Hypertable::HyperspaceTableCache Class Reference

Provides efficient lookup of Hyperspace table data. More...

#include <HyperspaceTableCache.h>

Collaboration diagram for Hypertable::HyperspaceTableCache:

Classes
class	Entry
	Cache entry for Hyperspace table data. More...

Public Member Functions
	HyperspaceTableCache (Hyperspace::SessionPtr &hyperspace, const String &toplevel_dir)
	Constructor. More...
bool	get (const String &table_id, Entry &entry)
	Returns Hyperspace cache entry for a table. More...

Private Types
typedef std::map< String, Entry >	TableEntryMap
	Table ID to Entry map type. More...

Private Member Functions
void	map_table_schemas (const String &parent, const std::vector< Hyperspace::DirEntryAttr > &listing)
	Recursively populates map with table schemas. More...
void	map_maintenance_disabled (const String &parent, const std::vector< Hyperspace::DirEntryAttr > &listing)
	Recursively updates maintenance_disabled field in map entries. More...

Private Attributes
TableEntryMap	m_map
	Table ID to Entry map More...

Detailed Description

Provides efficient lookup of Hyperspace table data.

This class efficiently reads schema and maintenance_disabled attribute for all tables in Hyperspace into memory and provides an API for fast lookup.

Definition at line 47 of file HyperspaceTableCache.h.

Member Typedef Documentation

typedef std::map<String, Entry> Hypertable::HyperspaceTableCache::TableEntryMap

private

Table ID to Entry map type.

Definition at line 91 of file HyperspaceTableCache.h.

Constructor & Destructor Documentation

HyperspaceTableCache::HyperspaceTableCache	(	Hyperspace::SessionPtr &	hyperspace,
		const String &	toplevel_dir
	)

Constructor.

This constructor reads table information (schemas and maintenance_disabled attribute) from Hyperspace and caches the information in an in-memory map (m_map) with the key being the table ID.

Parameters

hyperspace	&Hyperspace session
toplevel_dir	Toplevel hyperspace directory

Definition at line 37 of file HyperspaceTableCache.cc.

Member Function Documentation

bool HyperspaceTableCache::get	(	const String &	table_id,
		Entry &	entry
	)

Returns Hyperspace cache entry for a table.

Parameters

table_id	Table identifier string
entry	Reference to Entry object to be filled in

Returns

true if cache entry found for table_id, false otherwise.

Definition at line 53 of file HyperspaceTableCache.cc.

void HyperspaceTableCache::map_maintenance_disabled ( const String &  parent, const std::vector< Hyperspace::DirEntryAttr > &  listing  )

private

Recursively updates maintenance_disabled field in map entries.

Parameters

parent	Parent ID pathname
listing	Vector of directory entries within parent

Definition at line 77 of file HyperspaceTableCache.cc.

void HyperspaceTableCache::map_table_schemas ( const String &  parent, const std::vector< Hyperspace::DirEntryAttr > &  listing  )

private

Recursively populates map with table schemas.

Parameters

parent	Parent ID pathname
listing	Vector of directory entries within parent

Definition at line 62 of file HyperspaceTableCache.cc.

Member Data Documentation

TableEntryMap Hypertable::HyperspaceTableCache::m_map

private

Table ID to Entry map

Definition at line 94 of file HyperspaceTableCache.h.

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

• /home/doug/src/hypertable/src/cc/Hypertable/RangeServer/HyperspaceTableCache.h
• /home/doug/src/hypertable/src/cc/Hypertable/RangeServer/HyperspaceTableCache.cc