Java Code Examples for com.google.gwt.core.client.GWT

public void loadMainDocument(String url) {
    if (mode == DataSourceManagerMode.LOADING_ASSESSMENT || mode == DataSourceManagerMode.LOADING_ITEMS || "".equals(url)) {
        return;
    }

    mode = DataSourceManagerMode.LOADING_ASSESSMENT;

    String resolvedURL;

    resolvedURL = PathUtil.resolvePath(url, GWT.getHostPageBaseURL());

    new eu.ydp.empiria.player.client.util.file.xml.XmlDocument(resolvedURL, new DocumentLoadCallback<Document>() {

        @Override
        public void finishedLoading(Document document, String baseURL) {
            assesmentXML = new XmlData(document, baseURL);
            assessmentDataManager.initializeAssessmentData(assesmentXML);
        }

        @Override
        public void loadingError(String error) {
            assessmentDataManager.setAssessmentLoadingError(error);
            onLoadFinished();
        }
    });
}
 

public void testParseResponseFromNodeTest() {
    ResponseNodeJAXBParserFactory responseNodeJAXBParserFactory = GWT.create(ResponseNodeJAXBParserFactory.class);

    responseNodeParser = new ResponseNodeParser(responseNodeJAXBParserFactory, new ResponseBeanConverter());

    Response response = responseNodeParser.parseResponseFromNode(getResponseDeclaration());

    assertEquals(response.cardinality, Cardinality.MULTIPLE);
    assertEquals(response.identifier, "CONNECTION_RESPONSE_1");
    assertEquals(response.evaluate, Evaluate.CORRECT);
    assertEquals(response.cardinality, Cardinality.MULTIPLE);
    assertEquals(response.getCheckMode(), CheckMode.EXPRESSION);
    assertEquals(3, response.correctAnswers.getAllAnswers().size());
    assertEquals(response.correctAnswers.getAllAnswers().get(0), "CONNECTION_RESPONSE_1_0 CONNECTION_RESPONSE_1_1");
    assertEquals(response.correctAnswers.getAllAnswers().get(1), "CONNECTION_RESPONSE_1_0 CONNECTION_RESPONSE_1_2");
    assertEquals(response.correctAnswers.getAllAnswers().get(2), "CONNECTION_RESPONSE_1_3 CONNECTION_RESPONSE_1_4");
    assertEquals(response.getID(), "CONNECTION_RESPONSE_1"); // checkMode
    assertEquals(response.getAppropriateCountMode(), CountMode.SINGLE);
    assertEquals(response.groups.get(0), "x1");
    assertEquals(response.groups.get(1), "x2");
}
 

public void onModuleLoad() {
	ScriptInjector.fromUrl(GWT.getModuleBaseURL()+"bower_components/webcomponents-lite.min.js").setWindow(ScriptInjector.TOP_WINDOW).setCallback(
               new Callback<Void, Exception>() {
                   @Override
                   public void onSuccess(Void result) {
					LOGGER.info("injection success");
					importPolymer();
				}

				@Override
				public void onFailure(Exception reason) {

				}
			}).inject();


	LOGGER.info("Initializing Layout client UI module ...");
	new ModuleConfigurator().configureModule(new LayoutUIModuleConfiguration());
}
 

@AfterInitialization
public void afterInitialization() {
    authenticationServiceCaller.call(new RemoteCallback<User>() {
        @Override
        public void callback(User user) {
            Label userLabel = new Label(
                    "User logged in: username=" + user.getIdentifier() + ", roles=" + user.getRoles());
            RootPanel.get().add(userLabel);
            SimplePanel panel = new SimplePanel();
            Anchor logoutLink = new Anchor("Spring Security Logout URL", GWT.getHostPageBaseURL() + "logout");
            panel.add(logoutLink);
            RootPanel.get().add(panel);
            initBtns();
        }
    }).getUser();
}
 

public GeoprocessComboBox(Collection<Geoprocess> spatialOperations) {
	super(new ListStore<Geoprocess>(
			((GeoprocessProperties)GWT.create(GeoprocessProperties.class)).key()),
			((GeoprocessProperties)GWT.create(GeoprocessProperties.class)).name());
	initialize();
	getStore().addAll(spatialOperations);
}
 

/**
 * Injects ChartJS if not injected yet.
 */
static void ensureInjected() {
	if (!injected) {
		// gets resource
		Resources res = GWT.create(Resources.class);
		// gets source of ChartJS
		String source = res.chartJsSource().getText();
		// creates a script element
		ScriptElement scriptElement = Document.get().createScriptElement();
		// sets ID
		scriptElement.setId(CHART_JS_SCRIPT_ELEMENT_ID);
		// sets the script content with ChartJS source
		scriptElement.setInnerText(source);
		// appends to the body
		Document.get().getBody().appendChild(scriptElement);
		injected = true;
	}
}
 

/**
 * TODO: query the programs by users
 *
 * @param userEmail used to filter myDatasets
 */
public static DatasetTree load(final String userEmail) {
	final DatasetTree tree = new DatasetTree();
	DatasetServiceAsync svc = GWT.create(DatasetService.class);
	svc.load(new AsyncCallback<List<Dataset>>() {

		@Override
		public void onFailure(Throwable caught) {
			logger.info("Failed to load data component:" + caught.getMessage());
		}

		@Override
		public void onSuccess(List<Dataset> result) {
			for (Dataset m : result) {
				if (!m.getDeprecated()) {
					DatasetLeaf node = new DatasetLeaf(m);
					addDatasetLeaf(tree, node, userEmail);
					addContextMenu(tree,node);
				}
			}
		}
	});
	return tree;
}
 

/**
 * Create DownloadDataItem
 * @param com
 * @return DownloadDataItem
 */
public static MenuItem createDownloadData(HasRightMouseUpMenu com) {
	Command command = new MenuItemCommand(com) {

