Program/ Example 1 of Nashorn Javascript (js) Engine in Java 8 - Creating and using java threads in javascript >
package nashorn5_thread;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
* Creating and using java threads in javascript.
*
*/
public class Nashorn_useJavaObjects_Thread_InJavascript {
public static void main(String[] args) throws Exception {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
System.out.println("In java - START");
//Call js (javascript) file
engine.eval("load('E:/pocJmse/myNashornJavaScript.js')");
System.out.println("In java - FINISH");
}
}
/* OUTPUT
In java - START
In myNashornScript.js
Step 1 - Declare java Runnable interface type in javascript
Step 2 - Declare java THREAD in javascript
Step 3 - Current thread name = main
Step 4 - Create object of Runnable (i.e. myJavaRunnable)
Step 5.1 - Create Thread1 on myJavaRunnable object
x1 - Current thread name = Thread-1
Step 5.2 - Create Thread2 on myJavaRunnable object
x1 - Current thread name = Thread-2
End myNashornScript.js
In java - FINISH
*/
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Note : Output may vary on different machines in different executions because thread behavior is unpredictable in java.
E:/pocJmse/myNashornJavaScript.js looks like this (see java code equivalent to this javascript file below) >
print('In myNashornScript.js');
print('Step 1 - Declare java Runnable interface type in javascript');
var javaRunnable = Java.type('java.lang.Runnable');
print('Step 2 - Declare java THREAD in javascript');
var javaThread = Java.type('java.lang.Thread');
print('Step 3 - Current thread name = ' + javaThread.currentThread().getName());
print('Step 4 - Create object of Runnable (i.e. myJavaRunnable) ');
var myJavaRunnable = Java.extend(javaRunnable, {
// Provide implementation of run method
run : function() {
print('x1 - Current thread name = '
+ javaThread.currentThread().getName());
}
});
print('Step 5.1 - Create Thread1 on myJavaRunnable object');
var myThread1 = new javaThread(new myJavaRunnable());
myThread1.start();
print('Step 5.2 - Create Thread2 on myJavaRunnable object');
var myThread2 = new javaThread(new myJavaRunnable());
myThread2.start();
print('\nEnd myNashornScript.js');
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Let's write java code equivalent to above javascript file >
public class MyClass {
public static void main(String args[]) {
//Same as 'Step 4.1 - Create object of Runnable (i.e. myJavaRunnable) '
Runnable myJavaRunnable = new Runnable() {
@Override
public void run() {
System.out.println("x1 - Current thread name = "+Thread.currentThread().getName());
}
};
//Same as 'Step 4.2 - Create Thread1 on myJavaRunnable object'
Thread myThread1 = new Thread(myJavaRunnable);
myThread1.start();
//Same as 'Step 4.3 - Create Thread1 on myJavaRunnable object'
Thread myThread2 = new Thread(myJavaRunnable);
myThread2.start();
}
}
/* OUTPUT
x1 - Current thread name = Thread-0
x1 - Current thread name = Thread-1
*/
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Program/ Example 2 of Nashorn Javascript (js) Engine in Java 8 - Creating and using java threads in javascript >
package nashorn5_thread2;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
* Creating and using java threads in javascript.
*
*/
public class Nashorn_useJavaObjects_Thread_InJavascript {
public static void main(String[] args) throws Exception {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
System.out.println("In java - START");
//Call js (javascript) file
engine.eval("load('E:/pocJmse/myNashornJavaScript.js')");
System.out.println("In java - FINISH");
}
}
/* OUTPUT
In java - START
In myNashornScript.js
Step 1 - Declare java THREAD in javascript
Step 2 - Current thread name = main
Step 3 - Create and start javaThread in single line
x1 - Current thread name = Thread-1
End myNashornScript.js
In java - FINISH
*/
|
E:/pocJmse/myNashornJavaScript.js looks like this >
print('In myNashornScript.js');
print('Step 1 - Declare java THREAD in javascript');
var javaThread = Java.type('java.lang.Thread');
print('Step 2 - Current thread name = ' + javaThread.currentThread().getName());
print('Step 3 - Create and start javaThread in single line');
new javaThread(
function() {
print('x1 - Current thread name = '
+ javaThread.currentThread().getName());
}).start();
print('\nEnd myNashornScript.js');
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