C++ documentLoader函数代码示例

void MainResourceLoader::didFinishLoading(double finishTime)
{
    // There is a bug in CFNetwork where callbacks can be dispatched even when loads are deferred.
    // See <rdar://problem/6304600> for more details.
#if !USE(CF)
    ASSERT(shouldLoadAsEmptyDocument(frameLoader()->activeDocumentLoader()->url()) || !defersLoading());
#endif

    // The additional processing can do anything including possibly removing the last
    // reference to this object.
    RefPtr<MainResourceLoader> protect(this);
    RefPtr<DocumentLoader> dl = documentLoader();

    if (m_loadingMultipartContent)
        dl->maybeFinishLoadingMultipartContent();

    documentLoader()->timing()->setResponseEnd(finishTime ? finishTime : (m_timeOfLastDataReceived ? m_timeOfLastDataReceived : monotonicallyIncreasingTime()));
    frameLoader()->finishedLoading();
    ResourceLoader::didFinishLoading(finishTime);

    dl->applicationCacheHost()->finishedLoadingMainResource();
}

bool ApplicationCacheHost::maybeLoadFallbackForMainError(const ResourceRequest& request, const ResourceError& error)
{
    if (!error.isCancellation()) {
        ASSERT(!m_mainResourceApplicationCache);
        if (isApplicationCacheEnabled() && !isApplicationCacheBlockedForRequest(request)) {
            m_mainResourceApplicationCache = ApplicationCacheGroup::fallbackCacheForMainRequest(request, m_documentLoader);

            if (scheduleLoadFallbackResourceFromApplicationCache(documentLoader()->mainResourceLoader(), m_mainResourceApplicationCache.get()))
                return true;
        }
    }
    return false;
}

void MainResourceLoader::didFail(const ResourceError& error)
{
    if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForMainError(request(), error))
        return;

    // There is a bug in CFNetwork where callbacks can be dispatched even when loads are deferred.
    // See <rdar://problem/6304600> for more details.
#if !USE(CF)
    ASSERT(!defersLoading());
#endif
    
    receivedError(error);
}

unsigned long long PerformanceTiming::secureConnectionStart() const
{
    DocumentLoader* loader = documentLoader();
    if (!loader)
        return 0;

    const ResourceLoadTiming& timing = loader->response().resourceLoadTiming();
    
    if (timing.secureConnectionStart < 0)
        return 0;

    return resourceLoadTimeRelativeToAbsolute(timing.secureConnectionStart);
}

bool ResourceLoader::isInclusionRequest()
{
    DocumentLoader* loader = documentLoader();
    if (loader->frameLoader()->isLoadingMainFrame() && !loader->isLoadingSubresources())
        return false;
    else
        return true;

// for debug
// NF4_DP(("  => isLoadingMainResource(): %s", ((loader->isLoadingMainResource())?"true":"false")));
// NF4_DP(("  => isLoadingSubresources(): %s", ((loader->isLoadingSubresources())?"true":"false")));
// NF4_DP(("  => isLoadingMainFrame(): %s", ((loader->frameLoader()->isLoadingMainFrame())?"true":"false")));
// NF4_DP(("  => subframeIsLoading() : %s", ((loader->frameLoader()->subframeIsLoading())?"true":"false")));
}

bool ApplicationCacheHost::maybeLoadSynchronously(ResourceRequest& request, ResourceError& error, ResourceResponse& response, Vector<char>& data)
{
    ApplicationCacheResource* resource;
    if (shouldLoadResourceFromApplicationCache(request, resource)) {
        if (resource) {
            response = resource->response();
            data.append(resource->data()->data(), resource->data()->size());
        } else {
            error = documentLoader()->frameLoader()->client().cannotShowURLError(request);
        }
        return true;
    }
    return false;
}

void ResourceLoader::willSendRequest(ResourceRequest& request, const ResourceResponse& redirectResponse)
{
    // Protect this in this delegate method since the additional processing can do
    // anything including possibly derefing this; one example of this is Radar 3266216.
    Ref<ResourceLoader> protect(*this);

    ASSERT(!m_reachedTerminalState);

#if ENABLE(CONTENT_EXTENSIONS)
    ASSERT(m_resourceType != ResourceType::Invalid);

    if (frameLoader() && frameLoader()->frame().page() && frameLoader()->frame().page()->userContentController() && m_documentLoader)
        frameLoader()->frame().page()->userContentController()->processContentExtensionRulesForLoad(request, m_resourceType, *m_documentLoader);

    if (request.isNull()) {
        didFail(cannotShowURLError());
        return;
    }
#endif

    // We need a resource identifier for all requests, even if FrameLoader is never going to see it (such as with CORS preflight requests).
    bool createdResourceIdentifier = false;
    if (!m_identifier) {
        m_identifier = m_frame->page()->progress().createUniqueIdentifier();
        createdResourceIdentifier = true;
    }

    if (m_options.sendLoadCallbacks() == SendCallbacks) {
        if (createdResourceIdentifier)
            frameLoader()->notifier().assignIdentifierToInitialRequest(m_identifier, documentLoader(), request);

