I am trying to call a java method from within my JSNI method. I am not getting any type of error but the Window.alert() never gets called.
package com.mywebsite.myapp.client;
public class MyApp implements EntryPoint(){
/// Other stuff....
public native void getToServer(String trainerName)/*-{
$wnd.$.get( "http://testdastuff.dev/trainerstats", { trainer: trainerName} )
.fail(function() {
$wnd.console.log("error");
})
.done(function( data ) {
if(data == "noData"){
alert("NO DATA");
this.#com.mywebsite.myapp.client.MyApp::testJSNI()();
}
});
}-*/;
public void testJSNI(){
Window.alert("Working");
}
}
It is alerting "NO DATA" so i know something is wrong with the way I am calling the method. It cant be a static method.
Inside of the done callback you will have lost this (it will point to something else now).
You need to preserve it via bind or a local variable (var self = this).
Related
I have a problem with sending email with method annotated as #Async.
Firstly, I am not sure if it is possible to work as I want so I need help with explanation.
Here is what am doing now:
In main method i have annotation
#EnableAsync(proxyTargetClass = true)
Next I have AsyncConfig class
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurerSupport;
import java.util.concurrent.Executor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
#Configuration
public class AsyncConfig extends AsyncConfigurerSupport {
#Override
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(2);
executor.setMaxPoolSize(2);
executor.setQueueCapacity(500);
executor.setThreadNamePrefix("email-");
executor.initialize();
return executor;
}
}
Of course, its rest application so i have controller, service etc, looks normally, nothing special
My async method looks like this:
#Async
public void sendEmail() throws InterruptedException {
log.info("Sleep");
Thread.sleep(10000L);
//method code
log.info("Done");
}
I executing this method in another service method:
#Override
public boolean sendSystemEmail() {
try {
this.sendEmail();
} catch (InterruptedException e) {
e.printStackTrace();
}
log.info("pending sendEmail method");
return true;
}
Now what I want archive is to ignore executing sendEmail() function and execute return true; meanwhile function sendEmail() will be executing in another Thread. Of course it doesn't work now as I want. Unfortunately.
Note that I am new into async programming, so I have lack of knowledge in some parts of this programming method.
Thanks for any help.
First – let’s go over the rules – #Async has two limitations:
it must be applied to public methods only
self-invocation – calling the async method from within the same class – won’t work
The reasons are simple – the method needs to be public so that it can be proxied. And self-invocation doesn’t work because it bypasses the proxy and calls the underlying method directly.
http://www.baeldung.com/spring-async
I execute a TestNG test using a dataProvider.
So I set the testName via #BeforeMethod and I override getTestName().
This works so far, but it seems TestNG is calling the test's getTestName in the beginning
before it starts. This happens when an exception was thrown during configuration, so the #BeforeMethod is not executed and therefore my test name is null.
Is there anyway to call the original method, the one that would have been called if I would not have overwritten it :D since I implement an interface an do not extend from another class I cannot use super.getTestName().
Any way to solve this may be?
#Test(groups = {TestGroups.READY}, description = "check help on each tab")
public class HelpTest extends TestControl implements ITest {
// overriding to return my individual testname, but is null at the beginning
#Override
public String getTestName() {
return TestControl.getCurrentTestName();
}
#DataProvider(name = "tabs")
public Iterator<Object[]> tabs() {
Set<Object[]> list = new LinkedHashSet<Object[]>();
for (Tab tab : Tab.values()) {
list.add(new Object[]{tab});
}
return list.iterator();
}
// before the test below starts, i set my individual testname
#BeforeMethod
public void setTestName(Method method, Object[] testData) {
TestControl.setCurrentTestName(method.getName() + "_" + StringUtils.capitalize(testData[0].toString().toLowerCase()));
}
// executing the test with the given data provider
#Test(dataProvider = "tabs")
public void testHelpSites(Tab tab) throws Exception {
TestActions.goTab(tab).callHelp(tab).checkHelp();
}
}
I guess I figured it out, I also use a TestReporter via AbstractWebDriverEventListener and ITestListener and on its onTestStart(ITestResult result) it's calling the test's name and that's the source of the call before the #BeforeMethod call.
