mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-08 20:47:44 +00:00
848 lines
24 KiB
C++
848 lines
24 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsPrefetchService.h"
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#include "nsICacheEntry.h"
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#include "nsIServiceManager.h"
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#include "nsICategoryManager.h"
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#include "nsIObserverService.h"
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#include "nsIWebProgress.h"
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#include "nsCURILoader.h"
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#include "nsICacheInfoChannel.h"
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#include "nsIHttpChannel.h"
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#include "nsIURL.h"
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#include "nsISimpleEnumerator.h"
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#include "nsNetUtil.h"
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#include "nsString.h"
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#include "nsXPIDLString.h"
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#include "nsReadableUtils.h"
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#include "nsStreamUtils.h"
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#include "nsAutoPtr.h"
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#include "prtime.h"
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#include "prlog.h"
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#include "plstr.h"
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#include "nsIAsyncVerifyRedirectCallback.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Attributes.h"
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#include "nsIDOMNode.h"
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#include "nsINode.h"
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#include "nsIDocument.h"
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#include "nsContentUtils.h"
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using namespace mozilla;
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//
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// To enable logging (see prlog.h for full details):
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//
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// set NSPR_LOG_MODULES=nsPrefetch:5
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// set NSPR_LOG_FILE=prefetch.log
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//
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// this enables PR_LOG_ALWAYS level information and places all output in
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// the file http.log
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//
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static PRLogModuleInfo *gPrefetchLog;
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#undef LOG
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#define LOG(args) PR_LOG(gPrefetchLog, 4, args)
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#undef LOG_ENABLED
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#define LOG_ENABLED() PR_LOG_TEST(gPrefetchLog, 4)
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#define PREFETCH_PREF "network.prefetch-next"
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//-----------------------------------------------------------------------------
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// helpers
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//-----------------------------------------------------------------------------
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static inline uint32_t
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PRTimeToSeconds(PRTime t_usec)
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{
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PRTime usec_per_sec = PR_USEC_PER_SEC;
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return uint32_t(t_usec /= usec_per_sec);
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}
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#define NowInSeconds() PRTimeToSeconds(PR_Now())
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//-----------------------------------------------------------------------------
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// nsPrefetchQueueEnumerator
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//-----------------------------------------------------------------------------
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class nsPrefetchQueueEnumerator final : public nsISimpleEnumerator
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSISIMPLEENUMERATOR
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explicit nsPrefetchQueueEnumerator(nsPrefetchService *aService);
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private:
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~nsPrefetchQueueEnumerator();
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void Increment();
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nsRefPtr<nsPrefetchService> mService;
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nsRefPtr<nsPrefetchNode> mCurrent;
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bool mStarted;
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};
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//-----------------------------------------------------------------------------
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// nsPrefetchQueueEnumerator <public>
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//-----------------------------------------------------------------------------
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nsPrefetchQueueEnumerator::nsPrefetchQueueEnumerator(nsPrefetchService *aService)
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: mService(aService)
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, mStarted(false)
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{
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Increment();
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}
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nsPrefetchQueueEnumerator::~nsPrefetchQueueEnumerator()
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{
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchQueueEnumerator::nsISimpleEnumerator
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP
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nsPrefetchQueueEnumerator::HasMoreElements(bool *aHasMore)
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{
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*aHasMore = (mCurrent != nullptr);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPrefetchQueueEnumerator::GetNext(nsISupports **aItem)
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{
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if (!mCurrent) return NS_ERROR_FAILURE;
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NS_ADDREF(*aItem = static_cast<nsIStreamListener*>(mCurrent.get()));
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Increment();
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchQueueEnumerator <private>
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//-----------------------------------------------------------------------------
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void
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nsPrefetchQueueEnumerator::Increment()
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{
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if (!mStarted) {
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// If the service is currently serving a request, it won't be in
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// the pending queue, so we return it first. If it isn't, we'll
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// just start with the pending queue.
