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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.
#ifndef WEBKIT_QUOTA_USAGE_TRACKER_H_
#define WEBKIT_QUOTA_USAGE_TRACKER_H_
#pragma once
#include <list>
#include <map>
#include <set>
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/scoped_callback_factory.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "googleurl/src/gurl.h"
#include "webkit/quota/quota_client.h"
#include "webkit/quota/quota_task.h"
#include "webkit/quota/quota_types.h"
#include "webkit/quota/special_storage_policy.h"
namespace quota {
class ClientUsageTracker;
// A helper class that gathers and tracks the amount of data stored in
// all quota clients.
// An instance of this class is created per storage type.
class UsageTracker : public QuotaTaskObserver {
public:
UsageTracker(const QuotaClientList& clients, StorageType type,
SpecialStoragePolicy* special_storage_policy);
virtual ~UsageTracker();
StorageType type() const { return type_; }
ClientUsageTracker* GetClientTracker(QuotaClient::ID client_id);
void GetGlobalUsage(GlobalUsageCallback* callback);
void GetHostUsage(const std::string& host, HostUsageCallback* callback);
void UpdateUsageCache(QuotaClient::ID client_id,
const GURL& origin,
int64 delta);
void GetCachedHostsUsage(std::map<std::string, int64>* host_usage) const;
void GetCachedOrigins(std::set<GURL>* origins) const;
bool IsWorking() const {
return global_usage_callbacks_.HasCallbacks() ||
host_usage_callbacks_.HasAnyCallbacks();
}
private:
struct TrackingInfo {
TrackingInfo() : pending_clients(0), usage(0), unlimited_usage(0) {}
int pending_clients;
int64 usage;
int64 unlimited_usage;
};
typedef std::map<QuotaClient::ID, ClientUsageTracker*> ClientTrackerMap;
friend class ClientUsageTracker;
void DidGetClientGlobalUsage(StorageType type, int64 usage,
int64 unlimited_usage);
void DidGetClientHostUsage(const std::string& host,
StorageType type,
int64 usage);
const StorageType type_;
ClientTrackerMap client_tracker_map_;
TrackingInfo global_usage_;
std::map<std::string, TrackingInfo> outstanding_host_usage_;
GlobalUsageCallbackQueue global_usage_callbacks_;
HostUsageCallbackMap host_usage_callbacks_;
base::ScopedCallbackFactory<UsageTracker> callback_factory_;
DISALLOW_COPY_AND_ASSIGN(UsageTracker);
};
// This class holds per-client usage tracking information and caches per-host
// usage data. An instance of this class is created per client.
class ClientUsageTracker : public SpecialStoragePolicy::Observer,
public base::NonThreadSafe {
public:
ClientUsageTracker(UsageTracker* tracker,
QuotaClient* client,
StorageType type,
SpecialStoragePolicy* special_storage_policy);
virtual ~ClientUsageTracker();
void GetGlobalUsage(GlobalUsageCallback* callback);
void GetHostUsage(const std::string& host, HostUsageCallback* callback);
void UpdateUsageCache(const GURL& origin, int64 delta);
void GetCachedHostsUsage(std::map<std::string, int64>* host_usage) const;
void GetCachedOrigins(std::set<GURL>* origins) const;
private:
typedef std::set<std::string> HostSet;
typedef std::map<GURL, int64> UsageMap;
typedef std::map<std::string, UsageMap> HostUsageMap;
class GatherUsageTaskBase;
class GatherGlobalUsageTask;
class GatherHostUsageTask;
// Methods used by our GatherUsage tasks, as a task makes progress
// origins and hosts are added incrementally to the cache.
void AddCachedOrigin(const GURL& origin, int64 usage);
void AddCachedHost(const std::string& host);
void GatherGlobalUsageComplete();
void GatherHostUsageComplete(const std::string& host);
int64 GetCachedHostUsage(const std::string& host) const;
int64 GetCachedGlobalUnlimitedUsage();
virtual void OnSpecialStoragePolicyChanged() OVERRIDE;
void NoopHostUsageCallback(
const std::string& host, StorageType type, int64 usage);
bool IsStorageUnlimited(const GURL& origin) const;
UsageTracker* tracker_;
QuotaClient* client_;
const StorageType type_;
int64 global_usage_;
int64 global_unlimited_usage_;
bool global_usage_retrieved_;
bool global_unlimited_usage_is_valid_;
HostSet cached_hosts_;
HostUsageMap cached_usage_;
GatherGlobalUsageTask* global_usage_task_;
GlobalUsageCallbackQueue global_usage_callback_;
std::map<std::string, GatherHostUsageTask*> host_usage_tasks_;
HostUsageCallbackMap host_usage_callbacks_;
scoped_refptr<SpecialStoragePolicy> special_storage_policy_;
DISALLOW_COPY_AND_ASSIGN(ClientUsageTracker);
};
} // namespace quota
#endif // WEBKIT_QUOTA_USAGE_TRACKER_H_
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