Stripes : RedirectResolution; How can I redirect to specific action event? - redirect

I have an action bean in my stripes application. The default handler/method will display a list of data, a list of all my MarketResearch objects
On my JSP, I can click on one to view its details, this takes me to a different JSP with a pre-populated form based on the particular MarketResearch object that you selected.
I have another method on my action bean which is mapped to the save submit button, this takes in what is on the amended form, and persists it. After this has taken place, I want it to redirect back to the form, rather than to the listing (default handler) action, is this possible?
My action is as follows :
public class MarketResearchAction extends BaseAction
{
#SpringBean
ClientService clientService;
private static final String VIEW = "/jsp/marketResearch.jsp";
private Client client;
private Client clientBeforeChanges;
public Client getClient()
{
return client;
}
public void setClient(Client client)
{
this.client = client;
}
#DefaultHandler
public Resolution viewAll()
{
return new ForwardResolution(VIEW);
}
public Resolution viewClientMarketResearch()
{
if (client.getSector().equals("Education"))
{
return new ForwardResolution("/jsp/marketResearchEducation.jsp");
} else if (client.getSector().equals("Local Government"))
{
return new ForwardResolution("/jsp/marketResearchLocalGovernment.jsp");
} else if (client.getSector().equals("Housing Association"))
{
return new ForwardResolution("/jsp/marketResearchHousing.jsp");
}
return new ForwardResolution("/jsp/viewClientMarketResearch.jsp");
}
public Resolution save()
{
clientBeforeChanges = clientService.getClientById(client.getId());
clientService.persistClient(client);
getContext().getMessages().add(new SimpleMessage("{0} updated", client.getName()));
return new RedirectResolution("/MarketResearch.action").flash(this);
}
public Client getClientBeforeChanges()
{
return clientBeforeChanges;
}
public void setClientBeforeChanges(Client clientBeforeChanges)
{
this.clientBeforeChanges = clientBeforeChanges;
}
public ClientService getClientService()
{
return clientService;
}
public void setClientService(ClientService clientService)
{
this.clientService = clientService;
}
}
Is it possible? Or am I approaching the situation from a bad angle and should re-factor?
Thanks

Yes. You could return a RedirectResolution to the form jsp. If you're having difficulty with the parameters, if you have them in the save() method, you could do like so:
return new RedirectResolution("/theJsp.jsp")
.addParameter("one", one)
.addParameter("two", two)
.addParameter("three", three)
.flash(this);
If you don't have the params that were passed to the form, you'll have to keep them going somehow. You could pass the MarketResearch object through the form so you'd have it there.
<stripes:hidden name="marketResearch" value="${ActionBean.marketResearch}"/>
And add the requisite instance variable/getter/setter on your MarketResearchActionBean.

Related

Dynamic DataGrid in GWT

I am trying to construct a DataGrid in GWT that will show an arbitrary dataset taken from an rpc method.
I have done some progress as I get the fields from a method and the data from another.
I have managed to construct the Datagrid and add the columns from the rpc.getFields() method and fill the table using an AsyncDataProvider.
The problem is that when I refresh the browser, it duplicates all the columns at the Datagrid. I cannot figure out what to do. I tried to remove first all the columns but no luck.
I attach the code if anyone have an idea.
public class MyCallBack implements AsyncCallback<List<Field>> {
DataGrid<Record> dg;
public MyCallBack(DataGrid<Record> dgrid) {
this.dg=dgrid;
}
public void onFailure(Throwable caught) {
Window.alert(caught.getMessage());
}
public void onSuccess(List<Field> result) {
for (int i=0;i<=result.size();i++) {
IndexedColumn ic = new IndexedColumn(i);
dg.addColumn(ic, result.get(i).getLabel());
}
}
public AsyncCallback<List<Field>> getCb() {
return this;
}
public void onModuleLoad() {
final DataGrid<Record> dg = new DataGrid<Record>();
MyCallBack mcb = new MyCallBack(dg);
DataProvider dp = new DataProvider();
DBConnectionAsync rpcService = (DBConnectionAsync) GWT.create(DBConnection.class);
ServiceDefTarget target = (ServiceDefTarget) rpcService;
String moduleRelativeURL = GWT.getModuleBaseURL() + "MySQLConnection";
target.setServiceEntryPoint(moduleRelativeURL);
rpcService.getFields(mcb.getCb());
dp.addDataDisplay(dg);
dg.setVisibleRange(0, 200);
SplitLayoutPanel slp = new SplitLayoutPanel();
slp.setHeight("700px");
slp.setWidth("1500px");
slp.addWest(dg, 770);
RootPanel.get().add(slp);
}
When you refresh a browser, all UI is lost. There is no difference between (a) show the UI for the first time or (b) show the UI after browser refresh.
Your comment "Only if I restart tomcat it works" suggests that the problem is on the server side. Most likely, you return twice the number of data points on a second call.
Try clearing the table before filling it like this:
public void onSuccess(List<Field> result) {
clearTable();
for (int i=0;i<=result.size();i++) {
IndexedColumn ic = new IndexedColumn(i);
dg.addColumn(ic, result.get(i).getLabel());
}
}
private void clearTable(){
while (dg.getColumnCount() > 0) {
db.removeColumn(0);
}
}

