I have a Smart GWT Project where the data that is to be displayed on screen, is stored in a class that is shared by client and server.
I read some docs at the Smart GWT website where they have explained how to connect to XML or JSON data sources.
What I want to do is link my POJO with the Smart GWT widget.
And the data is available client-side, so the server-side data communication component of Smart GWT(Which is only available in paid editions)is not needed.
What is the recommended way to go about implementing this? Are there any best practices while doing this? And am I correct in assuming that I can do the above with the Free edition of Smart GWT?
You must manually add a POJO's fields to attributes of record. We can not simply pass the object as a value in grid. I did it so:
greetingService
.getUsersList(new AsyncCallback<ArrayList<UserForRPC>>() {
public void onFailure(Throwable caught) {
}
public void onSuccess(ArrayList<UserForRPC> result) {
ListGridRecord[] listUsers = new ListGridRecord[result.size()];
int recordNum = 0;
for (UserForRPC user : result) {
ListGridRecord record = new ListGridRecord();
record.setAttribute("id", user.getId());
record.setAttribute("firstName", user.getFirstName());
record.setAttribute("lastName", user.getLastName());
record.setAttribute("login", user.getLogin());
record.setAttribute("password", user.getPassword());
record.setAttribute("email", user.getEmail());
record.setAttribute("role", user.getRole());
record.setAttribute("organization", user.getOrganization());
listUsers[recordNum++] = record;
}
usersGrid.setData(listUsers);
}
});
Related
I have a use case where I need to fetch the ids of my entire solr collection. For that, with solrj, I use the Streaming API like this :
CloudSolrServer server = new CloudSolrServer("zkHost1:2181,zkHost2:2181,zkHost3:2181");
SolrQuery query = new SolrQuery("*:*");
server.queryAndStreamResponse(tmpQuery, handler);
Where handler is a class that implements StreamingResponseCallback, ommited in my code for brevity.
Now, the Spring data repositories abstraction give me the ability to search by pages, by cursors, but I can't seem to find a way to handle the streaming use case.
Is there a workaround ?
SolrTemplate allows to access the underlying SolrClient in a callback style. So you could use that one to work around the current limitations.
The result conversion using the MappingSolrConverter available via the SolrTemplate is broken at the moment (I need to check why) - but you get the idea of how to do it.
solrTemplate.execute(new SolrCallback<Void>() {
#Override
public Void doInSolr(SolrClient solrClient) throws SolrServerException, IOException {
SolrQuery sq = new SolrQuery("*:*");
solrClient.queryAndStreamResponse("collection1", sq, new StreamingResponseCallback() {
#Override
public void streamSolrDocument(SolrDocument doc) {
// the bean conversion fails atm
// ExampleSolrBean bean = solrTemplate.getConverter().read(ExampleSolrBean.class, doc);
System.out.println(doc);
}
#Override
public void streamDocListInfo(long numFound, long start, Float maxScore) {
// do something useful
}
});
return null;
}
});
I'm currently working on a simple GWT project. One of the things I'd like to do is that when the page loads I can dynamically populate the contents of a ListBox based on certain criteria. I actually don't see any handlers for a ListBox to handle the initial render event but I see change handlers.
How does one populate a ListBox contents with data from the server side on pageload with GWT?
Right now I have a class that implements EntryPoint that has a
final ListBox fooList = new ListBox();
I also have a set of beans but I also have a class implementing RemoteService. Since I can't seem to get direct calls to my user defined packages directly in the EntryPoint (which makes sense) how do I populate that ListBox with server side content on initial page load? Right now I'm using a List but I figure if I cant get that to work I can get a DB call to work...
I've tried things in the EntryPoint like:
for (String name : FOOS) {
fooList.addItem(name, name);
}
However FOOS would derive from a server side data and the EntryPoint is supposed to be largerly limited to what can compile to JS! I can't get user defined classes to be recognized on that side as that string is the result of a set of user defined classes.
I also tried creating a method in the class implementing RemoteService that returns a ListBox. This also didn't compile when I tried to call this method. Perhaps I don't fully understand how to call methods in a RemoteService service implementing class.
I've searched a lot and I can't find anything that clearly explains the fundamentals on this. My background is much more ASP.NET and JSPs so perhaps I'm missing something.
I'm using GWT 2.6 is that is relevant.
The usual procedure is the following:
Create a bean class for the data you want to transmit between client and server. Let's call it MyBean.
Place MyBean in the shared package of your project.
This class has to implement either Serializable or IsSerializable, otherwise GWT will complain that it doesn't know how to transmit it.
Create your RemoteService that contains the method you want to use to transmit MyBean from/to the server.