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mStarted = true;
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mCurrent = mService->GetCurrentNode();
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if (!mCurrent)
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mCurrent = mService->GetQueueHead();
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return;
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}
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if (mCurrent) {
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if (mCurrent == mService->GetCurrentNode()) {
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// If we just returned the node being processed by the service,
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// start with the pending queue
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mCurrent = mService->GetQueueHead();
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}
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else {
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// Otherwise just advance to the next item in the queue
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mCurrent = mCurrent->mNext;
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}
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}
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchQueueEnumerator::nsISupports
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//-----------------------------------------------------------------------------
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NS_IMPL_ISUPPORTS(nsPrefetchQueueEnumerator, nsISimpleEnumerator)
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//-----------------------------------------------------------------------------
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// nsPrefetchNode <public>
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//-----------------------------------------------------------------------------
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nsPrefetchNode::nsPrefetchNode(nsPrefetchService *aService,
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nsIURI *aURI,
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nsIURI *aReferrerURI,
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nsIDOMNode *aSource)
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: mNext(nullptr)
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, mURI(aURI)
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, mReferrerURI(aReferrerURI)
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, mService(aService)
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, mChannel(nullptr)
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, mBytesRead(0)
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{
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mSource = do_GetWeakReference(aSource);
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}
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nsresult
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nsPrefetchNode::OpenChannel()
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{
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nsCOMPtr<nsINode> source = do_QueryReferent(mSource);
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if (!source) {
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// Don't attempt to prefetch if we don't have a source node
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// (which should never happen).
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return NS_ERROR_FAILURE;
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}
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nsCOMPtr<nsILoadGroup> loadGroup = source->OwnerDoc()->GetDocumentLoadGroup();
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nsresult rv = NS_NewChannel(getter_AddRefs(mChannel),
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mURI,
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nsContentUtils::GetSystemPrincipal(),
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nsILoadInfo::SEC_NORMAL,
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nsIContentPolicy::TYPE_OTHER,
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loadGroup, // aLoadGroup
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this, // aCallbacks
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nsIRequest::LOAD_BACKGROUND |
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nsICachingChannel::LOAD_ONLY_IF_MODIFIED);
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NS_ENSURE_SUCCESS(rv, rv);
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// configure HTTP specific stuff
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nsCOMPtr<nsIHttpChannel> httpChannel =
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do_QueryInterface(mChannel);
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if (httpChannel) {
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httpChannel->SetReferrer(mReferrerURI);
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httpChannel->SetRequestHeader(
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NS_LITERAL_CSTRING("X-Moz"),
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NS_LITERAL_CSTRING("prefetch"),
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false);
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}
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rv = mChannel->AsyncOpen(this, nullptr);
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NS_ENSURE_SUCCESS(rv, rv);
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return NS_OK;
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}
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nsresult
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nsPrefetchNode::CancelChannel(nsresult error)
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{
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mChannel->Cancel(error);
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mChannel = nullptr;
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchNode::nsISupports
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//-----------------------------------------------------------------------------
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NS_IMPL_ISUPPORTS(nsPrefetchNode,
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nsIRequestObserver,
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nsIStreamListener,
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nsIInterfaceRequestor,
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nsIChannelEventSink,
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nsIRedirectResultListener)
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//-----------------------------------------------------------------------------
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// nsPrefetchNode::nsIStreamListener
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP
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nsPrefetchNode::OnStartRequest(nsIRequest *aRequest,
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nsISupports *aContext)
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{
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nsresult rv;
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nsCOMPtr<nsICacheInfoChannel> cacheInfoChannel =
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do_QueryInterface(aRequest, &rv);
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if (NS_FAILED(rv)) return rv;
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// no need to prefetch a document that is already in the cache
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bool fromCache;
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if (NS_SUCCEEDED(cacheInfoChannel->IsFromCache(&fromCache)) &&
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fromCache) {
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LOG(("document is already in the cache; canceling prefetch\n"));
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return NS_BINDING_ABORTED;
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}
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//
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// no need to prefetch a document that must be requested fresh each
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// and every time.
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//
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uint32_t expTime;
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if (NS_SUCCEEDED(cacheInfoChannel->GetCacheTokenExpirationTime(&expTime))) {
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if (NowInSeconds() >= expTime) {
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LOG(("document cannot be reused from cache; "
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"canceling prefetch\n"));
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return NS_BINDING_ABORTED;
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPrefetchNode::OnDataAvailable(nsIRequest *aRequest,
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nsISupports *aContext,
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nsIInputStream *aStream,
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uint64_t aOffset,
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uint32_t aCount)
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{
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uint32_t bytesRead = 0;
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aStream->ReadSegments(NS_DiscardSegment, nullptr, aCount, &bytesRead);
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mBytesRead += bytesRead;
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LOG(("prefetched %u bytes [offset=%llu]\n", bytesRead, aOffset));
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return NS_OK;
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}
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NS_IMETHODIMP
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nsPrefetchNode::OnStopRequest(nsIRequest *aRequest,
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nsISupports *aContext,
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nsresult aStatus)
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{
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LOG(("done prefetching [status=%x]\n", aStatus));
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if (mBytesRead == 0 && aStatus == NS_OK) {
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// we didn't need to read (because LOAD_ONLY_IF_MODIFIED was
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// specified), but the object should report loadedSize as if it
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// did.
