1、下载回调接口
Source/WebCore/loader/DocumentLoader.cpp 798
798 if (!m_mainResourceLoader->load(m_request, m_substituteData))590 bool MainResourceLoader::load(const ResourceRequest& r, const SubstituteData& substituteData)
612 if (loadNow(request)) 
{
557 bool MainResourceLoader::loadNow(ResourceRequest& r)
586 m_handle = ResourceHandle::create(m_frame->loader()->networkingContext(), r, this, false, true); Source/WebCore/platform/network/ResourceHandle.cpp 56 //与附件js下载同
56 PassRefPtr<ResourceHandle> ResourceHandle::create(NetworkingContext* context, const ResourceRequest& request,
ResourceHandleClient* client, bool defersLoading, bool shouldContentSniff)//client即为上面的MainResourceLoader类对象,如下
//Source/WebCore/loader/MainResourceLoader.h
48 class MainResourceLoader : public ResourceLoader {
//Source/WebCore/loader/ResourceLoader.h
51 class ResourceLoader : public RefCounted<ResourceLoader>, protected ResourceHandleClient { 66 RefPtr<ResourceHandle> newHandle(adoptRef(new ResourceHandle(request, client, defersLoading, shouldContentSniff)));
71 if (newHandle->start(context)) Source/WebCore/platform/network/qt/ResourceHandleQt.cpp 82
qt等接口必须实现‘Source/WebCore/platform/network/ResourceHandle.h 216’文件中的‘216 bool start(NetworkingContext*);’
82 bool ResourceHandle::start(NetworkingContext* context)//从这里看this为此类对象
100 d->m_job = new QNetworkReplyHandler(this, QNetworkReplyHandler::AsynchronousLoad, d->m_defersLoading); Source/WebCore/platform/network/qt/QNetworkReplyHandler.cpp 373
373 QNetworkReplyHandler::QNetworkReplyHandler(ResourceHandle* handle, LoadType loadType, bool deferred)
401 m_queue.push(&QNetworkReplyHandler::start);
161 void QNetworkReplyHandlerCallQueue::push(EnqueuedCall method)
// 49 typedef void (QNetworkReplyHandler::*EnqueuedCall)();
162 {
163 m_enqueuedCalls.append(method);
164 flush();//从头开始取出enque队列中的所有函数元素（这里第一个为为method，即start函数），并调用函数
165 }
//建立连接、发送html请求
659 void QNetworkReplyHandler::start()
660 {
661 ResourceHandleInternal* d = m_resourceHandle->getInternal();
665 QNetworkReply* reply = sendNetworkRequest(d->m_context->networkAccessManager(), d->m_firstRequest);//连接http服务器，由QNetworkAccessManager管理下载
669 m_replyWrapper = new QNetworkReplyWrapper(&m_queue, reply, m_resourceHandle->shouldContentSniff() && d->m_context->mimeSniffingEnabled(), this);
208 QNetworkReplyWrapper::QNetworkReplyWrapper(QNetworkReplyHandlerCallQueue* queue, QNetworkReply* reply, bool sniffMIMETypes,
QObject* parent)
209 : QObject(parent)
210 , m_reply(reply)
211 , m_queue(queue)
212 , m_responseContainsData(false)
213 , m_sniffMIMETypes(sniffMIMETypes)
214 {
215 Q_ASSERT(m_reply);
216
217 // setFinished() must be the first that we connect, so isFinished() is updated when running other slots.
//QT通过此种方式异步回调(yes, 信号、槽机制，http://www.ibm.com/developerworks/cn/linux/guitoolkit/qt/signal-slot/ ),当下载完毕时QNetworkReply对象将emit finish()信号(./WebKitBuild/Debug/WebCore/moc_QNetworkReplyHandler.cpp)，将调用本对象的setFinished()等函数
218 connect(m_reply, SIGNAL(finished()), this, SLOT(setFinished()));
219 connect(m_reply, SIGNAL(finished()), this, SLOT(receiveMetaData()));
220 connect(m_reply, SIGNAL(readyRead()), this, SLOT(receiveMetaData()));
221 }
671 if (m_loadType == SynchronousLoad) {
673 // If supported, a synchronous request will be finished at this point, no need to hook up the signals.
