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// Copyright (c) 2010 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_manager.h"
#include "base/logging.h"
#include "base/time.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/prerender/prerender_contents.h"
#include "chrome/browser/renderer_host/render_view_host.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/tab_contents/render_view_host_manager.h"
#include "chrome/common/render_messages.h"
struct PrerenderManager::PrerenderContentsData {
PrerenderContents* contents_;
base::Time start_time_;
GURL url_;
PrerenderContentsData(PrerenderContents* contents,
base::Time start_time,
GURL url)
: contents_(contents),
start_time_(start_time),
url_(url) {
}
};
PrerenderManager::PrerenderManager(Profile* profile)
: profile_(profile),
max_prerender_age_(base::TimeDelta::FromSeconds(
kDefaultMaxPrerenderAgeSeconds)),
max_elements_(kDefaultMaxPrerenderElements) {
}
PrerenderManager::~PrerenderManager() {
while (prerender_list_.size() > 0) {
PrerenderContentsData data = prerender_list_.front();
prerender_list_.pop_front();
delete data.contents_;
}
}
void PrerenderManager::AddPreload(const GURL& url,
const std::vector<GURL>& alias_urls) {
DCHECK(CalledOnValidThread());
DeleteOldEntries();
// If the URL already exists in the set of preloaded URLs, don't do anything.
for (std::list<PrerenderContentsData>::iterator it = prerender_list_.begin();
it != prerender_list_.end();
++it) {
if (it->url_ == url)
return;
}
PrerenderContentsData data(CreatePrerenderContents(url, alias_urls),
GetCurrentTime(), url);
prerender_list_.push_back(data);
data.contents_->StartPrerendering();
while (prerender_list_.size() > max_elements_) {
data = prerender_list_.front();
prerender_list_.pop_front();
delete data.contents_;
}
}
void PrerenderManager::DeleteOldEntries() {
while (prerender_list_.size() > 0) {
PrerenderContentsData data = prerender_list_.front();
if (IsPrerenderElementFresh(data.start_time_))
return;
prerender_list_.pop_front();
delete data.contents_;
}
}
PrerenderContents* PrerenderManager::GetEntry(const GURL& url) {
DeleteOldEntries();
for (std::list<PrerenderContentsData>::iterator it = prerender_list_.begin();
it != prerender_list_.end();
++it) {
PrerenderContents* pc = it->contents_;
if (pc->MatchesURL(url)) {
PrerenderContents* pc = it->contents_;
prerender_list_.erase(it);
return pc;
}
}
// Entry not found.
return NULL;
}
bool PrerenderManager::MaybeUsePreloadedPage(TabContents* tc, const GURL& url) {
DCHECK(CalledOnValidThread());
scoped_ptr<PrerenderContents> pc(GetEntry(url));
if (pc.get() == NULL)
return false;
RenderViewHost* rvh = pc->render_view_host();
pc->set_render_view_host(NULL);
rvh->Send(new ViewMsg_DisplayPrerenderedPage(rvh->routing_id()));
tc->SwapInRenderViewHost(rvh);
ViewHostMsg_FrameNavigate_Params* p = pc->navigate_params();
if (p != NULL)
tc->DidNavigate(rvh, *p);
string16 title = pc->title();
if (!title.empty())
tc->UpdateTitle(rvh, pc->page_id(), UTF16ToWideHack(title));
return true;
}
void PrerenderManager::RemoveEntry(PrerenderContents* entry) {
DCHECK(CalledOnValidThread());
for (std::list<PrerenderContentsData>::iterator it = prerender_list_.begin();
it != prerender_list_.end();
++it) {
if (it->contents_ == entry) {
prerender_list_.erase(it);
break;
}
}
delete entry;
DeleteOldEntries();
}
base::Time PrerenderManager::GetCurrentTime() const {
return base::Time::Now();
}
bool PrerenderManager::IsPrerenderElementFresh(const base::Time start) const {
base::Time now = GetCurrentTime();
return (now - start < max_prerender_age_);
}
PrerenderContents* PrerenderManager::CreatePrerenderContents(
const GURL& url,
const std::vector<GURL>& alias_urls) {
return new PrerenderContents(this, profile_, url, alias_urls);
}
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