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// 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.
#ifndef CHROME_BROWSER_HISTORY_SHORTCUTS_BACKEND_H_
#define CHROME_BROWSER_HISTORY_SHORTCUTS_BACKEND_H_
#pragma once
#include <map>
#include <string>
#include <vector>
#include "base/atomicops.h"
#include "base/file_path.h"
#include "base/gtest_prod_util.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list_threadsafe.h"
#include "base/string16.h"
#include "base/synchronization/lock.h"
#include "chrome/browser/autocomplete/shortcuts_provider_shortcut.h"
#include "chrome/browser/history/shortcuts_database.h"
#include "content/common/notification_observer.h"
#include "content/common/notification_registrar.h"
#include "googleurl/src/gurl.h"
class Profile;
namespace history {
// This class manages the shortcut provider backend - access to database on the
// db thread, etc.
class ShortcutsBackend : public base::RefCountedThreadSafe<ShortcutsBackend>,
public NotificationObserver {
public:
// |profile| is necessary for profile notifications only and can be NULL in
// unit-tests.
ShortcutsBackend(const FilePath& db_folder_path, Profile* profile);
virtual ~ShortcutsBackend();
// The interface is guaranteed to be called on the thread AddObserver()
// was called.
class ShortcutsBackendObserver {
public:
// Called after the database is loaded and Init() completed.
virtual void OnShortcutsLoaded() = 0;
// This callback is called when addition or change was processed by the
// database.
virtual void OnShortcutAddedOrUpdated(
const shortcuts_provider::Shortcut& shortcut) = 0;
// Called when shortcuts are removed from the database.
virtual void OnShortcutsRemoved(
const std::vector<std::string>& shortcut_ids) = 0;
protected:
virtual ~ShortcutsBackendObserver() {}
};
// Asynchronously initializes the ShortcutsBackend, it is safe to call
// multiple times - only the first call will be processed.
bool Init();
bool initialized() const { return current_state_ == INITIALIZED; }
// Adds the Shortcut to the database.
bool AddShortcut(shortcuts_provider::Shortcut shortcut);
// Updates timing and selection count for the Shortcut.
bool UpdateShortcut(shortcuts_provider::Shortcut shortcut);
// Deletes the Shortcuts with the id.
bool DeleteShortcutsWithIds(const std::vector<std::string>& shortcut_ids);
// Deletes the Shortcuts with the url.
bool DeleteShortcutsWithUrl(const GURL& shortcut_url);
// Replaces the contents of |shortcuts| with the backend's from the database.
bool GetShortcuts(shortcuts_provider::ShortcutMap* shortcuts);
void AddObserver(ShortcutsBackendObserver* obs) {
observer_list_->AddObserver(obs);
}
void RemoveObserver(ShortcutsBackendObserver* obs) {
observer_list_->RemoveObserver(obs);
}
private:
// Internal initialization of the back-end. Posted by Init() to the DB thread.
// On completion notifies all back-end observers asyncronously on their own
// thread.
void InitInternal();
// Internal addition or update of a shortcut. Posted by AddShortcut() or
// UpdateShortcut() to the DB thread. On completion notifies all back-end
// observers asyncronously on their own thread.
void AddOrUpdateShortcutInternal(shortcuts_provider::Shortcut shortcut,
bool add);
// Internal deletion of shortcuts. Posted by DeleteShortcutsWithIds() to the
// DB thread. On completion notifies all back-end observers asyncronously on
// their own thread.
void DeleteShortcutsWithIdsInternal(std::vector<std::string> shortcut_ids);
// Internal deletion of shortcut with the url. Posted by
// DeleteShortcutsWithUrl() to the DB thread. On completion notifies all
// back-end observers asyncronously on their own thread.
void DeleteShortcutsWithUrlInternal(std::string shortcut_url);
// NotificationObserver:
virtual void Observe(int type,
const NotificationSource& source,
const NotificationDetails& details) OVERRIDE;
enum CurrentState {
NOT_INITIALIZED, // Backend created but not initialized.
INITIALIZING, // Init() called, but not completed yet.
INITIALIZED, // Initialization completed, all accessors can be safely
// called.
};
// |current_state_| has values of CurrentState enum.
volatile base::subtle::Atomic32 current_state_;
scoped_refptr<ObserverListThreadSafe<ShortcutsBackendObserver> >
observer_list_;
ShortcutsDatabase db_;
shortcuts_provider::ShortcutMap shortcuts_map_;
// This is a helper map for quick access to a shortcut by guid.
shortcuts_provider::GuidToShortcutsIteratorMap guid_map_;
base::Lock data_access_lock_;
NotificationRegistrar notification_registrar_;
DISALLOW_COPY_AND_ASSIGN(ShortcutsBackend);
};
} // namespace history
#endif // CHROME_BROWSER_HISTORY_SHORTCUTS_BACKEND_H_
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