javax.script.Invocable Java Examples

public static void main(final String[] args) throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine engine = manager.getEngineByName("nashorn");

    // JavaScript code in a String
    final String script = "function hello(name) { print('Hello, ' + name); }";
    // evaluate script
    engine.eval(script);

    // javax.script.Invocable is an optional interface.
    // Check whether your script engine implements or not!
    // Note that the JavaScript engine implements Invocable interface.
    final Invocable inv = (Invocable) engine;

    // invoke the global function named "hello"
    inv.invokeFunction("hello", "Scripting!!" );
}
 

/**
 * Invokes the UDF with specified data.
 *
 * @param data data to pass to the invocable function
 * @return The data transformed by the UDF in String format
 */
@Nullable
public String invoke(String data) throws ScriptException, IOException, NoSuchMethodException {
  Invocable invocable = getInvocable();
  if (invocable == null) {
    throw new RuntimeException("No udf was loaded");
  }

  Object result = getInvocable().invokeFunction(functionName(), data);
  if (result == null || ScriptObjectMirror.isUndefined(result)) {
    return null;

  } else if (result instanceof String) {
    return (String) result;

  } else {
    String className = result.getClass().getName();
    throw new RuntimeException(
        "UDF Function did not return a String. Instead got: " + className);
  }
}
 

@Test
/**
 * Check that invokeMethod throws NoSuchMethodException on missing method.
 */
public void invokeMethodMissingTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        final Object obj = e.eval("({})");
        ((Invocable) e).invokeMethod(obj, "nonExistentMethod");
        fail("should have thrown NoSuchMethodException");
    } catch (final Exception exp) {
        if (!(exp instanceof NoSuchMethodException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Override
protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
		HttpServletResponse response) throws Exception {

	try {
		ScriptEngine engine = getEngine();
		Invocable invocable = (Invocable) engine;
		String url = getUrl();
		String template = getTemplate(url);

		Object html;
		if (this.renderObject != null) {
			Object thiz = engine.eval(this.renderObject);
			html = invocable.invokeMethod(thiz, this.renderFunction, template, model, url);
		}
		else {
			html = invocable.invokeFunction(this.renderFunction, template, model, url);
		}

		response.getWriter().write(String.valueOf(html));
	}
	catch (ScriptException ex) {
		throw new ServletException("Failed to render script template", new StandardScriptEvalException(ex));
	}
}
 

@Test
/**
 * Check that invokeFunction calls functions only from current context's
 * Bindings.
 */
public void invokeFunctionDifferentContextTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        // define an object with method on it
        e.eval("function hello() { return 'Hello World!'; }");
        final ScriptContext ctxt = new SimpleScriptContext();
        ctxt.setBindings(e.createBindings(), ScriptContext.ENGINE_SCOPE);
        // change engine's current context
        e.setContext(ctxt);

        ((Invocable) e).invokeFunction("hello"); // no 'hello' in new context!
        fail("should have thrown NoSuchMethodException");
    } catch (final Exception exp) {
        if (!(exp instanceof NoSuchMethodException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Tests whether invocation of a JavaScript method through a variable arity
 * Java method will pass the vararg array. Both non-vararg and vararg
 * JavaScript methods are tested.
 *
 * @throws ScriptException
 */
public void variableArityInterfaceTest() throws ScriptException {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");
    e.eval(
            "function test1(i, strings) {"
            + "    return 'i == ' + i + ', strings instanceof java.lang.String[] == ' + (strings instanceof Java.type('java.lang.String[]')) + ', strings == ' + java.util.Arrays.toString(strings)"
            + "}"
            + "function test2() {"
            + "    return 'arguments[0] == ' + arguments[0] + ', arguments[1] instanceof java.lang.String[] == ' + (arguments[1] instanceof Java.type('java.lang.String[]')) + ', arguments[1] == ' + java.util.Arrays.toString(arguments[1])"
            + "}");
    final VariableArityTestInterface itf = ((Invocable) e).getInterface(VariableArityTestInterface.class);
    Assert.assertEquals(itf.test1(42, "a", "b"), "i == 42, strings instanceof java.lang.String[] == true, strings == [a, b]");
    Assert.assertEquals(itf.test2(44, "c", "d", "e"), "arguments[0] == 44, arguments[1] instanceof java.lang.String[] == true, arguments[1] == [c, d, e]");
}
 

