bool PageCache::canCache(Page* page) const
{
if (!page)
return false;
#if PLATFORM(CHROMIUM) || !defined(NDEBUG)
logCanCachePageDecision(page);
#endif
// Cache the page, if possible.
// Don't write to the cache if in the middle of a redirect, since we will want to
// store the final page we end up on.
// No point writing to the cache on a reload or loadSame, since we will just write
// over it again when we leave that page.
FrameLoadType loadType = page->mainFrame()->loader()->loadType();
return m_capacity > 0
&& canCachePageContainingThisFrame(page->mainFrame())
&& page->backForward()->isActive()
&& page->settings()->usesPageCache()
#if ENABLE(DEVICE_ORIENTATION)
&& !DeviceMotionController::isActiveAt(page)
&& !DeviceOrientationController::isActiveAt(page)
#endif
#if ENABLE(PROXIMITY_EVENTS)
&& !DeviceProximityController::isActiveAt(page)
#endif
&& loadType != FrameLoadTypeReload
&& loadType != FrameLoadTypeReloadFromOrigin
&& loadType != FrameLoadTypeSame;
}
bool PageCache::canCache(Page* page) const
{
if (!page)
return false;
#if !defined(NDEBUG)
logCanCachePageDecision(page);
#endif
if (memoryPressureHandler().isUnderMemoryPressure())
return false;
// Cache the page, if possible.
// Don't write to the cache if in the middle of a redirect, since we will want to
// store the final page we end up on.
// No point writing to the cache on a reload or loadSame, since we will just write
// over it again when we leave that page.
FrameLoadType loadType = page->mainFrame().loader().loadType();
return m_capacity > 0
&& canCachePageContainingThisFrame(&page->mainFrame())
&& page->settings().usesPageCache()
#if ENABLE(DEVICE_ORIENTATION) && !PLATFORM(IOS)
&& !DeviceMotionController::isActiveAt(page)
&& !DeviceOrientationController::isActiveAt(page)
#endif
#if ENABLE(PROXIMITY_EVENTS)
&& !DeviceProximityController::isActiveAt(page)
#endif
&& (loadType == FrameLoadType::Standard
|| loadType == FrameLoadType::Back
|| loadType == FrameLoadType::Forward
|| loadType == FrameLoadType::IndexedBackForward);
}
bool PageCache::canCachePageContainingThisFrame(Frame* frame)
{
for (Frame* child = frame->tree()->firstChild(); child; child = child->tree()->nextSibling()) {
if (!canCachePageContainingThisFrame(child))
return false;
}
FrameLoader* frameLoader = frame->loader();
DocumentLoader* documentLoader = frameLoader->documentLoader();
Document* document = frame->document();
return documentLoader
&& documentLoader->mainDocumentError().isNull()
// Do not cache error pages (these can be recognized as pages with substitute data or unreachable URLs).
&& !(documentLoader->substituteData().isValid() && !documentLoader->substituteData().failingURL().isEmpty())
&& (!frameLoader->subframeLoader()->containsPlugins() || frame->page()->settings()->pageCacheSupportsPlugins())
&& (!document->url().protocolIs("https") || (!documentLoader->response().cacheControlContainsNoCache() && !documentLoader->response().cacheControlContainsNoStore()))
&& (!document->domWindow() || !document->domWindow()->hasEventListeners(eventNames().unloadEvent))
#if ENABLE(SQL_DATABASE)
&& !DatabaseManager::manager().hasOpenDatabases(document)
#endif
#if ENABLE(SHARED_WORKERS)
&& !SharedWorkerRepository::hasSharedWorkers(document)
#endif
&& frameLoader->history()->currentItem()
&& !frameLoader->quickRedirectComing()
&& !documentLoader->isLoadingInAPISense()
&& !documentLoader->isStopping()
&& document->canSuspendActiveDOMObjects()
// FIXME: We should investigating caching frames that have an associated
// application cache. <rdar://problem/5917899> tracks that work.
&& documentLoader->applicationCacheHost()->canCacheInPageCache()
&& frameLoader->client()->canCachePage();
}
bool PageCache::canCachePageContainingThisFrame(Frame& frame)
{
for (Frame* child = frame.tree().firstChild(); child; child = child->tree().nextSibling()) {
if (!canCachePageContainingThisFrame(*child))
return false;
}
FrameLoader& frameLoader = frame.loader();
DocumentLoader* documentLoader = frameLoader.documentLoader();
Document* document = frame.document();
return documentLoader
&& (documentLoader->mainDocumentError().isNull() || (documentLoader->mainDocumentError().isCancellation() && documentLoader->subresourceLoadersArePageCacheAcceptable()))
// Do not cache error pages (these can be recognized as pages with substitute data or unreachable URLs).
&& !(documentLoader->substituteData().isValid() && !documentLoader->substituteData().failingURL().isEmpty())
&& (!frameLoader.subframeLoader().containsPlugins() || frame.page()->settings().pageCacheSupportsPlugins())
&& !(frame.isMainFrame() && document->url().protocolIs("https") && documentLoader->response().cacheControlContainsNoStore())
&& frameLoader.history().currentItem()
&& !frameLoader.quickRedirectComing()
&& !documentLoader->isLoading()
&& !documentLoader->isStopping()
&& document->canSuspendActiveDOMObjectsForPageCache()
// FIXME: We should investigating caching frames that have an associated
// application cache. <rdar://problem/5917899> tracks that work.
&& documentLoader->applicationCacheHost()->canCacheInPageCache()
&& frameLoader.client().canCachePage();
}