Once you get your data on the client using an AsyncCallback and your RemoteService, fill the ListBox using your beans, e.g. by calling MyBean#getName() or MyBean#toString().
Success!
I based my example on the GWT sample project ( I named it example), just replace the classes and it should work :
public class Example implements EntryPoint {
/**
* Create a remote service proxy to talk to the server-side Greeting
* service.
*/
private final GreetingServiceAsync greetingService = GWT
.create(GreetingService.class);
/**
* This is the entry point method.
*/
public void onModuleLoad() {
final ListBox listBox = new ListBox();
RootPanel.get("sendButtonContainer").add(listBox);
greetingService.getSomeEntries(new AsyncCallback<String[]>() {
#Override
public void onSuccess(String[] result) {
for (int i = 0; i < result.length; i++) {
listBox.addItem(result[i]);
}
}
#Override
public void onFailure(Throwable caught) {
}
});
}
}
This is our EntryPoint, it creates a listbox and calls the server with a AsyncCallback to get some dynamic data. If the call is successfull (onSuccess), the data is written into the listbox.
The GreetingService interface define the synchronous methods, it is implemented in the GreetingServiceImpl class :
#RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
String[] getSomeEntries() ;
}
The asynchronous counterpart is the GreetingServiceAsync interface, we used it before to call the server :
public interface GreetingServiceAsync {
void getSomeEntries(AsyncCallback<String[]> callback) ;
}
The GreetingServiceImpl class is located on the server. Here you could call for example a database:
#SuppressWarnings("serial")
public class GreetingServiceImpl extends RemoteServiceServlet implements
GreetingService {
#Override
public String[] getSomeEntries() {
String[] entries = { "Entry 1","Entry 2","Entry 3" };
return entries;
}
}
Now if you want to use some Bean/Pojo between the server and client, replace the String[] in each class/interface with the object name, put the class in the shared package and consider that it implements Serializable/IsSerializable.
How to restrict a CQ5/Custom component to add only once per page.? I want to restrict the drag and drop of component into the page when the author is going to add the same component for the second time into the same page.
One option is to include the component directly in the JSP of the template and exclude it from the list of available components in the sidekick. To do so, add the component directly to your JSP (foundation carousel in this example):
<cq:include path="carousel" resourceType="foundation/components/carousel" />
To hide the component from the sidekick, either set:
componentGroup: .hidden
or exclude it from the list of "Allowed Components" using design mode.
If you need to allow users to create a page without this component you can provide a second template with the cq:include omitted.
Thanks Rampant, I have followed your method and link stated.
Posting link again : please follow this blog
It was really helpful. I am posting the implementation whatever I have done.
It worked fine for me. One can definitely improve the code quality, this is raw code and is just for reference.
1.Servlet Filter
Keep this in mind that,if any resource gets refereshed, this filter will execute. So you need to filter the contents at your end for further processing.
P.S. chain.doFilter(request,response); is must. or cq will get hanged and nothing will be displayed.
#SlingFilter(generateComponent = false, generateService = true, order = -700,
scope = SlingFilterScope.REQUEST)
#Component(immediate = true, metatype = false)
public class ComponentRestrictorFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {}
#Reference
private ResourceResolverFactory resolverFactory;
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
WCMMode mode = WCMMode.fromRequest(request);
if (mode == WCMMode.EDIT) {
SlingHttpServletRequest slingRequest = (SlingHttpServletRequest) request;
PageManager pageManager = slingRequest.getResource().getResourceResolver().adaptTo(PageManager.class);
Page currentPage = pageManager.getContainingPage(slingRequest.getResource());
logger.error("***mode" + mode);
if (currentPage != null )) {
ComponentRestrictor restrictor = new ComponentRestrictor(currentPage.getPath(), RESTRICTED_COMPONENT);
restrictor.removeDuplicateEntry(resolverFactory,pageManager);
}
chain.doFilter(request, response);
}
}
public void destroy() {}
}
2.ComponentRestrictor class
public class ComponentRestrictor {
private String targetPage;
private String component;
private Pattern pattern;
private Set<Resource> duplicateResource = new HashSet<Resource>();
private Logger logger = LoggerFactory.getLogger(ComponentRestrictor.class);
private Resource resource = null;
private ResourceResolver resourceResolver = null;
private ComponentRestrictorHelper helper = new ComponentRestrictorHelper();
public ComponentRestrictor(String targetPage_, String component_){
targetPage = targetPage_ + "/jcr:content";
component = component_;
}
public void removeDuplicateEntry(ResourceResolverFactory resolverFactory, PageManager pageManager) {
pattern = Pattern.compile("([\"']|^)(" + component + ")(\\S|$)");
findReference(resolverFactory, pageManager);
}
private void findReference(ResourceResolverFactory resolverFactory, PageManager pageManager) {
try {
resourceResolver = resolverFactory.getAdministrativeResourceResolver(null);
resource = resourceResolver.getResource(this.targetPage);
if (resource == null)
return;
search(resource);
helper.removeDuplicateResource(pageManager,duplicateResource);
} catch (LoginException e) {
logger.error("Exception while getting the ResourceResolver " + e.getMessage());
}
resourceResolver.close();
}
private void search(Resource parentResource) {
searchReferencesInContent(parentResource);
for (Iterator<Resource> iter = parentResource.listChildren(); iter.hasNext();) {
Resource child = iter.next();
search(child);
}
}
private void searchReferencesInContent(Resource resource) {
ValueMap map = ResourceUtil.getValueMap(resource);
for (String key : map.keySet()) {
if (!helper.checkKey(key)) {
continue;
}
String[] values = map.get(key, new String[0]);
for (String value : values) {
if (pattern.matcher(value).find()) {
logger.error("resource**" + resource.getPath());
duplicateResource.add(resource);
}
}
}
}
}
3.To remove the node/ resource
Whichever resource you want to remove/delete just use PageManager api
pageManeger.delete(resource,false);
That's it !!! You are good to go.
