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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_tracker.h"
#include "base/bind.h"
#include "base/logging.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/prerender/prerender_manager.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/resource_context.h"
#include "net/base/load_flags.h"
using content::BrowserThread;
using content::RenderViewHost;
namespace prerender {
namespace {
void DestroyPrerenderForRenderViewOnUI(
const base::WeakPtr<PrerenderManager>& prerender_manager_weak_ptr,
int render_process_id,
int render_view_id,
FinalStatus final_status) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
PrerenderManager* prerender_manager = prerender_manager_weak_ptr.get();
if (!prerender_manager)
return;
prerender_manager->DestroyPrerenderForRenderView(
render_process_id, render_view_id, final_status);
}
} // namespace
struct RenderViewInfo {
explicit RenderViewInfo(PrerenderManager* prerender_manager)
: final_status(FINAL_STATUS_MAX),
prerender_manager(prerender_manager->AsWeakPtr()) {
}
~RenderViewInfo() {}
FinalStatus final_status;
base::WeakPtr<PrerenderManager> prerender_manager;
};
PrerenderTracker::PrerenderTracker() {
}
PrerenderTracker::~PrerenderTracker() {
}
bool PrerenderTracker::TryUse(int child_id, int route_id) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
return SetFinalStatus(child_id, route_id, FINAL_STATUS_USED, NULL);
}
bool PrerenderTracker::TryCancel(
int child_id,
int route_id,
FinalStatus final_status) {
DCHECK_NE(FINAL_STATUS_USED, final_status);
DCHECK(final_status >= 0 && final_status < FINAL_STATUS_MAX);
FinalStatus actual_final_status;
SetFinalStatus(child_id, route_id, final_status, &actual_final_status);
return actual_final_status != FINAL_STATUS_USED &&
actual_final_status != FINAL_STATUS_MAX;
}
bool PrerenderTracker::TryCancelOnIOThread(
int child_id,
int route_id,
FinalStatus final_status) {
DCHECK_NE(FINAL_STATUS_USED, final_status);
DCHECK(final_status >= 0 && final_status < FINAL_STATUS_MAX);
if (!IsPrerenderingOnIOThread(child_id, route_id))
return false;
return TryCancel(child_id, route_id, final_status);
}
bool PrerenderTracker::GetFinalStatus(int child_id, int route_id,
FinalStatus* final_status) const {
ChildRouteIdPair child_route_id_pair(child_id, route_id);
base::AutoLock lock(final_status_map_lock_);
FinalStatusMap::const_iterator final_status_it =
final_status_map_.find(child_route_id_pair);
if (final_status_map_.end() == final_status_map_.find(child_route_id_pair))
return false;
*final_status = final_status_it->second.final_status;
return true;
}
void PrerenderTracker::OnPrerenderingStarted(
int child_id, int route_id, PrerenderManager* prerender_manager) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK_GE(child_id, 0);
DCHECK_GE(route_id, 0);
ChildRouteIdPair child_route_id_pair(child_id, route_id);
// The RenderView should not already be prerendering.
DCHECK(final_status_map_.end() ==
final_status_map_.find(child_route_id_pair));
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&AddPrerenderOnIOThreadTask, child_route_id_pair));
base::AutoLock lock(final_status_map_lock_);
final_status_map_.insert(
std::make_pair(child_route_id_pair, RenderViewInfo(prerender_manager)));
}
void PrerenderTracker::OnPrerenderingFinished(int child_id, int route_id) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
DCHECK_GE(child_id, 0);
DCHECK_GE(route_id, 0);
ChildRouteIdPair child_route_id_pair(child_id, route_id);
BrowserThread::PostTask(
BrowserThread::IO, FROM_HERE,
base::Bind(&RemovePrerenderOnIOThreadTask, child_route_id_pair));
base::AutoLock lock(final_status_map_lock_);
size_t num_erased = final_status_map_.erase(child_route_id_pair);
DCHECK_EQ(1u, num_erased);
}
bool PrerenderTracker::SetFinalStatus(int child_id, int route_id,
FinalStatus desired_final_status,
FinalStatus* actual_final_status) {
DCHECK(desired_final_status >= FINAL_STATUS_USED &&
desired_final_status < FINAL_STATUS_MAX);
ChildRouteIdPair child_route_id_pair(child_id, route_id);
base::AutoLock lock(final_status_map_lock_);
FinalStatusMap::iterator final_status_it =
final_status_map_.find(child_route_id_pair);
if (final_status_it == final_status_map_.end()) {
// The RenderView has already been either used or destroyed.
if (actual_final_status)
*actual_final_status = FINAL_STATUS_MAX;
return false;
}
if (final_status_it->second.final_status == FINAL_STATUS_MAX) {
final_status_it->second.final_status = desired_final_status;
if (desired_final_status != FINAL_STATUS_USED) {
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&DestroyPrerenderForRenderViewOnUI,
final_status_it->second.prerender_manager, child_id,
route_id, desired_final_status));
}
if (actual_final_status)
*actual_final_status = desired_final_status;
return true;
}
if (actual_final_status)
*actual_final_status = final_status_it->second.final_status;
return false;
}
bool PrerenderTracker::IsPrerenderingOnIOThread(int child_id,
int route_id) const {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
ChildRouteIdPair child_route_id_pair(child_id, route_id);
return possibly_prerendering_io_thread_set_.end() !=
possibly_prerendering_io_thread_set_.find(child_route_id_pair);
}
void PrerenderTracker::AddPrerenderOnIOThread(
const ChildRouteIdPair& child_route_id_pair) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
DCHECK(!IsPrerenderingOnIOThread(child_route_id_pair.first,
child_route_id_pair.second));
possibly_prerendering_io_thread_set_.insert(child_route_id_pair);
}
void PrerenderTracker::RemovePrerenderOnIOThread(
const ChildRouteIdPair& child_route_id_pair) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
DCHECK(IsPrerenderingOnIOThread(child_route_id_pair.first,
child_route_id_pair.second));
possibly_prerendering_io_thread_set_.erase(child_route_id_pair);
}
// static
PrerenderTracker* PrerenderTracker::GetDefault() {
return g_browser_process->prerender_tracker();
}
// static
void PrerenderTracker::AddPrerenderOnIOThreadTask(
const ChildRouteIdPair& child_route_id_pair) {
GetDefault()->AddPrerenderOnIOThread(child_route_id_pair);
}
// static
void PrerenderTracker::RemovePrerenderOnIOThreadTask(
const ChildRouteIdPair& child_route_id_pair) {
GetDefault()->RemovePrerenderOnIOThread(child_route_id_pair);
}
} // namespace prerender
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