FIXME: This isn’t documented in Nutshell.

Since MonitorMixin.new_cond returns a ConditionVariable, and the example above calls while_wait and signal, this class should be documented.

Represents an XML Instruction; IE, <? … ?> TODO: Add parent arg (3rd arg) to constructor

A test case for Gem::Installer.

Subclass of StreamUI that instantiates the user interaction using STDIN, STDOUT, and STDERR.

Raised when memory allocation fails.

OpenSSL::Config

Configuration for the openssl library.

Many system’s installation of openssl library will depend on your system configuration. See the value of OpenSSL::Config::DEFAULT_CONFIG_FILE for the location of the file for your host.

See also www.openssl.org/docs/apps/config.html

General error for openssl library configuration files. Including formatting, parsing errors, etc.

Error raised when an error occurs on the underlying communication protocol.

Class responsible for converting between an object and its id.

This, the default implementation, uses an object’s local ObjectSpace __id__ as its id. This means that an object’s identification over drb remains valid only while that object instance remains alive within the server runtime.

For alternative mechanisms, see DRb::TimerIdConv in rdb/timeridconv.rb and DRbNameIdConv in sample/name.rb in the full drb distribution.

Class handling the connection between a DRbObject and the server the real object lives on.

This class maintains a pool of connections, to reduce the overhead of starting and closing down connections for each method call.

This class is used internally by DRbObject. The user does not normally need to deal with it directly.

Class responsible for converting between an object and its id.

This, the default implementation, uses an object’s local ObjectSpace __id__ as its id. This means that an object’s identification over drb remains valid only while that object instance remains alive within the server runtime.

For alternative mechanisms, see DRb::TimerIdConv in rdb/timeridconv.rb and DRbNameIdConv in sample/name.rb in the full drb distribution.

Gateway id conversion forms a gateway between different DRb protocols or networks.

The gateway needs to install this id conversion and create servers for each of the protocols or networks it will be a gateway between. It then needs to create a server that attaches to each of these networks. For example:

require 'drb/drb'
require 'drb/unix'
require 'drb/gw'

DRb.install_id_conv DRb::GWIdConv.new
gw = DRb::GW.new
s1 = DRb::DRbServer.new 'drbunix:/path/to/gateway', gw
s2 = DRb::DRbServer.new 'druby://example:10000', gw

s1.thread.join
s2.thread.join

Each client must register services with the gateway, for example:

DRb.start_service 'drbunix:', nil # an anonymous server
gw = DRbObject.new nil, 'drbunix:/path/to/gateway'
gw[:unix] = some_service
DRb.thread.join

Timer id conversion keeps objects alive for a certain amount of time after their last access. The default time period is 600 seconds and can be changed upon initialization.

To use TimerIdConv:

DRb.install_id_conv TimerIdConv.new 60 # one minute

Eigenvalues and eigenvectors of a real matrix.

Computes the eigenvalues and eigenvectors of a matrix A.

If A is diagonalizable, this provides matrices V and D such that A = V*D*V.inv, where D is the diagonal matrix with entries equal to the eigenvalues and V is formed by the eigenvectors.

If A is symmetric, then V is orthogonal and thus A = V*D*V.t

For an m-by-n matrix A with m >= n, the LU decomposition is an m-by-n unit lower triangular matrix L, an n-by-n upper triangular matrix U, and a m-by-m permutation matrix P so that L*U = P*A. If m < n, then L is m-by-m and U is m-by-n.

The LUP decomposition with pivoting always exists, even if the matrix is singular, so the constructor will never fail. The primary use of the LU decomposition is in the solution of square systems of simultaneous linear equations. This will fail if singular? returns true.

506 Variant Also Negotiates - RFC 2295; experimental

Command is not supported on server.

Gem::ConfigFile RubyGems options and gem command options from gemrc.

gemrc is a YAML file that uses strings to match gem command arguments and symbols to match RubyGems options.

Gem command arguments use a String key that matches the command name and allow you to specify default arguments:

install: --no-rdoc --no-ri
update: --no-rdoc --no-ri

You can use gem: to set default arguments for all commands.

RubyGems options use symbol keys. Valid options are:

:backtrace

See backtrace

:sources

Sets Gem::sources

:verbose

See verbose

gemrc files may exist in various locations and are read and merged in the following order:

• system wide (/etc/gemrc)

• per user (~/.gemrc)

• per environment (gemrc files listed in the GEMRC environment variable)