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// Copyright (c) 2010 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_SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_
#define CHROME_BROWSER_SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_
#pragma once
#include <map>
#include "base/message_loop.h"
#include "base/synchronization/lock.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"
namespace browser_sync {
// A class to monitor usage of extensions APIs to send to sync servers, with
// the ability to purge data once sync servers have acknowledged it (successful
// commit response).
//
// This can be used from any thread (it is a 'monitor' in the synchronization
// sense as well), HOWEVER
//
// *** IT MUST BE DELETED FROM THE UI LOOP ***
//
// Consider using MessageLoop::DeleteSoon. (Yes, this means if you allocate
// an ExtensionsActivityMonitor on a thread other than UI, you must 'new' it).
class ExtensionsActivityMonitor : public NotificationObserver {
public:
// A data record of activity performed by extension |extension_id|.
struct Record {
Record() : bookmark_write_count(0U) {}
// The human-readable ID identifying the extension responsible
// for the activity reported in this Record.
std::string extension_id;
// How many times the extension successfully invoked a write
// operation through the bookmarks API since the last CommitMessage.
uint32 bookmark_write_count;
};
typedef std::map<std::string, Record> Records;
// Creates an ExtensionsActivityMonitor to monitor extensions activities on
// BrowserThread::UI.
ExtensionsActivityMonitor();
~ExtensionsActivityMonitor();
// Fills |buffer| with snapshot of current records in constant time by
// swapping. This is done mutually exclusively w.r.t methods of this class.
void GetAndClearRecords(Records* buffer);
// Add |records| piece-wise (by extension id) to the set of active records.
// This is done mutually exclusively w.r.t the methods of this class.
void PutRecords(const Records& records);
// NotificationObserver implementation. Called on |ui_loop_|.
virtual void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
private:
Records records_;
mutable base::Lock records_lock_;
// Used only from UI loop.
NotificationRegistrar registrar_;
};
} // namespace browser_sync
#endif // CHROME_BROWSER_SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_
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