所以我真的需要一些有用的提示来解决我在 GWTP 应用程序中遇到的问题，也许你们中的一个人以前遇到过这个问题。所以我使用 GWTP 1.1：
- com.gwtplatform.mvp.Mvp（不带入口点）
- com.gwtplatform.dispatch.Dispatch 与
- com.google.gwt.uibinder.UiBinder
我遇到的问题是，当我遇到客户端错误时（几乎可以在客户端的任何地方，不确定边界在哪里），我会收到一条与 GIN 相关的非常神秘的消息，而不是一条可以帮助我的消息解决问题。似乎与 GWTP 代理有关，这是我得到的典型消息：http: //pastebin.com/YgxPbkru真正的问题不是错误信息向我展示的内容。OpenIcidentPresenter 扩展了 IncidentPresenter，它是我为管理事件的生命周期而制作的 Presenter（在这种情况下），它扩展了我制作的另一个 Presenter，称为 RequestPresenter，这是一个 Presenter，允许用户将 PresenterWidget 类请求到其中（进入该演示者生命周期的任何给定插槽），这扩展了另一个名为 RichPresenter 的演示者，它几乎具有我所有演示者都需要的东西，例如页面加载指示和某些页面锁定等。以下是这些类：
OpenIncidentPresenter
public class OpenIncidentPresenter extends IncidentPresenter<OpenIncidentPresenter.MyView,
OpenIncidentPresenter.MyProxy> implements ViewUiHandlers, HasRequestedWidgets, NewIncidentHandler,
ChangeSectionHandler, ConfigureHandler {
public interface MyView extends View, HasUiHandlers<ViewUiHandlers> {
... Snip ...
}
@ProxyCodeSplit
@NameToken(NameTokens.open)
//@UseGatekeeper(LoginGatekeeper.class)
public interface MyProxy extends ProxyPlace<OpenIncidentPresenter> {
}
private static Logger logger = Logger.getLogger(OpenIncidentPresenter.class.getName());
Process process;
SectionTuple currentSection = new SectionTuple();
Map<Integer, SectionTuple> sections = new HashMap<Integer, SectionTuple>();
List<AccordionSection> sectionWigets = new ArrayList<AccordionSection>();
List<Activity> cachedActivities = new ArrayList<Activity>();
List<Authority> cachedAuthorities = new ArrayList<Authority>();
List<Severity> cachedSeverities = new ArrayList<Severity>();
List<Location> cachedLocations = new ArrayList<Location>();
List<Site> cachedSites = new ArrayList<Site>();
List<Area> cachedAreas = new ArrayList<Area>();
Severity currentSeverity;
boolean configured = false;
boolean changedConsequences = false;
final ImageResources imageResources;
RegisteredRequestWidget<ActionBarPresenterWidget> actionBarReg;
RegisteredRequestWidget<ProgressBarPresenterWidget> progressBarReg;
@Inject
public OpenIncidentPresenter(final EventBus eventBus, final MyView view,
final MyProxy proxy, final DispatchAsync dispatch,
final PlaceManager placeManager, ImageResources imageResources) {
super(eventBus, view, proxy, dispatch, placeManager);
this.imageResources = imageResources;
getView().setUiHandlers(this);
logger.log(Level.INFO, "Constructed OpenIncidentPresenter");
}
@Override
protected void revealInParent() {
RevealContentEvent.fire(this, ApplicationPresenter.SLOT_MIDDLE, this);
}
... Snip ...
}
事件主持人
public abstract class IncidentPresenter<T extends View,
H extends Proxy<?>> extends RequestPresenter<T, H> implements HasIncident {
Logger logger = Logger.getLogger(IncidentPresenter.class.getName());
public static final String INCIDENT_COOKIE = "incidentId";
public interface LoadCallback {
void onFinished();
}
protected Incident incident;
protected DispatchAsync dispatch;
private boolean loaded = false;
public IncidentPresenter(EventBus eventBus, T view, H proxy,
DispatchAsync dispatch, PlaceManager placeManager) {
super(eventBus, view, proxy, placeManager, true);
this.dispatch = dispatch;
}
public abstract void onFailureToLoadIncident(Integer incidentId);
public abstract void onLoadedIncident(Incident incident);
@Override
public void loadIncident(final Integer id) {
loadIncident(id, null);
}
@Override
public void loadIncident(final Integer id, final LoadCallback callback) {
.. Snip ..
}
/**
* Process the incident dependencies
*/
protected void loadDependencies(final Incident incident, final LoadCallback callback) {
.. Snip ..
}
@Override
public Incident getIncident() {
return incident;
}
@Override
public void setIncident(Incident incident) {
this.incident = incident;
if(hasIncident()) {
String incidentCookie = Cookies.getCookie("incidentId");
if(incidentCookie == null || !incidentCookie.equals(String.valueOf(
incident.getId()))) {
// Set the cookie to the new incident id
Cookies.setCookie("incidentId", String.valueOf(incident.getId()));
logger.log(Level.INFO, "Set incident " + String.valueOf(incident.getId())
+ " to the cookie session");
}
} else {
Cookies.removeCookie("incidentId");
logger.log(Level.INFO, "Set incident to null incident object, cleared " +
"the cookie session");
}
}
@Override
public boolean isIncidentLoaded() {
return hasIncident() && loaded;
}
@Override
public boolean hasIncident() {
return IncidentUtils.isValid(incident);
}
@Override
public void resetIncident() {
setIncident(null);
loaded = false;
}
@Override
public DispatchAsync getDispatch() {
return dispatch;
}
public String getIncidentCookie() {
return Cookies.getCookie(INCIDENT_COOKIE);
}
}
请求演示者
public abstract class RequestPresenter<T extends View, H extends Proxy<?>>
extends RichPresenter<T, H> implements HasRequestedWidgets {
RequestWidgetManager requestManager = new RequestWidgetManager(this);
public RequestPresenter(EventBus eventBus, T view, H proxy,
PlaceManager placeManager) {
this(eventBus, view, proxy, placeManager, false);
}
public RequestPresenter(EventBus eventBus, T view, H proxy,
PlaceManager placeManager, boolean leaveConfirmation) {
super(eventBus, view, proxy, placeManager, leaveConfirmation);
}
@Override
public void prepareFromRequest(PlaceRequest request) {
prepareFromRequest(request, null);
}
/**
* Alternative to {@link RequestPresenter#prepareFromRequest(PlaceRequest)} that
* will allow you to register the {@link FinalCallback} in case you have dependency
* on the request widgets.