@Test
/**
 * Check that getInterface on non-script object 'thiz' results in
 * IllegalArgumentException.
 */
public void getInterfaceNonScriptObjectThizTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        ((Invocable) e).getInterface(new Object(), Runnable.class);
        fail("should have thrown IllegalArgumentException");
    } catch (final Exception exp) {
        if (!(exp instanceof IllegalArgumentException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Check that invokeMethod throws NPE on null method name.
 */
public void invokeMethodNullNameTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        final Object obj = e.eval("({})");
        ((Invocable) e).invokeMethod(obj, null);
        fail("should have thrown NPE");
    } catch (final Exception exp) {
        if (!(exp instanceof NullPointerException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
public void returnArrayInJS() throws Exception {
    Object fn = engine.eval("(function(obj) {\n"
            + "  return [ 1, 2, 'a', Math.PI, obj ];\n"
            + "})\n");
    assertNotNull(fn);

    Sum sum = new Sum();
    Object raw = ((Invocable) engine).invokeMethod(fn, "call", null, sum);

    ArrayLike res = ((Invocable) engine).getInterface(raw, ArrayLike.class);
    if (res == null) {
        assumeNotNashorn();
    }
    assertNotNull("Result looks like array", res);

    List<?> list = ((Invocable) engine).getInterface(raw, List.class);
    assertEquals("Length of five", 5, list.size());
    assertEquals(1, list.get(0));
    assertEquals(2, list.get(1));
    assertEquals("a", list.get(2));
    assertEquals(Math.PI, list.get(3));
    assertEquals(sum, list.get(4));
}
 

@Test
/**
 * check that null function name results in NPE.
 */
public void invokeFunctionNullNameTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        ((Invocable)e).invokeFunction(null);
        fail("should have thrown NPE");
    } catch (final Exception exp) {
        if (!(exp instanceof NullPointerException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

public static void main(final String[] args) throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine engine = manager.getEngineByName("nashorn");

    // JavaScript code in a String
    final String script = "function run() { print('run called'); }";

    // evaluate script
    engine.eval(script);

    final Invocable inv = (Invocable) engine;

    // get Runnable interface object from engine. This interface methods
    // are implemented by script functions with the matching name.
    final Runnable r = inv.getInterface(Runnable.class);

    // start a new thread that runs the script implemented
    // runnable interface
    final Thread th = new Thread(r);
    th.start();
    th.join();
}
 

@Test
/**
 * Check that calling method on non-script object 'thiz' results in
 * IllegalArgumentException.
 */
public void invokeMethodNonScriptObjectThizTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        ((Invocable) e).invokeMethod(new Object(), "toString");
        fail("should have thrown IllegalArgumentException");
    } catch (final Exception exp) {
        if (!(exp instanceof IllegalArgumentException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Check that invokeMethod throws NoSuchMethodException on missing method.
 */
public void invokeMethodMissingTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        final Object obj = e.eval("({})");
        ((Invocable) e).invokeMethod(obj, "nonExistentMethod");
        fail("should have thrown NoSuchMethodException");
    } catch (final Exception exp) {
        if (!(exp instanceof NoSuchMethodException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Check that attempt to call missing function results in
 * NoSuchMethodException.
 */
public void invokeFunctionMissingTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        ((Invocable)e).invokeFunction("NonExistentFunc");
        fail("should have thrown NoSuchMethodException");
    } catch (final Exception exp) {
        if (!(exp instanceof NoSuchMethodException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Override
public boolean match(List<GrpcURL> providerUrls) {
  String rule = super.getRule();
  try {
    engine.eval(super.getRule());
    Invocable invocable = (Invocable) engine;
    GrpcURL refUrl = super.getRefUrl();
    Object obj = invocable.invokeFunction("route", refUrl, providerUrls);
    if (obj instanceof Boolean) {
      return (Boolean) obj;
    } else {
      return true;
    }
  } catch (ScriptException | NoSuchMethodException e) {
    log.error("route error , rule has been ignored. rule: " + rule + ", url: " + providerUrls, e);
    return true;
  }
}
 

public void act(MapleClient c, MapleReactor reactor) {
    try {
        Invocable iv = getInvocable("reactors/" + reactor.getReactorId() + ".js", c);
        if (iv == null) {
            if (c.getPlayer().isShowPacket()) {
                c.getPlayer().dropMessage(5, "未找到 反应堆 文件中的 " + reactor.getReactorId() + ".js 文件.");
            }
            FileoutputUtil.log(FileoutputUtil.Reactor_ScriptEx_Log, "未找到 反应堆 文件中的 " + reactor.getReactorId() + ".js 文件.");
            return;
        }
        ScriptEngine scriptengine = (ScriptEngine) iv;
        ReactorActionManager rm = new ReactorActionManager(c, reactor);

        scriptengine.put("rm", rm);
        iv.invokeFunction("act", new Object[0]);
    } catch (ScriptException | NoSuchMethodException e) {
        System.err.println("执行反应堆文件出错 反应堆ID: " + reactor.getReactorId() + ", 反应堆名称: " + reactor.getName() + " 错误信息: " + e);
        FileoutputUtil.log(FileoutputUtil.Reactor_ScriptEx_Log, "执行反应堆文件出错 反应堆ID: " + reactor.getReactorId() + ", 反应堆名称: " + reactor.getName() + " 错误信息: " + e);
    }
}
 

public static void main(final String[] args) throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine engine = manager.getEngineByName("nashorn");