None of the options looks easy to implement. The best approach I found is to use the ACS Commons Implementation which is very easy and can be adopted into any project.
Here is the link and how to configure it:
https://github.com/Adobe-Consulting-Services/acs-aem-commons/pull/639
Enjoy coding !!!
you can't prevent that without doing some massive hacking to the ui code, and even then, you've only prevented it from one aspect of the ui. there's still crxde, and then the ability to POST content.
if this is truly a requirement, the best approach might be the following:
have the component check for a special value in the pageContext object (use REQUEST_SCOPE)
if value is not found, render component and set value
otherwise, print out a message that component can only be used once
note that you can't prevent a dialog from showing, but at the very least the author has an indication that that particular component can only be used once.
It sounds like there needs to be clarification of requirements (and understanding why).
If the authors can be trained, let them manage limits of components through authoring and review workflows.
If there is just 1 fixed location the component can appear, then the page component should include the content component, and let the component have an "enable" toggle property to determine if it should render anything. The component's group should be .hidden to prevent dragging from the sidekick.
If there is a fixed set of locations for the component, the page component can have a dropdown of the list of locations (including "none"). The page render component would then conditionally include the component in the correct location. Again, prevent dragging the component from the sidekick.
In the "hard to imagine" case that the component can appear anywhere on the page, added by authors, but limited to only 1 instance - use a wrapper component to manage including the (undraggable) component. Let the authors drag the wrapper on the page as many times as they want, but the wrapper should query the page's resources and determine if it is the first instance, and if so, include the end component. Otherwise, the wrapper does nothing.
In our experience (>2years on CQ), implementing this type of business rules via code creates a brittle solution. Also, requirements have a habit of changing. If enforced via code, development work is required instead of letting authors make changes faster & elegantly.
None of these options are that great. If you truly want a robust solution to this problem (limit the number of items on the page without hardcoding location) then the best way is with a servlet filter chain OSGI service where you can administer the number of instances and then use a resource resolver to remove offending instances.
The basic gist is:
Refresh the page on edit using cq:editConfig
Create an OSGI service implementing javax.servlet.Filter that encapsulates your business rules.
Use the filter to remove excess components according to business rules
Continue page processing.
For more details see here:
Using a servlet filter to limit the number of instances of a component per page or parsys
This approach will let you administer the number of items per page or per parsys and apply other possibly complex business rules in a way that the other offered solutions simply cannot.
Im using custom editor in Spring MVC to map string valuest to my domain objects. Simple case: User object refers to Company (User.company -> Company). In User form I register data binder:
protected void initBinder(WebDataBinder binder) throws Exception {
binder.registerCustomEditor(Company.class, new CompanyEditor(appService));
}
Editor is defined as folows:
class CompanyEditor extends PropertyEditorSupport {
private AppService appService;
public CompanyEditor(AppService appService) {
this.appService = appService;
}
public void setAsText(String text) {
Company company = appService.getCompany(text);
setValue(company);
}
public String getAsText() {
Company company = (Company) this.getValue();
if (company != null)
return company.getId();
return null;
}
}
When I use dropdown in my form
<form:select path="company">
<form:options items="${companies}" itemLabel="name" itemValue="id"/>
</form:select>
I experience severe performance problems because (to check if company is selected, I suppose) fires setAsText and getAsText for each option, which makes it to run a SQL query for each company.
I thought that setAsText is used when I commit form to make application know how to translate compnany id to Company (persisted) object. Why should it fire it in dropdowns. Any ideas how to fix it?
