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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.
#include "content/browser/gamepad/gamepad_service.h"
#include "base/bind.h"
#include "base/memory/singleton.h"
#include "content/browser/gamepad/data_fetcher.h"
#include "content/browser/gamepad/gamepad_provider.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_source.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/render_process_host.h"
namespace content {
GamepadService::GamepadService() : num_readers_(0) {
}
GamepadService::~GamepadService() {
}
GamepadService* GamepadService::GetInstance() {
return Singleton<GamepadService>::get();
}
void GamepadService::Start(
GamepadDataFetcher* data_fetcher,
content::RenderProcessHost* associated_rph) {
num_readers_++;
if (!provider_)
provider_ = new GamepadProvider(data_fetcher);
DCHECK(num_readers_ > 0);
provider_->Resume();
content::BrowserThread::PostTask(
content::BrowserThread::UI,
FROM_HERE,
base::Bind(&GamepadService::RegisterForCloseNotification,
base::Unretained(this),
associated_rph));
}
void GamepadService::RegisterForCloseNotification(
content::RenderProcessHost* rph) {
registrar_.Add(this,
content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
content::Source<content::RenderProcessHost>(rph));
}
base::SharedMemoryHandle GamepadService::GetSharedMemoryHandle(
base::ProcessHandle handle) {
return provider_->GetRendererSharedMemoryHandle(handle);
}
void GamepadService::Stop() {
--num_readers_;
DCHECK(num_readers_ >= 0);
if (num_readers_ == 0)
provider_->Pause();
}
void GamepadService::Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) {
DCHECK(type == content::NOTIFICATION_RENDERER_PROCESS_CLOSED);
content::BrowserThread::PostTask(
content::BrowserThread::IO,
FROM_HERE,
base::Bind(&GamepadService::Stop, base::Unretained(this)));
}
} // namespace content
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