    // JavaScript code in a String
    final String script = "var obj = new Object(); obj.run = function() { print('run method called'); }";

    // evaluate script
    engine.eval(script);

    // get script object on which we want to implement the interface with
    final Object obj = engine.get("obj");

    final Invocable inv = (Invocable) engine;

    // get Runnable interface object from engine. This interface methods
    // are implemented by script methods of object 'obj'
    final Runnable r = inv.getInterface(obj, Runnable.class);

    // start a new thread that runs the script implemented
    // runnable interface
    final Thread th = new Thread(r);
    th.start();
    th.join();
}
 

public static void main(final String[] args) throws Exception {
    final ScriptEngineManager manager = new ScriptEngineManager();
    final ScriptEngine engine = manager.getEngineByName("nashorn");

    // JavaScript code in a String. This code defines a script object 'obj'
    // with one method called 'hello'.
    final String script = "var obj = new Object(); obj.hello = function(name) { print('Hello, ' + name); }";
    // evaluate script
    engine.eval(script);

    // javax.script.Invocable is an optional interface.
    // Check whether your script engine implements or not!
    // Note that the JavaScript engine implements Invocable interface.
    final Invocable inv = (Invocable) engine;

    // get script object on which we want to call the method
    final Object obj = engine.get("obj");

    // invoke the method named "hello" on the script object "obj"
    inv.invokeMethod(obj, "hello", "Script Method !!" );
}
 

@Test
/**
 * Check that invokeMethod throws NPE on null method name.
 */
public void invokeMethodNullNameTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        final Object obj = e.eval("({})");
        ((Invocable) e).invokeMethod(obj, null);
        fail("should have thrown NPE");
    } catch (final Exception exp) {
        if (!(exp instanceof NullPointerException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
public void invokeFunctionInGlobalScopeTest() throws Exception {
     final ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
     final ScriptContext ctxt = engine.getContext();

     // define a function called "func"
     engine.eval("func = function() { return 42 }");

     // move ENGINE_SCOPE Bindings to GLOBAL_SCOPE
     ctxt.setBindings(ctxt.getBindings(ScriptContext.ENGINE_SCOPE), ScriptContext.GLOBAL_SCOPE);

     // create a new Bindings and set as ENGINE_SCOPE
     ctxt.setBindings(engine.createBindings(), ScriptContext.ENGINE_SCOPE);

     // define new function that calls "func" now in GLOBAL_SCOPE
     engine.eval("newfunc = function() { return func() }");

     // call "newfunc" and check the return value
     Object value = ((Invocable)engine).invokeFunction("newfunc");
     assertTrue(((Number)value).intValue() == 42);
}
 

@Test
/**
 * Check that calling method on non-script object 'thiz' results in
 * IllegalArgumentException.
 */
public void invokeMethodNonScriptObjectThizTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        ((Invocable) e).invokeMethod(new Object(), "toString");
        fail("should have thrown IllegalArgumentException");
    } catch (final Exception exp) {
        if (!(exp instanceof IllegalArgumentException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Check that we can call invokeMethod on an object that we got by
 * evaluating script with different Context set.
 */
public void invokeMethodDifferentContextTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        // define an object with method on it
        final Object obj = e.eval("({ hello: function() { return 'Hello World!'; } })");

        final ScriptContext ctxt = new SimpleScriptContext();
        ctxt.setBindings(e.createBindings(), ScriptContext.ENGINE_SCOPE);
        e.setContext(ctxt);

        // invoke 'func' on obj - but with current script context changed
        final Object res = ((Invocable) e).invokeMethod(obj, "hello");
        assertEquals(res, "Hello World!");
    } catch (final Exception exp) {
        exp.printStackTrace();
        fail(exp.getMessage());
    }
}
 

/**
 * Executes a compiled script and returns the result.
 *
 * @param script Compiled script.
 * @param functionName Optional function or method to invoke.
 * @param scriptContext Script execution context.
 * @return The script result.
 * @throws IllegalArgumentException
 */
public static Object executeScript(CompiledScript script, String functionName, ScriptContext scriptContext, Object[] args) throws ScriptException, NoSuchMethodException {
    Assert.notNull("script", script, "scriptContext", scriptContext);
    Object result = script.eval(scriptContext);
    if (UtilValidate.isNotEmpty(functionName)) {
        if (Debug.verboseOn()) {
            Debug.logVerbose("Invoking function/method " + functionName, module);
        }
        ScriptEngine engine = script.getEngine();
        try {
            Invocable invocableEngine = (Invocable) engine;
            result = invocableEngine.invokeFunction(functionName, args == null ? EMPTY_ARGS : args);
        } catch (ClassCastException e) {
            throw new ScriptException("Script engine " + engine.getClass().getName() + " does not support function/method invocations");
        }
    }
    return result;
}
 