		@Override
		public void execute() {

			DatasetWidget widget = (DatasetWidget) this.component;
			widget.getContextMenu().hide();
			OutNodeShape shape = widget.getOutNodeShapes().get(0);
			String filename = shape.getAbsolutePath() + "/" + shape.getFileId();
			String url = GWT.getModuleBaseURL().split("EMLStudio")[0]
					+ "EMLStudioMonitor/filedownload?filename=" + filename;
			Window.open(url, "_blank", "status=0,toolbar=0,menubar=0,location=0");

		}

	};

	MenuItem item = new MenuItem("Download", command);
	return item;
}
 

private static void safeObjectAppend(StringBuilder sbuf, Object o) {
        try {
            sbuf.append(o.toString());
        } catch (Throwable t) {
            GWT.log("SLF4J: Failed toString() invocation on an object of type ["
                    + o.getClass().getName() + "]", t);
/*
            System.err
                    .println("SLF4J: Failed toString() invocation on an object of type ["
                            + o.getClass().getName() + "]");
            t.printStackTrace();
*/
            sbuf.append("[FAILED toString()]");
        }

    }
 

public static void init() {
    GWT.setUncaughtExceptionHandler(throwable -> LOGGER.error("Uncaught Exception", throwable));
    ClientRouter clientRouter = new ClientRouter(new ClientEventFactory());
    ServerRouter serverRouter = new ServerRouter(new GwtRequestAsyncSender(new ServerEventFactory()));
    RequestEventProcessor requestEventProcessor = new RequestEventProcessor();
    SimpleEventsBus eventBus = new SimpleEventsBus(requestEventProcessor);
    ClientApp.ClientAppBuilder
            .clientRouter(clientRouter)
            .serverRouter(serverRouter)
            .eventsBus(eventBus)
            .requestRepository(new InMemoryCommandsRepository())
            .presentersRepository(new InMemoryPresentersRepository())
            .viewsRepository(new InMemoryViewRepository())
            .contributionsRepository(new InMemoryContributionRepository())
            .requestSendersRepository(new InMemoryRequestRestSendersRepository())
            .history(new StateHistory())
            .asyncRunner(new GwtAsyncRunner())
            .mainExtensionPoint(new CoreMainExtensionPoint())
            .dominoOptions(new RestyGwtOptions())
            .build();
}
 

private SelectHandler createUrlToShare(final VerticalPanel geoDataContainer) {
	return new SelectHandler() {
		@Override
		public void onSelect(SelectEvent event) {
			urlToShareAnchor.setHref(getHref());
			urlToShareAnchor.setText(
					UIMessages.INSTANCE.seeOtherWindow("GeoWE Project"),
					Direction.LTR);

			urlShared.setText(getHref());
			urlPanel.setVisible(true);
			urlShared.setVisible(true);
		}

		private String getHref() {
			String baseUrl = GWT.getHostPageBaseURL();

			baseUrl += "?projectUrl="
					+ URL.encodeQueryString(urlTextField.getValue());

			return baseUrl;
		}
	};
}
 

@Override
public String write() throws IOException {
    TypeSpec.Builder senderBuilder = makeSenderBuilder();
    if (hasServiceRoot())
        senderBuilder.addField(addServiceRoot());
    senderBuilder.addField(addPathField());
    TypeSpec serviceInterface = new ServiceInterfaceBuilder().build();
    senderBuilder.addType(serviceInterface);


    ClassName serviceInterfaceType = ClassName.bestGuess(serviceInterface.name);
    FieldSpec serviceInterfaceField = FieldSpec.builder(serviceInterfaceType, "service")
            .addModifiers(Modifier.PRIVATE)
            .initializer("$T.create($T.class)", GWT.class, serviceInterfaceType)
            .build();

    senderBuilder.addField(serviceInterfaceField);

    senderBuilder.addMethod(new SendMethodBuilder().build());

    StringBuilder asString = new StringBuilder();
    JavaFile.builder(processorElement.elementPackage(), senderBuilder.build()).skipJavaLangImports(true).build().writeTo(asString);
    return asString.toString();
}
 

public void initPageAsync(final String page) {
	GWT.runAsync(new RunAsyncCallback() {
		public void onSuccess() {
			init(page);
			LoadingWidget.getInstance().hide();
		}
		public void onFailure(Throwable reason) {
			Label error = new Label(MESSAGES.failedToLoadPage(reason.getMessage()));
			error.setStyleName("unitime-ErrorMessage");
			RootPanel loading = RootPanel.get("UniTimeGWT:Loading");
			if (loading != null) loading.setVisible(false);
			RootPanel.get("UniTimeGWT:Body").add(error);
			LoadingWidget.getInstance().hide();
			UniTimeNotifications.error(MESSAGES.failedToLoadPage(reason.getMessage()), reason);
		}
	});
}
 

private ComboBox<VectorLayerInfo> initLayerCombo1() {
					
	VectorLayerProperties properties = GWT
			.create(VectorLayerProperties.class);

	layerStore1 = new ListStore<VectorLayerInfo>(properties.key());

	layerCombo1 = new ComboBox<VectorLayerInfo>(layerStore1,
			properties.name());
	layerCombo1.setEmptyText((UIMessages.INSTANCE.sbLayerComboEmptyText()));
	layerCombo1.setTypeAhead(true);
	layerCombo1.setTriggerAction(TriggerAction.ALL);
	layerCombo1.setForceSelection(true);
	layerCombo1.setEditable(false);
	layerCombo1.enableEvents();
	layerCombo1.setWidth(width);

	layerCombo1.addSelectionHandler(new SelectionHandler<VectorLayerInfo>() {
		@Override
		public void onSelection(SelectionEvent<VectorLayerInfo> event) {
			layerCombo1.setValue(event.getSelectedItem(), true);
		}
	});

	return layerCombo1;
}
 

public void authenticate() {
	if (!CONSTANTS.allowUserLogin()) {
		if (isAllowLookup())
			doLookup();
		else
			ToolBox.open(GWT.getHostPageBaseURL() + "login.do?target=" + URL.encodeQueryString(Window.Location.getHref()));
		return;
	}
	AriaStatus.getInstance().setText(ARIA.authenticationDialogOpened());
	iError.setVisible(false);
	iDialog.center();
	Scheduler.get().scheduleDeferred(new ScheduledCommand() {
		@Override
		public void execute() {
			iUserName.selectAll();
			iUserName.setFocus(true);
		}
	});
}
 

