Java Code Examples for javax.script.ScriptEngine#getContext()

/**
 * Adds the passed context variables of the rule engine to the context scope of the ScriptEngine, this should be
 * updated each time the module is executed
 *
 * @param engine the script engine that is used
 * @param context the variables and types to put into the execution context
 */
protected void setExecutionContext(ScriptEngine engine, Map<String, ?> context) {
    ScriptContext executionContext = engine.getContext();

    // Add the rule's UID to the context and make it available as "ctx".
    // Note: We don't use "context" here as it doesn't work on all JVM versions!
    final Map<String, Object> contextNew = new HashMap<>(context);
    contextNew.put("ruleUID", this.ruleUID);
    executionContext.setAttribute("ctx", contextNew, ScriptContext.ENGINE_SCOPE);

    // Add the rule's UID to the global namespace.
    executionContext.setAttribute("ruleUID", this.ruleUID, ScriptContext.ENGINE_SCOPE);

    // add the single context entries without their prefix to the scope
    for (Entry<String, ?> entry : context.entrySet()) {
        Object value = entry.getValue();
        String key = entry.getKey();
        int dotIndex = key.indexOf('.');
        if (dotIndex != -1) {
            key = key.substring(dotIndex + 1);
        }
        executionContext.setAttribute(key, value, ScriptContext.ENGINE_SCOPE);
    }
}
 

/**
 * Test multi-threaded access to global getters and setters for shared script classes with multiple globals.
 */
@Test
public static void getterSetterTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "accessor1";

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), origContext);
    assertEquals(e.eval("accessor1 = 1;"), 1);
    assertEquals(e.eval(sharedScript), 1);

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), newCtxt);
    assertEquals(e.eval("accessor1 = 2;", newCtxt), 2);
    assertEquals(e.eval(sharedScript, newCtxt), 2);


    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, 1, 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, 2, 1000));

    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval(sharedScript), 1);
    assertEquals(e.eval(sharedScript, newCtxt), 2);
    assertEquals(e.eval("v"), 1);
    assertEquals(e.eval("v", newCtxt), 2);
}
 

/**
 * Test multi-threaded access to defined global variables for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedVarTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "foo";

    assertEquals(e.eval("var foo = 'original context';", origContext), null);
    assertEquals(e.eval("var foo = 'new context';", newCtxt), null);

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval("var foo = 'newer context';", newCtxt), null);
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();

    assertEquals(e.eval(sharedScript), "original context");
    assertEquals(e.eval(sharedScript, newCtxt), "newer context");
}
 

/**
 * Test multi-threaded access to prototype user accessor properties for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedAccessorTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);

    e.eval("Object.defineProperty(Object.prototype, 'foo', { get: function() 'original context' })", origContext);
    e.eval("Object.defineProperty(Object.prototype, 'foo', { get: function() 'new context', configurable: true })", newCtxt);
    final String sharedScript = "({}).foo";

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    final Object obj3 = e.eval("delete Object.prototype.foo; Object.prototype.foo = 'newer context';", newCtxt);
    assertEquals(obj3, "newer context");
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();
}
 

/**
 * Test multi-threaded access to global getters and setters for shared script classes with multiple globals.
 */
@Test
public static void getterSetterTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "accessor1";

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), origContext);
    assertEquals(e.eval("accessor1 = 1;"), 1);
    assertEquals(e.eval(sharedScript), 1);

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), newCtxt);
    assertEquals(e.eval("accessor1 = 2;", newCtxt), 2);
    assertEquals(e.eval(sharedScript, newCtxt), 2);


    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, 1, 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, 2, 1000));

    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval(sharedScript), 1);
    assertEquals(e.eval(sharedScript, newCtxt), 2);
    assertEquals(e.eval("v"), 1);
    assertEquals(e.eval("v", newCtxt), 2);
}
 

/**
 * Test multi-threaded access to undefined global variables for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedGlobalTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);

    assertEquals(e.eval("foo = 'original context';", origContext), "original context");
    assertEquals(e.eval("foo = 'new context';", newCtxt), "new context");
    final String sharedScript = "foo";

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    final Object obj3 = e.eval("delete foo; foo = 'newer context';", newCtxt);
    assertEquals(obj3, "newer context");
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();

    Assert.assertEquals(e.eval(sharedScript), "original context");
    Assert.assertEquals(e.eval(sharedScript, newCtxt), "newer context");
}
 

/**
 * Instantiates a new connection to JSR 223 scripting engine.
 *
 * @param parameters connection parameters.
 */
public ScriptConnection(ConnectionParameters parameters) {
    super(parameters);
    String lang = parameters.getStringProperty(LANGUAGE);
    ScriptEngineManager scriptEngineManager = new ScriptEngineManager(ScriptConnection.class.getClassLoader());
    if (StringUtils.isEmpty(lang)) { //JavaScript is used by default
        LOG.fine("Script language was not specified. JavaScript is default.");
        lang = "js";
    }

