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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 "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"
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 {
const char kSystemInfoEventPrefix[] = "experimental.systemInfo";
const char kStorageEventPrefix[] = "experimental.systemInfo.storage";
const char kCpuEventPrefix[] = "experimental.systemInfo.cpu";
static bool IsStorageEvent(const std::string& event_name) {
return event_name.compare(0, strlen(kStorageEventPrefix),
kStorageEventPrefix) == 0;
}
static bool IsCpuEvent(const std::string& event_name) {
return event_name.compare(0, strlen(kCpuEventPrefix), kCpuEventPrefix) == 0;
}
} // namespace
// static
SystemInfoEventRouter* SystemInfoEventRouter::GetInstance() {
return Singleton<SystemInfoEventRouter>::get();
}
SystemInfoEventRouter::SystemInfoEventRouter() {
}
SystemInfoEventRouter::~SystemInfoEventRouter() {
}
void SystemInfoEventRouter::AddEventListener(const std::string& event_name) {
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)) {
// TODO (hongbo): Start watching storage device information via calling
// SystemMonitor::StartWatchingStorage.
return;
}
// For systemInfo.cpu event.
if (IsCpuEvent(event_name)) {
CpuInfoProvider::Get()->StartSampling(
base::Bind(&SystemInfoEventRouter::OnNextCpuSampling,
base::Unretained(this)));
return;
}
}
void SystemInfoEventRouter::RemoveEventListener(
const std::string& event_name) {
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)) {
// TODO(hongbo): Stop watching storage device information via calling
// SystemMonitor::StopWatchingStorage.
return;
}
if (IsCpuEvent(event_name)) {
CpuInfoProvider::Get()->StopSampling();
}
}
// static
bool SystemInfoEventRouter::IsSystemInfoEvent(const std::string& event_name) {
std::string prefix(kSystemInfoEventPrefix);
return event_name.compare(0, prefix.size(), prefix) == 0;
}
void SystemInfoEventRouter::OnStorageAvailableCapacityChanged(
const std::string& id, int64 available_capacity) {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&SystemInfoEventRouter::OnStorageAvailableCapacityChanged,
base::Unretained(this), id, available_capacity));
return;
}
// We are on the UI thread now.
StorageChangeInfo info;
info.id = id;
info.available_capacity = static_cast<double>(available_capacity);
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 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::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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