICE_NAME = '[tcp://mydomain.com/TARGET/MyService]',

BROKER_INSTANCE = N'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx',

ADDRESS = N'TCP://xxx.xx.xx.xx:4022'

GO

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CREATE QUEUE SentQueue
WITH
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CREATE QUEUE ReceivedQueue
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CREATE SERVICE SentService ON QUEUE SentQueue
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CREATE SERVICE ReceivedService ON QUEUE ReceivedQueue
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SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TRIGGER [dbo].[insertTrigger]
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--Sends a message
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MESSAGE TYPE SentMsgType
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END


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My
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Everything works fine!Cool!



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Hi,

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Regards,

Manfred



create message type Preisanfrage
validation = well_formed_xml;

create message type PreisanfrageAntwort
validation = well_formed_xml;

create contract PreisanfrageContract
(
Preisanfrage sent by initiator,
PreisanfrageAntwort sent by target
);



create queue PreisanfrageRequestorQueue with
status=on;

create queue PreisanfrageQueue;



create service PreisanfrageRequestorService
on queue PreisanfrageRequestorQueue ( PreisanfrageContract );


create service PreisanfrageService
on queue PreisanfrageQueue (PreisanfrageContract );

create table debug_table;
create table debug_table (id int primary key identity(1,1), msg varchar(100));

create procedure PreisanfrageAction
as
declare @conversation uniqueidentifier
declare @msg nvarchar(max)
declare @msgType nvarchar(256)
declare @answer xml;

insert into debug_table(msg) values('1');

;receive top(1)
@conversation = conversation_handle,
@msg = message_body,
@msgType = message_type_name
from PreisanfrageQueue;

insert into debug_table(msg) values('2');

-- Preisanfrage bearbeiten


set @answer = '<preis>1</preis>';
;send on conversation @conversation
message type PreisanfrageAntwort (@answer);

end conversation @conversation;

insert into debug_table(msg) values('3');

alter queue PreisanfrageQueue
with
status=on,
activation (
status=on,
PROCEDURE_NAME = PreisanfrageAction,
max_queue_readers = 100,
EXECUTE AS OWNER
);




-- Dialog starten

declare @conversation uniqueidentifier;

begin dialog conversation @conversation
from service [PreisanfrageRequestorService]
to service 'PreisanfrageService'
on contract [PreisanfrageContract];

declare @request xml;

set @request = '<?xml version="1.0" encoding="UTF-8"?><Preisanfrage xmlns="4711101'">http://www.xyz.at/samples/Preisanfrage"><KundenId>4711</KundenId><ProduktId>10</ProduktId><Anzahl>1</Anzahl></Preisanfrage>';

;send on conversation @conversation
message type Preisanfrage ( @request );

receive * from PreisanfrageQueue;

receive * from PreisanfrageRequestorQueue;


select * from debug_table


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I built this script and ran it in management studio with success and felt it should work for me running as the sql for an OLE DB source.

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select @ch = conversation_handle

from dm.[consultant queue]

where message_type_name = 'BatchEnd';

Receive conversation_handle, message_type_name, message_body

from dm.[consultant queue]

where conversation_handle = @ch;

But SSIS constantly complains about it. I finally profiled SSIS to catch the sql that it is executing. It is below and this fails with an error about a missing conversation_handle.


declare @p1 int

exec sp_prepare @p1 output,NULL,N'declare @ch uniqueidentifier;

select @ch = conversation_handle

from dm.[consultant queue]

where message_type_name = ''BatchEnd'';

Receive conversation_handle, message_type_name, message_body

from dm.[consultant queue]

where conversation_handle = @ch;',1

select @p1

go



Now I'm not sure which team may own this, but shouldn't this sp_prepare work. If I change this to use a table variable then the prepare seems to work just fine, but then I never actually get any data back into SSIS. It is almost like it calls it twice; although, I could not confirm that with profiler.

I'll cross post this in the Service Broker forum too.

Thanks!

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How To Run The Service Broker Samples

May 24, 2006

I am trying to run the Readme_HelloWorld sample on the SQL server 2005 Books online. But don't know where I can get the setup.sql, SendMessage.sql, ReceiveMessage.sql scripts.

I followed two examples on the blog, but they did not work at all. Here are the scripts:

/* example 1 */
create database TestSB
go
use TestSB
go
create queue TxQ
create queue RxQ
create message type Msg
create contract MsgContract(Msg SENT BY ANY)
create service TxSve on Queue TxQ
Create service RxSve on Queue RxQ
declare @h uniqueidentifier
begin dialog conversation @h
 from service TxSve to Service 'RxSve'
 on contract MsgContract;
 send on conversation @h Message type Msg ('<hello>World</hello>')
end conversation @h with CLEANUP;

select *
from RxQ

/* example 2 */
use testsb
go

create message type HelloMessage
validation = NONE
go

/** 2. create contract **/
create contract HelloContract
(HelloMessage SENT by initiator)

/** 3. create queue **/
create queue SenderQueue
create queue ReceiverQueue

/** 4. create service **/
create service sender
on queue SenderQueue

create service receiver
on queue ReceiverQueue(HelloContract)

declare @handle uniqueidentifier
declare @message nvarchar(100)

begin
 begin transaction;
  begin dialog conversation @handle
    from service sender
    to service 'receiver'
    on contract HelloContract
    set @message = N'Hello, World';
    send on conversation @handle
   message type HelloMessage(@message)
  end conversation @handle
 commit transaction
end
go

Receive convert(nvarchar(max), message_body) as message1
from ReceiverQueue

select  convert(nvarchar(max), message_body) as message1
from ReceiverQueue

select *
from SenderQueue

select *
from Receiverqueue

Any assistance or WORKING samples are greatly appreciated.

 

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