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// Copyright (c) 2012 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_link_manager.h"
#include <limits>
#include <queue>
#include <utility>
#include "chrome/browser/prerender/prerender_contents.h"
#include "chrome/browser/prerender/prerender_manager.h"
#include "chrome/browser/prerender/prerender_manager_factory.h"
#include "chrome/browser/profiles/profile.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/session_storage_namespace.h"
#include "content/public/common/referrer.h"
#include "googleurl/src/gurl.h"
#include "googleurl/src/url_canon.h"
#include "ui/gfx/size.h"
using content::RenderViewHost;
using content::SessionStorageNamespace;
namespace prerender {
PrerenderLinkManager::PrerenderLinkManager(PrerenderManager* manager)
: manager_(manager) {
}
PrerenderLinkManager::~PrerenderLinkManager() {
}
bool PrerenderLinkManager::OnAddPrerender(int child_id,
int prerender_id,
const GURL& orig_url,
const content::Referrer& referrer,
const gfx::Size& size,
int render_view_route_id) {
DVLOG(2) << "OnAddPrerender, child_id = " << child_id
<< ", prerender_id = " << prerender_id
<< ", url = " << orig_url.spec();
DVLOG(3) << "... referrer url = " << referrer.url.spec()
<< ", size = (" << size.width() << ", " << size.height() << ")"
<< ", render_view_route_id = " << render_view_route_id;
// TODO(gavinp): Add tests to ensure fragments work, then remove this fragment
// clearing code.
url_canon::Replacements<char> replacements;
replacements.ClearRef();
const GURL url = orig_url.ReplaceComponents(replacements);
if (!manager_->AddPrerenderFromLinkRelPrerender(
child_id, render_view_route_id, url, referrer, size)) {
return false;
}
const ChildAndPrerenderIdPair child_and_prerender_id(child_id, prerender_id);
DCHECK_EQ(0U, ids_to_url_map_.count(child_and_prerender_id));
ids_to_url_map_.insert(std::make_pair(child_and_prerender_id, url));
return true;
}
// TODO(gavinp): Once an observer interface is provided down to the WebKit
// layer, we should add DCHECK_NE(0L, ids_to_url_map_.count(...)) to both
// OnCancelPrerender and OnAbandonPrerender. We can't do this now, since
// the WebKit layer isn't even aware if we didn't add the prerender to the map
// in OnAddPrerender above.
void PrerenderLinkManager::OnCancelPrerender(int child_id, int prerender_id) {
DVLOG(2) << "OnCancelPrerender, child_id = " << child_id
<< ", prerender_id = " << prerender_id;
const ChildAndPrerenderIdPair child_and_prerender_id(child_id, prerender_id);
IdPairToUrlMap::iterator id_url_iter =
ids_to_url_map_.find(child_and_prerender_id);
if (id_url_iter == ids_to_url_map_.end()) {
DVLOG(5) << "... canceling a prerender that doesn't exist.";
return;
}
const GURL url = id_url_iter->second;
ids_to_url_map_.erase(id_url_iter);
manager_->MaybeCancelPrerender(url);
}
void PrerenderLinkManager::OnAbandonPrerender(int child_id, int prerender_id) {
DVLOG(2) << "OnAbandonPrerender, child_id = " << child_id
<< ", prerender_id = " << prerender_id;
// TODO(gavinp,cbentzel): Implement reasonable behaviour for
// navigation away from launcher.
const ChildAndPrerenderIdPair child_and_prerender_id(child_id, prerender_id);
ids_to_url_map_.erase(child_and_prerender_id);
}
void PrerenderLinkManager::OnChannelClosing(int child_id) {
DVLOG(2) << "OnChannelClosing, child id = " << child_id;
const ChildAndPrerenderIdPair child_and_minimum_prerender_id(
child_id, std::numeric_limits<int>::min());
const ChildAndPrerenderIdPair child_and_maximum_prerender_id(
child_id, std::numeric_limits<int>::max());
std::queue<int> prerender_ids_to_abandon;
for (IdPairToUrlMap::iterator
i = ids_to_url_map_.lower_bound(child_and_minimum_prerender_id),
e = ids_to_url_map_.upper_bound(child_and_maximum_prerender_id);
i != e; ++i) {
prerender_ids_to_abandon.push(i->first.second);
}
while (!prerender_ids_to_abandon.empty()) {
DVLOG(4) << "---> abandon prerender_id = "
<< prerender_ids_to_abandon.front();
OnAbandonPrerender(child_id, prerender_ids_to_abandon.front());
prerender_ids_to_abandon.pop();
}
}
bool PrerenderLinkManager::IsEmpty() const {
return ids_to_url_map_.empty();
}
} // namespace prerender
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