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// Copyright 2016 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/reading_list/core/reading_list_model.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
ReadingListModel::ReadingListModel() : current_batch_updates_count_(0) {}
ReadingListModel::~ReadingListModel() {
for (auto& observer : observers_) {
observer.ReadingListModelBeingDeleted(this);
}
}
// Observer methods.
void ReadingListModel::AddObserver(ReadingListModelObserver* observer) {
DCHECK(CalledOnValidThread());
DCHECK(observer);
observers_.AddObserver(observer);
if (loaded()) {
observer->ReadingListModelLoaded(this);
}
}
void ReadingListModel::RemoveObserver(ReadingListModelObserver* observer) {
DCHECK(CalledOnValidThread());
observers_.RemoveObserver(observer);
}
// Batch update methods.
bool ReadingListModel::IsPerformingBatchUpdates() const {
DCHECK(CalledOnValidThread());
return current_batch_updates_count_ > 0;
}
std::unique_ptr<ReadingListModel::ScopedReadingListBatchUpdate>
ReadingListModel::CreateBatchToken() {
return base::MakeUnique<ReadingListModel::ScopedReadingListBatchUpdate>(this);
}
std::unique_ptr<ReadingListModel::ScopedReadingListBatchUpdate>
ReadingListModel::BeginBatchUpdates() {
DCHECK(CalledOnValidThread());
auto token = CreateBatchToken();
++current_batch_updates_count_;
if (current_batch_updates_count_ == 1) {
EnteringBatchUpdates();
}
return token;
}
void ReadingListModel::EnteringBatchUpdates() {
DCHECK(CalledOnValidThread());
for (auto& observer : observers_)
observer.ReadingListModelBeganBatchUpdates(this);
}
void ReadingListModel::EndBatchUpdates() {
DCHECK(CalledOnValidThread());
DCHECK(IsPerformingBatchUpdates());
DCHECK(current_batch_updates_count_ > 0);
--current_batch_updates_count_;
if (current_batch_updates_count_ == 0) {
LeavingBatchUpdates();
}
}
void ReadingListModel::LeavingBatchUpdates() {
DCHECK(CalledOnValidThread());
for (auto& observer : observers_)
observer.ReadingListModelCompletedBatchUpdates(this);
}
ReadingListModel::ScopedReadingListBatchUpdate::
~ScopedReadingListBatchUpdate() {
model_->EndBatchUpdates();
}
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