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mChannel->GetContentLength(&mBytesRead);
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}
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mService->NotifyLoadCompleted(this);
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mService->ProcessNextURI();
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchNode::nsIInterfaceRequestor
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP
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nsPrefetchNode::GetInterface(const nsIID &aIID, void **aResult)
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{
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if (aIID.Equals(NS_GET_IID(nsIChannelEventSink))) {
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NS_ADDREF_THIS();
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*aResult = static_cast<nsIChannelEventSink *>(this);
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return NS_OK;
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}
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if (aIID.Equals(NS_GET_IID(nsIRedirectResultListener))) {
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NS_ADDREF_THIS();
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*aResult = static_cast<nsIRedirectResultListener *>(this);
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return NS_OK;
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}
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return NS_ERROR_NO_INTERFACE;
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchNode::nsIChannelEventSink
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP
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nsPrefetchNode::AsyncOnChannelRedirect(nsIChannel *aOldChannel,
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nsIChannel *aNewChannel,
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uint32_t aFlags,
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nsIAsyncVerifyRedirectCallback *callback)
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{
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nsCOMPtr<nsIURI> newURI;
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nsresult rv = aNewChannel->GetURI(getter_AddRefs(newURI));
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if (NS_FAILED(rv))
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return rv;
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bool match;
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rv = newURI->SchemeIs("http", &match);
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if (NS_FAILED(rv) || !match) {
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rv = newURI->SchemeIs("https", &match);
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if (NS_FAILED(rv) || !match) {
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LOG(("rejected: URL is not of type http/https\n"));
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return NS_ERROR_ABORT;
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}
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}
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// HTTP request headers are not automatically forwarded to the new channel.
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nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(aNewChannel);
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NS_ENSURE_STATE(httpChannel);
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httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("X-Moz"),
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NS_LITERAL_CSTRING("prefetch"),
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false);
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// Assign to mChannel after we get notification about success of the
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// redirect in OnRedirectResult.
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mRedirectChannel = aNewChannel;
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callback->OnRedirectVerifyCallback(NS_OK);
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchNode::nsIRedirectResultListener
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//-----------------------------------------------------------------------------
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NS_IMETHODIMP
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nsPrefetchNode::OnRedirectResult(bool proceeding)
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{
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if (proceeding && mRedirectChannel)
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mChannel = mRedirectChannel;
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mRedirectChannel = nullptr;
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return NS_OK;
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchService <public>
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//-----------------------------------------------------------------------------
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nsPrefetchService::nsPrefetchService()
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: mQueueHead(nullptr)
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, mQueueTail(nullptr)
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, mStopCount(0)
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, mHaveProcessed(false)
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, mDisabled(true)
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{
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}
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nsPrefetchService::~nsPrefetchService()
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{
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Preferences::RemoveObserver(this, PREFETCH_PREF);
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// cannot reach destructor if prefetch in progress (listener owns reference
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// to this service)
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EmptyQueue();
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}
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nsresult
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nsPrefetchService::Init()
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{
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if (!gPrefetchLog)
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gPrefetchLog = PR_NewLogModule("nsPrefetch");
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nsresult rv;
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// read prefs and hook up pref observer
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mDisabled = !Preferences::GetBool(PREFETCH_PREF, !mDisabled);
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Preferences::AddWeakObserver(this, PREFETCH_PREF);
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// Observe xpcom-shutdown event
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nsCOMPtr<nsIObserverService> observerService =
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mozilla::services::GetObserverService();
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if (!observerService)
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return NS_ERROR_FAILURE;
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rv = observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
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NS_ENSURE_SUCCESS(rv, rv);
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if (!mDisabled)
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AddProgressListener();
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return NS_OK;
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}
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void
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nsPrefetchService::ProcessNextURI()
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{
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nsresult rv;
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nsCOMPtr<nsIURI> uri, referrer;
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mCurrentNode = nullptr;
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do {
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rv = DequeueNode(getter_AddRefs(mCurrentNode));
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if (NS_FAILED(rv)) break;
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if (LOG_ENABLED()) {
