Get rid of synchronous calls to getting plugins to help with http://codereview.chromium.org/79800...

chrome/browser/plugin_exceptions_table_model.cc

-// Copyright (c) 2011 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/plugin_exceptions_table_model.h"
-
-#include "base/auto_reset.h"
-#include "base/sys_string_conversions.h"
-#include "base/utf_string_conversions.h"
-#include "chrome/common/chrome_notification_types.h"
-#include "content/common/notification_service.h"
-#include "grit/generated_resources.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/models/table_model_observer.h"
-
-PluginExceptionsTableModel::PluginExceptionsTableModel(
-    HostContentSettingsMap* content_settings_map,
-    HostContentSettingsMap* otr_content_settings_map)
-    : map_(content_settings_map),
-      otr_map_(otr_content_settings_map),
-      updates_disabled_(false),
-      observer_(NULL) {
-  registrar_.Add(this, chrome::NOTIFICATION_CONTENT_SETTINGS_CHANGED,
-                 Source<HostContentSettingsMap>(map_));
-  if (otr_map_) {
-    registrar_.Add(this, chrome::NOTIFICATION_CONTENT_SETTINGS_CHANGED,
-                   Source<HostContentSettingsMap>(otr_map_));
-  }
-}
-
-PluginExceptionsTableModel::~PluginExceptionsTableModel() {
-}
-
-bool PluginExceptionsTableModel::CanRemoveRows(const Rows& rows) const {
-  return !rows.empty();
-}
-
-void PluginExceptionsTableModel::RemoveRows(const Rows& rows) {
-  AutoReset<bool> tmp(&updates_disabled_, true);
-  bool reload_all = false;
-  // Iterate over the rows starting with the highest ones so we can delete
-  // entries from |settings_| without the other indices shifting.
-  for (Rows::const_reverse_iterator it = rows.rbegin();
-       it != rows.rend(); ++it) {
-    DCHECK_LT(*it, settings_.size());
-    SettingsEntry entry = settings_[*it];
-    HostContentSettingsMap* map = entry.is_otr ? otr_map_ : map_;
-    map->SetContentSetting(entry.pattern,
-                           ContentSettingsPattern::Wildcard(),
-                           CONTENT_SETTINGS_TYPE_PLUGINS,
-                           resources_[entry.plugin_id],
-                           CONTENT_SETTING_DEFAULT);
-    settings_.erase(settings_.begin() + *it);
-    row_counts_[entry.plugin_id]--;
-    if (!reload_all) {
-      // If we remove the last exception for a plugin, recreate all groups
-      // to get correct IDs.
-      if (row_counts_[entry.plugin_id] == 0)  {
-        reload_all = true;
-      } else {
-        if (observer_)
-          observer_->OnItemsRemoved(*it, 1);
-      }
-    }
-  }
-  if (reload_all) {
-    // This also notifies the observer.
-    ReloadSettings();
-  }
-}
-
-void PluginExceptionsTableModel::RemoveAll() {
-  AutoReset<bool> tmp(&updates_disabled_, true);
-  map_->ClearSettingsForOneType(CONTENT_SETTINGS_TYPE_PLUGINS);
-  if (otr_map_)
-    otr_map_->ClearSettingsForOneType(CONTENT_SETTINGS_TYPE_PLUGINS);
-
-  ClearSettings();
-  if (observer_)
-    observer_->OnModelChanged();
-}
-
-int PluginExceptionsTableModel::RowCount() {
-  return settings_.size();
-}
-
-string16 PluginExceptionsTableModel::GetText(int row, int column_id) {
-  DCHECK_GE(row, 0);
-  DCHECK_LT(row, static_cast<int>(settings_.size()));
-  SettingsEntry& entry = settings_[row];
-  if (column_id == IDS_EXCEPTIONS_PATTERN_HEADER ||
-      column_id == IDS_EXCEPTIONS_HOSTNAME_HEADER) {
-    return UTF8ToUTF16(entry.pattern.ToString());
-  } else if (column_id == IDS_EXCEPTIONS_ACTION_HEADER) {
-    switch (entry.setting) {
-      case CONTENT_SETTING_ALLOW:
-        return l10n_util::GetStringUTF16(IDS_EXCEPTIONS_ALLOW_BUTTON);
-      case CONTENT_SETTING_BLOCK:
-        return l10n_util::GetStringUTF16(IDS_EXCEPTIONS_BLOCK_BUTTON);
-      default:
-        NOTREACHED();
-    }
-  } else {
-    NOTREACHED();
-  }
-  return string16();
-}
-
-bool PluginExceptionsTableModel::HasGroups() {
-  return true;
-}
-
-void PluginExceptionsTableModel::SetObserver(ui::TableModelObserver* observer) {
-  observer_ = observer;
-}
-
-ui::TableModel::Groups PluginExceptionsTableModel::GetGroups() {
-  return groups_;
-}
-
-int PluginExceptionsTableModel::GetGroupID(int row) {
-  DCHECK_LT(row, static_cast<int>(settings_.size()));
-  return settings_[row].plugin_id;
-}
-
-void PluginExceptionsTableModel::Observe(int type,
-                                         const NotificationSource& source,
-                                         const NotificationDetails& details) {
-  if (!updates_disabled_)
-    ReloadSettings();
-}
-
-void PluginExceptionsTableModel::ClearSettings() {
-  settings_.clear();
-  groups_.clear();
-  row_counts_.clear();
-  resources_.clear();
-}
-
-void PluginExceptionsTableModel::GetPlugins(
-    std::vector<webkit::npapi::PluginGroup>* plugin_groups) {
-  webkit::npapi::PluginList::Singleton()->GetPluginGroups(false, plugin_groups);
-}
-
-void PluginExceptionsTableModel::LoadSettings() {
-  int group_id = 0;
-  std::vector<webkit::npapi::PluginGroup> plugins;
-  GetPlugins(&plugins);
-  for (size_t i = 0; i < plugins.size(); ++i) {
-    std::string plugin = plugins[i].identifier();
-    HostContentSettingsMap::SettingsForOneType settings;
-    map_->GetSettingsForOneType(CONTENT_SETTINGS_TYPE_PLUGINS,
-                                plugin,
-                                &settings);
-    HostContentSettingsMap::SettingsForOneType otr_settings;
-    if (otr_map_) {
-      otr_map_->GetSettingsForOneType(CONTENT_SETTINGS_TYPE_PLUGINS,
-                                      plugin,
-                                      &otr_settings);
-    }
-    string16 title = plugins[i].GetGroupName();
-    for (HostContentSettingsMap::SettingsForOneType::iterator setting_it =
-             settings.begin();
-         setting_it != settings.end(); ++setting_it) {
-      SettingsEntry entry = {
-        setting_it->a,
-        group_id,
-        setting_it->c,
-        false
-      };
-      settings_.push_back(entry);
-    }
-    for (HostContentSettingsMap::SettingsForOneType::iterator setting_it =
-             otr_settings.begin();
-         setting_it != otr_settings.end(); ++setting_it) {
-      SettingsEntry entry = {
-        setting_it->a,
-        group_id,
-        setting_it->c,
-        true
-      };
-      settings_.push_back(entry);
-    }
-    int num_plugins = settings.size() + otr_settings.size();
-    if (num_plugins > 0) {
-      Group group = { title, group_id++ };
-      groups_.push_back(group);
-      resources_.push_back(plugin);
-      row_counts_.push_back(num_plugins);
-    }
-  }
-}
-
-void PluginExceptionsTableModel::ReloadSettings() {
-  ClearSettings();
-  LoadSettings();
-
-  if (observer_)
-    observer_->OnModelChanged();
-}