Reading List create protobuf store

ios/chrome/browser/reading_list/reading_list_model_impl.cc

 // 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 "ios/chrome/browser/reading_list/reading_list_model_impl.h"
 
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "components/prefs/pref_service.h"
 #include "ios/chrome/browser/reading_list/reading_list_model_storage.h"
+#include "ios/chrome/browser/reading_list/reading_list_pref_names.h"
+#include "ios/web/public/web_thread.h"
 #include "url/gurl.h"
 
-ReadingListModelImpl::ReadingListModelImpl() : ReadingListModelImpl(NULL) {}
+ReadingListModelImpl::ReadingListModelImpl()
+    : ReadingListModelImpl(NULL, NULL) {}
 
 ReadingListModelImpl::ReadingListModelImpl(
-    std::unique_ptr<ReadingListModelStorage> storage)
-    : hasUnseen_(false) {
+    std::unique_ptr<ReadingListModelStorage> storage,
+    PrefService* pref_service)
+    : pref_service_(pref_service),
+      has_unseen_(false),
+      loaded_(false),
+      weak_ptr_factory_(this) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   if (storage) {
-    storageLayer_ = std::move(storage);
-    read_ = storageLayer_->LoadPersistentReadList();
-    unread_ = storageLayer_->LoadPersistentUnreadList();
-    hasUnseen_ = storageLayer_->LoadPersistentHasUnseen();
+    storage_layer_ = std::move(storage);
+    storage_layer_->SetReadingListModel(this);
+    storage_layer_->LoadPersistentLists();
+  } else {
+    loaded_ = true;
+    read_ = base::MakeUnique<ReadingListEntries>();
+    unread_ = base::MakeUnique<ReadingListEntries>();
   }
-  loaded_ = true;
+  has_unseen_ = LoadPersistentHasUnseen();
 }
 ReadingListModelImpl::~ReadingListModelImpl() {}
 
+void ReadingListModelImpl::ModelLoaded(
+    std::unique_ptr<ReadingListEntries> unread,
+    std::unique_ptr<ReadingListEntries> read) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  read_ = std::move(read);
+  unread_ = std::move(unread);
+  loaded_ = true;
+  FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
+                    ReadingListModelLoaded(this));
+}
+
 void ReadingListModelImpl::Shutdown() {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                     ReadingListModelBeingDeleted(this));
   loaded_ = false;
 }
 
 bool ReadingListModelImpl::loaded() const {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   return loaded_;
 }
 
 size_t ReadingListModelImpl::unread_size() const {
-  DCHECK(loaded());
-  return unread_.size();
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  if (!loaded())
+    return 0;
+  return unread_->size();
 }
 
 size_t ReadingListModelImpl::read_size() const {
-  DCHECK(loaded());
-  return read_.size();
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  if (!loaded())
+    return 0;
+  return read_->size();
 }
 
 bool ReadingListModelImpl::HasUnseenEntries() const {
-  DCHECK(loaded());
-  return unread_size() && hasUnseen_;
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  if (!loaded())
+    return false;
+  return unread_size() && has_unseen_;
 }
 
 void ReadingListModelImpl::ResetUnseenEntries() {
   DCHECK(loaded());
-  hasUnseen_ = false;
-  if (storageLayer_ && !IsPerformingBatchUpdates())
-    storageLayer_->SavePersistentHasUnseen(false);
+  has_unseen_ = false;
+  if (!IsPerformingBatchUpdates())
+    SavePersistentHasUnseen(false);
 }
 
 // Returns a specific entry.
 const ReadingListEntry& ReadingListModelImpl::GetUnreadEntryAtIndex(
     size_t index) const {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
-  return unread_[index];
+  return unread_->at(index);
 }
 
 const ReadingListEntry& ReadingListModelImpl::GetReadEntryAtIndex(
     size_t index) const {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
-  return read_[index];
+  return read_->at(index);
 }
 
 bool ReadingListModelImpl::CallbackEntryURL(
     const GURL& url,
     base::Callback<void(const ReadingListEntry&)> callback) const {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
   ReadingListEntry entry(url, std::string());
-  auto resultUnread = std::find(unread_.begin(), unread_.end(), entry);
-  if (resultUnread != unread_.end()) {
+  auto resultUnread = std::find(unread_->begin(), unread_->end(), entry);
+  if (resultUnread != unread_->end()) {
     callback.Run(*resultUnread);
     return true;
   }
 
