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| javacompute node to build body of the message |
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Message
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| vennela |
 Posted: Wed Feb 01, 2006 1:11 pm Post subject: javacompute node to build body of the message |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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I am trying to use JavaCompute node to build the body of my outgoing message.
For now I am trying to create the XML elements within the code. I am able to set the MQMD fields successfully. But the data is not getting in the output message. Below is the code I am using.
Let me know what the mistake is.
| Code: |
MbOutputTerminal out = getOutputTerminal("out");
MbOutputTerminal alt = getOutputTerminal("alternate");
MbMessage inMessage = contact admin.getMessage();
// create new message
//MbMessage outMessage = new MbMessage(inMessage);
MbMessage outMessage = new MbMessage();
MbMessageAssembly outAssembly = new MbMessageAssembly(contact admin,
outMessage);
try {
// ----------------------------------------------------------
// Add user code below
MbElement inputRoot = inMessage.getRootElement();
MbElement inputBody = inputRoot.getLastChild();
MbElement outputRoot = outMessage.getRootElement();
//MbElement outputBody = outputRoot.getLastChild();
MbElement mqmd = outputRoot.createElementAsFirstChild("MQHMD");
mqmd.createElementAsFirstChild(MbElement.TYPE_NAME_VALUE,"Format","XML");
mqmd.createElementAsFirstChild(MbElement.TYPE_NAME_VALUE, "ReplyToQ","ReplyToQ1");
MbElement outBody = outputRoot.getLastChild();
MbElement outName = outBody.createElementAsLastChild(MbElement.TYPE_NAME, "Name", null);
outName.createElementAsFirstChild(MbElement.TYPE_NAME_VALUE, "FirstName","John");
outName.createElementAsFirstChild(MbElement.TYPE_NAME_VALUE, "LastName","Smith");
// End of user code
// ----------------------------------------------------------
// The following should only be changed
// if not propagating message to the 'out' terminal
out.propagate(outAssembly); |
The output I am trying for is
| Code: |
<Name>
<FirstName>John </FirstName>
<LastName>Smith</LastName>
</Name> |
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| dipankar |
| Posted: Wed Feb 01, 2006 8:31 pm Post subject: |
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Disciple
Joined: 03 Feb 2005
Posts: 171
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Try with this.
| Code: |
import com.ibm.broker.javacompute.MbJavaComputeNode;
import com.ibm.broker.plugin.*;
/*
* Created on Jan 13, 2006
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
/**
* @author mqsiuid
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class CreateNewMsg_ComputeNode_JavaCompute extends MbJavaComputeNode {
public void evaluate(MbMessageAssembly contact admin) throws MbException {
MbOutputTerminal out = getOutputTerminal("out");
MbOutputTerminal alt = getOutputTerminal("alternate");
MbMessage inMessage = contact admin.getMessage();
// create new message
MbMessage outMessage = new MbMessage();
MbMessageAssembly outAssembly = new MbMessageAssembly(contact admin,
outMessage);
// optionally copy message headers
copyMessageHeaders(inMessage, outMessage);
// MbElement outBody = outRoot.
MbElement outRoot = outMessage.getRootElement().createElementAsLastChild("XML");
MbElement Employee = outRoot.createElementAsFirstChild(MbElement.TYPE_NAME,"Name",null);
MbElement EmpName = Employee.createElementAsLastChild(MbElement.TYPE_NAME,"FirstName","John");
//MbElement EmpTitle = EmpName.createElementAsFirstChild(MbElement.TYPE_NAME_VALUE,"Title","Paul");
MbElement EmpDsg = EmpName.createElementAfter(MbElement.TYPE_NAME,"LastName","Smith");
// ----------------------------------------------------------
// Add user code below
// End of user code
// ----------------------------------------------------------
// The following should only be changed
// if not propagating message to the 'out' terminal
out.propagate(outAssembly);
// clear the outMessage
outMessage.clearMessage();
}
public void copyMessageHeaders(MbMessage inMessage, MbMessage outMessage)
throws MbException {
MbElement outRoot = outMessage.getRootElement();
// iterate though the headers starting with the first child of the root element
MbElement header = inMessage.getRootElement().getFirstChild();
while (header != null && header.getNextSibling() != null) // stop before the last child (body)
{
// copy the header and add it to the out message
outRoot.addAsLastChild(header.copy());
// move along to next header
header = header.getNextSibling();
}
}
} |
I have just followed the following link
http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r0m0/index.jsp?topic=/com.ibm.etools.mft.doc/ac30350_.htm
_________________
Regards |
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| elvis_gn |
| Posted: Wed Feb 01, 2006 9:27 pm Post subject: |
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Padawan
Joined: 08 Oct 2004
Posts: 1905
Location: Dubai
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Hi vennela,
Both your's and dipankar's code looks same...
