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// Copyright 2017 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 "components/ntp_snippets/remote/prefetched_pages_tracker_impl.h"
#include "base/bind.h"
#include "components/offline_pages/core/client_namespace_constants.h"
using offline_pages::OfflinePageItem;
using offline_pages::OfflinePageModel;
namespace ntp_snippets {
namespace {
bool IsOfflineItemPrefetchedPage(const OfflinePageItem& offline_page_item) {
return offline_page_item.client_id.name_space ==
offline_pages::kSuggestedArticlesNamespace;
}
const GURL& GetOfflinePageUrl(const OfflinePageItem& offline_page_item) {
return offline_page_item.original_url != GURL()
? offline_page_item.original_url
: offline_page_item.url;
}
} // namespace
PrefetchedPagesTrackerImpl::PrefetchedPagesTrackerImpl(
OfflinePageModel* offline_page_model)
: initialized_(false),
offline_page_model_(offline_page_model),
weak_ptr_factory_(this) {
DCHECK(offline_page_model_);
}
PrefetchedPagesTrackerImpl::~PrefetchedPagesTrackerImpl() {
offline_page_model_->RemoveObserver(this);
}
bool PrefetchedPagesTrackerImpl::IsInitialized() const {
return initialized_;
}
void PrefetchedPagesTrackerImpl::Initialize(
base::OnceCallback<void()> callback) {
if (IsInitialized()) {
std::move(callback).Run();
} else {
initialization_completed_callbacks_.push_back(std::move(callback));
// The call to get pages might be already in flight, started by previous
// calls to this method. In this case, there is at least one callback
// already waiting.
if (initialization_completed_callbacks_.size() == 1) {
offline_page_model_->GetPagesByNamespace(
offline_pages::kSuggestedArticlesNamespace,
base::BindOnce(&PrefetchedPagesTrackerImpl::OfflinePagesLoaded,
weak_ptr_factory_.GetWeakPtr()));
}
}
}
bool PrefetchedPagesTrackerImpl::PrefetchedOfflinePageExists(
const GURL& url) const {
DCHECK(initialized_);
DCHECK(prefetched_url_counts_.count(url) == 0 ||
prefetched_url_counts_.find(url)->second > 0);
// It is enough to check existence of an item (instead of its count), because
// the mapping does not contain zero counts.
return prefetched_url_counts_.count(url) == 1;
}
void PrefetchedPagesTrackerImpl::OfflinePageModelLoaded(
OfflinePageModel* model) {
// Ignored. Offline Page model delayes our requests until it is loaded.
}
void PrefetchedPagesTrackerImpl::OfflinePageAdded(
OfflinePageModel* model,
const OfflinePageItem& added_page) {
if (IsOfflineItemPrefetchedPage(added_page)) {
AddOfflinePage(added_page);
}
}
void PrefetchedPagesTrackerImpl::OfflinePageDeleted(
const offline_pages::OfflinePageModel::DeletedPageInfo& page_info) {
std::map<int64_t, GURL>::iterator offline_id_it =
offline_id_to_url_mapping_.find(page_info.offline_id);
if (offline_id_it == offline_id_to_url_mapping_.end()) {
// We did not know about this page, thus, nothing to delete.
return;
}
std::map<GURL, int>::iterator url_it =
prefetched_url_counts_.find(offline_id_it->second);
DCHECK(url_it != prefetched_url_counts_.end());
--url_it->second;
if (url_it->second == 0) {
prefetched_url_counts_.erase(url_it);
}
offline_id_to_url_mapping_.erase(offline_id_it);
}
void PrefetchedPagesTrackerImpl::OfflinePagesLoaded(
const std::vector<OfflinePageItem>& all_prefetched_offline_pages) {
for (const OfflinePageItem& item : all_prefetched_offline_pages) {
DCHECK(IsOfflineItemPrefetchedPage(item));
AddOfflinePage(item);
}
initialized_ = true;
offline_page_model_->AddObserver(this);
for (auto& callback : initialization_completed_callbacks_) {
std::move(callback).Run();
}
initialization_completed_callbacks_.clear();
}
void PrefetchedPagesTrackerImpl::AddOfflinePage(
const OfflinePageItem& offline_page_item) {
const GURL& url = GetOfflinePageUrl(offline_page_item);
DCHECK(prefetched_url_counts_.count(url) == 0 ||
prefetched_url_counts_.find(url)->second > 0);
++prefetched_url_counts_[url];
offline_id_to_url_mapping_[offline_page_item.offline_id] = url;
}
} // namespace ntp_snippets
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