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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.
#ifndef CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_TABLES_H_
#define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_TABLES_H_
#include <map>
#include <string>
#include <vector>
#include "base/time/time.h"
#include "chrome/browser/predictors/predictor_table_base.h"
#include "chrome/browser/predictors/resource_prefetch_common.h"
#include "url/gurl.h"
#include "webkit/glue/resource_type.h"
namespace sql {
class Statement;
}
namespace predictors {
// Interface for database tables used by the ResourcePrefetchPredictor.
// All methods except the constructor and destructor need to be called on the DB
// thread.
//
// Currently manages:
// - UrlResourceTable - resources per Urls.
// - UrlMetadataTable - misc data for Urls (like last visit time).
// - HostResourceTable - resources per host.
// - HostMetadataTable - misc data for hosts.
class ResourcePrefetchPredictorTables : public PredictorTableBase {
public:
// Used in the UrlResourceTable and HostResourceTable to store resources
// required for the page or host.
struct ResourceRow {
ResourceRow();
ResourceRow(const ResourceRow& other);
ResourceRow(const std::string& main_frame_url,
const std::string& resource_url,
ResourceType::Type resource_type,
int number_of_hits,
int number_of_misses,
int consecutive_misses,
double average_position);
void UpdateScore();
bool operator==(const ResourceRow& rhs) const;
// Stores the host for host based data, main frame Url for the Url based
// data. This field is cleared for efficiency reasons and the code outside
// this class should not assume it is set.
std::string primary_key;
GURL resource_url;
ResourceType::Type resource_type;
int number_of_hits;
int number_of_misses;
int consecutive_misses;
double average_position;
// Not stored.
float score;
};
typedef std::vector<ResourceRow> ResourceRows;
// Sorts the ResourceRows by score, descending.
struct ResourceRowSorter {
bool operator()(const ResourceRow& x, const ResourceRow& y) const;
};
// Aggregated data for a Url or Host. Although the data differs slightly, we
// store them in the same structure, because most of the fields are common and
// it allows us to use the same functions.
struct PrefetchData {
PrefetchData(PrefetchKeyType key_type, const std::string& primary_key);
PrefetchData(const PrefetchData& other);
~PrefetchData();
bool operator==(const PrefetchData& rhs) const;
bool is_host() const { return key_type == PREFETCH_KEY_TYPE_HOST; }
// Is the data a host as opposed to a Url?
PrefetchKeyType key_type; // Not const to be able to assign.
std::string primary_key; // is_host() ? main frame url : host.
base::Time last_visit;
ResourceRows resources;
};
// Map from primary key to PrefetchData for the key.
typedef std::map<std::string, PrefetchData> PrefetchDataMap;
// Returns data for all Urls and Hosts.
virtual void GetAllData(PrefetchDataMap* url_data_map,
PrefetchDataMap* host_data_map);
// Updates data for a Url and a host. If either of the |url_data| or
// |host_data| has an empty primary key, it will be ignored.
// Note that the Urls and primary key in |url_data| and |host_data| should be
// less than |kMaxStringLength| in length.
virtual void UpdateData(const PrefetchData& url_data,
const PrefetchData& host_data);
// Delete data for the input |urls| and |hosts|.
virtual void DeleteData(const std::vector<std::string>& urls,
const std::vector<std::string>& hosts);
// Wrapper over DeleteData for convenience.
virtual void DeleteSingleDataPoint(const std::string& key,
PrefetchKeyType key_type);
// Deletes all data in all the tables.
virtual void DeleteAllData();
// The maximum length of the string that can be stored in the DB.
static const size_t kMaxStringLength;
private:
friend class PredictorDatabaseInternal;
friend class MockResourcePrefetchPredictorTables;
ResourcePrefetchPredictorTables();
virtual ~ResourcePrefetchPredictorTables();
// Helper functions below help perform functions on the Url and host table
// using the same code.
void GetAllDataHelper(PrefetchKeyType key_type,
PrefetchDataMap* data_map,
std::vector<std::string>* to_delete);
bool UpdateDataHelper(const PrefetchData& data);
void DeleteDataHelper(PrefetchKeyType key_type,
const std::vector<std::string>& keys);
// Returns true if the strings in the |data| are less than |kMaxStringLength|
// in length.
bool StringsAreSmallerThanDBLimit(const PrefetchData& data) const;
// PredictorTableBase methods.
virtual void CreateTableIfNonExistent() OVERRIDE;
virtual void LogDatabaseStats() OVERRIDE;
// Helpers to return Statements for cached Statements. The caller must take
// ownership of the return Statements.
sql::Statement* GetUrlResourceDeleteStatement();
sql::Statement* GetUrlResourceUpdateStatement();
sql::Statement* GetUrlMetadataDeleteStatement();
sql::Statement* GetUrlMetadataUpdateStatement();
sql::Statement* GetHostResourceDeleteStatement();
sql::Statement* GetHostResourceUpdateStatement();
sql::Statement* GetHostMetadataDeleteStatement();
sql::Statement* GetHostMetadataUpdateStatement();
DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictorTables);
};
} // namespace predictors
#endif // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_TABLES_H_
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