Pushing data from one user to another in Vaadin web app

I get the fact that it might take more than 10 lines of code (hopefully not more than 50), but I was wondering if you could help me anyway.
I'm trying to update one user's UI thread at runtime, based on another user's input. I've created a basic project which implements three predefined users (jim, tom and threeskin). I'd like to send a message from jim to tom and have it appear as a new Label object in tom's UI, without threeskin ever knowing about it, even though they're all logged in. Oh, and jim shouldn't have to refresh his page. The label should just spawn on screen out of it's own accord.
To say that I'd appreciate some help would be the understatement of the decade.
public class User {
public String nume;
public User(String nume) {
super();
this.nume = nume;
}
}
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
public class Engine implements ServletContextListener {
public static ArrayList<User>userbase;
public void contextDestroyed(ServletContextEvent arg0) { }
public void contextInitialized(ServletContextEvent arg0) {
System.out.println("This code is running at startup");
userbase =new ArrayList<User>();
userbase.add(new User("jim"));userbase.add(new User("tom"));userbase.add(new User("threeskin"));
}
}
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
public class InfigeUI extends UI {
User us3r;
#WebServlet(value = "/*", asyncSupported = true)
#VaadinServletConfiguration(productionMode = false, ui = InfigeUI.class)
public static class Servlet extends VaadinServlet {}
protected void init(VaadinRequest request) {
VerticalLayout everything=new VerticalLayout();
setContent(everything);
if (us3r==null){everything.addComponent(auth());}else{everything.addComponent(main());}
}
ComponentContainer auth(){
final VerticalLayout layout = new VerticalLayout();
layout.setMargin(true);
TextField userField=new TextField();
Button login = new Button("Log in");
login.addClickListener(new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
us3r=login(userField.getValue());
if (us3r!=null){
saveValue(InfigeUI.this, us3r);
layout.removeAllComponents();
layout.addComponent(main());
}else{Notification.show("I only know jim, tom and threeskin. Which one are you?");}}
});
layout.addComponent(userField);
layout.addComponent(login);
return layout;
}
User login(String nume){
for (int i=0;i<Engine.userbase.size();i++){
if (nume.equals(Engine.userbase.get(i).nume)){return Engine.userbase.get(i);}
}
return null;
}
static void saveValue(InfigeUI ui,User value){
ui.us3r=value;
ui.getSession().setAttribute("something", value);
VaadinService.getCurrentRequest().getWrappedSession().setAttribute("something", value);
}
ComponentContainer main(){
VerticalLayout vl=new VerticalLayout();
Label label=new Label("This is the post-login screen");
String name=new String(us3r.nume);
Label eticheta=new Label(name);
TextField to=new TextField("Send to");
TextField message=new TextField("Message");
Button sendNow=new Button("Send now!");
vl.addComponent(eticheta);
vl.addComponent(label);
vl.addComponent(eticheta);
vl.addComponent(to);
vl.addComponent(message);
vl.addComponent(sendNow);
return vl ;
}
}
Basically you want three things
UI updates for a user which does no action himself, or in other words a message sent from the server to the browser. To enable this, you need to annotate the UI class using #Push. Otherwise, the update will only be shown when the user does something which causes a server visit, e.g. clicks a button
Some way of sending messages between UI instances (there is one UI instance per user). You can use some message bus implementation for this (CDI, Spring, ...) or you can make a simple on using a static field (static fields are shared between all users). See e.g. https://github.com/Artur-/SimpleChat for one way of doing it. It's also a good idea here to avoid all *.getCurrent methods as they in many cases will refer to another UI than you think (e.g. sender when you are in the receiver code), and you will do something else than you intend.
Safely update a UI when a message arrives. This is done using UI.access, also visible in the chat example.
First of all you need to enable the server push on your project help
based on Vaadin Documentation.
However, below code example will give what you want:
Create an Broadcast Listener Interface:
public interface BroadcastListener {
public void receiveBroadcast(final String message);
}
The Broadcaster Class:
public class Broadcaster {
private static final List<BroadcastListener> listeners = new CopyOnWriteArrayList<BroadcastListener>();
public static void register(BroadcastListener listener) {
listeners.add(listener);
}
public static void unregister(BroadcastListener listener) {
listeners.remove(listener);
}
public static void broadcast(final String message) {
for (BroadcastListener listener : listeners) {
listener.receiveBroadcast(message);
}
}
}
Your UI with Push Enalbed (via Annotation):
#Push
public class BroadcasterUI extends UI implements BroadcastListener {
#Override
protected void init(VaadinRequest request) {
final VerticalLayout layout = new VerticalLayout();
layout.setMargin(true);
setContent(layout);
final TextArea message = new TextArea("",
"The system is going down for maintenance in 10 minutes");
layout.addComponent(message);
final Button button = new Button("Broadcast");
layout.addComponent(button);
button.addClickListener(new Button.ClickListener() {
#Override
public void buttonClick(ClickEvent event) {
Broadcaster.broadcast(message.getValue());
}
});
// Register broadcast listener
Broadcaster.register(this);
}
#Override
public void detach() {
Broadcaster.unregister(this);
super.detach();
}
#Override
public void receiveBroadcast(final String message) {
access(new Runnable() {
#Override
public void run() {
Notification n = new Notification("Message received",
message, Type.TRAY_NOTIFICATION);
n.show(getPage());
}
});
}
you can find the full link here.

