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6.3. Creating a New Module Source Type

JBoss ON can load a CommonJS script module from different locations, including both local directories and remote repositories.

It is possible to create support for loading modules from a different source, such as a URL. Creating a new module source location requires three things:

Creating a new ScriptSourceProvider interface.
Adding the Java service entry in the META-INF/services directory of a JAR for the class.
Putting the new JAR into the lib/ directory of the CLI installation directory to be available to clients and in serverRoot/jon-server-3.3/modules/org/rhq/server-startup/main/deployments/rhq.ear/lib on the JBoss ON server so that it is available to server-side scripts (alert scripts).

Example 6.1. HTTP Module Source Location

This script source provider downloads a script module from a given URI as long as the Java version supports HTTP or HTTPS protocols.

  public class URLScriptSourceProvider implements ScriptSourceProvider {
  public Reader getScriptSource(URI scriptUri) {
  if (scriptUri == null) {
  return null;
  }
  try {
  return new InputStreamReader(scriptUri.toURL().openStream())
  } 
  catch (MalformedURLException e) {
  return null;
  } 
  catch (IOException e) {
  return null;
  }
  }
}

  public class URLScriptSourceProvider implements ScriptSourceProvider {
  public Reader getScriptSource(URI scriptUri) {
  if (scriptUri == null) {
  return null;
  }
  try {
  return new InputStreamReader(scriptUri.toURL().openStream())
  } 
  catch (MalformedURLException e) {
  return null;
  } 
  catch (IOException e) {
  return null;
  }
  }
}

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In the META-INF directory of the script provider JAR, create a services directory.

Then, within the META-INF/services/ directory, create a file called org.rhq.scripting.ScriptSourceProvider. Put the full class names of any source providers implemented in the JAR, one per line. For example, if the URLScriptSourceProvider is the only source provider:

com.example.URLScriptSourceProvider

com.example.URLScriptSourceProvider

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This is the layout of the JAR:

* com
* example 
* URLScriptSourceProvider.class
* META-INF 
* services 
* org.rhq.scripting.ScriptSourceProvider

* com
* example 
* URLScriptSourceProvider.class
* META-INF 
* services 
* org.rhq.scripting.ScriptSourceProvider

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This JAR must then ba added to the lib of the CLI installation directory. After that, scripts run through the JBoss ON CLI on that system can use the HTTP provider to download the file from the network:

var myModule = require("http://server.example.com/rhq-scripts/stuff.js");

var myModule = require("http://server.example.com/rhq-scripts/stuff.js");

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For the same source provider to be available to alert scripts, the JAR needs to be added to the modules/org/rhq/server-startup/main/deployments/rhq.ear/lib/ directory of the JBoss ON server.

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6.3. Creating a New Module Source Type

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