672 m_replyWrapper->synchronousLoad();//支持同步下载？？（不支持）
674 return;
675 }
679 } 下载完毕之后 (setFinished(), receiveMetaData())
261 void QNetworkReplyWrapper::receiveMetaData()
262 {
263 // This slot is only used to receive the first signal from the QNetworkReply object.
//断开下载器的所有信号
264 resetConnections();
288 m_sniffer = new QtMIMETypeSniffer(m_reply, m_advertisedMIMEType, isSupportedImageType);
289
290 if (m_sniffer->isFinished()) {
291 receiveSniffedMIMEType();
--->
298 void QNetworkReplyWrapper::receiveSniffedMIMEType()
299 {
305 emitMetaDataChanged();
306 } --->
318 void QNetworkReplyWrapper::emitMetaDataChanged()
319 {
320 QueueLocker lock(m_queue);
//反馈给上层：MainResourceLoader；checkContentPolicy
321 m_queue->push(&QNetworkReplyHandler::sendResponseIfNeeded);
322
323 if (m_reply->bytesAvailable()) {
324 m_responseContainsData = true;
//将下载到的数据传递给上层处理：ResourceLoader::didReceiveData->MainResourceLoader::didReceiveData->ResourceLoader::didReceiveData
325 m_queue->push(&QNetworkReplyHandler::forwardData);
326 }
327
328 if (isFinished()) {
//判断是否重定向，是的话再start()；否则调用上层的didFinishLoading:ResourceLoader::didFinishLoading->MainResourceLoader::didFinishLoading->FrameLoader::finishedLoading
329 m_queue->push(&QNetworkReplyHandler::finish);
330 return;
332
333 // If not finished, connect to the slots that will be used from this point on.
//附件js的下载将会执行到这一步：QNetworkReplyWrapper::didReceiveFinished->QNetworkReplyHandler::finish->client->didFinishLoading(m_cachedResourceLoader->decrementRequestCount、m_cachedResourceLoader->loadDone)
334 connect(m_reply, SIGNAL(readyRead()), this, SLOT(didReceiveReadyRead()));
335 connect(m_reply, SIGNAL(finished()), this, SLOT(didReceiveFinished()));
331 }
336 }
292 return;
293 }
296 } Source/WebCore/platform/network/qt/QNetworkReplyHandler.cpp :264【
修改原始代码，使之以同步的方式下载网页（不会用到qt复杂的信号处理机制）——
无效，客户端无反应！
Source/WebCore/platform/network/qt/ResourceHandleQt.cpp 100100 d->m_job = new QNetworkReplyHandler(this, QNetworkReplyHandler::AsynchronousLoad, d->m_defersLoading);——>
100 d->m_job = new QNetworkReplyHandler(this, QNetworkReplyHandler::SynchronousLoad, d->m_defersLoading);】
修改代码
Source/WebCore/platform/network/qt/QNetworkReplyHandler.cpp
947 client->didReceiveData(m_resourceHandle, data.constData(), data.length(), -1);
948 client->didFinishLoading(m_resourceHandle, 0); 2、js附件资源回调接口
Source/WebCore/dom/ScriptElement.cpp:255
245 bool ScriptElement::requestScript(const String& sourceUrl)
255 m_cachedScript = m_element->document()->cachedResourceLoader()->requestScript(sourceUrl, scriptCharset()); 178 CachedScript* CachedResourceLoader::requestScript(const String& url, const String& charset)
179 {
180 return static_cast<CachedScript*>(requestResource(CachedResource::Script, url, charset));
181 }
300 CachedResource* CachedResourceLoader::requestResource(CachedResource::Type type, const String& resourceURL, const String& charset, ResourceLoadPriority priority, bool forPreload)
324 CachedResource* resource = memoryCache()->resourceForURL(url);
328 resource = loadResource(type, url, charset, priority);
377 CachedResource* CachedResourceLoader::loadResource(CachedResource::Type type, const KURL& url, const String& charset, ResourceLoadPriority priority)
383 CachedResource* resource = createResource(type, url, charset);
385 bool inCache = memoryCache()->add(resource);
393 resource->load(this); Source/WebCore/loader/cache/CachedResource.h 84
84 virtual void load(CachedResourceLoader* cachedResourceLoader) { load(cachedResourceLoader, false, DoSecurityCheck, true); } Source/WebCore/loader/cache/CachedResource.cpp 130
