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require 'net/ssh/multi/session_actions'
module Net; module SSH; module Multi
# A trivial class for representing a subset of servers. It is used
# internally for restricting operations to a subset of all defined
# servers.
#
# subsession = session.with(:app)
# subsession.exec("hostname")
class Subsession
include SessionActions
# The master session that spawned this subsession.
attr_reader :master
# The list of servers that this subsession can operate on.
attr_reader :servers
# Create a new subsession of the given +master+ session, that operates
# on the given +server_list+.
def initialize(master, server_list)
@master = master
@servers = server_list.uniq
end
# Works as Array#slice, but returns a new subsession consisting of the
# given slice of servers in this subsession. The new subsession will have
# the same #master session as this subsession does.
#
# s1 = subsession.slice(0)
# s2 = subsession.slice(3, -1)
# s3 = subsession.slice(1..4)
def slice(*args)
Subsession.new(master, Array(servers.slice(*args)))
end
# Returns a new subsession that consists of only the first server in the
# server list of the current subsession. This is just convenience for
# #slice(0):
#
# s1 = subsession.first
def first
slice(0)
end
end
end; end; end
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