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nsAutoCString spec;
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mCurrentNode->mURI->GetSpec(spec);
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LOG(("ProcessNextURI [%s]\n", spec.get()));
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}
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//
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// if opening the channel fails, then just skip to the next uri
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//
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nsRefPtr<nsPrefetchNode> node = mCurrentNode;
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rv = node->OpenChannel();
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}
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while (NS_FAILED(rv));
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}
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void
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nsPrefetchService::NotifyLoadRequested(nsPrefetchNode *node)
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{
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nsCOMPtr<nsIObserverService> observerService =
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mozilla::services::GetObserverService();
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if (!observerService)
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return;
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observerService->NotifyObservers(static_cast<nsIStreamListener*>(node),
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"prefetch-load-requested", nullptr);
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}
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void
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nsPrefetchService::NotifyLoadCompleted(nsPrefetchNode *node)
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{
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nsCOMPtr<nsIObserverService> observerService =
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mozilla::services::GetObserverService();
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if (!observerService)
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return;
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observerService->NotifyObservers(static_cast<nsIStreamListener*>(node),
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"prefetch-load-completed", nullptr);
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}
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//-----------------------------------------------------------------------------
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// nsPrefetchService <private>
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//-----------------------------------------------------------------------------
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void
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nsPrefetchService::AddProgressListener()
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{
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// Register as an observer for the document loader
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nsCOMPtr<nsIWebProgress> progress =
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do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
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if (progress)
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progress->AddProgressListener(this, nsIWebProgress::NOTIFY_STATE_DOCUMENT);
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}
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void
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nsPrefetchService::RemoveProgressListener()
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{
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// Register as an observer for the document loader
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nsCOMPtr<nsIWebProgress> progress =
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do_GetService(NS_DOCUMENTLOADER_SERVICE_CONTRACTID);
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if (progress)
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progress->RemoveProgressListener(this);
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}
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nsresult
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nsPrefetchService::EnqueueNode(nsPrefetchNode *aNode)
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{
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NS_ADDREF(aNode);
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if (!mQueueTail) {
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mQueueHead = aNode;
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mQueueTail = aNode;
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}
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else {
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mQueueTail->mNext = aNode;
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mQueueTail = aNode;
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}
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return NS_OK;
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}
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nsresult
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nsPrefetchService::EnqueueURI(nsIURI *aURI,
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nsIURI *aReferrerURI,
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nsIDOMNode *aSource,
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nsPrefetchNode **aNode)
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{
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nsPrefetchNode *node = new nsPrefetchNode(this, aURI, aReferrerURI,
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aSource);
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if (!node)
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return NS_ERROR_OUT_OF_MEMORY;
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NS_ADDREF(*aNode = node);
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return EnqueueNode(node);
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}
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nsresult
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nsPrefetchService::DequeueNode(nsPrefetchNode **node)
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{
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if (!mQueueHead)
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return NS_ERROR_NOT_AVAILABLE;
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// give the ref to the caller
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*node = mQueueHead;
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mQueueHead = mQueueHead->mNext;
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(*node)->mNext = nullptr;
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if (!mQueueHead)
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mQueueTail = nullptr;
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return NS_OK;
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}
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|
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void
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nsPrefetchService::EmptyQueue()
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{
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do {
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nsRefPtr<nsPrefetchNode> node;
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DequeueNode(getter_AddRefs(node));
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} while (mQueueHead);
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}
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void
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nsPrefetchService::StartPrefetching()
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|
{
|
|
//
|
|
// at initialization time we might miss the first DOCUMENT START
|
|
// notification, so we have to be careful to avoid letting our
|
|
// stop count go negative.
|
|
//
|
|
if (mStopCount > 0)
|
|
mStopCount--;
|
|
|
|
LOG(("StartPrefetching [stopcount=%d]\n", mStopCount));
|
|
|
|
// only start prefetching after we've received enough DOCUMENT
|
|
// STOP notifications. we do this inorder to defer prefetching
|
|
// until after all sub-frames have finished loading.