130 void CachedResource::load(CachedResourceLoader* cachedResourceLoader, bool incremental, SecurityCheckPolicy securityCheck, bool sendResourceLoadCallbacks)
131 {
132 m_sendResourceLoadCallbacks = sendResourceLoadCallbacks;
133 cachedResourceLoader->load(this, incremental, securityCheck, sendResource
537 void CachedResourceLoader::load(CachedResource* resource, bool incremental, SecurityCheckPolicy securityCheck, bool sendResourceLoadCallbacks)
538 {
539 incrementRequestCount(resource);
541 RefPtr<CachedResourceRequest> request = CachedResourceRequest::load(this, resource, incremental, securityCheck, sendResourceLoadCallbacks); LoadCallbacks);//this指向script类型的CachedResource Source/WebCore/loader/cache/CachedResourceLoader.cpp 537
537 void CachedResourceLoader::load(CachedResource* resource, bool incremental, SecurityCheckPolicy securityCheck, bool sendResourceLoadCallbacks)
538 {
539 incrementRequestCount(resource);
541 RefPtr<CachedResourceRequest> request = CachedResourceRequest::load(this, resource, incremental, securityCheck, sendResourceLoadCallbacks); Source/WebCore/loader/cache/CachedResourceRequest.cpp 89
89 PassRefPtr<CachedResourceRequest> CachedResourceRequest::load(CachedResourceLoader* cachedResourceLoader, CachedResource* resource, bool incremental, SecurityCheckPolicy securityCheck, bool sendResourceLoadCallbacks)
90 {
91 RefPtr<CachedResourceRequest> request = adoptRef(new CachedResourceRequest(cachedResourceLoader, resource, incremental));
92
93 ResourceRequest resourceRequest(resource->url());
124 RefPtr<SubresourceLoader> loader = resourceLoadScheduler()->scheduleSubresourceLoad(cachedResourceLoader->document()->frame(),
125 request.get(), resourceRequest, priority, securityCheck, sendResourceLoadCallbacks);
126 if (!loader || loader->reachedTerminalState()) {
127 // FIXME: What if resources in other frames were waiting for this revalidation?
128 LOG(ResourceLoading, "Cannot start loading '%s'", resource->url().latin1().data());//出错 Source/WebCore/loader/ResourceLoadScheduler.cpp 86
86 PassRefPtr<SubresourceLoader> ResourceLoadScheduler::scheduleSubresourceLoad(Frame* frame, SubresourceLoaderClient* client, const ResourceRequest& request, ResourceLoadPriority priority, SecurityCheckPolicy securityCheck,
87 bool sendResourceLoadCallbacks, bool shouldContentSniff, const String& optionalOutgoingReferrer)
88 {
89 RefPtr<SubresourceLoader> loader = SubresourceLoader::create(frame, client, request, securityCheck, sendResourceLoadCallbacks, shouldContentSniff, optionalOutgoingReferrer);
90 if (loader)
91 scheduleLoad(loader.get(), priority);
108 void ResourceLoadScheduler::scheduleLoad(ResourceLoader* resourceLoader, ResourceLoadPriority priority)
117 HostInformation* host = hostForURL(resourceLoader->url(), CreateIfNotFound);
123 servePendingRequests(host, priority);
181 void ResourceLoadScheduler::servePendingRequests(HostInformation* host, ResourceLoadPriority minimumPriority)
186 HostInformation::RequestQueue& requestsPending = host->requestsPending(ResourceLoadPriority(priority));
187
188 while (!requestsPending.isEmpty()) {
189 RefPtr<ResourceLoader> resourceLoader = requestsPending.first();
201 resourceLoader->start(); Source/WebCore/loader/ResourceLoader.cpp 142
142 void ResourceLoader::start()
164 m_handle = ResourceHandle::create(m_frame->loader()->networkingContext(), m_request, this, m_defersLoading, m_shouldContentSniff); Source/WebCore/platform/network/ResourceHandle.cpp 56 //
与上同 3、图片资源回调接口
同2
4、重定向
location重定向