@Override
   public PreloaderCallback getPreloaderCallback () {
	final Panel preloaderPanel = new VerticalPanel();
	preloaderPanel.setStyleName("gdx-preloader");
	final Image logo = new Image(GWT.getModuleBaseURL() + "logo.png");
	logo.setStyleName("logo");		
	preloaderPanel.add(logo);
	final Panel meterPanel = new SimplePanel();
	meterPanel.setStyleName("gdx-meter");
	meterPanel.addStyleName("red");
	final InlineHTML meter = new InlineHTML();
	final Style meterStyle = meter.getElement().getStyle();
	meterStyle.setWidth(0, Unit.PCT);
	meterPanel.add(meter);
	preloaderPanel.add(meterPanel);
	getRootPanel().add(preloaderPanel);
	return new PreloaderCallback() {

		@Override
		public void error (String file) {
			System.out.println("error: " + file);
		}
		
		@Override
		public void update (PreloaderState state) {
			meterStyle.setWidth(100f * state.getProgress(), Unit.PCT);
		}			
		
	};
}
 

@Override
public void initModule(Element element) {
    uiBinder = GWT.create(MathModuleViewUiBinder.class);
    uiBinder.createAndBindUi(this);

    moduleElement = element;
    styles = styleSocket.getStyles(moduleElement);

    readAttributes(element);
    initStyles(styles);
    initializePanels();
    initializeMathPlayer();
    generateGaps(getBodyGenerator());
    setGapMathStyles();
}
 

private HTML getHtmlReport() {
	VectorLayerTemplate template = GWT.create(VectorLayerTemplate.class);
	VectorFeature[] features = null;
	if (features == null) {
		features = new ArrayList<VectorFeature>()
				.toArray(new VectorFeature[0]);
	}
	return new HTML(template.renderTemplate(HelpMessages.INSTANCE, UIMessages.INSTANCE));
}
 

private SelectHandler createUrlToShare(final VerticalPanel geoDataContainer) {
	return new SelectHandler() {
		@Override
		public void onSelect(SelectEvent event) {
			urlToShareAnchor.setHref(getHref());
			urlToShareAnchor.setText(
					UIMessages.INSTANCE.seeOtherWindow(getLayerName()),
					Direction.LTR);

			urlShared.setText(getHref());
			urlPanel.setVisible(true);
			urlShared.setVisible(true);
		}

		private String getHref() {
			String baseUrl = GWT.getHostPageBaseURL();

			baseUrl += "?layerUrl="
					+ URL.encodeQueryString(urlTextField.getValue())
					+ "&layerName=" + getLayerName() + "&layerProj="
					+ getProjectionName() + "&layerFormat="
					+ getDataFormat();

			return baseUrl;
		}
	};
}
 

private void lodaDataFromURL(final String url) {
	final String urlBase = GWT.getHostPageBaseURL() + "gwtOpenLayersProxy";
	try {
		autoMessageBox.show();
		RestClient.create(URLFileRestService.class, urlBase,
				new RemoteCallback<String>() {
					@Override
					public void callback(String response) {
						parseCsvData(response);
						autoMessageBox.hide();
					}
				}, new RestErrorCallback() {
					@Override
					public boolean error(Request message,
							Throwable throwable) {
						autoMessageBox.hide();

						showAlert("Error"
								+ UIMessages.INSTANCE.unexpectedError());
						return false;
					}
				}, Response.SC_OK).getContent(url);
	} catch (Exception e) {
		autoMessageBox.hide();
		showAlert("Error loading data..." + e.getMessage());
	}
}
 

private void playFromSource(String src) {
    panelMain.clear();
    FlowPanel panelEmbed = new FlowPanel();
    String htmlId = Document.get().createUniqueId();
    panelEmbed.getElement().setId(htmlId);
    panelMain.add(panelEmbed);
    String installSrc = GWT.getModuleBaseURL() + "swfobject/expressInstall.swf";
    String swfSrc = GWT.getModuleBaseURL() + "flashAudioExecutorSimple/flashAudioExecutorSimple.swf";
    embedSwf(htmlId, swfSrc, installSrc, src);
}
 

@Inject
GinjectorFragmentOutputter(GeneratorContext ctx, GinjectorFragmentContext.Factory ginjectorFragmentContextFactory, ErrorManager errorManager,
                           TreeLogger logger, SourceWriteUtil.Factory sourceWriteUtilFactory, @Assisted GinjectorBindings bindings,
                           @Assisted FragmentPackageName fragmentPackageName, @Assisted("ginjectorPackageName") String ginjectorPackageName,
                           @Assisted("ginjectorClassName") String ginjectorClassName) {

    this.ctx = ctx;
    this.errorManager = errorManager;
    this.logger = logger;
    this.sourceWriteUtil = sourceWriteUtilFactory.create(bindings);

    this.fragmentPackageName = fragmentPackageName;
    this.ginjectorClassName = ginjectorClassName;
    this.nameGenerator = bindings.getNameGenerator();

    fragmentClassName = nameGenerator.getFragmentClassName(ginjectorClassName, fragmentPackageName);
    if (fragmentClassName.contains(".")) {
        errorManager.logError("Internal error: the fragment class name \"%s\" contains a full stop.", fragmentClassName);
    }

    PrintWriter printWriter = ctx.tryCreate(logger, fragmentPackageName.toString(), fragmentClassName);
    if (printWriter == null) {
        // Something is very wrong! We already created this fragment, but the
        // GinjectorBindingsOutputter should only create each fragment once.
        // Something bad will probably happen later on if we continue, so just
        // abort.
        logger.log(TreeLogger.Type.ERROR, "The fragment " + fragmentPackageName + "." + fragmentClassName + " already exists.");
        throw new IllegalStateException("The fragment " + fragmentClassName + " already exists.");
    }