-  auto resultRead = std::find(read_.begin(), read_.end(), entry);
-  if (resultRead != read_.end()) {
+  auto resultRead = std::find(read_->begin(), read_->end(), entry);
+  if (resultRead != read_->end()) {
     callback.Run(*resultRead);
     return true;
   }
   return false;
 }
 
 void ReadingListModelImpl::RemoveEntryByUrl(const GURL& url) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
   const ReadingListEntry entry(url, std::string());
 
-  auto result = std::find(unread_.begin(), unread_.end(), entry);
-  if (result != unread_.end()) {
+  auto result = std::find(unread_->begin(), unread_->end(), entry);
+  if (result != unread_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillRemoveUnreadEntry(
-                          this, std::distance(unread_.begin(), result)));
-    unread_.erase(result);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentUnreadList(unread_);
+                          this, std::distance(unread_->begin(), result)));
+    unread_->erase(result);
+
+    if (storage_layer_) {
+      storage_layer_->RemoveEntry(*result);
+    }
+
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 
-  result = std::find(read_.begin(), read_.end(), entry);
-  if (result != read_.end()) {
+  result = std::find(read_->begin(), read_->end(), entry);
+  if (result != read_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillRemoveReadEntry(
-                          this, std::distance(read_.begin(), result)));
-    read_.erase(result);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentReadList(read_);
+                          this, std::distance(read_->begin(), result)));
+    read_->erase(result);
+
+    if (storage_layer_) {
+      storage_layer_->RemoveEntry(*result);
+    }
+
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 }
 
 const ReadingListEntry& ReadingListModelImpl::AddEntry(
     const GURL& url,
     const std::string& title) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
   RemoveEntryByUrl(url);
   ReadingListEntry entry(url, title);
   FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                     ReadingListWillAddUnreadEntry(this, entry));
-  unread_.insert(unread_.begin(), std::move(entry));
-  hasUnseen_ = true;
-  if (storageLayer_ && !IsPerformingBatchUpdates()) {
-    storageLayer_->SavePersistentUnreadList(unread_);
-    storageLayer_->SavePersistentHasUnseen(true);
+  has_unseen_ = true;
+  SavePersistentHasUnseen(true);
+  if (storage_layer_) {
+    storage_layer_->SaveEntry(entry, false);
   }
+  unread_->insert(unread_->begin(), std::move(entry));
+
   FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                     ReadingListDidApplyChanges(this));
-  return *unread_.begin();
+  return *unread_->begin();
 }
 
 void ReadingListModelImpl::MarkReadByURL(const GURL& url) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
   ReadingListEntry entry(url, std::string());
-  auto result = std::find(unread_.begin(), unread_.end(), entry);
-  if (result == unread_.end())
+  auto result = std::find(unread_->begin(), unread_->end(), entry);
+  if (result == unread_->end())
     return;
 
   FOR_EACH_OBSERVER(
       ReadingListModelObserver, observers_,
-      ReadingListWillMoveEntry(this, std::distance(unread_.begin(), result)));
+      ReadingListWillMoveEntry(this, std::distance(unread_->begin(), result)));
 
-  read_.insert(read_.begin(), std::move(*result));
-  unread_.erase(result);
+  result->MarkEntryUpdated();
+  if (storage_layer_) {
+    storage_layer_->SaveEntry(*result, true);
+  }
 
-  if (storageLayer_ && !IsPerformingBatchUpdates()) {
-    storageLayer_->SavePersistentUnreadList(unread_);
-    storageLayer_->SavePersistentReadList(read_);
-  }
+  read_->insert(read_->begin(), std::move(*result));
+  unread_->erase(result);
+
   FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                     ReadingListDidApplyChanges(this));
 }
 
 void ReadingListModelImpl::SetEntryTitle(const GURL& url,
                                          const std::string& title) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
   const ReadingListEntry entry(url, std::string());
 
-  auto result = std::find(unread_.begin(), unread_.end(), entry);
-  if (result != unread_.end()) {
+  auto result = std::find(unread_->begin(), unread_->end(), entry);
+  if (result != unread_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillUpdateUnreadEntry(
-                          this, std::distance(unread_.begin(), result)));
+                          this, std::distance(unread_->begin(), result)));
     result->SetTitle(title);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentUnreadList(unread_);
+
+    if (storage_layer_) {
+      storage_layer_->SaveEntry(*result, false);
+    }
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 
-  result = std::find(read_.begin(), read_.end(), entry);
-  if (result != read_.end()) {
+  result = std::find(read_->begin(), read_->end(), entry);
+  if (result != read_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillUpdateReadEntry(
-                          this, std::distance(read_.begin(), result)));
+                          this, std::distance(read_->begin(), result)));
     result->SetTitle(title);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentReadList(read_);
+    if (storage_layer_) {
+      storage_layer_->SaveEntry(*result, true);
+    }
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 }
 
 void ReadingListModelImpl::SetEntryDistilledURL(const GURL& url,
                                                 const GURL& distilled_url) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
   const ReadingListEntry entry(url, std::string());
 
