Develop Reference

How to dynamically configure log directory (every request) in java util logging with helidon

I want to configure separate log directory for every request. Is this possible with helidon?

The oracle helidon JUL examples are located in github. Building off of those examples you would have to create a custom Handler to read the request from the HelidonMdc:
import io.helidon.logging.jul;
import io.helidon.logging.common;
import java.util.logging.*;
public class RequestFileHandler extends Handler {
public RequestFileHandler() {
super.setFormatter(new HelidonFormatter());
}
#Override
public synchronized void publish(LogRecord r) {
if (isLoggable(r)) {
try {
FileHandler h = new FileHandler(fileName(r), Integer.MAX_VALUE, 1, true);
try {
h.setLevel(getLevel());
h.setEncoding(getEncoding());
h.setFilter(null);
h.setFormatter(getFormatter());
h.setErrorManager(getErrorManager());
h.publish(r);
} finally {
h.close();
}
} catch (IOException | SecurityException jm) {
this.reportError(null, jm, ErrorManager.WRITE_FAILURE);
}
}
}
#Override
public void flush() {
}
#Override
public void close() {
super.setLevel(Level.OFF);
}
private String fileName(LogRecord r) {
Optional<String> o = HelidonMdc.get("name");
return o.isPresent() ? o.get() +".log" : "unknown.log";
}}
Like the example code this code is assuming that you have set the value of 'name' to the request id. You would then have to install this handler on your application logger.

RxJava error handling withought swallowing the error

I'm a little bit new to RxJava. I am trying to emit another item if onError() get called without losing the error(I still want onError() to be called on the observer). but when I'm implementing each of the error handling methods declared in the docs the error being swallowed and on error isn't being called. any solutions?
edit:
that's what I've tried to do yesterday -
#Override
public Observable<ArrayList<Address>> getAirports() {
return new Observable<ArrayList<AirportPOJO>>() {
#Override
protected void subscribeActual(Observer<? super ArrayList<AirportPOJO>> observer) {
try {
// get airports from api list and map it
ArrayList<AirportPOJO> airportsList = apiDb.getAirportsList(POJOHelper.toPOJO(AppCredentialManager.getCredentials()));
observer.onNext(airportsList);
} catch (Exception e) {
e.printStackTrace();
observer.onError(handleException(e));
}
}
}.map(AirportsMappers.getAirportsPojoToDomainAirportsMapper()).doOnNext(new Consumer<ArrayList<Address>>() {
#Override
public void accept(ArrayList<Address> airportsList) throws Exception {
// if airports loaded from api - save them to local db
if (airportsList != null) {
try {
localDb.saveAirportList(AirportsMappers.getAirportsToLocalDbAirportsMapper().apply(airportsList));
} catch (Exception e) {
e.printStackTrace();
}
}
}
}).onErrorResumeNext(new Function<Throwable, ObservableSource<? extends ArrayList<Address>>>() {
#Override
public ObservableSource<? extends ArrayList<Address>> apply(final Throwable throwable) throws Exception {
// load the local airports -
ArrayList<LocalDbAirportEntity> localAirportsEntities = localDb.getAirports();
// map
ArrayList<Address> airports = AirportsMappers.getLocalDbAirportsToAirportsMapper().apply(localAirportsEntities);
// return the concat observable with the error
return Observable.just(airports).concatWith(Observable.
<ArrayList<Address>>error(new Callable<Throwable>() {
#Override
public Throwable call() throws Exception {
return throwable;
}
}));
}
});
}
today I tought I might doing it wrong and tried -
#Override
public Observable<ArrayList<Address>> getAirports() {
ArrayList<Observable<ArrayList<Address>>> observables = new ArrayList<>();
observables.add(apiDb.getAirportsList(POJOHelper.toPOJO(AppCredentialManager.getCredentials())).map(AirportsMappers.getAirportsPojoToDomainAirportsMapper()));
observables.add(localDb.getAirports().map(AirportsMappers.getLocalDbAirportsToAirportsMapper()));
Observable<ArrayList<Address>> concatenatedObservable = Observable.concatDelayError(observables);
return concatenatedObservable;
}
but I've got the same result. the onNext() called with the data of the second observable and the onError() not being called afterwards.

