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// Copyright 2015 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_DATA_USAGE_TAB_ID_PROVIDER_H_
#define CHROME_BROWSER_DATA_USAGE_TAB_ID_PROVIDER_H_
#include <stdint.h>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/supports_user_data.h"
#include "base/threading/thread_checker.h"
namespace base {
class TaskRunner;
}
namespace tracked_objects {
class Location;
}
namespace chrome_browser_data_usage {
// Object that can be attached to a URLRequest to provide the tab ID of that
// URLRequest to callbacks that want them. Callbacks are either run immediately
// if the tab ID is already available, or queued to be run later once the tab ID
// becomes available.
class TabIdProvider : public base::SupportsUserData::Data {
public:
// Constructs a tab ID provider, posting the |tab_id_getter| task onto
// |task_runner|.
TabIdProvider(base::TaskRunner* task_runner,
const tracked_objects::Location& from_here,
const base::Callback<int32_t(void)>& tab_id_getter);
~TabIdProvider() override;
// Calls |callback| with the tab ID, either immediately if it's already
// available, or later once it becomes available.
void ProvideTabId(const base::Callback<void(int32_t)>& callback);
base::WeakPtr<TabIdProvider> GetWeakPtr();
static const void* kUserDataKey;
private:
class CallbackRunner;
// Called when the |tab_id| is ready.
void OnTabIdReady(int32_t tab_id);
base::ThreadChecker thread_checker_;
bool is_tab_id_ready_;
int32_t tab_id_;
base::WeakPtr<CallbackRunner> weak_callback_runner_;
base::WeakPtrFactory<TabIdProvider> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(TabIdProvider);
};
} // namespace chrome_browser_data_usage
#endif // CHROME_BROWSER_DATA_USAGE_TAB_ID_PROVIDER_H_
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