Webmethods running linux commands as a java service

Recently a friend asked me how in webmethods, she could fire linux specific utility tasks. She wanted to find out if the disk space is full on linux. This can be done very easily by the “df- kh” command. But how to invoke this through webmethods?

Solution: Follow the steps below.

Step 1: Create a Java Service with the following input and output

Step 2: Paste in the following code:

//—- BEGIN OF CODE
//Author: Hussain Fakhruddin
//Date: 20090203
IDataCursor cursor = pipeline.getCursor();
//Return if no command is specified…
if (!cursor.first(“command”)) return;
String output = “”;
try {
String command = (String)cursor.getValue();
String line=”";

//Creating a Process Instance and executing the command..
Process p = Runtime.getRuntime().exec(command);

// Capturing the output.
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
output = output + line + “\n”;
}
input.close();
}
catch (Exception err) {
// Do something on error… may be throw a ServiceException
}
// setting the outputMsg for whatever output the command has given.
cursor.insertAfter(“outputMsg”, output);

//—–END OF CODE————

Step 3: Run the program and pass the unix/linux command

Note: DO NOT use commands which are not exiting after giving an output. For example “tail -f” . This service is only for commands like “df -hk” or “cp file1 file2” or “pwd” or “ls -lrt“.

If you face some issues, do feel free to write back.

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This entry was posted on Tuesday, February 3rd, 2009 at 2:31 pm and is filed under code, webmethods. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “Webmethods running linux commands as a java service”

Sundar Patnaik says:

February 27, 2009 at 4:09 am

Thanks Hussain.

Appreciate great work.
Sundar Patnaik says:

February 28, 2009 at 3:12 am

Hi,

Is there way to calculate total transactions flowing through webMethods?

Thanks in Advance.