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/*
* Copyright (C) 2013 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "core/html/parser/HTMLResourcePreloader.h"
#include "core/dom/Document.h"
#include "core/fetch/Resource.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/frame/Deprecation.h"
#include "core/frame/Settings.h"
#include "core/loader/DocumentLoader.h"
#include "core/loader/resource/CSSStyleSheetResource.h"
#include "platform/Histogram.h"
#include "public/platform/Platform.h"
#include <memory>
namespace blink {
HTMLResourcePreloader::HTMLResourcePreloader(Document& document)
: m_document(document) {}
HTMLResourcePreloader* HTMLResourcePreloader::create(Document& document) {
return new HTMLResourcePreloader(document);
}
DEFINE_TRACE(HTMLResourcePreloader) {
visitor->trace(m_document);
visitor->trace(m_cssPreloaders);
}
int HTMLResourcePreloader::countPreloads() {
if (m_document->loader())
return m_document->loader()->fetcher()->countPreloads();
return 0;
}
static void preconnectHost(PreloadRequest* request,
const NetworkHintsInterface& networkHintsInterface) {
ASSERT(request);
ASSERT(request->isPreconnect());
KURL host(request->baseURL(), request->resourceURL());
if (!host.isValid() || !host.protocolIsInHTTPFamily())
return;
networkHintsInterface.preconnectHost(host, request->crossOrigin());
}
void HTMLResourcePreloader::preload(
std::unique_ptr<PreloadRequest> preload,
const NetworkHintsInterface& networkHintsInterface) {
if (preload->isPreconnect()) {
preconnectHost(preload.get(), networkHintsInterface);
return;
}
// TODO(yoichio): Should preload if document is imported.
if (!m_document->loader())
return;
int duration = static_cast<int>(
1000 * (monotonicallyIncreasingTime() - preload->discoveryTime()));
DEFINE_STATIC_LOCAL(CustomCountHistogram, preloadDelayHistogram,
("WebCore.PreloadDelayMs", 0, 2000, 20));
preloadDelayHistogram.count(duration);
Resource* resource = preload->start(m_document);
if (resource && !resource->isLoaded() &&
preload->resourceType() == Resource::CSSStyleSheet) {
Settings* settings = m_document->settings();
if (settings && (settings->getCSSExternalScannerNoPreload() ||
settings->getCSSExternalScannerPreload()))
m_cssPreloaders.add(new CSSPreloaderResourceClient(resource, this));
}
}
} // namespace blink
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