I solved it by checking if result.getName() is null, which calls the test's getTestName() if it implements ITest and if it's null I use the original name from result.getMethod.getMethodName(). Not pretty, but rare :D
I could solve this problem using ITestNGMethod testng class.
ITestNGMethod method = result.getMethod(); // result is ITestResult Object
method.getMethodName(); // This will return method name.
My complete method here:
#Override
public void onTestSuccess(ITestResult result) {
ITestNGMethod method = result.getMethod();
String message = "Test Execution is Successful:"+method.getMethodName();
}
Hope this helps
In my RestController which extends AbstractRestfulController, I can get the route params in the implemented functions such as...
public function create($data)
{
$entity = $this->params()->fromRoute('entity');
}
... but when I do the same in the constructor like this
public function __construct()
{
$entity = $this->params()->fromRoute('entity');
}
I get Call to a member function getParam() on a non-object.
Why is that? How can I get the route parameters in the constructor?
What I am trying to do
Since I'm trying to create a generic controller, there is a part of the restful route that is shared for all actions (resp. verbs). The entity for which the request is made. I'd like to store this in a class parameter for convenience.
Normally you'd write a method to proxy to whatever value you need, and just call that method, it's only a little more expensive to call $this->getEntity() than it is to call $this->entity, which, as far as I can tell is the stated aim
class RestController
{
protected $entity;
public function getEntity()
{
if (!$this->entity) {
$this->entity = $this->params()->fromRoute('entity');
}
return $this->entity;
}
}
If you really do want to pre-populate the entity property, the simplest method is to use an initializer, and move the code from your __constructor to init(). Have your controller implement \Zend\Stdlib\InitializableInterface
use Zend\Stdlib\InitializableInterface;
class RestController extends AbstractRestfulController implements InitializableInterface
{
protected $entity;
public function init() {
$this->entity = $this->params()->fromRoute('entity');
}
}
Add an initializer to the controller loader in your module boostrap
use Zend\Stdlib\InitializableInterface;
class Module
{
public function onBootstrap(MvcEvent $e)
$sm = $e->getApplication()->getServiceManager();
$controllers = $sm->get('ControllerLoader');
$controllers->addInitializer(function($controller, $cl) {
if ($controller instanceof InitializableInterface) {
$controller->init();
}
}, false); // false tells the loader to run this initializer after all others
}
}
That would not make any sense as the route is matched to a particular action.
You can't route to a constructor, therefore how could you get route parameters there?
If you give an idea of what you are trying to do then I could suggest a better/nicer way to do it
My problem is that in the main class I have some osgi references that work just fine when the class is call. But after that all the references became null. When I close the main windows and call shutdown method, the hubService reference returns null. What do I do wrong here?
private void shutdown() {
if(hubService == null) {
throw new NullPointerException();
}
hubService.shutdownHub(); // why is hubService null?
}
// bind hub service
public synchronized void setHubService(IHubService service) {
hubService = service;
try {
hubService.startHub(PORT, authenticationHandler);
} catch (Exception e) {
JOptionPane.showMessageDialog(mainFrame, e.toString(), "Server", JOptionPane.ERROR_MESSAGE);
System.exit(0);
}
}
// remove hub service
public synchronized void unsetHubService(IHubService service) {
hubService.shutdownHub();
hubService = null;
}
If a field can be read and written by multiple threads, you must protect access to read as well as write. Your first method, shutdown, does not protect the read of hubService so that the value of hubService can change between the first read and the second read. You don't show the declaration of the hubService field. You could make it volatile or only read when synchronized (on the same object used to synchronized when writing the field). Then your shutdown implementation could look like:
private volatile IHubService hubService;
private void shutdown() {
IHubService service = hubService; // make a copy of the field in a local variable
if (service != null) // use local var from now on since the field could have changed
service.shutdownHub();
}
I assume your shutdown method is the DS deactivate method? If so, why do you shutdown in the unset method as well in the shutdown method?
