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// Copyright (c) 2012 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_EXTENSIONS_SYSTEM_INFO_EVENT_ROUTER_H_
#define CHROME_BROWSER_EXTENSIONS_SYSTEM_INFO_EVENT_ROUTER_H_
#include <set>
#include "base/files/file_path.h"
#include "base/memory/singleton.h"
#include "base/values.h"
#include "chrome/browser/extensions/api/system_info_storage/storage_info_provider.h"
#include "ui/gfx/display_observer.h"
namespace extensions {
namespace api {
namespace experimental_system_info_cpu {
struct CpuUpdateInfo;
} // namespace experimental_system_info_cpu
} // namespace api
// Event router for systemInfo API. It is a singleton instance shared by
// multiple profiles.
// TODO(hongbo): It should derive from SystemMonitor::DevicesChangedObserver.
// Since the system_monitor will be refactored along with media_gallery, once
// http://crbug.com/145400 is fixed, we need to update SystemInfoEventRouter
// accordingly.
class SystemInfoEventRouter
: public gfx::DisplayObserver,
public StorageInfoObserver {
public:
static SystemInfoEventRouter* GetInstance();
// Add/remove event listener for the |event_name| event from |profile|.
void AddEventListener(const std::string& event_name);
void RemoveEventListener(const std::string& event_name);
// Return true if the |event_name| is an event from systemInfo namespace.
static bool IsSystemInfoEvent(const std::string& event_name);
// StorageInfoObserver implementation:
virtual void OnStorageFreeSpaceChanged(const std::string& id,
double new_value,
double old_value) OVERRIDE;
// TODO(hongbo): The following methods should be likely overriden from
// SystemMonitor::DevicesChangedObserver once the http://crbug.com/145400
// is fixed.
void OnRemovableStorageAttached(const std::string& id,
const string16& name,
const base::FilePath::StringType& location);
void OnRemovableStorageDetached(const std::string& id);
// gfx::DisplayObserver implementation.
virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE;
virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
private:
friend struct DefaultSingletonTraits<SystemInfoEventRouter>;
SystemInfoEventRouter();
virtual ~SystemInfoEventRouter();
// Called from any thread to dispatch the systemInfo event to all extension
// processes cross multiple profiles.
void DispatchEvent(const std::string& event_name,
scoped_ptr<base::ListValue> args);
// The callbacks of querying storage info to start and stop watching the
// storages. Called from UI thread.
void StartWatchingStorages(const StorageInfo& info, bool success);
void StopWatchingStorages(const StorageInfo& info, bool success);
// The callback for CPU sampling cycle. Called from FILE thread.
void OnNextCpuSampling(
scoped_ptr<api::experimental_system_info_cpu::CpuUpdateInfo> info);
// Called to dispatch the systemInfo.display.onDisplayChanged event.
void OnDisplayChanged();
// Used to record the event names being watched.
std::multiset<std::string> watching_event_set_;
DISALLOW_COPY_AND_ASSIGN(SystemInfoEventRouter);
};
} // namespace extensions
#endif // CHROME_BROWSER_EXTENSIONS_SYSTEM_INFO_EVENT_ROUTER_H_
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