    ClassSourceFileComposerFactory composerFactory = new ClassSourceFileComposerFactory(fragmentPackageName.toString(), fragmentClassName);

    composerFactory.addImport(GWT.class.getCanonicalName());
    composerFactory.addImport(ginjectorPackageName + "." + ginjectorClassName);
    writer = composerFactory.createSourceWriter(ctx, printWriter);

    injectorWriteContext = ginjectorFragmentContextFactory.create(bindings, fragmentPackageName, writer);
}
 

public void testCreate() {
    SelectionModuleJAXBParser jaxbParserFactory = GWT.create(SelectionModuleJAXBParser.class);
    JAXBParser<SelectionInteractionBean> jaxbParser = jaxbParserFactory.create();

    SelectionInteractionBean interactionBean = jaxbParser.parse(testXml);

    assertNotNull(interactionBean);
    assertEquals("dummy1", interactionBean.getId());
    assertEquals(1, interactionBean.getMatchMax());
    assertEquals("SELECTION_RESPONSE_1", interactionBean.getResponseIdentifier());
    assertEquals(false, interactionBean.isMulti());
    assertEquals(true, interactionBean.isShuffle());

    // validate items
    List<SelectionItemBean> items = interactionBean.getItems();
    assertEquals(2, items.size());

    validateItem(items.get(0), "SELECTION_RESPONSE_1_0", 1, true, "<math>a1</math>");
    validateItem(items.get(1), "SELECTION_RESPONSE_1_3", 2, false, "b1");

    // validate choices
    List<SelectionSimpleChoiceBean> simpleChoices = interactionBean.getSimpleChoices();
    assertEquals(2, simpleChoices.size());

    validateChoice(simpleChoices.get(0), "SELECTION_RESPONSE_1_1", 1, "<math>a2</math>");
    validateChoice(simpleChoices.get(1), "SELECTION_RESPONSE_1_4", 2, "b2");
}
 

public VectorFormatComboBox(String width,
		Collection<VectorFormat> vectorFormats) {
	super(new ListStore<VectorFormat>(
			((VectorFormatProperties)GWT.create(VectorFormatProperties.class)).key()),
			((VectorFormatProperties)GWT.create(VectorFormatProperties.class)).name());
	initialize(width);
	getStore().addAll(vectorFormats);
}
 

public void testShouldParseExternalInteractionBean() {
    //given
    final String expectedURL = "external/view.html";
    String xml = "<externalInteraction src=\"" + expectedURL + "\"/>";

    ExternalInteractionModuleJAXBParserFactory jaxbParserFactory = GWT.create(ExternalInteractionModuleJAXBParserFactory.class);
    JAXBParser<ExternalInteractionModuleBean> externalInteractionModuleBeanJAXBParser = jaxbParserFactory.create();

    // when
    ExternalInteractionModuleBean actual = externalInteractionModuleBeanJAXBParser.parse(xml);

    // then
    assertEquals(actual.getSrc(), expectedURL);
}
 

@Inject
  public MainViewPresenter(MainView mainView, AppContext appContext) {
  	this.mainView = mainView;
  	this.appContext = appContext;

  	exportGetKeyConvertigoMachineUrl();
  	exportInjectDocReadyAndC8OCoreScripts();
  	exportGetConvertigoMachineUrl();

defineConvertigoUrl(getConvertigoMachineUrl());

  	final String jsFile = "init.js";
  	ScriptInjector.fromUrl(GWT.getModuleBaseURL() + jsFile)
       .setWindow(ScriptInjector.TOP_WINDOW)
       .setCallback(new Callback<Void, Exception>() {
           @Override
           public void onSuccess(final Void result) {
               Log.info(MainViewPresenter.class, jsFile + " loaded.");
           }
	
           @Override
           public void onFailure(final Exception e) {
               Log.error(MainViewPresenter.class, "Unable to load " + jsFile, e);
           }
       })
       .inject();
  }
 

public void initialize() {
	final List<Layer> vectorLayers = new ArrayList<Layer>();

	final LayerTree vectorialLayerTree = GWT.create(LayerTree.class);
	vectorialLayerTree.createTree(vectorLayers, VECTOR_ROOT_NAME);
	vectorialLayerTree.setToolbar(vectorLayerToolBar);
	vectorialLayerTree.setMap(geoMap);
	vectorialLayerTree.setCell(layerManagerWidget.getTreeClickEvent());
	layerManagerWidget.add(LayerManagerWidget.VECTOR_TAB,
			vectorialLayerTree);		
}
 

public void startCalendarItemDrag(MouseDownEvent event, final MonthItemLabel label) {

        moveRegistration = addMouseMoveHandler(this);
        startX = event.getClientX();
        startY = event.getClientY();
        startYrelative = event.getRelativeY(label.getParent().getElement())
                % getHeigth();
        startXrelative = event.getRelativeX(label.getParent().getElement())
                % getWidth();

        CalendarItem e = getItemByWidget(label);
        dndSourceDateFrom = (Date) e.getStart().clone();
        dndSourceDateTo = (Date) e.getEnd().clone();

        dndSourceStartDateTime = (Date) e.getStartTime().clone();
        dndSourceEndDateTime = (Date) e.getEndTime().clone();

        Event.setCapture(getElement());
        keyDownHandler = addKeyDownHandler(keyDownHandler -> {
            if (keyDownHandler.getNativeKeyCode() == KeyCodes.KEY_ESCAPE) {
                cancelItemDrag(label);
            }
        });

        focus();