How do I tell a GWT cell widget data has changed via the Event Bus?

I have a GWT Cell Tree that I use to display a file structure from a CMS. I am using a AsyncDataProvider that loads data from a custom RPC class I created. I also have a Web Socket system that will broadcast events (File create, renamed, moved, deleted etc) from other clients also working in the system.
What I am trying to wrap my head around is when I recieve one of these events, how I correctly update my Cell Tree?
I suppose this problem would be analogus to having two instances of my Cell Tree on the page, which are presenting the same server-side data and wanting to ensure that when the user updated one, that the other updated as well, via using the EventBus.
I feel this should be pretty simple but I have spent about 6 hours on it now with no headway. My code is included below:
NOTE: I am not using RequestFactory even though it may look like I am it is my custom RPC framework. Also, FileEntity is just a simple representation of a file which has a name accessible by getName().
private void drawTree() {
// fileService is injected earlier on and is my own custom rpc service
TreeViewModel model = new CustomTreeModel(new FileDataProvider(fileService));
CellTree tree = new CellTree(model, "Root");
tree.setAnimationEnabled(true);
getView().getWorkspace().add(tree);
}
private static class CustomTreeModel implements TreeViewModel {
// I am trying to use a single AsyncDataProvider so I have a single point of loading data which I can manipulate (Not sure if this is the correct way to go)
public CustomTreeModel(FileDataProvider dataProvider) {
this.provider = provider;
}
public <T> NodeInfo<?> getNodeInfo(final T value) {
if (!(value instanceof FileEntity)) {
// I already have the root File loaded in my presenter, if we are at the root of the tree, I just add it via a list here
ListDataProvider<FileEntity> dataProvider = new ListDataProvider<FileEntity>();
dataProvider.getList().add(TreeWorkspacePresenter.rootFolder);
return new DefaultNodeInfo<FileEntity>(dataProvider,
new FileCell());
} else {
// Otherwise I know that we are loading some tree child data, and I invoke the AsyncProvider to load it from the server
provider.setFocusFile(value);
return new DefaultNodeInfo<FileEntity>(provider,
new FileCell());
}
}
public boolean isLeaf(Object value) {
if(value == null || value instanceof Folder)
return false;
return true;
}
}
public class FileDataProvider extends AsyncDataProvider<FileEntity> {
private FileEntity focusFile;
private FileService service;
#Inject
public FileDataProvider(FileService service){
this.service = service;
}
public void setFocusFile(FileEntity focusFile){
this.focusFile = focusFile;
}
#Override
protected void onRangeChanged(HasData<FileEntity> display) {
service.getChildren(((Folder) focusFile),
new Reciever<List<FileEntity>>() {
#Override
public void onSuccess(List<FileEntity> files) {
updateRowData(0, files);
}
#Override
public void onFailure(Throwable error) {
Window.alert(error.toString());
}
});
}
}
/**
* The cell used to render Files.
*/
public static class FileCell extends AbstractCell<FileEntity> {
private FileEntity file;
public FileEntity getFile() {
return file;
}
#Override
public void render(Context context, FileEntity file, SafeHtmlBuilder sb) {
if (file != null) {
this.file = file;
sb.appendEscaped(file.getName());
}
}
}
Currently there is no direct support for individual tree item refresh even in the latest gwt version.
But there is a workaround for this. Each tree item is associated with an value. Using this value you can get the corresponding tree item.
In your case, i assume, you know which item to update/refresh ie you know which File Entity has changed. Use this file entity to search for the corresponding tree item. Once you get the tree item you just need to expand and collapse or collapse and expand its parent item. This makes parent item to re-render its children. Your changed file entity is one among the children. So it get refreshed.
public void refreshFileEntity(FileEntity fileEntity)
{
TreeNode fileEntityNode = getFileEntityNode(fileEntity, cellTree.getRootTreeNode()
// For expnad and collapse run this for loop
for ( int i = 0; i < fileEntityNode.getParent().getChildCount(); i++ )
{
if ( !fileEntityNode.getParent().isChildLeaf( i ) )
{
fileEntityNode.getParent().setChildOpen( i, true );
}
}
}
public TreeNode getFileEntityNode(FileEntity fileEntity, TreeNode treeNode)
{
if(treeNode.getChildren == null)
{
return null;
}
for(TreeNode node : treeNode.getChildren())
{
if(fileEntity.getId().equals( node.getValue.getId() ))
{
return node;
}
getEntityNode(fileEntity, node);
}
}
You can use the dataprovider to update the celltree.
You can update the complete cell tree with:
provider.setList(pList);
provider.refresh();
If you want to update only a special cell you can get the listwrapper from the dataprovider and only set one element.
provider.getList().set(12, element);