    ScriptEngine engine = scriptEngineManager.getEngineByName(lang);
    if (engine == null) {
        throw new ConfigurationException("Specified " + LANGUAGE + "=" + lang + " not supported. Available values are: " +
                getAvailableEngines(scriptEngineManager));
    }
    engineWrapper = new ScriptEngineWrapper(engine);
    LOG.fine("Script engine selected: " + engine.getFactory().getEngineName());
    if (engineWrapper.isCompilable()) {
        cache = new IdentityHashMap<>();
    } else {
        LOG.info("Engine " + engine.getFactory().getEngineName() + " does not support compilation. Running in interpreted mode.");
    }
    if (engineWrapper.isNashornScriptEngine()) {
        LOG.warning("Nashorn JavaScript Engine is not fully supported. \n" +
                "See https://github.com/scriptella/scriptella-etl/issues/2 for status and workarounds.");
    }
    if (!StringUtils.isEmpty(parameters.getUrl())) { //if url is specified
        url = parameters.getResolvedUrl();
        //setUp reader and writer for it
        ScriptContext ctx = engine.getContext();
        ctx.setReader(new LazyReader());
        //JS engine bug - we have to wrap with PrintWriter, because otherwise print function won't work.
        ctx.setWriter(new PrintWriter(new LazyWriter()));
    }
    encoding = parameters.getCharsetProperty(ENCODING);
    ScriptEngineFactory f = engine.getFactory();
    setDialectIdentifier(new DialectIdentifier(f.getLanguageName(), f.getLanguageVersion()));
}
 

@Test
public void testGlobalScopeSearch() throws Exception {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final ScriptContext c = e.getContext();
    c.setAttribute("name1234", "value", ScriptContext.GLOBAL_SCOPE);
    assertEquals(c.getAttribute("name1234"), "value");
    assertEquals(c.getAttributesScope("name1234"),
        ScriptContext.GLOBAL_SCOPE);
}
 

/**
 * Test multi-threaded access to primitive prototype user accessor properties for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedPrimitiveAccessorTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);

    e.eval("Object.defineProperty(String.prototype, 'foo', { get: function() 'original context' })", origContext);
    e.eval("Object.defineProperty(String.prototype, 'foo', { get: function() 'new context' })", newCtxt);
    final String sharedScript = "''.foo";

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    final Object obj3 = e.eval("delete String.prototype.foo; Object.prototype.foo = 'newer context';", newCtxt);
    assertEquals(obj3, "newer context");
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();
}
 

@Test
public void testScriptContextGetRemoveUndefined() throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine e = manager.getEngineByName("nashorn");
    final ScriptContext ctx = e.getContext();
    assertNull(ctx.getAttribute("undefinedname", ScriptContext.ENGINE_SCOPE));
    assertNull(ctx.removeAttribute("undefinedname", ScriptContext.ENGINE_SCOPE));
}
 

/**
 * Test multi-threaded access to global lexically declared variables for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedLetTest() throws ScriptException, InterruptedException {
    final NashornScriptEngineFactory factory = new NashornScriptEngineFactory();
    final ScriptEngine e = factory.getScriptEngine(LANGUAGE_ES6);
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "foo";

    assertEquals(e.eval("let foo = 'original context';", origContext), null);
    assertEquals(e.eval("let foo = 'new context';", newCtxt), null);

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval("foo = 'newer context';", newCtxt), "newer context");
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();

    assertEquals(e.eval(sharedScript), "original context");
    assertEquals(e.eval(sharedScript, newCtxt), "newer context");
}
 

/**
 * Test multi-threaded access to primitive prototype properties for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedPrimitiveTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);

    final Object obj1 = e.eval("String.prototype.foo = 'original context';", origContext);
    final Object obj2 = e.eval("String.prototype.foo = 'new context';", newCtxt);
    assertEquals(obj1, "original context");
    assertEquals(obj2, "new context");
    final String sharedScript = "''.foo";

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    final Object obj3 = e.eval("delete String.prototype.foo; Object.prototype.foo = 'newer context';", newCtxt);
    assertEquals(obj3, "newer context");
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();

    Assert.assertEquals(e.eval(sharedScript), "original context");
    Assert.assertEquals(e.eval(sharedScript, newCtxt), "newer context");
}
 

/**
 * Test multi-threaded access to prototype user accessor properties for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedAccessorTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);

    e.eval("Object.defineProperty(Object.prototype, 'foo', { get: function() 'original context' })", origContext);
    e.eval("Object.defineProperty(Object.prototype, 'foo', { get: function() 'new context', configurable: true })", newCtxt);
    final String sharedScript = "({}).foo";

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    final Object obj3 = e.eval("delete Object.prototype.foo; Object.prototype.foo = 'newer context';", newCtxt);
    assertEquals(obj3, "newer context");
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();
}
 

/**
 * Test multi-threaded access to defined global variables for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedVarTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "foo";

    assertEquals(e.eval("var foo = 'original context';", origContext), null);
    assertEquals(e.eval("var foo = 'new context';", newCtxt), null);

