public ComponentEventRequestHandlerImpl(ComponentEventResultProcessor resultProcessor,
    RequestPageCache cache,
    Response response,
    ActionRenderResponseGenerator generator,
    Environment environment) 
{
        this.resultProcessor = resultProcessor;
        this.cache = cache;
        this.response = response;
        this.generator = generator;
        this.environment = environment;
}

 public  void handle(ComponentEventRequestParameters parameters) throws IOException 
{
        Page activePage = cache.get(parameters.getActivePageName());
        ComponentResultProcessorWrapper callback = new ComponentResultProcessorWrapper(resultProcessor);
        // If activating the page returns a "navigational result", then don't trigger the action
        // on the component.
        activePage.getRootElement().triggerContextEvent(EventConstants.ACTIVATE,
                                                        parameters.getPageActivationContext(), callback);
        if (callback.isAborted()) return;
        Page containerPage = cache.get(parameters.getContainingPageName());
        ComponentPageElement element = containerPage.getComponentElementByNestedId(parameters.getNestedComponentId());
        environment.push(ComponentEventResultProcessor.class, resultProcessor);
        boolean handled = element.triggerContextEvent(parameters.getEventType(), parameters.getEventContext(),
                                                      callback);
        if (!handled)
            throw new TapestryException(ServicesMessages.eventNotHandled(element, parameters.getEventType()), element,
                                        null);
        environment.pop(ComponentEventResultProcessor.class);
        if (callback.isAborted()) return;
        if (!response.isCommitted()) generator.generateResponse(activePage);
}