        GWT.log("Start drag");
    }
 

@Override
protected void gwtSetUp() throws Exception {

    TestGinjector injector = GWT.create(TestGinjector.class);
    loader = injector.getModulesStateLoader();

    firstModule = new ModuleMock(FIRST_IDENTIFIER);
    secondModule = new ModuleMock(SECOND_IDENTIFIER);

    modules = Lists.newArrayList((IModule) firstModule, (IModule) secondModule);
}
 

@Override
public Preloader.PreloaderCallback getPreloaderCallback() {
    final VerticalPanel preloaderPanel = new VerticalPanel();
    preloaderPanel.setStyleName("gdx-preloader");
    preloaderPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
    final Image logo = new Image(GWT.getModuleBaseURL() + "logo.gif");
    logo.setStyleName("logo");
    preloaderPanel.add(logo);
    final Panel meterPanel = new SimplePanel();
    meterPanel.setStyleName("gdx-meter");
    meterPanel.addStyleName("red");
    final InlineHTML meter = new InlineHTML();
    final Style meterStyle = meter.getElement().getStyle();
    meterStyle.setWidth(0, Style.Unit.PCT);
    meterPanel.add(meter);
    preloaderPanel.add(meterPanel);
    getRootPanel().add(preloaderPanel);
    return new Preloader.PreloaderCallback() {
        @Override
        public void error(String file) {
            System.out.println("error: " + file);
        }

        @Override
        public void update(Preloader.PreloaderState state) {
            meterStyle.setWidth(100f * state.getProgress(), Style.Unit.PCT);
        }

    };
}
 

private void schedulers() {
    // GWT Schedulers, various callbacks, not easy to combine or specify timing operations like a timeout!
    gwtScheduler().scheduleDeferred((ScheduledCommand) () -> L.log("one time command done!"));
    gwtScheduler().scheduleIncremental((RepeatingCommand) () -> {L.log("repeating command done!"); return false;});
    // to use RX first just wrap the task in a RX type, for example a log call into a Completable
    Completable rxTask = Completable.fromAction(() -> L.log("one time command done!")); // by default synchronous
    // with RX you can specify in which scheduler do you want to execute the task
    rxTask.subscribeOn(GwtSchedulers.deferredScheduler()); // async using a deferred scheduler
    rxTask.subscribeOn(GwtSchedulers.incrementalScheduler()); // async using a incremental scheduler
    rxTask.subscribeOn(Schedulers.io()); // GWT agnostic, but yep, this is mapped to deferred
    rxTask.subscribeOn(Schedulers.computation()); // and this one to is mapped to incremental
    // remember that this is a chained description, so you should save the instance, like this
    rxTask.subscribeOn(Schedulers.io()).subscribe(() -> L.log("task executed async!"));

    // for repeating tasks like a timer
    new Timer() { public void run() { L.log("whOOt? inheritance instead of composition?!");} }.schedule(100);
    // you should generate stream of ticks, called 'interval' (timer exists, but just emmit 1 tick)
    interval(100, MILLISECONDS).flatMapCompletable(n -> rxTask);

    // and a final example, if the web is online (and stop if not) do a task each 5min
    online().switchMap(online -> online ? interval(5, MINUTES) : Observable.never())
            // fetching a big list of data, so big that need to be reduced incrementally to no block the
            // main loop, as our API is RX friendly, just observe each result item in the computation scheduler
            .flatMapSingle(refresh -> requestData().observeOn(computation())
                    // and reduce each item here, until the whole response is processed
                    .<Set<String>>reduceWith(HashSet::new, (acc,n) -> { acc.add(n); return acc; }))
            // at this point the response has been processed incrementally!
            .doOnNext(result -> GWT.log("save the processed result: " + result))
            // if something goes wrong, wait 1 minute and try again, the try will reconnect the whole observable
            // so if the web is offline, it will not try to process again until it get online!
            .retryWhen(at -> at.flatMapSingle(ex -> { GWT.log("updater error", ex); return timer(1, MINUTES); }))
            .subscribe(); // eventually we'll see that subscribe responsibility can be delegated! (safer!)
}
 

public static MenuItem create(final DatasetLeaf node) {

		Command command = new MenuItemCommand(node) {

			@Override
			public void execute() {
				String id = node.getModule().getId();
				boolean y = Window.confirm("Ready to delete " + node.getText() + "？");
				if (y) {
					DatasetServiceAsync svc = GWT.create(DatasetService.class);
					svc.delete(id, new AsyncCallback<Void>() {

						@Override
						public void onFailure(Throwable caught) {
							Window.alert(caught.getMessage());
						}

						@Override
						public void onSuccess(Void result) {
							node.delete();
						}
					});
				}

				this.component.getContextMenu().hide();
			}
		};

		MenuItem item = new MenuItem("Delete", command);
		return item;
	}
 

public static MenuItem create(final ProgramLeaf node) {

		Command command = new MenuItemCommand(node) {

			@Override
			public void execute() {
				String id = node.getModule().getId();
				boolean y = Window.confirm("Are you ready to delete " + node.getText() + "？");
				if (y) {
					ProgramServiceAsync svc = GWT.create(ProgramService.class);
					svc.delete(id, new AsyncCallback<Void>() {

						@Override
						public void onFailure(Throwable caught) {
							Window.alert(caught.getMessage());
						}

						@Override
						public void onSuccess(Void result) {
							node.delete();
						}

					});
				}
				this.component.getContextMenu().hide();
			}
		};

		MenuItem item = new MenuItem("delete", command);
		return item;
	}
 

public static MenuItem create(final JobLeaf node) {
	Command command = new MenuItemCommand(node) {

		@Override
		public void execute() {
			String id = node.getModule().getJobId();
			boolean y = Window.confirm("Are you sure you want to join the example task?");
			if (y) {
				JobServiceAsync srv = GWT.create(JobService.class);
				srv.setExampleJobs(id, new AsyncCallback<Void>() {

					@Override
					public void onFailure(Throwable caught) {
						Window.alert(caught.getMessage());
					}

