Ondisk_Storage_Manager< T > Class Template Reference

Storage manager that interacts with either main memory entities or on-disk entities (or both for hybrid). More...

#include <ondisk_storage_manager.h>

Inheritance diagram for Ondisk_Storage_Manager< T >:

List of all members.

Public Member Functions
	Ondisk_Storage_Manager (Hazy_Database *db_conn, struct ondisk_storage_spec *spec)
	Constructor that takes database connector and ondisk storage spec.
void	resort (struct hazy_model &m)
	Makes a resort to reorganize entities according to their epsilon values.
void	incrementalUpdate (struct hazy_model &m, double &waste_time)
	Makes an incremental update on the entities by using hazy model.
virtual void	insertEntity (struct hazy_model &m, key e, T f)=0
	Inserts the entity to the storage manager.
void	getEntityClass (key e, sClass &c, struct hazy_model &m)
	Retrieves the class of the entity.
void	getNumInClass (sClass c, int &nClass, struct hazy_model &m, double &waste_time)
	Retrieves # of elements that belong to a given class.
	~Ondisk_Storage_Manager ()
	Destructor.
Protected Member Functions
void	updateInternalTable (struct hazy_model &m)
	Updates internal table from given model and bias First, the internal table is clustered on new epsilon values based on the hazy model.
void	update_disk_region (struct hazy_model &hm, double lower_bound, double upper_bound, double &waste_time)
	This function updates a disk region The hybrid calls it (via a friend method) : *** This is factored this way for optimization.
void	rescan (struct hazy_model &hm)
	Helper function for naive eager that recreates the external table.
void	setup (bool bRebuild, struct hazy_model &hm)
	Does initial setup If bRebuild is true, recreates all prepared statements and tables.
Protected Attributes
std::string	external_table_name
	External results table name for on-disk.
std::string	hazy_intermediate_table_name
	Internal results table for on-disk.
hazy_model::strategy	_strategy
int	unique_id_for_ps
	unique id for prepared statements in order to prevent any conflict in the same database connection, there cannot be prepared statements with exact same name

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Detailed Description

template<class T>
class Ondisk_Storage_Manager< T >

Storage manager that interacts with either main memory entities or on-disk entities (or both for hybrid).

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Constructor & Destructor Documentation

template<class T>

Ondisk_Storage_Manager< T >::Ondisk_Storage_Manager	(	Hazy_Database *	db_conn,
		struct ondisk_storage_spec *	spec
	)

Constructor that takes database connector and ondisk storage spec.

Parameters:

[in]	db_conn	database connection
[in]	spec	ondisk_storage_spec

template<class T>

Ondisk_Storage_Manager< T >::~Ondisk_Storage_Manager

(

)

Destructor.

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Member Function Documentation

template<class T>

void Ondisk_Storage_Manager< T >::getEntityClass	(	key	e,
		sClass &	c,
		struct hazy_model &	m
	)			[virtual]

Retrieves the class of the entity.

Parameters:

[in]	e	entitiy id
[out]	c	class of the entity
[in]	m	hazy model that we use to classify the entity

Implements Storage_Manager< T >.

template<class T>

void Ondisk_Storage_Manager< T >::getNumInClass	(	sClass	c,
		int &	nClass,
		struct hazy_model &	m,
		double &	waste_time
	)			[virtual]

Retrieves # of elements that belong to a given class.

Parameters:

[in]	c	class that we ask # of elements belong it
[out]	nClass	# of elements in the class
[in]	m	hazy model that we use to classify entities
[out]	waste_time	waste time calculated during the method execution

Implements Storage_Manager< T >.

template<class T>

void Ondisk_Storage_Manager< T >::incrementalUpdate	(	struct hazy_model &	m,
		double &	waste_time
	)			[virtual]

Makes an incremental update on the entities by using hazy model.

Parameters:

[in]	m	hazy model that we use to update entities classes
[out]	waste_time	waste time calcaulted during the method execution

Implements Storage_Manager< T >.

template<class T>

virtual void Ondisk_Storage_Manager< T >::insertEntity	(	struct hazy_model &	m,
		key	e,
		T	f
	)			[pure virtual]

Inserts the entity to the storage manager.

Parameters:

[in]	m	hazy model which is used when the approach is hazy, because we need to calculate eps value
[in]	e	id of the entity
[in]	f	feature vector of the entity

Implements Storage_Manager< T >.

Implemented in Ondisk_Storage_Manager_Dense, and Ondisk_Storage_Manager_Sparse.

template<class T>

void Ondisk_Storage_Manager< T >::rescan

(

struct hazy_model &

hm

)

[protected]

Helper function for naive eager that recreates the external table.

Parameters:

[in]

hm

hazy model

template<class T>

void Ondisk_Storage_Manager< T >::resort

(

struct hazy_model &

m

)

[virtual]

Makes a resort to reorganize entities according to their epsilon values.

Parameters:

[in]

m

hazy model that we use to re-calculate epsllon values

Implements Storage_Manager< T >.

template<class T>

void Ondisk_Storage_Manager< T >::setup	(	bool	bRebuild,
		struct hazy_model &	hm
	)			[protected]

Does initial setup If bRebuild is true, recreates all prepared statements and tables.

Then, fills internal and external tables by using hazy model

Parameters:

[in]	bRebuild	If this is true, then all tables and prepared statements are created
[in]	hm	hazy model

template<class T>

void Ondisk_Storage_Manager< T >::update_disk_region	(	struct hazy_model &	hm,
		double	lower_bound,
		double	upper_bound,
		double &	waste_time
	)			[protected]

This function updates a disk region The hybrid calls it (via a friend method) : *** This is factored this way for optimization.

The input is a model and X = [lower_bound, upper_bound] NB: The region is inclusive. for each tuple t s.t. t.eps in X, we reclassify them with the model.

Parameters:

[in]	hm	hazy model
[in]	lower_bound	low water
[in]	upper_bound	high water
[out]	waste_time

template<class T>

void Ondisk_Storage_Manager< T >::updateInternalTable

(

struct hazy_model &

m

)

[protected]

Updates internal table from given model and bias First, the internal table is clustered on new epsilon values based on the hazy model.

Then necessary indexes are created

Parameters:

[in]

m

hazy_model

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Member Data Documentation

template<class T>

hazy_model::strategy Ondisk_Storage_Manager< T >::_strategy [protected]

template<class T>

std::string Ondisk_Storage_Manager< T >::external_table_name [protected]

External results table name for on-disk.

template<class T>

std::string Ondisk_Storage_Manager< T >::hazy_intermediate_table_name [protected]

Internal results table for on-disk.

template<class T>

int Ondisk_Storage_Manager< T >::unique_id_for_ps [protected]

unique id for prepared statements in order to prevent any conflict in the same database connection, there cannot be prepared statements with exact same name

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The documentation for this class was generated from the following files:

• ondisk_storage_manager.h
• ondisk_storage_manager.hxx

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