|
|
if (mStopCount == 0 && !mCurrentNode) {
|
|
mHaveProcessed = true;
|
|
ProcessNextURI();
|
|
}
|
|
}
|
|
|
|
void
|
|
nsPrefetchService::StopPrefetching()
|
|
{
|
|
mStopCount++;
|
|
|
|
LOG(("StopPrefetching [stopcount=%d]\n", mStopCount));
|
|
|
|
// only kill the prefetch queue if we've actually started prefetching.
|
|
if (!mCurrentNode)
|
|
return;
|
|
|
|
mCurrentNode->CancelChannel(NS_BINDING_ABORTED);
|
|
mCurrentNode = nullptr;
|
|
EmptyQueue();
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// nsPrefetchService::nsISupports
|
|
//-----------------------------------------------------------------------------
|
|
|
|
NS_IMPL_ISUPPORTS(nsPrefetchService,
|
|
nsIPrefetchService,
|
|
nsIWebProgressListener,
|
|
nsIObserver,
|
|
nsISupportsWeakReference)
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// nsPrefetchService::nsIPrefetchService
|
|
//-----------------------------------------------------------------------------
|
|
|
|
nsresult
|
|
nsPrefetchService::Prefetch(nsIURI *aURI,
|
|
nsIURI *aReferrerURI,
|
|
nsIDOMNode *aSource,
|
|
bool aExplicit)
|
|
{
|
|
nsresult rv;
|
|
|
|
NS_ENSURE_ARG_POINTER(aURI);
|
|
NS_ENSURE_ARG_POINTER(aReferrerURI);
|
|
|
|
if (LOG_ENABLED()) {
|
|
nsAutoCString spec;
|
|
aURI->GetSpec(spec);
|
|
LOG(("PrefetchURI [%s]\n", spec.get()));
|
|
}
|
|
|
|
if (mDisabled) {
|
|
LOG(("rejected: prefetch service is disabled\n"));
|
|
return NS_ERROR_ABORT;
|
|
}
|
|
|
|
//
|
|
// XXX we should really be asking the protocol handler if it supports
|
|
// caching, so we can determine if there is any value to prefetching.
|
|
// for now, we'll only prefetch http links since we know that's the
|
|
// most common case. ignore https links since https content only goes
|
|
// into the memory cache.
|
|
//
|
|
// XXX we might want to either leverage nsIProtocolHandler::protocolFlags
|
|
// or possibly nsIRequest::loadFlags to determine if this URI should be
|
|
// prefetched.
|
|
//
|
|
bool match;
|
|
rv = aURI->SchemeIs("http", &match);
|
|
if (NS_FAILED(rv) || !match) {
|
|
rv = aURI->SchemeIs("https", &match);
|
|
if (NS_FAILED(rv) || !match) {
|
|
LOG(("rejected: URL is not of type http/https\n"));
|
|
return NS_ERROR_ABORT;
|
|
}
|
|
}
|
|
|
|
//
|
|
// the referrer URI must be http:
|
|
//
|
|
rv = aReferrerURI->SchemeIs("http", &match);
|
|
if (NS_FAILED(rv) || !match) {
|
|
rv = aReferrerURI->SchemeIs("https", &match);
|
|
if (NS_FAILED(rv) || !match) {
|
|
LOG(("rejected: referrer URL is neither http nor https\n"));
|
|
return NS_ERROR_ABORT;
|
|
}
|
|
}
|
|
|
|
// skip URLs that contain query strings, except URLs for which prefetching
|
|
// has been explicitly requested.