					@Override
					public void onSuccess(Void result) {
						node.delete();
					}
				});
			}
			this.component.getContextMenu().hide();
		}
	};
	MenuItem item = new MenuItem("Join example task", command);
	return item;
}
 

public static MenuItem create(final ProgramLeaf node) {
	Command command = new MenuItemCommand(node) {
		@Override
		public void execute() {
			String id = node.getModule().getId();
			boolean y = Window.confirm("Are you ready to deprecate " + node.getModule().getName() + "？");
			if (y) {
				ProgramServiceAsync svc = GWT.create(ProgramService.class);
				svc.deprecate(id, new AsyncCallback<Void>() {

					@Override
					public void onFailure(Throwable caught) {
						Window.alert(caught.getMessage());
					}

					@Override
					public void onSuccess(Void result) {
						node.delete();
					}

				});
			}
			this.component.getContextMenu().hide();
		}

	};

	MenuItem item = new MenuItem("deprecate", command);
	return item;
}
 

public static MenuItem create(final JobLeaf node) {
	Command command = new MenuItemCommand(node) {

		@Override
		public void execute() {
			String id = node.getModule().getJobId();
			boolean y = Window.confirm("Are you sure you want to delete?");
			if (y) {
				JobServiceAsync srv = GWT.create(JobService.class);
				srv.deleteJob(id, new AsyncCallback<Void>() {

					@Override
					public void onFailure(Throwable caught) {
						Window.alert(caught.getMessage());
					}

					@Override
					public void onSuccess(Void result) {
						node.delete();
					}
				});
			}
			this.component.getContextMenu().hide();
		}
	};
	MenuItem item = new MenuItem("Delete", command);
	return item;
}
 

public static MenuItem create(final DatasetLeaf node) {
	Command command = new MenuItemCommand(node) {
		@Override
		public void execute() {
			String id = node.getModule().getId();
			boolean y = Window.confirm("Ready to deprecate " + node.getModule().getName() + "？");
			if (y) {
				DatasetServiceAsync svc = GWT.create(DatasetService.class);
				svc.deprecate(id, new AsyncCallback<Void>() {

					@Override
					public void onFailure(Throwable caught) {
						Window.alert(caught.getMessage());
					}

					@Override
					public void onSuccess(Void result) {
						node.delete();
					}

				});
			}
			this.component.getContextMenu().hide();
		}
	};

	MenuItem item = new MenuItem("Deprecate", command);
	return item;
}
 

public static MenuItem create(final ProgramLeaf node) {
	Command command = new MenuItemCommand(node) {

		@Override
		public void execute() {
			String id = node.getModule().getId();
			ProgramServiceAsync svc = GWT.create(ProgramService.class);
			svc.download(id, new AsyncCallback<String>() {

				@Override
				public void onFailure(Throwable caught) {
					Window.alert(caught.getMessage());
				}

				@Override
				public void onSuccess(String result) {
					String url = GWT.getModuleBaseURL().split("EML")[0]
							+ "EMLStudioMonitor/filedownload?filename=" + result;
					Window.open(url, "_blank",
							"status=0,toolbar=0,menubar=0,location=0");
				}

			});
			this.component.getContextMenu().hide();
		}
	};

	MenuItem item = new MenuItem("Download", command);
	return item;
}
 

@Override
public void publish(LogRecord record) {
    if (isLoggable(record)) {
        if (!ServiceRootMatcher.hasServiceRoot(PATH))
            ((RestServiceProxy) service).setResource(new Resource(GWT.getHostPageBaseURL()));
        else
            ((RestServiceProxy) service).setResource(new Resource(ServiceRootMatcher.matchedServiceRoot(PATH)));
        service.send(asSerializableLogRecord(record), new RemoteLoggingCallBack());
    }
}
 

private SerializableLogRecord asSerializableLogRecord(LogRecord record) {
    SerializableLogRecord serializableLogRecord = new SerializableLogRecord();
    serializableLogRecord.level = record.getLevel().toString();
    serializableLogRecord.millis = record.getMillis();
    serializableLogRecord.message = record.getMessage();
    serializableLogRecord.loggerName = record.getLoggerName();
    serializableLogRecord.permutationStrongName = GWT.getPermutationStrongName();
    serializableLogRecord.thrown = serializableThrowable(unwrap(record.getThrown()));
    return serializableLogRecord;
}
 

protected void export(String format) {
	RPC.execute(EncodeQueryRpcRequest.encode(query(format)), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

void export(String type) {
	RoomCookie cookie = RoomCookie.getInstance();
	String query = "output=" + type;
	FilterRpcRequest requests = iFilterBox.getElementsRequest();
	if (requests.hasOptions()) {
		for (Map.Entry<String, Set<String>> option: requests.getOptions().entrySet()) {
			for (String value: option.getValue()) {
				query += "&r:" + option.getKey() + "=" + URL.encodeQueryString(value);
			}
		}
	}
	if (requests.getText() != null && !requests.getText().isEmpty()) {
		query += "&r:text=" + URL.encodeQueryString(requests.getText());
	}
	query += "&sort=" + InstructorCookie.getInstance().getSortTeachingRequestsBy(iAssigned) +
			"&columns=" + InstructorCookie.getInstance().getTeachingRequestsColumns(iAssigned) + 
			"&grid=" + (cookie.isGridAsText() ? "0" : "1") +
			"&vertical=" + (cookie.areRoomsHorizontal() ? "0" : "1") +
			(cookie.hasMode() ? "&mode=" + cookie.getMode() : "");
	RPC.execute(EncodeQueryRpcRequest.encode(query), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

void export(String type) {
	RoomCookie cookie = RoomCookie.getInstance();
	String query = "output=" + type;
	FilterRpcRequest requests = iFilterBox.getElementsRequest();
	if (requests.hasOptions()) {
		for (Map.Entry<String, Set<String>> option: requests.getOptions().entrySet()) {
			for (String value: option.getValue()) {
				query += "&r:" + option.getKey() + "=" + URL.encodeQueryString(value);
			}
		}
	}
	if (requests.getText() != null && !requests.getText().isEmpty()) {
		query += "&r:text=" + URL.encodeQueryString(requests.getText());
	}
	query += "&sort=" + InstructorCookie.getInstance().getSortTeachingAssignmentsBy() +
			"&columns=" + InstructorCookie.getInstance().getTeachingAssignmentsColumns() + 
			"&grid=" + (cookie.isGridAsText() ? "0" : "1") +
			"&vertical=" + (cookie.areRoomsHorizontal() ? "0" : "1") +
			(cookie.hasMode() ? "&mode=" + cookie.getMode() : "");
	RPC.execute(EncodeQueryRpcRequest.encode(query), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

private void initializeStatusGrid() {
	// Creacion del Grid Base
	StatusItemProperties props = GWT.create(StatusItemProperties.class);
	statusStore = new ListStore<StatusItem>(props.key());
	statusStore.setAutoCommit(true);

