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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.
#include "chrome/browser/extensions/system_info_event_router.h"
#include "base/bind.h"
#include "base/memory/scoped_ptr.h"
#include "base/string_util.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/extensions/event_router_forwarder.h"
#include "chrome/browser/extensions/event_names.h"
#include "chrome/browser/extensions/api/system_info_cpu/cpu_info_provider.h"
#include "chrome/browser/extensions/api/system_info_storage/storage_info_provider.h"
#include "chrome/common/extensions/api/experimental_system_info_cpu.h"
#include "chrome/common/extensions/api/experimental_system_info_storage.h"
#if defined(USE_ASH)
#include "ash/screen_ash.h"
#include "ash/shell.h"
#endif
namespace extensions {
using api::experimental_system_info_cpu::CpuUpdateInfo;
using api::experimental_system_info_storage::StorageUnitInfo;
using api::experimental_system_info_storage::StorageChangeInfo;
using content::BrowserThread;
namespace {
// The display events use the "systemInfo" prefix.
const char kSystemInfoEventPrefix[] = "systemInfo";
const char kDisplayEventPrefix[] = "systemInfo.display";
// The storage and cpu events still use the "experimental.systemInfo" prefix.
const char kExperimentalSystemInfoEventPrefix[] = "experimental.systemInfo";
const char kStorageEventPrefix[] = "experimental.systemInfo.storage";
const char kCpuEventPrefix[] = "experimental.systemInfo.cpu";
static bool IsDisplayEvent(const std::string& event_name) {
return StartsWithASCII(event_name, kDisplayEventPrefix, true);
}
static bool IsStorageEvent(const std::string& event_name) {
return StartsWithASCII(event_name, kStorageEventPrefix, true);
}
static bool IsCpuEvent(const std::string& event_name) {
return StartsWithASCII(event_name, kCpuEventPrefix, true);
}
} // namespace
// static
SystemInfoEventRouter* SystemInfoEventRouter::GetInstance() {
return Singleton<SystemInfoEventRouter>::get();
}
SystemInfoEventRouter::SystemInfoEventRouter() {
}
SystemInfoEventRouter::~SystemInfoEventRouter() {
}
void SystemInfoEventRouter::StartWatchingStorages(
const StorageInfo& info, bool success) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!success)
return;
for (StorageInfo::const_iterator it = info.begin(); it != info.end(); ++it) {
StorageInfoProvider::Get()->StartWatching((*it)->id);
}
}
void SystemInfoEventRouter::StopWatchingStorages(
const StorageInfo& info, bool success) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!success)
return;
for (StorageInfo::const_iterator it = info.begin(); it != info.end(); ++it) {
StorageInfoProvider::Get()->StopWatching((*it)->id);
}
}
void SystemInfoEventRouter::AddEventListener(const std::string& event_name) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
watching_event_set_.insert(event_name);
if (watching_event_set_.count(event_name) > 1)
return;
// Start watching the |event_name| event if the first event listener arrives.
// For systemInfo.storage event.
if (IsStorageEvent(event_name)) {
StorageInfoProvider::Get()->AddObserver(this);
StorageInfoProvider::Get()->StartQueryInfo(
base::Bind(&SystemInfoEventRouter::StartWatchingStorages,
base::Unretained(this)));
return;
}
// For systemInfo.cpu event.
if (IsCpuEvent(event_name)) {
CpuInfoProvider::Get()->StartSampling(
base::Bind(&SystemInfoEventRouter::OnNextCpuSampling,
base::Unretained(this)));
return;
}
// For systemInfo.display event.
if (IsDisplayEvent(event_name)) {
#if defined(USE_ASH)
ash::Shell::GetScreen()->AddObserver(this);
#endif
}
}
void SystemInfoEventRouter::RemoveEventListener(
const std::string& event_name) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
watching_event_set_.erase(event_name);
if (watching_event_set_.count(event_name) > 0)
return;
// In case of the last event listener is removed, we need to stop watching
// it to avoid unnecessary overhead.
if (IsStorageEvent(event_name)) {
StorageInfoProvider::Get()->StartQueryInfo(
base::Bind(&SystemInfoEventRouter::StopWatchingStorages,
base::Unretained(this)));
StorageInfoProvider::Get()->RemoveObserver(this);
}
if (IsCpuEvent(event_name)) {
CpuInfoProvider::Get()->StopSampling();
}
if (IsDisplayEvent(event_name)) {
#if defined(USE_ASH)
ash::Shell::GetScreen()->RemoveObserver(this);
#endif
}
}
// static
bool SystemInfoEventRouter::IsSystemInfoEvent(const std::string& event_name) {
// TODO(hshi): simplify this once all systemInfo APIs are out of experimental.
return (StartsWithASCII(event_name, kSystemInfoEventPrefix, true) ||
StartsWithASCII(event_name, kExperimentalSystemInfoEventPrefix,
true));
}
// Called on UI thread since the observer is added from UI thread.
void SystemInfoEventRouter::OnStorageFreeSpaceChanged(
const std::string& id, double new_value, double old_value) {
StorageChangeInfo info;
info.id = id;
info.available_capacity = static_cast<double>(new_value);
scoped_ptr<base::ListValue> args(new base::ListValue());
args->Append(info.ToValue().release());
DispatchEvent(event_names::kOnStorageAvailableCapacityChanged, args.Pass());
}
void SystemInfoEventRouter::OnRemovableStorageAttached(const std::string& id,
const string16& name, const base::FilePath::StringType& location) {
// TODO(hongbo): Handle storage device arrival/removal event.
}
void SystemInfoEventRouter::OnRemovableStorageDetached(const std::string& id) {
// TODO(hongbo): Same as above.
}
void SystemInfoEventRouter::OnDisplayBoundsChanged(
const gfx::Display& display) {
OnDisplayChanged();
}
void SystemInfoEventRouter::OnDisplayAdded(const gfx::Display& new_display) {
OnDisplayChanged();
}
void SystemInfoEventRouter::OnDisplayRemoved(const gfx::Display& old_display) {
OnDisplayChanged();
}
void SystemInfoEventRouter::OnDisplayChanged() {
scoped_ptr<base::ListValue> args(new base::ListValue());
DispatchEvent(event_names::kOnDisplayChanged, args.Pass());
}
void SystemInfoEventRouter::DispatchEvent(const std::string& event_name,
scoped_ptr<base::ListValue> args) {
g_browser_process->extension_event_router_forwarder()->
BroadcastEventToRenderers(event_name, args.Pass(), GURL());
}
void SystemInfoEventRouter::OnNextCpuSampling(scoped_ptr<CpuUpdateInfo> info) {
scoped_ptr<base::ListValue> args(new base::ListValue());
args->Append(info->ToValue().release());
DispatchEvent(event_names::kOnCpuUpdated, args.Pass());
}
} // namespace extensions
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