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval("var foo = 'newer context';", newCtxt), null);
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();

    assertEquals(e.eval(sharedScript), "original context");
    assertEquals(e.eval(sharedScript, newCtxt), "newer context");
}
 

/**
 * Test multi-threaded access to primitive prototype user accessor properties for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedPrimitiveAccessorTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);

    e.eval("Object.defineProperty(String.prototype, 'foo', { get: function() 'original context' })", origContext);
    e.eval("Object.defineProperty(String.prototype, 'foo', { get: function() 'new context' })", newCtxt);
    final String sharedScript = "''.foo";

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    final Object obj3 = e.eval("delete String.prototype.foo; Object.prototype.foo = 'newer context';", newCtxt);
    assertEquals(obj3, "newer context");
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();
}
 

/**
 * Test multi-threaded access to global getters and setters for shared script classes with multiple globals.
 */
@Test
public static void getterSetter2Test() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "accessor2";

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), origContext);
    assertEquals(e.eval("accessor2 = 1;"), 1);
    assertEquals(e.eval(sharedScript), 1);

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), newCtxt);
    assertEquals(e.eval("accessor2 = 2;", newCtxt), 2);
    assertEquals(e.eval(sharedScript, newCtxt), 2);


    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, 1, 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, 2, 1000));

    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval(sharedScript), 1);
    assertEquals(e.eval(sharedScript, newCtxt), 2);
    assertEquals(e.eval("x"), 1);
    assertEquals(e.eval("x", newCtxt), 2);
}
 

/**
 * Test multi-threaded access to global getters and setters for shared script classes with multiple globals.
 */
@Test
public static void getterSetterTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "accessor1";

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), origContext);
    assertEquals(e.eval("accessor1 = 1;"), 1);
    assertEquals(e.eval(sharedScript), 1);

    e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), newCtxt);
    assertEquals(e.eval("accessor1 = 2;", newCtxt), 2);
    assertEquals(e.eval(sharedScript, newCtxt), 2);


    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, 1, 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, 2, 1000));

    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval(sharedScript), 1);
    assertEquals(e.eval(sharedScript, newCtxt), 2);
    assertEquals(e.eval("v"), 1);
    assertEquals(e.eval("v", newCtxt), 2);
}
 

/**
 * Test multi-threaded access to defined global variables for shared script classes with multiple globals.
 */
@Test
public static void multiThreadedVarTest() throws ScriptException, InterruptedException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext origContext = e.getContext();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
    final String sharedScript = "foo";

    assertEquals(e.eval("var foo = 'original context';", origContext), null);
    assertEquals(e.eval("var foo = 'new context';", newCtxt), null);

    final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
    t1.start();
    t2.start();
    t1.join();
    t2.join();

    assertEquals(e.eval("var foo = 'newer context';", newCtxt), null);
    final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
    final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));

    t3.start();
    t4.start();
    t3.join();
    t4.join();

    assertEquals(e.eval(sharedScript), "original context");
    assertEquals(e.eval(sharedScript, newCtxt), "newer context");
}
 

@Test
public void multiGlobalTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    final Bindings b = e.createBindings();
    final ScriptContext newCtxt = new SimpleScriptContext();
    newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);

    try {
        final Object obj1 = e.eval("Object");
        final Object obj2 = e.eval("Object", newCtxt);
        Assert.assertNotEquals(obj1, obj2);
        Assert.assertNotNull(obj1);
        Assert.assertNotNull(obj2);
        Assert.assertEquals(obj1.toString(), obj2.toString());

        e.eval("x = 'hello'");
        e.eval("x = 'world'", newCtxt);
        Object x1 = e.getContext().getAttribute("x");
        Object x2 = newCtxt.getAttribute("x");
        Assert.assertNotEquals(x1, x2);
        Assert.assertEquals(x1, "hello");
        Assert.assertEquals(x2, "world");

        x1 = e.eval("x");
        x2 = e.eval("x", newCtxt);
        Assert.assertNotEquals(x1, x2);
        Assert.assertEquals(x1, "hello");
        Assert.assertEquals(x2, "world");

        final ScriptContext origCtxt = e.getContext();
        e.setContext(newCtxt);
        e.eval("y = new Object()");
        e.eval("y = new Object()", origCtxt);

        final Object y1 = origCtxt.getAttribute("y");
        final Object y2 = newCtxt.getAttribute("y");
        Assert.assertNotEquals(y1, y2);
        final Object yeval1 = e.eval("y");
        final Object yeval2 = e.eval("y", origCtxt);
        Assert.assertNotEquals(yeval1, yeval2);
        Assert.assertEquals("[object Object]", y1.toString());
        Assert.assertEquals("[object Object]", y2.toString());
    } catch (final ScriptException se) {
        se.printStackTrace();
        fail(se.getMessage());
    }
}
 

public ScriptContext getScriptContext(ScriptEngine engine)
{
	return engine.getContext();
}