CODEWITHSUNDEEP
javagwt
CVSaikrishna
CVSaikrishna

Reputation: 1

In GWT, an asynchrounous call is already in progress If we refresh the browser now, that event is firing but the process is not completing

In GWT, an asynchrounous call is already in progress and i will fire an event after completing this call. If we refresh the browser now, that event is firing but the process is not completing, how can i solve this. Please help.

This is the code block i am using:

 private void rpcMethod(final String nounToTrack, final ImportResultDTO importResult,         final String selectedNounName) {
        service.checkNounImportExportStatus(nounToTrack, new AsyncCallback<String>() {
            @Override
            public void onFailure(final Throwable caught) {
                if (caught instanceof StatusCodeException) {
                    eventBus.fireEvent(new CurrentNotificationChangedEvent(true));
                } else {
                    caught.printStackTrace();
                    rpcToRemoveNounImportExportStatusAttribute(nounToTrack);
                }
                clearDataGridHeaders();
            }

            @Override
            public void onSuccess(final String result) {

                if (result.equals(BodDeskMessageConstants.COMPLETED) || result.contains(BodDeskMessageConstants.EXCEPTIONSTATUS)) {
                    if (result.contains(BodDeskMessageConstants.EXCEPTIONSTATUS)) {
                        eventBus.fireEvent(new CurrentNotificationChangedEvent(true));
                    } else {
                        log.info("new notification is occurring..... 3");
                        eventBus.fireEvent(new CurrentNotificationChangedEvent(true));
                    }
                }  else {
                    rpcToCheckNounImportExportStatus(nounToTrack, importResult, selectedNounName);
                }
            }
        });
    }

if the rpc call failed/succeeded, we are firing an event to see the new notification avaialble. Now, i started this rpc call, i refreshed the browser while the rpc call is executing. The event is firing but the process is not completed. Please suggest how to restrict the firing of the event ?

Upvotes: 0

Views: 92

Answers (1)

Thomas Broyer
Thomas Broyer

Reputation: 64561

When you unload the page (which also happens when you refresh it), all ongoing requests are aborted and you get a StatusCodeException with a getStatusCode() of 0 (note: you'll get the same behavior whichever the trigger for aborting the request: network error, etc.)

You could then check the status code in your onFailure, but if you don't want false positives for other cases of status code 0, you'll have to listen for WindowClosingEvent and set a flag there. Just be sure to set the flag back at some other event (e.g. a successful response, or non-0 failure) in case the user cancels the navigation.

Upvotes: 1

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