Resume with the desired value concatenated with the original error:
source.onErrorResumeNext(error ->
Observable.just(item).concatWith(Observable.<ItemType>error(error))
);

Retrieve the observed value from Californium CoAP client

I am trying to implement a CoAP client based on Californium. I make this client observing to a resource:
public static class CoapCl{
double val = 0;
CoapClient client = new CoapClient("coap://localhost/Ultrasonic");
CoapObserveRelation relation = client.observe(new CoapHandler() {
#Override public void onLoad(CoapResponse response)
{
val = Double.parseDouble(response.getResponseText());
}
#Override
public void onError() {
System.out.println("Failed");
}
});
}
I want to access the value "val" from another class. How can I do it ? I tried to call a reference from the CoapCl class like this and print the value out:
CoapCl client = new CoapCl();
while(true)
{
System.out.println("Testing: " + client.val);
}
This will print all the value I get from the CoAP client, both changed and unchanged value. What should I do if I only want to get the changed value ?

Well, the issue itself isn't related to Californium and CoAP.
Except that CoapHandler is async but this is rather a strench.
Nevertheless, I'd recommend to end up with some kind of callback:
public class CoapCl {
private final Consumer<Double> valueChangedAction;
private final CoapClient client = new CoapClient("coap://localhost/Ultrasonic");
public CoapCl(Consumer<Double> valueChangedAction) {
this.valueChangedAction = valueChangedAction;
}
public void run() {
client.observe(new CoapHandler() {
#Override
public void onLoad(CoapResponse response) {
valueChangedAction.accept(
Double.parseDouble(
response.getResponseText()
)
);
}
#Override
public void onError() {
System.out.println("Failed");
}
});
}
}
new CoapCl(val -> System.out.println("Testing: " + val)).run();
Please keep in mind you have to block the main thread someway to keep the program from immediate exit.
Before, you had blocked it with your infinite loop.
Now you'll have to use System.in.read() or Thread.sleep or something else if you have no such stuff yet in your program.

JavaFX thread issue

i'm using thread to resolve the problem of GUI freeze. But with thread i'm facing a problem that i'm unable to pass format of the report as argument in run method or even with the help of constructor i'm unable to do it.....
public class BirtReportExportCon implements Runnable {
#FXML
Button exportButton;
#FXML
CheckBox pdfCheckBox;
#FXML
CheckBox xlsCheckBox;
#FXML
CheckBox docCheckBox;
#FXML
CheckBox mailCheckBox;
public String fileFormat;
Allow to Check Single CheckBox on Gui
public void eventCheckBoxPdf() {
if (pdfCheckBox.isSelected() == true) {
xlsCheckBox.setSelected(false);
docCheckBox.setSelected(false);
}
}
public void eventCheckBoxXls() {
if (xlsCheckBox.isSelected() == true) {
pdfCheckBox.setSelected(false);
docCheckBox.setSelected(false);
}
}
public void eventCheckBoxDoc() {
if (docCheckBox.isSelected() == true) {
pdfCheckBox.setSelected(false);
xlsCheckBox.setSelected(false);
}
}
Provide the Chosen fileFormat
public void onButtonClick() throws EngineException {
if (docCheckBox.isSelected() == true) {
fileFormat = "docx"; // I WANT THIS FILE FORMAT IN MY RUN METHOD
Runnable r = new BirtReportExportCon();
new Thread(r).start();
}
else if (pdfCheckBox.isSelected() == true) {
fileFormat = "pdf";
Runnable r = new BirtReportExportCon();
new Thread(r).start();
}
else if (xlsCheckBox.isSelected() == true) {
fileFormat = "xls";
Runnable r = new BirtReportExportCon();
new Thread(r).start();
}
}
Run Method
public void run()
{
try
{
exportFile(fileFormat); // HERE I WANT THAT SO I CAN ABLE TO CREATE REPORT OF REQUIRED FORMAT
}
catch (EngineException e) {
e.printStackTrace();
}
}
save report and open the report
public void exportFile(String fileFormat) throws EngineException {
String output = "output path";
String reportDesignFilePath = "report path";
try {
EngineConfig configure = new EngineConfig();
Platform.startup(configure);
IReportEngineFactory reportEngineFactory = (IReportEngineFactory) Platform
.createFactoryObject(IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
IReportEngine engine = reportEngineFactory.createReportEngine(configure);
engine.changeLogLevel(Level.WARNING);
IReportRunnable runnable = engine.openReportDesign(reportDesignFilePath);
IRunAndRenderTask task = engine.createRunAndRenderTask(runnable);
IRenderOption option = new PDFRenderOption();
option.setOutputFormat(fileFormat);
option.setOutputFileName(output + fileFormat);
task.setRenderOption(option);
task.run();
task.close();
} catch (Exception e) {
e.printStackTrace();
}
// Open Created File
File fileOpen = new File(output + fileFormat);
if (fileOpen.exists()) {
if (Desktop.isDesktopSupported()) {
try {
Desktop desktop = Desktop.getDesktop();
desktop.open(fileOpen);
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

