Scriptpad Sample

* Introduction

Scriptpad is a notepad like editor to open/edit/save and run

script (JavaScript) files. This sample demonstrates the use of

javax.script (JSR-223) API and JavaScript engine that is bundled

with JDK 6.

Scriptpad sample demonstrates how to use Javascript to use Java

classes and objects to perform various tasks such as to modify,

customize Swing GUI or to connect to a running application and

monitor it using JMX (Java Management Extensions) API.

* How to run Scriptpad?

Scriptpad can be run with the following command:

java -jar ./build/scriptpad.jar

(be sure to use the correct version of java). You can

open/edit/save scripts using menu items under "File" menu.

To run currently edited script, you can use "Tools->Run" menu.

For example, you may enter

alert("hello, world");

in the editor and run the same with "Tools->Run" menu.

You will see an alert box with the message "hello, world".

In addition to being a simple script editor/runner, scriptpad

can be used to connect to a JMX MBean server ("Tools->JMX Connect"

menu). User can specify JMX hostname and port. After connecting,

user can use "monitoring and management" script functions defined

in "mm.js" (see below).

* Scriptpad Sources

com.sun.demo.scriptpad.Main class is the entry point of this

sample. This class creates ScriptEngine and evaluates few

JavaScript "files" -- which are stored as resources (please

refer to src/resources/*.js). Actual code for the scriptpad's

main functionality lives in these JavaScript files.

1. conc.js

-- simple concurrency utilities for JavaScript

2. gui.js

-- simple GUI utilities for JavaScript

3. mm.js

-- Monitoring and Management utilities for JavaScript

4. scriptpad.js

-- This creates main "notepad"-like GUI for open/edit/save

and run script files

5. Main.js

-- This script file can be used under "jrunscript" tool.

jrunscript is an experimental tool shipped with JDK (under

$JDK_HOME/bin directory). The scriptpad application can be

run by the following commands:

cd ./src/resources

$JDK_HOME/bin/jrunscript -f Main.js -f -

* Extending Scriptpad:

It is possible to extend scriptpad using scripts. There is a global

object called "application". This object has 2 fields and a method.

Fields of the application object:

frame -> JFrame of the scriptpad

editor -> editor pane of the scriptpad

Method of the application object:

addTool -> adds a menu item under "Tools" menu

Example script to add "Tools->Hello" menu item:

application.addTool("Hello",

function() { alert("hello, world"); });

After running the above script, you can click Tools->Hello menu item

and you'll see an alert box.

Scriptpad customization may also be done by defining a file named

"scriptpad.js" under your home directory,. If this file is found,

scriptpad loads this file just after initializating everything.

In your initialization file, you can additional script functions

by "load" function.

* Script Samples:

On clicking the menu items under "Examples" menu, scriptpad shows

built-in examples in the editor. Also, there are few script samples

under the ./src/scripts directory.

* Monitoring and Management with Scriptpad:

(1) Start the application with the JMX agent - here's an example of

how the Java2D demo is started

java -Dcom.sun.management.jmxremote.port=1090 \

-Dcom.sun.management.jmxremote.ssl=false \

-Dcom.sun.management.jmxremote.authenticate=false \

-jar $JDK_HOME/demo/jfc/Java2D/Java2Demo.jar

(2) Start scriptpad and click on "Tools->JMX Connect" menu.

In the prompt, enter "localhost:1090" to connect to the above

program.

After connecting to a MBeanServer (using "Tools->JMX Connect"),

you can run any script that uses functions defined in "mm.js".

For example, it is possible to load and run management scripts that

are part of JConsole script shell plugin under the directory:

$JDK_HOME/demo/scripting/jconsole-plugin/src/scripts