	ColumnConfig<StatusItem, String> nameCol = new ColumnConfig<StatusItem, String>(
			props.name(), 75, UIMessages.INSTANCE.fedColumnNameText());

	ColumnConfig<StatusItem, String> valueCol = new ColumnConfig<StatusItem, String>(
			props.value(), 150,
			UIMessages.INSTANCE.fedNewAttributeDefaultNameText());

	List<ColumnConfig<StatusItem, ?>> columns = new ArrayList<ColumnConfig<StatusItem, ?>>();
	columns.add(nameCol);
	columns.add(valueCol);

	statusGrid = new Grid<StatusItem>(statusStore,
			new ColumnModel<StatusItem>(columns));
	statusGrid.setSelectionModel(new CellSelectionModel<StatusItem>());
	statusGrid.getColumnModel().getColumn(1).setHideable(false);
	statusGrid.setHideHeaders(true);
	statusGrid.setAllowTextSelection(true);
	statusGrid.getView().setStripeRows(true);
	statusGrid.getView().setColumnLines(true);
	statusGrid.setBorders(false);

	statusStore.add(new StatusItem(LON_LABEL, null));
	statusStore.add(new StatusItem(LAT_LABEL, null));
	statusStore.add(new StatusItem(SCALE_LABEL, null));
	statusStore.add(new StatusItem(CLICK_COORD_X, null));
	statusStore.add(new StatusItem(CLICK_COORD_Y, null));
}
 

public void onModuleLoadDeferred() {
	// register triggers
	GWT.runAsync(new RunAsyncCallback() {
		@Override
		public void onSuccess() {
			for (Triggers t: Triggers.values())
				t.register();
			callGwtOnLoadIfExists();
		}
		@Override
		public void onFailure(Throwable reason) {
		}
	});
	
	// load page
	if (RootPanel.get("UniTimeGWT:Body") != null) {
		LoadingWidget.getInstance().show(MESSAGES.waitLoadingPage());
		Scheduler.get().scheduleDeferred(new ScheduledCommand() {
			@Override
			public void execute() {
				initPageAsync(Window.Location.getParameter("page"));
			}
		});
	}
	
	// load components
	for (final Components c: Components.values()) {
		final RootPanel p = RootPanel.get(c.id());
		if (p != null) {
			Scheduler.get().scheduleDeferred(new ScheduledCommand() {
				@Override
				public void execute() {
					initComponentAsync(p, c);
				}
			});
		}
		if (p == null && c.isMultiple()) {
			NodeList<Element> x = getElementsByName(c.id());
			if (x != null && x.getLength() > 0)
				for (int i = 0; i < x.getLength(); i++) {
					Element e = x.getItem(i);
					e.setId(DOM.createUniqueId());
					final RootPanel q = RootPanel.get(e.getId());
					Scheduler.get().scheduleDeferred(new ScheduledCommand() {
						@Override
						public void execute() {
							initComponentAsync(q, c);
						}
					});
				}
		}
	}
	
	Window.addWindowClosingHandler(new Window.ClosingHandler() {
		@Override
		public void onWindowClosing(Window.ClosingEvent event) {
			if (isLoadingDisplayed() || LoadingWidget.getInstance().isShowing()) return;
			LoadingWidget.showLoading(MESSAGES.waitPlease());
			iPageLoadingTimer = new Timer() {
				@Override
				public void run() {
					RPC.execute(new IsSessionBusyRpcRequest(), new AsyncCallback<GwtRpcResponseBoolean>() {
						@Override
						public void onFailure(Throwable caught) {
							LoadingWidget.hideLoading();
						}
						@Override
						public void onSuccess(GwtRpcResponseBoolean result) {
							if (result.getValue()) {
								iPageLoadingTimer.schedule(500);
							} else {
								LoadingWidget.hideLoading();
							}
						}
					});
				}
			};
			iPageLoadingTimer.schedule(500);
		}
	});
}
 

public void initComponentAsync(final RootPanel panel, final Components comp) {
	GWT.runAsync(new RunAsyncCallback() {
		public void onSuccess() {
			comp.insert(panel);
		}
		public void onFailure(Throwable reason) {
		}
	});
}
 

protected P getPopupWidget() {
	if (iPopupWidget == null) {
		iPopupWidget = new P("unitime-RoomPictureHint");
		Image image = new Image(GWT.getHostPageBaseURL() + "picture?id=" + iPicture.getUniqueId());
		image.setStyleName("picture");
		iPopupWidget.add(image);
		P caption = new P("caption");
		caption.setText(iPicture.getName() + (iPicture.getPictureType() == null ? "" : " (" + iPicture.getPictureType().getAbbreviation() + ")"));
		iPopupWidget.add(caption);
	}
	return iPopupWidget;
}
 

LinkCell(RoomPictureInterface picture) {
super(new Image(RESOURCES.download()), GWT.getHostPageBaseURL() + "picture?id=" + picture.getUniqueId());
setStyleName("link");
setTitle(picture.getName() + (picture.getPictureType() == null ? "" : " (" + picture.getPictureType().getLabel() + ")"));
setText(picture.getName() + (picture.getPictureType() == null ? "" : " (" + picture.getPictureType().getAbbreviation() + ")"));
      setTarget("_blank");
      sinkEvents(Event.ONCLICK);
  }
 