If your form backing object is stored as session attribute(i.e. you have something like #SessionAttributes("command") in your controller), so you can try to modify your setAsText(String text) method
public void setAsText(String text) {
Company currentCompany = (Company) this.getValue();
if ((currentCompany != null) && (currentCompany.getId().equals(text)))
return;
Company company = appService.getCompany(text);
setValue(company);
}
but I think that Spring 3.1 #Cacheable abstraction was introduced exactly for the such kind of things and is preferable
see examples in documentation
#Cacheable("books")
public Book findBook(ISBN isbn) {...}
P.S. Consider using new Converter SPI instead of Property Editors.
In general, it's possible to implement a generic converter for your look-up entities, so it will automatically convert entities from text using id if they have some specific attribute, for example, in one of my projects all #Entity types are being automatically converted using a global ConditionalGenericConverter implementation, so I neither register custom property editors during binding nor implement specific converters for types which are simple #Entity classes with #Id annotated primary keys.
Also it's very convenient when Spring automatically converts textual object ids to the actual entities when they are specified as #RequestParam annotated controller method arguments.
Does anyone know for an example of GWT's CellTable using RequestFactory and that table is being edited? I would like to list objects in a table (each row is one object and each column is one property), be able to easily add new objects and edit. I know for Google's DynaTableRf example, but that one doesn't edit.
I searched Google and stackoverflow but wasn't able to find one. I got a bit confused with RF's context and than people also mentioned some "driver".
To demonstrate where I currently arrived, I attach code for one column:
// Create name column.
Column<PersonProxy, String> nameColumn = new Column<PersonProxy, String>(
new EditTextCell()) {
#Override
public String getValue(PersonProxy person) {
String ret = person.getName();
return ret != null ? ret : "";
}
};
nameColumn.setFieldUpdater(new FieldUpdater<PersonProxy, String>() {
#Override
public void update(int index, PersonProxy object, String value) {
PersonRequest req = FaceOrgFactory.getInstance().requestFactory().personRequest();
PersonProxy eObject = req.edit(object);
eObject.setName(value);
req.persist().using(eObject).fire();
}
});
and my code for data provider:
AsyncDataProvider<PersonProxy> personDataProvider = new AsyncDataProvider<PersonProxy>() {
#Override
protected void onRangeChanged(HasData<PersonProxy> display) {
final Range range = display.getVisibleRange();
fetch(range.getStart());
}
};
personDataProvider.addDataDisplay(personTable);
...
private void fetch(final int start) {
lastFetch = start;
requestFactory.personRequest().getPeople(start, numRows).fire(new Receiver<List<PersonProxy>>() {
#Override
public void onSuccess(List<PersonProxy> response) {
if (lastFetch != start){
return;
}
int responses = response.size();
if (start >= (personTable.getRowCount()-numRows)){
PersonProxy newP = requestFactory.personRequest().create(PersonProxy.class);
response.add(newP);
responses++;
}
personTable.setRowData(start, response);
personPager.setPageStart(start);
}
});
requestFactory.personRequest().countPersons().fire(new Receiver<Integer>() {
#Override
public void onSuccess(Integer response) {
personTable.setRowCount(response+1, true);
}
});
}
I try to insert last object a new empty object. And when user would fill it, I'd insert new one after it. But the code is not working. I says that user is "attempting" to edit a object previously edited by another RequestContext.
Dilemmas:
* am I creating too many context'es?
* how to properly insert new object into celltable, created on the client side?
* on fieldUpdater when I get an editable object - should I insert it back to table or forget about it?
Thanks for any help.
am I creating too many context'es?
Yes.
You should have one context per HTTP request (per fire()), and a context that is not fire()d is useless (only do that if you/the user change your/his mind and don't want to, e.g., save your/his changes).
You actually have only one context to remove here (see below).
Note that your approach of saving on each field change can lead to "race conditions", because a proxy can be edit()ed by at most one context at a time, and it remains attached to a context until the server responds (and once a context is fired, the proxy is frozen –read-only– also until the server responds).
(this is not true in all cases: when onConstraintViolation is called, the context and its proxies are unfrozen so you can "fix" the constraint violations and fire the context again; this should be safe because validation is done on the server-side before any service method is called).
how to properly insert new object into celltable, created on the client side?
Your code looks OK, except that you should create your proxy in the same context as the one you'll use to persist it.
on fieldUpdater when I get an editable object - should I insert it back to table or forget about it?
I'm not 100% certain but I think you should refresh the table (something like setRowData(index, Collections.singletonList(object)))
BTW, the driver people mention is probably the RequestFactoryEditorDriver from the Editor framework. It won't help you here (quite the contrary actually).