Overall the design does not seem very sound. The IHubService is used as a factory and should return some object that is then closed in the deactivate method. You made the IHubService effectively a singleton. Since it must come from another bundle, it should handle its life cycle itself.
Since you also do not use annotations, it is not clear if your set/unset methods are static/dynamic and/or single/multiple. The following code should not have your problems (exammple code with bnd annotations):
#Component public class MyImpl {
IHubService hub;
#Activate
void activate() {
hubService.startHub(PORT, authenticationHandler);
}
#DeActivate
void deactivate() {
hubService.shutdown();
}
#Reference
void setHub(IHubService hub) { this.hub = hub; }
}
I'm very new to Java which is required for a Blackberry App development project (which is what I'm doing now). My issue is that I am trying to use this class I found online (attached below) to implement a notification feature in my application. As I said I'm extremely new to Java so I don't know how to call the setVisible1 from another class, say UserInterface. I have tried MyAppIndicator._indicator.setVisible1(true,1); but this produces an error of:
"The method setVisible1(boolean, int) is undefined for the type ApplicationIndicator".
Any help would be appreciated. Thanks!
public class MyAppIndicator
{
public ApplicationIndicator _indicator;
public static MyAppIndicator _instance;
private MyAppIndicator () {}
public static MyAppIndicator getInstance() {
if (_instance == null) {
_instance = new MyAppIndicator ();
}
return(_instance);
}
public void setupIndicator() {
//Setup notification
if (_indicator == null) {
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance();
_indicator = reg.getApplicationIndicator();
if(_indicator == null) {
ApplicationIcon icon = new ApplicationIcon(EncodedImage.getEncodedImageResource ("status_icon_24x24.png"));
_indicator = reg.register(icon, false, true);
_indicator.setValue(0);
_indicator.setVisible(false);
}
}
}
public void setVisible1 (boolean visible, int count) {
if (_indicator != null) {
if (visible) {
_indicator.setVisible(true);
_indicator.setValue(count);
} else {
_indicator.setVisible(false);
}
}
}
}
In order to call methods from Classes in Java, you need instance of the class (or if the class is 'static' you can directly use the methods, as 'static' basically means only 1 instance).
In your case MyAppIndicator implements Singleton:
public static MyAppIndicator _instance;
private MyAppIndicator () {};
public static MyAppIndicator getInstance() {
if (_instance == null) {
_instance = new MyAppIndicator ();
}
return(_instance);
}
This means that when you call getInstance() it will return instance of MyAppIndicator
if such an instance already exists, or it will create a new one, if there's no instance.
After acquiring an instance of a class, you simply call it's methods, if they have the appropriate access modifiers. In your case setVisible1 has access modifier 'public' so you will be able to call it outside of MyAppIndicator.
So in code:
a) acquiring instance:
MyAppIndicator instanceOfMyAppIndicator = MyAppIndicator.getInstance();
b) calling the method:
instanceOfMyAppIndicator.setVisible1(true,1);
Looking at the above code, you should call
MyAppIndicator.getInstance().setVisible1(true,1);
than
MyAppIndicator._indicator.setVisible1(true,1);
You can do the following:
MyAppIndicator myAppIndicator = MyAppIndicator.getInstance();
myAppIndicator.setVisible1(true,1);
boolean visible = ...; // you need to set something here
int count = ...; // you need to set something, here
MyAppIndicator mai = MyAppIndicator.getInstance();
mai.setVisible1(visible, count);
setVisible1() is is a regular, public method, so any other class can invoke the method on an instance of the MyAppIndicator class.
you need to pass the same number & type of arguments to setVisible1() as are in its definition. The definition reads setVisible1(boolean visible, int count), so you need to pass a boolean and an integer. Java convention is that passing "true" will likely make the indicator visible, and "false" will hide it. The int is unusual, but reading the code it's ignored, so pass whatever you want.
to get an instance of a class, you normally write new ClassName. However, MyAppIndicator declares the constructor as private, so other classes cannot invoke it. Instead, myAppIndicator provides a getInstance() method that will handle object construction for you.
You should also read the Java Tutorial - they've got a far better description of all this.