* @param request
* @param callback
*/
public void prepareFromRequest(PlaceRequest request, FinalCallback callback) {
super.prepareFromRequest(request);
executeAfterRequesting(callback);
requestWidgets();
}
@Override
protected void onBind() {
super.onBind();
registerRequestWidgets();
}
@Override
protected void onUnbind() {
super.onUnbind();
unregisterRequestWidgets();
}
@Override
protected void onHide() {
super.onHide();
dismissWidgets();
}
@Override
protected void onReveal() {
super.onReveal();
requestWidgets();
}
private void requestWidgets() {
requestManager.requestAll();
onRequestWidgets();
}
private void dismissWidgets() {
requestManager.dismissAll();
onDismissWidgets();
}
public void unregisterRequestWidgets() {
requestManager.unregisterAllWidgets();
}
@Override
public abstract void registerRequestWidgets();
public void onRequestWidgets() {
// Do nothing by default
}
public void onDismissWidgets() {
// Do nothing by default
}
protected RequestWidgetManager getRequestManager() {
return requestManager;
}
/**
* This will execute the callback method when the final request is made on loading.<br>
* This must be set before super.onReveal or super.prepareFromRequest are called.
* Or use {@link RequestPresenter#prepareFromRequest(PlaceRequest, FinalCallback)} to
* set the final callback.
* @param callback
*/
public void executeAfterRequesting(FinalCallback callback) {
requestManager.setFinalCallback(callback);
}
public <P extends PresenterWidget<?>> RequestedWidget<P> getRequestedWidget(
RegisteredRequestWidget<P> registry) {
return requestManager.get(registry);
}
public <P extends PresenterWidget<?>> RegisteredRequestWidget<P> registerRequestWidget(
HasHandlers handler, Class<P> clazz, Object slot, boolean clearSlot) {
return registerRequestWidget(handler, clazz, slot, clearSlot, null);
}
public <P extends PresenterWidget<?>> RegisteredRequestWidget<P> registerRequestWidget(
HasHandlers handler, Class<P> clazz, Object slot, boolean clearSlot,
RequestWidgetEvent.Callback<P> callback) {
return requestManager.registerWidget(handler, clazz, slot, clearSlot, callback);
}
}
丰富的演示者
public abstract class RichPresenter<T extends View,
H extends Proxy<?>> extends Presenter<T, H> {
protected final PlaceManager placeManager;
private boolean leaveConfirmation;
private String defaultLeaveMessage = "Any unsaved work will be lost when " +
"leaving this page, are you sure you would like to leave?";
public RichPresenter(EventBus eventBus, T view, H proxy,
PlaceManager placeManager) {
this(eventBus, view, proxy, placeManager, false);
}
public RichPresenter(EventBus eventBus, T view, H proxy,
PlaceManager placeManager, boolean leaveConfirmation) {
super(eventBus, view, proxy);
this.placeManager = placeManager;
this.leaveConfirmation = leaveConfirmation;
}
/**
* Setup component control handlers for the UI
*/
protected void setupHandlers(final T view) {
// Do nothing by default
}
@Override
public void prepareFromRequest(PlaceRequest request) {
super.prepareFromRequest(request);
// Start Load Indicator
LoadingIndicatorEvent.fire(this, true);
// Attempt to set leave confirmation
setLeaveConfirmation(leaveConfirmation);
}
@Override
protected void onBind() {
super.onBind();
setupHandlers(getView());
}
@Override
protected void onUnbind() {
super.onUnbind();
// Remove all the event handlers
for(HandlerRegistration reg : handlerRegistrations) {
reg.removeHandler();
}
handlerRegistrations.clear();
}
@Override
protected void onReveal() {
super.onReveal();
// Stop Load Indicator
LoadingIndicatorEvent.fire(this, true);
// Attempt to set leave confirmation
setLeaveConfirmation(leaveConfirmation);
}
@Override
protected void onReset() {
super.onReset();
// Stop Load Indicator
LoadingIndicatorEvent.fire(this, false);
}
/**
* Set the page leave confirmation.
* @param leaveConfirmation
*/
public void setLeaveConfirmation(boolean leaveConfirmation) {
this.leaveConfirmation = leaveConfirmation;
if(leaveConfirmation && !BrowserUtils.isIEBrowser()) {
placeManager.setOnLeaveConfirmation(defaultLeaveMessage);
} else {
placeManager.setOnLeaveConfirmation(null);
}
}
public boolean isConfirmOnLeave() {
return leaveConfirmation;
}
public String getDefaultLeaveMessage() {
return defaultLeaveMessage;
}
public void setDefaultLeaveMessage(String message) {
this.defaultLeaveMessage = message;
}
}
我觉得这可能是一个促成因素。我有一大串演示者，我可能实施错误。
这让我很难识别客户端代码中的问题。我必须完成我的更改，还原它们，直到我不再收到此消息。这太荒谬了。如果您发现我做错了什么或需要更多信息，请告诉我！将不胜感激。
干杯! 本