How can i get the edited proxy from RequestFactoryEditorDriver

I can't figure out how to update my celltable after changes have been made using an editor. If I could get the edited proxy then I can use the dataprovider to update my celltable.
public void saveCampaign() {
driver.flush();
// the problem. proxy at this point should have the new values?....
context.persist().using(proxy).fire(new Receiver<Void>() {
#Override
public void onSuccess(Void response) {
showListView();
}
});
}
The proxy in .using(proxy) does not contain the changes made on the editor. However the persist method on the server gets the updated values. If I reload the data from the server I get the correct values to the celltable.
public void editCampaign(CampaignProxy proxy) {
this.proxy = proxy;
if (proxy != null) {
context = AEHOME.requestFactory.campaignRequest();
showEditView();
}
}
private void showEditView() {
driver.initialize(eventBus, AEHOME.requestFactory, editView);
driver.edit(proxy, context);
deckPanel.showWidget(deckPanel.getWidgetIndex(editView));
}
Proxy is set in the list view: configurationPageView.proxy = selectionModel.getSelectedObject();
Any advice would be greatly appreciated. Thank you.
You can change how the request is built by doing the following:
private void showEditView() {
driver.initialize(eventBus, AEHOME.requestFactory, editView);
driver.edit(proxy, context);
// Set up method invocation and callback in advance
context.persist().using(proxy).to(new Receiver<Void>() {
#Override
public void onSuccess(Void response) {
showListView();
}
}););
deckPanel.showWidget(deckPanel.getWidgetIndex(editView));
}
public void saveCampaign() {
driver.flush().fire();
}
In GWT 2.4 it will be possible to keep your current code organization and use RequestContext.append():
public void saveCampaign() {
// Returns the context passed to edit()
RequestContext ctx = driver.flush();
// append() is generic and returns the type returned by myProxyContext();
ctx.append(requestFactory.myProxyContext()).persist().using(proxy).fire(....);
}

How can I change a route value then redirect to that route?

I have a UserAccountController that takes routes like this "/{username}/{action}".
I'd like to create some functionality so that I can take a user to an account-specific page without knowing their username up front. I'd like to be able to use the URL "/your/{action}" which would catch the fact that "your" was sent as their username, get their real username (because they are logged in), and redirect them to "/their-actual-username/{action}".
I could do this in each of the controller actions, but I'd rather have it happen some place earlier that would do this for all of the controller actions. I attempted to do this in the Controller's Initialize method by changing the RouteData.Values["username"] to the real username then attempting to Response.RedirectToRoute(RouteData); Response.End() but that always took me to the wrong place (some completely wrong route).
Updated:
Thanks to BuildStarted for leading me to this answer:
public class UserAccountController : Controller
{
protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
base.OnActionExecuting(filterContext);
if ((string) filterContext.RouteData.Values["username"] != "your")
return;
var routeValues = new RouteValueDictionary(filterContext.RouteData.Values);
routeValues["username"] = UserSession.Current.User.Username;
filterContext.Result = new RedirectToRouteResult(routeValues);
}
}
You can use the FilterAttribute with IActionFilter to accomplish what you want.
public class UserFilterAttribute : FilterAttribute, IActionFilter {
public void OnActionExecuted(ActionExecutedContext filterContext) {
}
public void OnActionExecuting(ActionExecutingContext filterContext) {
var username = filterContext.RouteData.Values["username"];
var realUserName = ""; //load from database
filterContext.Result = new RedirectToRouteResult(new System.Web.Routing.RouteValueDictionary(new { controller = "Users", action = "Index", username = realUserName }));
}
}
Then on your ActionResult in your controller you could apply [UserFilter] to the action.
[UserFilter]
public ActionResult UnknownUserHandler() {
return View();
}
This should get you the results you're looking for. Any questions please post :)