The one noticable difference was the below
| vennela wrote: |
| MbElement outBody = outputRoot.getLastChild(); |
whereas dipankar's
| dipankar wrote: |
| MbElement outRoot = outMessage.getRootElement().createElementAsLastChild("XML"); |
The name of the body is not set.
This could be the reason why it did not work.
Regards. |
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| vennela |
| Posted: Wed Feb 01, 2006 9:40 pm Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
|
I am pretty sure the above code also wouldn't work, though I did not try it myself.
I saw the link posted above and that is one of the pages I used to code.
IMHO, I don't think it is that straight forward.
We'll have to use MbXPath's extensions to set fields.
I had to make two modifications.
1. For the MQInput message, I had to set the domain as XML. I guess, this could be done inside the compute node by specifying the parser, but I haven't figured that yet.
2. Issue MbXpath commands to set values.
Here is the code snippet that is working.
I copied the input message to output message. Then I am setting the FirstName value here.
| Code: |
MbElement inputRoot = inMessage.getRootElement();
MbElement inputBody = inputRoot.getLastChild();
MbElement outputRoot = outMessage.getRootElement();
MbElement outputBody = outputRoot.getLastChild();
MbElement newName = outputBody.getFirstChild();
String sFN = "Siri";
MbXPath setFN = new MbXPath("//FirstName[set-value($xsFN)]");
setFN.assignVariable("xsFN", sFN);
newName.evaluateXPath(setFN); |
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| dipankar |
| Posted: Thu Feb 02, 2006 1:13 am Post subject: |
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Disciple
Joined: 03 Feb 2005
Posts: 171
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Hi elvis_gn and vennela,
Have you tested my code???????
I am dead sure that my code will work as I have tested it in my system. And the result is same as vennela expected.
| Code: |
| MbElement outRoot = outMessage.getRootElement().createElementAsLastChild("XML"); |
As far as I know, the above line is equivalent to OutputRoot.XML and the way to specify the domain.
See the following documents
| Quote: |
In the template code, the default constructor of MbMessage is called to create a blank message, as shown in the following Java code:
MbMessage outMessage = new MbMessage();
The headers can be copied from the incoming message using the supplied utility method, copyMessageHeaders(), as shown in this Java code:
copyMessageHeaders(inMessage, outMessage);
The new message body can now be created. First, add the top level parser element. For XML, this is:
MbElement outRoot = outMessage.getRootElement();
MbElement outBody = outRoot.createElementAsLastChild("XMLNSC");
The remainder of the message can then be built up using the createElement methods and the extended syntax of the broker XPath implementation. |
Here I have used 'XML' instead of 'XMLNSC'
Besides this, I have used TYPE_NAME instead of TYPE_NAME_VALUE.
TYPE_NAME_VALUE is used for creating attribute.
_________________
Regards |
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| dipankar |
| Posted: Thu Feb 02, 2006 1:36 am Post subject: |
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Disciple
Joined: 03 Feb 2005
Posts: 171
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Vennela,
| Quote: |
| We'll have to use MbXPath's extensions to set fields. |
This is not only one option to create element for outbound message.
Please have a look at the following link
http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r0m0/index.jsp?topic=/com.ibm.etools.mft.doc/ac30340_.htm
| Quote: |
| I copied the input message to output message |
I believe that for new output message, we need only to copy message header as we do in ESQL, not the full message. It would have been inconvenient.
Please correct me if I am wrong.
_________________
Regards |
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| elvis_gn |
| Posted: Thu Feb 02, 2006 1:51 am Post subject: |
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Padawan
Joined: 08 Oct 2004
Posts: 1905
Location: Dubai
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Hi dipankar,
| dipankar wrote: |
| I believe that for new output message, we need only to copy message header as we do in ESQL, not the full message. |
You are right, but I guess vennela did it only for his testing purposes.
vennela:
I think you should try removing the Xpath and only setting the domain...lets make sure that we have no option but to use Xpath.
Regards. |
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| vennela |
| Posted: Thu Feb 02, 2006 9:06 am Post subject: |
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Jedi Knight
Joined: 11 Aug 2002
Posts: 4055
Location: Hyderabad, India
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Yes, the above code posted by dipankar worked.
Thank you. |
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