@Override
public void refresh() {
	clear(); setHTML("");
	RoomCookie cookie = RoomCookie.getInstance();
	if (cookie.isGridAsText() || !iType.isFinal()) {
		if (iRoom.getPeriodPreference() != null)
			setHTML(iRoom.getPeriodPreference());
	} else {
		add(new Image(GWT.getHostPageBaseURL() + "pattern?loc=" + iRoom.getUniqueId() + "&xt=" + iType.getId() +
				"&v=" + (cookie.areRoomsHorizontal() ? "0" : "1") + (cookie.hasMode() ? "&s=" + cookie.getMode() : "")));
	}
}
 

protected void export(String format) {
	RPC.execute(EncodeQueryRpcRequest.encode(query(format)), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

protected void export(String format) {
	RPC.execute(EncodeQueryRpcRequest.encode(query(format)), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

protected void export(String format) {
	RPC.execute(EncodeQueryRpcRequest.encode(query(format)), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

@Override
public void onMouseDown(MouseDownEvent event) {

    startX = event.getClientX();
    startY = event.getClientY();

    if (isDisabled() || event.getNativeButton() != NativeEvent.BUTTON_LEFT) {
        return;
    }

    clickTarget = Element.as(event.getNativeEvent().getEventTarget());
    mouseMoveCanceled = false;

    if ((weekGrid.getCalendar().isItemMoveAllowed() && getCalendarItem().isMoveable())
            || (clickTargetsResize() && getCalendarItem().isResizeable())) {

        moveRegistration = addMouseMoveHandler(this);
        setFocus(true);
        try {
            startYrelative = (int) ((double) event.getRelativeY(caption) % slotHeight);
            startXrelative = (event.getRelativeX(weekGrid.getElement())
                    - weekGrid.timebar.getOffsetWidth())
                    % getDateCellWidth();
        } catch (Exception e) {
            GWT.log("Exception calculating relative start position", e);
        }
        mouseMoveStarted = false;
        Style s = getElement().getStyle();
        s.setZIndex(1000);
        startDatetimeFrom = (Date) calendarItem.getStartTime().clone();
        startDatetimeTo = (Date) calendarItem.getEndTime().clone();
        Event.setCapture(getElement());
    }

    // make sure the right cursor is always displayed
    if (clickTargetsResize() && getCalendarItem().isResizeable()) {
        addGlobalResizeStyle();
    }

    /*
     * We need to stop the event propagation or else the WeekGrid range
     * select will kick in
     */
    event.stopPropagation();
    event.preventDefault();
}
 

private void exportData(String format) {
	String query = "output=unassigned-classes." + format + iFilter.getQuery() + "&sort=" + SolverCookie.getInstance().getNotAssignedClassesSort();
	RPC.execute(EncodeQueryRpcRequest.encode(query), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

private void exportData() {
	String query = "output=timetable.pdf" + iFilter.getQuery();
	RPC.execute(EncodeQueryRpcRequest.encode(query), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

private void exportData(String format) {
	String query = "output=assigned-classes." + format + iFilter.getQuery() + "&sort=" + SolverCookie.getInstance().getAssignedClassesSort();
	RPC.execute(EncodeQueryRpcRequest.encode(query), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

public static void checkAccess(Throwable t) {
	if (t != null && t instanceof GwtRpcException && t.getCause() != null) t = t.getCause();
	if (t != null && t instanceof PageAccessException) {
		open(GWT.getHostPageBaseURL() + "login.do?menu=hide&m=" + URL.encodeQueryString(t.getMessage())+"&target=" + URL.encodeQueryString(Window.Location.getHref()));
		/*
		UniTimeFrameDialog.openDialog("UniTime " + CONSTANTS.version() + "| Log In", "login.do?menu=hide&m=" + URL.encodeQueryString(t.getMessage())
				+"&target=" + URL.encodeQueryString(Window.Location.getHref()), "700px", "420px");
		*/
	}
}
 

protected void export(String format, boolean includeRoomWeekFilter) {
	RPC.execute(EncodeQueryRpcRequest.encode(query(format, includeRoomWeekFilter)), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}
 

public void showSuggestionsAsync(final int rowIndex) {
	if (rowIndex < 0) return;
	GWT.runAsync(new RunAsyncCallback() {
		public void onSuccess() {
			openSuggestionsBox(rowIndex);
		}
		public void onFailure(Throwable caught) {
			iStatus.error(MESSAGES.exceptionSuggestionsFailed(caught.getMessage()), caught);
		}
	});
}
 

private void exportData() {
	int tab = iTabIndex;
	if (tab < 0)
		tab = SectioningStatusCookie.getInstance().getTab(iOnline);
	
	String query = "output=student-dashboard.csv&online=" + (iOnline ? 1 : 0) + "&tab=" + tab + "&sort=" + SectioningStatusCookie.getInstance().getSortBy(iOnline, tab);
	if (tab == 0)
		for (Long courseId: iSelectedCourseIds)
			query += "&c=" + courseId;
	query += "&query=" + URL.encodeQueryString(iFilter.getValue());
	FilterRpcRequest req = iFilter.getElementsRequest();
	if (req.hasOptions()) {
		for (Map.Entry<String, Set<String>> option: req.getOptions().entrySet()) {
			for (String value: option.getValue()) {
				query += "&f:" + option.getKey() + "=" + URL.encodeQueryString(value);
			}
		}
	}
	if (req.getText() != null && !req.getText().isEmpty()) {
		query += "&f:text=" + URL.encodeQueryString(req.getText());
	}
	
	RPC.execute(EncodeQueryRpcRequest.encode(query), new AsyncCallback<EncodeQueryRpcResponse>() {
		@Override
		public void onFailure(Throwable caught) {
		}
		@Override
		public void onSuccess(EncodeQueryRpcResponse result) {
			ToolBox.open(GWT.getHostPageBaseURL() + "export?q=" + result.getQuery());
		}
	});
}