|
|
if (!aExplicit) {
|
|
nsCOMPtr<nsIURL> url(do_QueryInterface(aURI, &rv));
|
|
if (NS_FAILED(rv)) return rv;
|
|
nsAutoCString query;
|
|
rv = url->GetQuery(query);
|
|
if (NS_FAILED(rv) || !query.IsEmpty()) {
|
|
LOG(("rejected: URL has a query string\n"));
|
|
return NS_ERROR_ABORT;
|
|
}
|
|
}
|
|
|
|
//
|
|
// cancel if being prefetched
|
|
//
|
|
if (mCurrentNode) {
|
|
bool equals;
|
|
if (NS_SUCCEEDED(mCurrentNode->mURI->Equals(aURI, &equals)) && equals) {
|
|
LOG(("rejected: URL is already being prefetched\n"));
|
|
return NS_ERROR_ABORT;
|
|
}
|
|
}
|
|
|
|
//
|
|
// cancel if already on the prefetch queue
|
|
//
|
|
nsPrefetchNode *node = mQueueHead;
|
|
for (; node; node = node->mNext) {
|
|
bool equals;
|
|
if (NS_SUCCEEDED(node->mURI->Equals(aURI, &equals)) && equals) {
|
|
LOG(("rejected: URL is already on prefetch queue\n"));
|
|
return NS_ERROR_ABORT;
|
|
}
|
|
}
|
|
|
|
nsRefPtr<nsPrefetchNode> enqueuedNode;
|
|
rv = EnqueueURI(aURI, aReferrerURI, aSource,
|
|
getter_AddRefs(enqueuedNode));
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
NotifyLoadRequested(enqueuedNode);
|
|
|
|
// if there are no pages loading, kick off the request immediately
|
|
if (mStopCount == 0 && mHaveProcessed)
|
|
ProcessNextURI();
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::PrefetchURI(nsIURI *aURI,
|
|
nsIURI *aReferrerURI,
|
|
nsIDOMNode *aSource,
|
|
bool aExplicit)
|
|
{
|
|
return Prefetch(aURI, aReferrerURI, aSource, aExplicit);
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::EnumerateQueue(nsISimpleEnumerator **aEnumerator)
|
|
{
|
|
*aEnumerator = new nsPrefetchQueueEnumerator(this);
|
|
if (!*aEnumerator) return NS_ERROR_OUT_OF_MEMORY;
|
|
|
|
NS_ADDREF(*aEnumerator);
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// nsPrefetchService::nsIWebProgressListener
|
|
//-----------------------------------------------------------------------------
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::OnProgressChange(nsIWebProgress *aProgress,
|
|
nsIRequest *aRequest,
|
|
int32_t curSelfProgress,
|
|
int32_t maxSelfProgress,
|
|
int32_t curTotalProgress,
|
|
int32_t maxTotalProgress)
|
|
{
|
|
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::OnStateChange(nsIWebProgress* aWebProgress,
|
|
nsIRequest *aRequest,
|
|
uint32_t progressStateFlags,
|
|
nsresult aStatus)
|
|
{
|
|
if (progressStateFlags & STATE_IS_DOCUMENT) {
|
|
if (progressStateFlags & STATE_STOP)
|
|
StartPrefetching();
|
|
else if (progressStateFlags & STATE_START)
|
|
StopPrefetching();
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::OnLocationChange(nsIWebProgress* aWebProgress,
|
|
nsIRequest* aRequest,
|
|
nsIURI *location,
|
|
uint32_t aFlags)
|
|
{
|
|
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::OnStatusChange(nsIWebProgress* aWebProgress,
|
|
nsIRequest* aRequest,
|
|
nsresult aStatus,
|
|
const char16_t* aMessage)
|
|
{
|
|
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
|
|
return NS_OK;
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::OnSecurityChange(nsIWebProgress *aWebProgress,
|
|
nsIRequest *aRequest,
|
|
uint32_t state)
|
|
{
|
|
NS_NOTREACHED("notification excluded in AddProgressListener(...)");
|
|
return NS_OK;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// nsPrefetchService::nsIObserver
|
|
//-----------------------------------------------------------------------------
|
|
|
|
NS_IMETHODIMP
|
|
nsPrefetchService::Observe(nsISupports *aSubject,
|
|
const char *aTopic,
|
|
const char16_t *aData)
|
|
{
|
|
LOG(("nsPrefetchService::Observe [topic=%s]\n", aTopic));
|
|
|
|
if (!strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
|
|
StopPrefetching();
|
|
EmptyQueue();
|
|
mDisabled = true;
|
|
}
|
|
else if (!strcmp(aTopic, NS_PREFBRANCH_PREFCHANGE_TOPIC_ID)) {
|
|
if (Preferences::GetBool(PREFETCH_PREF, false)) {
|
|
if (mDisabled) {
|
|
LOG(("enabling prefetching\n"));
|
|
mDisabled = false;
|
|
AddProgressListener();
|
|
}
|
|
}
|
|
else {
|
|
if (!mDisabled) {
|
|
LOG(("disabling prefetching\n"));
|
|
StopPrefetching();
|
|
EmptyQueue();
|
|
mDisabled = true;
|
|
RemoveProgressListener();
|
|
}
|
|
}
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
// vim: ts=4 sw=4 expandtab
|