Hypertable::HostSpecification Class Reference

Converts host specification pattern to list of host names. More...

#include <HostSpecification.h>

Collaboration diagram for Hypertable::HostSpecification:

Public Member Functions
	HostSpecification (const std::string &spec)
	Constructor. More...
	operator std::vector< std::string > ()
	Expands host specification pattern to list of hostnames. More...

Private Attributes
const std::string	m_spec
	Host specification pattern. More...

Detailed Description

Converts host specification pattern to list of host names.

Hostnames in a cluster are typically named using a common prefix followed by a number. To facilitate the specification of a large number of hosts, this class introduces a concise host pattern syntax and provides a function to convert a pattern into a list of hostnames. The host pattern syntax can include numeric ranges such as host[00-15] and supports set union '+' and set difference '-' operators (left associative). Host sets can also be grouped using parenthesis. The ',' character is equivalent to the '+' character, so a comma-separated list of host names is a valid host specification pattern as well. The following examples illustrate the host specification pattern syntax:

Pattern	Expansion
host[09-10].hypertable.com	host09.hypertable.com host10.hypertable.com
host[9-10].hypertable.com	host9.hypertable.com host10.hypertable.com
host[01-02] host03	host01 host02 host03
(host[01-03] - host02) + host[04-05]	host01 host03 host04 host05
host01, host02, host03	host01 host02 host03

Definition at line 85 of file HostSpecification.h.

Constructor & Destructor Documentation

Hypertable::HostSpecification::HostSpecification ( const std::string &  spec )

inline

Constructor.

Parameters

spec	Host specification pattern

Definition at line 91 of file HostSpecification.h.

Member Function Documentation

Hypertable::HostSpecification::operator std::vector< std::string >

(

)

Expands host specification pattern to list of hostnames.

The list returned by this function is sorted by hostname. Hostnames that match a specific pattern are sorted numerically by their numeric component.

Returns

List of hostnames represented by m_spec.

Exceptions

Exception

with code set to Error::BAD_FORMAT on bad input

Member Data Documentation

const std::string Hypertable::HostSpecification::m_spec

private

Host specification pattern.

Definition at line 103 of file HostSpecification.h.

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

• /home/doug/src/hypertable/src/cc/Common/HostSpecification.h