@Override
protected String renderInternal(Map<String, Object> model) throws Exception {
    SimpleBindings bindings = new SimpleBindings(model);
    Object result;
    if (renderFunction == null && renderObject == null) {
        // result of script is the response, no method is invoked and the model attributes are bounded globally
        result = scriptEngine.eval(script, bindings);
    } else {
        if (renderObject != null) {
            Object thiz = scriptEngine.eval(renderObject);
            result = ((Invocable) scriptEngine).invokeMethod(thiz, renderFunction, bindings);
        } else {
            result = ((Invocable) scriptEngine).invokeFunction(renderFunction, bindings);
        }
    }

    return toJson(result);
}
 

@Test
/**
 * Check that attempt to call missing function results in
 * NoSuchMethodException.
 */
public void invokeFunctionMissingTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        ((Invocable)e).invokeFunction("NonExistentFunc");
        fail("should have thrown NoSuchMethodException");
    } catch (final Exception exp) {
        if (!(exp instanceof NoSuchMethodException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Check that calling method on null 'thiz' results in
 * IllegalArgumentException.
 */
public void invokeMethodNullThizTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine e = m.getEngineByName("nashorn");

    try {
        ((Invocable) e).invokeMethod(null, "toString");
        fail("should have thrown IllegalArgumentException");
    } catch (final Exception exp) {
        if (!(exp instanceof IllegalArgumentException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Check that calling method on mirror created by another engine results in
 * IllegalArgumentException.
 */
public void invokeMethodMixEnginesTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine engine1 = m.getEngineByName("nashorn");
    final ScriptEngine engine2 = m.getEngineByName("nashorn");

    try {
        final Object obj = engine1.eval("({ run: function() {} })");
        // pass object from engine1 to engine2 as 'thiz' for invokeMethod
        ((Invocable) engine2).invokeMethod(obj, "run");
        fail("should have thrown IllegalArgumentException");
    } catch (final Exception exp) {
        if (!(exp instanceof IllegalArgumentException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

@Test
/**
 * Check that calling method on mirror created by another engine results in
 * IllegalArgumentException.
 */
public void invokeMethodMixEnginesTest() {
    final ScriptEngineManager m = new ScriptEngineManager();
    final ScriptEngine engine1 = m.getEngineByName("nashorn");
    final ScriptEngine engine2 = m.getEngineByName("nashorn");

    try {
        final Object obj = engine1.eval("({ run: function() {} })");
        // pass object from engine1 to engine2 as 'thiz' for invokeMethod
        ((Invocable) engine2).invokeMethod(obj, "run");
        fail("should have thrown IllegalArgumentException");
    } catch (final Exception exp) {
        if (!(exp instanceof IllegalArgumentException)) {
            exp.printStackTrace();
            fail(exp.getMessage());
        }
    }
}
 

public String resolve(String mcgWebScoketCode, String httpSessionId, String flowId, String script, JSON param) throws ScriptException, NoSuchMethodException {
	if(StringUtils.isNotEmpty(script)) {
		script = script.replace("console.info(", "console.info(\"" + mcgWebScoketCode + "\", \"" + httpSessionId + "\", \"" + flowId + "\", ")
				.replace("console.success(", "console.success(\"" + mcgWebScoketCode + "\", \"" + httpSessionId + "\", \"" + flowId + "\", ")
				.replace("console.error(", "console.error(\"" + mcgWebScoketCode + "\", \"" + httpSessionId + "\", \"" + flowId + "\", ");
	}
	String dataJson = null;
    ScriptEngineManager scriptEngineManager = new ScriptEngineManager();  
    ScriptEngine engine = scriptEngineManager.getEngineByName("nashorn");
	engine.eval(script);
    Invocable invocable = (Invocable) engine;
    Object result = invocable.invokeFunction("main", param);
    
    dataJson = JSON.toJSONString(result);
    return dataJson;
}
 

public static void main(String[] args) throws Exception {
    System.out.println("\nTest8\n");
    ScriptEngineManager m = new ScriptEngineManager();
    ScriptEngine e  = Helper.getJsEngine(m);
    if (e == null) {
        System.out.println("Warning: No js engine found; test vacuously passes.");
        return;
    }
    e.eval(new FileReader(
        new File(System.getProperty("test.src", "."), "Test8.js")));
    Invocable inv = (Invocable)e;
    inv.invokeFunction("main", "Mustang");
    // use method of a specific script object
    Object scriptObj = e.get("scriptObj");
    inv.invokeMethod(scriptObj, "main", "Mustang");
}