#if PLATFORM(IOS)
        // If this ResourceLoader was stopped as a result of assignIdentifierToInitialRequest, bail out
        if (m_reachedTerminalState)
            return;
#endif

        frameLoader()->notifier().willSendRequest(this, request, redirectResponse);
    }
    else
        InspectorInstrumentation::willSendRequest(m_frame.get(), m_identifier, m_frame->loader().documentLoader(), request, redirectResponse);

    if (!redirectResponse.isNull())
        platformStrategies()->loaderStrategy()->resourceLoadScheduler()->crossOriginRedirectReceived(this, request.url());

    m_request = request;

    if (!redirectResponse.isNull() && !m_documentLoader->isCommitted())
        frameLoader()->client().dispatchDidReceiveServerRedirectForProvisionalLoad();
}

void ApplicationCacheHost::stopDeferringEvents()
{
    RefPtr<DocumentLoader> protect(documentLoader());
    for (unsigned i = 0; i < m_deferredEvents.size(); ++i) {
        EventID id = m_deferredEvents[i];
        if (m_domApplicationCache) {
            ExceptionCode ec = 0;
            m_domApplicationCache->dispatchEvent(Event::create(DOMApplicationCache::toEventType(id), false, false), ec);
            ASSERT(!ec);
        }
    }
    m_deferredEvents.clear();
    m_defersEvents = false;
}

unsigned long long PerformanceTiming::secureConnectionStart() const {
  DocumentLoader* loader = documentLoader();
  if (!loader)
    return 0;

  ResourceLoadTiming* timing = loader->response().resourceLoadTiming();
  if (!timing)
    return 0;

  double sslStart = timing->sslStart();
  if (sslStart == 0.0)
    return 0;

  return monotonicTimeToIntegerMilliseconds(sslStart);
}

unsigned long long PerformanceTiming::secureConnectionStart() const
{
    DocumentLoader* loader = documentLoader();
    if (!loader)
        return 0;

    ResourceLoadTiming* timing = loader->response().resourceLoadTiming();
    if (!timing)
        return 0;

    int sslStart = timing->sslStart;
    if (sslStart < 0)
        return 0;

    return resourceLoadTimeRelativeToAbsolute(sslStart);
}

void MainResourceLoader::didReceiveResponse(const ResourceResponse& r)
{
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
    if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForMainResponse(request(), r))
        return;
#endif

    HTTPHeaderMap::const_iterator it = r.httpHeaderFields().find(AtomicString("x-frame-options"));
    if (it != r.httpHeaderFields().end()) {
        String content = it->second;
        if (m_frame->loader()->shouldInterruptLoadForXFrameOptions(content, r.url())) {
            cancel();
            return;
        }
    }

    // There is a bug in CFNetwork where callbacks can be dispatched even when loads are deferred.
    // See <rdar://problem/6304600> for more details.
#if !PLATFORM(CF)
    ASSERT(shouldLoadAsEmptyDocument(r.url()) || !defersLoading());
#endif

    if (m_loadingMultipartContent) {
        frameLoader()->setupForReplaceByMIMEType(r.mimeType());
        clearResourceData();
    }
    
    if (r.isMultipart())
        m_loadingMultipartContent = true;
        
    // The additional processing can do anything including possibly removing the last
    // reference to this object; one example of this is 3266216.
    RefPtr<MainResourceLoader> protect(this);

    m_documentLoader->setResponse(r);

    m_response = r;

    ASSERT(!m_waitingForContentPolicy);
    m_waitingForContentPolicy = true;
    ref(); // balanced by deref in continueAfterContentPolicy and didCancel
    frameLoader()->checkContentPolicy(m_response.mimeType(), callContinueAfterContentPolicy, this);
}

void ResourceLoader::didReceiveResponse(ResourceHandle*, const ResourceResponse& response)
{
#if ENABLE(INSPECTOR)
    if (InspectorTimelineAgent::instanceCount()) {
        InspectorTimelineAgent* timelineAgent = m_frame->page() ? m_frame->page()->inspectorTimelineAgent() : 0;
        if (timelineAgent)
            timelineAgent->willReceiveResourceResponse(identifier(), response);
    }
#endif
#if ENABLE(OFFLINE_WEB_APPLICATIONS)
    if (documentLoader()->applicationCacheHost()->maybeLoadFallbackForResponse(this, response))
        return;
#endif
    didReceiveResponse(response);
#if ENABLE(INSPECTOR)
    if (InspectorTimelineAgent::instanceCount()) {
        InspectorTimelineAgent* timelineAgent = m_frame->page() ? m_frame->page()->inspectorTimelineAgent() : 0;
        if (timelineAgent)
            timelineAgent->didReceiveResourceResponse();
    }
#endif
}

unsigned long long PerformanceTiming::connectStart() const
{
    DocumentLoader* loader = documentLoader();
    if (!loader)
        return domainLookupEnd();

    ResourceLoadTiming* timing = loader->response().resourceLoadTiming();
    if (!timing)
        return domainLookupEnd();

    // connectStart will be zero when a network request is not made.
    // Rather than exposing a special value that indicates no new connection, we "backfill" with domainLookupEnd.
    double connectStart = timing->connectStart;
    if (connectStart == 0.0 || loader->response().connectionReused())
        return domainLookupEnd();

    // ResourceLoadTiming's connect phase includes DNS, however Navigation Timing's
    // connect phase should not. So if there is DNS time, trim it from the start.
    if (timing->dnsEnd > 0.0 && timing->dnsEnd > connectStart)
        connectStart = timing->dnsEnd;

    return monotonicTimeToIntegerMilliseconds(connectStart);
}