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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/prerender/prerender_observer.h"
#include "base/time.h"
#include "chrome/browser/prerender/prerender_manager.h"
#include "chrome/browser/profiles/profile.h"
#include "content/browser/tab_contents/tab_contents.h"
#include "content/common/view_messages.h"
namespace prerender {
PrerenderObserver::PrerenderObserver(TabContents* tab_contents)
: TabContentsObserver(tab_contents),
pplt_load_start_() {
}
PrerenderObserver::~PrerenderObserver() {
}
void PrerenderObserver::ProvisionalChangeToMainFrameUrl(const GURL& url,
bool has_opener_set) {
PrerenderManager* prerender_manager = MaybeGetPrerenderManager();
if (!prerender_manager)
return;
if (prerender_manager->IsTabContentsPrerendering(tab_contents()))
return;
prerender_manager->MarkTabContentsAsNotPrerendered(tab_contents());
MaybeUsePreloadedPage(url, has_opener_set);
prerender_manager->RecordNavigation(url);
}
bool PrerenderObserver::OnMessageReceived(const IPC::Message& message) {
IPC_BEGIN_MESSAGE_MAP(PrerenderObserver, message)
IPC_MESSAGE_HANDLER(ViewHostMsg_DidStartProvisionalLoadForFrame,
OnDidStartProvisionalLoadForFrame)
IPC_END_MESSAGE_MAP()
return false;
}
void PrerenderObserver::OnDidStartProvisionalLoadForFrame(int64 frame_id,
bool is_main_frame,
bool has_opener_set,
const GURL& url) {
if (is_main_frame) {
// Record the beginning of a new PPLT navigation.
pplt_load_start_ = base::TimeTicks::Now();
}
}
void PrerenderObserver::DidStopLoading() {
// Don't include prerendered pages in the PPLT metric until after they are
// swapped in.
// Compute the PPLT metric and report it in a histogram, if needed.
if (!pplt_load_start_.is_null() && !IsPrerendering()) {
PrerenderManager::RecordPerceivedPageLoadTime(
base::TimeTicks::Now() - pplt_load_start_, tab_contents());
}
// Reset the PPLT metric.
pplt_load_start_ = base::TimeTicks();
}
PrerenderManager* PrerenderObserver::MaybeGetPrerenderManager() {
return tab_contents()->profile()->GetPrerenderManager();
}
bool PrerenderObserver::MaybeUsePreloadedPage(const GURL& url,
bool has_opener_set) {
PrerenderManager* prerender_manager = MaybeGetPrerenderManager();
if (!prerender_manager)
return false;
DCHECK(!prerender_manager->IsTabContentsPrerendering(tab_contents()));
return prerender_manager->MaybeUsePreloadedPage(tab_contents(),
url,
has_opener_set);
}
bool PrerenderObserver::IsPrerendering() {
PrerenderManager* prerender_manager = MaybeGetPrerenderManager();
if (!prerender_manager)
return false;
return prerender_manager->IsTabContentsPrerendering(tab_contents());
}
void PrerenderObserver::PrerenderSwappedIn() {
// Ensure we are not prerendering any more.
DCHECK(!IsPrerendering());
if (pplt_load_start_.is_null()) {
// If we have already finished loading, report a 0 PPLT.
PrerenderManager::RecordPerceivedPageLoadTime(base::TimeDelta(),
tab_contents());
} else {
// If we have not finished loading yet, rebase the start time to now.
pplt_load_start_ = base::TimeTicks::Now();
}
}
} // namespace prerender
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