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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/predictors/resource_prefetcher_manager.h"
#include "base/bind.h"
#include "base/stl_util.h"
#include "chrome/browser/predictors/resource_prefetch_predictor.h"
#include "content/public/browser/browser_thread.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_context_getter.h"
using content::BrowserThread;
namespace predictors {
ResourcePrefetcherManager::ResourcePrefetcherManager(
ResourcePrefetchPredictor* predictor,
const ResourcePrefetchPredictorConfig& config,
net::URLRequestContextGetter* context_getter)
: predictor_(predictor),
config_(config),
context_getter_(context_getter) {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
CHECK(predictor_);
CHECK(context_getter_);
}
ResourcePrefetcherManager::~ResourcePrefetcherManager() {
DCHECK(prefetcher_map_.empty())
<< "Did not call ShutdownOnUIThread or ShutdownOnIOThread. "
" Will leak Prefetcher pointers.";
}
void ResourcePrefetcherManager::ShutdownOnUIThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
predictor_ = NULL;
BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
base::Bind(&ResourcePrefetcherManager::ShutdownOnIOThread,
this));
}
void ResourcePrefetcherManager::ShutdownOnIOThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
STLDeleteContainerPairSecondPointers(prefetcher_map_.begin(),
prefetcher_map_.end());
}
void ResourcePrefetcherManager::MaybeAddPrefetch(
const NavigationID& navigation_id,
PrefetchKeyType key_type,
scoped_ptr<ResourcePrefetcher::RequestVector> requests) {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Don't add a duplicate prefetch for the same host or URL.
std::string key = key_type == PREFETCH_KEY_TYPE_HOST ?
navigation_id.main_frame_url.host() : navigation_id.main_frame_url.spec();
PrefetcherMap::iterator prefetcher_it = prefetcher_map_.find(key);
if (prefetcher_it != prefetcher_map_.end())
return;
ResourcePrefetcher* prefetcher = new ResourcePrefetcher(
this, config_, navigation_id, key_type, requests.Pass());
prefetcher_map_.insert(std::make_pair(key, prefetcher));
prefetcher->Start();
}
void ResourcePrefetcherManager::MaybeRemovePrefetch(
const NavigationID& navigation_id) {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// Look for a URL based prefetch first.
PrefetcherMap::iterator it = prefetcher_map_.find(
navigation_id.main_frame_url.spec());
if (it != prefetcher_map_.end() &&
it->second->navigation_id() == navigation_id) {
it->second->Stop();
return;
}
// No URL based prefetching, look for host based.
it = prefetcher_map_.find(navigation_id.main_frame_url.host());
if (it != prefetcher_map_.end() &&
it->second->navigation_id() == navigation_id) {
it->second->Stop();
}
}
void ResourcePrefetcherManager::ResourcePrefetcherFinished(
ResourcePrefetcher* resource_prefetcher,
ResourcePrefetcher::RequestVector* requests) {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
// |predictor_| can only be accessed from the UI thread.
scoped_ptr<ResourcePrefetcher::RequestVector> requests_ptr(requests);
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&ResourcePrefetcherManager::ResourcePrefetcherFinishedOnUI,
this,
resource_prefetcher->navigation_id(),
resource_prefetcher->key_type(),
base::Passed(&requests_ptr)));
const GURL& main_frame_url =
resource_prefetcher->navigation_id().main_frame_url;
const std::string key =
resource_prefetcher->key_type() == PREFETCH_KEY_TYPE_HOST ?
main_frame_url.host() : main_frame_url.spec();
PrefetcherMap::iterator it = prefetcher_map_.find(key);
DCHECK(it != prefetcher_map_.end());
delete it->second;
prefetcher_map_.erase(it);
}
void ResourcePrefetcherManager::ResourcePrefetcherFinishedOnUI(
const NavigationID& navigation_id,
PrefetchKeyType key_type,
scoped_ptr<ResourcePrefetcher::RequestVector> requests) {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
// |predictor_| may have been set to NULL if the predictor is shutting down.
if (predictor_)
predictor_->FinishedPrefetchForNavigation(navigation_id,
key_type,
requests.release());
}
net::URLRequestContext* ResourcePrefetcherManager::GetURLRequestContext() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
return context_getter_->GetURLRequestContext();
}
} // namespace predictors
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