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| Java Plug-in Node Problem |
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| jax |
 Posted: Mon Oct 27, 2003 12:23 am Post subject: Java Plug-in Node Problem |
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Novice
Joined: 10 Jul 2003
Posts: 12
Location: South Africa
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Guys,
I have the following Java code to get some data from an HTTP call.
The problem is that I, from the Input Node, get an HTTP string, pass it to a method and then returns a string from the HTTP call.
When I compile the java code, I get the following error:
| Quote: |
C:\Java\Apps\MedwareWebInterface.java:43: cannot resolve symbol
symbol : constructor MbMessage (java.lang.String)
location: class com.ibm.broker.plugin.MbMessage
MbMessage outMsg = new MbMessage(msgOut);
^
1 error |
...and this is the Java code:
| Code: |
import com.ibm.broker.plugin.*;
public class MedwareWebInterface extends MbNode implements MbNodeInterface
{
String _nodeTraceSetting;
public MedwareWebInterface() throws MbException
{
createInputTerminal("in");
createOutputTerminal("out");
createOutputTerminal("failure");
}
public static String getNodeName()
{
return "MedwareInterface";
}
public void evaluate(MbMessageAssembly assembly, MbInputTerminal in)
throws MbException
{
MbMessage newMsg = new MbMessage(assembly.getMessage());
MbMessageAssembly newAssembly = new MbMessageAssembly(assembly, newMsg);
String msgString = new MbMessage(newAssembly.getMessage()).toString();
String msgOut ="";
try
{
msgOut = new MedwareHttpCall().sendRequest(msgString);
}
catch (Exception e)
{
msgOut = e.getMessage();
}
if(_nodeTraceSetting.equals("debug"))
{
System.out.println("RETURN : "+msgOut );
}
MbMessage outMsg = new MbMessage(msgOut);
MbOutputTerminal out = getOutputTerminal("out");
out.propagate(newAssembly);
}
public String toString()
{
return getName();
}
public String getNodeTraceSetting()
{
return _nodeTraceSetting;
}
public void setNodeTraceSetting(String nodeTraceSetting)
{
_nodeTraceSetting = nodeTraceSetting;
}
} |
[/code]
It seems like I cannot instantiate a new MbMessage witha string variable.
My Java knowledge is very limited, so I cannot think of too many alternatives, please help... 
Jax |
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| lillo |
| Posted: Mon Oct 27, 2003 3:26 am Post subject: |
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Master
Joined: 11 Sep 2001
Posts: 224
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Hi,
The problem is MbMessage does not accept a string as a parameter to instanciate a new element. MbMessage only accepts another MbMessage to instanciate a new object.
I guess this is the first time you develop a wmqi plugin node. So, take a look to a redbook to see how create new plugins. I would recomend you "Devoloping solutions with WebSphere MQ Integrator".
Cheers,
_________________
Lillo
IBM Certified Specialist - WebSphere MQ |
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| jax |
| Posted: Mon Oct 27, 2003 9:26 pm Post subject: |
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Novice
Joined: 10 Jul 2003
Posts: 12
Location: South Africa
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You're quite right, it is the first time I want to develop a WMQI plug-in.
In simple terms, I want to get a string from the Input terminal, do someting with the string, and then get the returned data back into an 'MbMessage' / 'MbMessageAssembly' format so that I can push it through the output terminal.
Do you possibly have a simple example of something like that, anyone?
Thanks in Advance
Jax |
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| rwa |
| Posted: Tue Oct 28, 2003 1:58 am Post subject: |
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Voyager
Joined: 22 Jan 2002
Posts: 76
Location: Duesseldorf/Germany
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Hi Jax,
as already said, a new message has to be constructed from an existing message. This is already done with newMsg.
So replace the line "MbMessage outMsg = new MbMessage(msgOut);" with (asuming Message Domain is XML):
// The message body is the last child of the message
MbElement root = newMsg.getRootElement();
MbElement xmlElem = root.getLastChild();
// delete the message body in this message copy
MbElement elems[] = xmlElem.getAllElementsbyPath("/");
For (int i; i < elems.length; i++) {
elems[i].detach();
}
// Now fill the message
xmlElem.createElementAsFirstChild(MbElement.TYPE_NAME,
"Return", (Object) msgOut);
This message has to be released after the propagate. So add
newMsg.clearMessage();
after
out.propagate(newAssembly);
The body in the output message should look like:
<Return>text</Return>
This is an example out of my head. So there could be one or two errors in it. But this example shows the way how to do it.
Regards,
Rainer |
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