I had a similar problem like this. I think the problem lies in the fileOpening stage. The Desktop class you are using comes from java.awt package.When you use the Desktop class then the JAVAFX thread gets blocked as commented by a user in the link given at the bottom of this answer. But the user has a low reputation (only 11)so we cannot rely on him.
To make your application unfreeze, you will have to create a new Thread.
Here is a part of my code, i used in my application and this code worked perfectly. I have also put a link to a github issue of my application where i stated the freezing problem, similar to yours. The issue was created 2 days ago.
#FXML
void openWithAction(ActionEvent event) {
boolean flag = false;
Task task = new Task<Void>() {
#Override
protected Void call() throws Exception {
try {
Desktop.getDesktop().open(new File(fileModel.getFileLocation()));
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
};
new Thread(task).start();
}
Github issue link:
https://github.com/karanpant/SearchEverything/issues/3
I also suggest you to use concurrency provided by JavaFX.
Here is the other SO post link. Hope this helps.
JavaFX Freeze on Desktop.open(file), Desktop.browse(uri)
EDIT: I am sorry if i don't understand your question . Is your question about application freezing or about not being able to pass a parameter or about not being able to pass a parameter because of application freezing.

Try something like this:
if ( docCheckBox.isSelected() == true ) {
BirtReportExportCon r = new BirtReportExportCon();
r.fileFormat = "docx"; // I WANT THIS FILE FORMAT IN MY RUN METHOD
new Thread(r).start();
}

You should run this code on the Swing thread instead of calling it from the Java FX thread. Like the following:
#FXML
void openWithAction(ActionEvent event) {
SwingUtilities.invokeLater( () -> Desktop.getDesktop().
open(new File(fileModel.
getFileLocation())));
}

"A connector with id is already registered! " in vaadin

I would like to fix the issue which is solved in this posting:
Vaadin "A connector with id xy is already registered"
When I add the following code to MyUI I get an error in the getLogger() lline: "The method getLogger() from the type ConnectorTracker is not visible"
public class SomeUI extends UI {
private ConnectorTracker tracker;
#
Override
public ConnectorTracker getConnectorTracker() {
if (this.tracker == null) {
this.tracker = new ConnectorTracker(this) {
#
Override
public void registerConnector(ClientConnector connector) {
try {
super.registerConnector(connector);
} catch (RuntimeException e) {
getLogger().log(Level.SEVERE, "Failed connector: {0}", connector.getClass().getSimpleName());
throw e;
}
}
};
}
return tracker;
}
}
Is there a quick work around for this or any other solution how to fix the xy connector exception?
I am using spring boot with vaadin 7.

The getLogger() method is private, and you are implementing an anonymous subtype, which can only access public and protected methods. You can easily add your own getLogger to your UI subclass:
private static Logger getLogger() {
return Logger.getLogger(SomeUI.class.getName());
}
private ConnectorTracker connectorTracker;
#Override
public ConnectorTracker getConnectorTracker() {
if (connectorTracker == null) {
connectorTracker = new ConnectorTracker(this) {
#Override
public void registerConnector(ClientConnector connector) {
try{
super.registerConnector(connector);
} catch (RuntimeException e) {
getLogger().log(Level.SEVERE, "OOPS!");
throw e;
}
}
};
}
return connectorTracker;
}

To fix the a connector xy is already registered problem you need to check if any of your Components(Views, Layouts, Buttons, Panels, whatever...) are added to a view more than once.
So if a Layout is created with new VerticalLayout() there is no way to reuse it.
Meaning you should check all your Vaadin components and your own Views/UI-Components if they are used twice or if some of them are static.