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require 'puppet/transaction'
require 'puppet/transaction/event'
# Handle all of the work around performing an actual change,
# including calling 'sync' on the properties and producing events.
class Puppet::Transaction::Change
attr_accessor :is, :should, :path, :property, :changed, :proxy
# Switch the goals of the property, thus running the change in reverse.
def backward
@is, @should = @should, @is
@property.should = @should
@property.info "Reversing %s" % self
return self.go
end
def changed?
self.changed
end
# Create our event object.
def event(name)
# default to a simple event type
unless name.is_a?(Symbol)
@property.warning("Property '%s' returned invalid event '%s'; resetting to default" %
[@property.class, name])
name = @property.event(should)
end
Puppet::Transaction::Event.new(name, self.resource)
end
def initialize(property, currentvalue)
@property = property
@path = [property.path,"change"].flatten
@is = currentvalue
@should = property.should
@changed = false
end
# Perform the actual change. This method can go either forward or
# backward, and produces an event.
def go
if self.noop?
@property.log "is %s, should be %s (noop)" % [property.is_to_s(@is), property.should_to_s(@should)]
return [event(:noop)]
end
# The transaction catches any exceptions here.
events = @property.sync
if events.nil?
events = [(@property.name.to_s + "_changed").to_sym]
elsif events.is_a?(Array)
if events.empty?
events = [(@property.name.to_s + "_changed").to_sym]
end
else
events = [events]
end
return events.collect { |name|
@report = @property.log(@property.change_to_s(@is, @should))
event(name)
}
end
def forward
return self.go
end
# Is our property noop? This is used for generating special events.
def noop?
return @property.noop
end
# The resource that generated this change. This is used for handling events,
# and the proxy resource is used for generated resources, since we can't
# send an event to a resource we don't have a direct relationship. If we
# have a proxy resource, then the events will be considered to be from
# that resource, rather than us, so the graph resolution will still work.
def resource
self.proxy || @property.resource
end
def to_s
return "change %s" % @property.change_to_s(@is, @should)
end
end
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