-  auto result = std::find(unread_.begin(), unread_.end(), entry);
-  if (result != unread_.end()) {
+  auto result = std::find(unread_->begin(), unread_->end(), entry);
+  if (result != unread_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillUpdateUnreadEntry(
-                          this, std::distance(unread_.begin(), result)));
+                          this, std::distance(unread_->begin(), result)));
     result->SetDistilledURL(distilled_url);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentUnreadList(unread_);
+    if (storage_layer_) {
+      storage_layer_->SaveEntry(*result, false);
+    }
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 
-  result = std::find(read_.begin(), read_.end(), entry);
-  if (result != read_.end()) {
+  result = std::find(read_->begin(), read_->end(), entry);
+  if (result != read_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillUpdateReadEntry(
-                          this, std::distance(read_.begin(), result)));
+                          this, std::distance(read_->begin(), result)));
     result->SetDistilledURL(distilled_url);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentReadList(read_);
+    if (storage_layer_) {
+      storage_layer_->SaveEntry(*result, true);
+    }
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 }
 
 void ReadingListModelImpl::SetEntryDistilledState(
     const GURL& url,
     ReadingListEntry::DistillationState state) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
   DCHECK(loaded());
   const ReadingListEntry entry(url, std::string());
 
-  auto result = std::find(unread_.begin(), unread_.end(), entry);
-  if (result != unread_.end()) {
+  auto result = std::find(unread_->begin(), unread_->end(), entry);
+  if (result != unread_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillUpdateUnreadEntry(
-                          this, std::distance(unread_.begin(), result)));
+                          this, std::distance(unread_->begin(), result)));
     result->SetDistilledState(state);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentUnreadList(unread_);
+    if (storage_layer_) {
+      storage_layer_->SaveEntry(*result, false);
+    }
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 
-  result = std::find(read_.begin(), read_.end(), entry);
-  if (result != read_.end()) {
+  result = std::find(read_->begin(), read_->end(), entry);
+  if (result != read_->end()) {
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListWillUpdateReadEntry(
-                          this, std::distance(read_.begin(), result)));
+                          this, std::distance(read_->begin(), result)));
     result->SetDistilledState(state);
-    if (storageLayer_ && !IsPerformingBatchUpdates())
-      storageLayer_->SavePersistentReadList(read_);
+    if (storage_layer_) {
+      storage_layer_->SaveEntry(*result, true);
+    }
     FOR_EACH_OBSERVER(ReadingListModelObserver, observers_,
                       ReadingListDidApplyChanges(this));
     return;
   }
 };
 
-void ReadingListModelImpl::EndBatchUpdates() {
-  ReadingListModel::EndBatchUpdates();
-  if (IsPerformingBatchUpdates() || !storageLayer_) {
+void ReadingListModelImpl::LeavingBatchUpdates() {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  ReadingListModel::LeavingBatchUpdates();
+  if (storage_layer_) {
+    SavePersistentHasUnseen(has_unseen_);
+    storage_layer_->CommitTransaction();
+  }
+}
+
+void ReadingListModelImpl::EnteringBatchUpdates() {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  if (storage_layer_) {
+    storage_layer_->BeginTransaction();
+  }
+  ReadingListModel::EnteringBatchUpdates();
+}
+
+void ReadingListModelImpl::SavePersistentHasUnseen(bool has_unseen) {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  if (!pref_service_) {
     return;
   }
-  storageLayer_->SavePersistentUnreadList(unread_);
-  storageLayer_->SavePersistentReadList(read_);
-  storageLayer_->SavePersistentHasUnseen(hasUnseen_);
+  pref_service_->SetBoolean(reading_list::prefs::kReadingListHasUnseenEntries,
+                            has_unseen);
 }
+
+bool ReadingListModelImpl::LoadPersistentHasUnseen() {
+  DCHECK_CURRENTLY_ON(web::WebThread::UI);
+  if (!pref_service_) {
+    return false;
+  }
+  return pref_service_->GetBoolean(
+      reading_list::prefs::kReadingListHasUnseenEntries);
+}