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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
module AWS
class ELB
# A collection that help maanage the availability zones for
# a load balancer.
#
# load_balancer = AWS::ELB.new.load_balancers['my-load-balancer']
#
# zones = load_balancer.availability_zones
#
# # adding zones
# zones.enable('us-west-2b', 'us-west-2c')
#
# # removing zones
# zones.disable('us-west-2b')
#
# # enumerating enabled zones
# zones.each do |zone|
# puts zone.name
# end
#
class AvailabilityZoneCollection
include Core::Collection::Simple
# @param [LoadBalancer] load_balancer The load balancer this list of
# availability zones belongs to.
def initialize load_balancer, options = {}
@load_balancer = load_balancer
super
end
# @return [LoadBalancer] Returns the load balancer this list describes.
attr_reader :load_balancer
# Adds one or more EC2 Availability Zones to the load balancer.
#
# load_balancer.availability_zones.enable("us-west-2a", "us-west-2b")
#
# You can also pass {EC2::AvailabilityZone} objects:
#
# # enable all availabilty zones for this region
# zones = AWS::EC2.new.availability_zones.to_a
# load_balancer.availability_zones.enable(zones)
#
# The load balancer evenly distributes requests across all its
# registered availability zones that contain instances. As a result,
# the client must ensure that its load balancer is appropriately
# scaled for each registered Availability Zone.
#
# @param [String,EC2::AvailabilityZone] availability_zones One or more
# availability zone names (strings) or objects {EC2::AvailabilityZone}.
#
# @return [nil]
#
def enable *availability_zones
names = availability_zones.flatten.collect do |av|
av.is_a?(EC2::AvailabilityZone) ? av.name : av.to_s
end
client.enable_availability_zones_for_load_balancer(
:load_balancer_name => load_balancer.name,
:availability_zones => names)
nil
end
# Removes the specified EC2 availability zones from the set of
# configured availability zones for the load balancer.
#
# load_balancer.availability_zones.disable("us-west-2a", "us-west-2b")
#
# You can also pass {EC2::AvailabilityZone} objects:
#
# # disable all availabilty zones
# zones = AWS::EC2.new.availability_zones.to_a
# load_balancer.availability_zones.disable(zones)
#
# There must be at least one availability zone registered with a
# load balancer at all times. A client cannot remove all the availability
# zones from a load balancer. Once an availability zone is removed,
# all the instances registered with the load balancer that are in the
# removed availability zone go into the out of service state.
#
# Upon availability zone removal, the load balancer attempts to
# equally balance the traffic among its remaining usable availability
# zones. Trying to remove an availability zone that was not
# associated with the load balancer does nothing.
#
# @param [String,EC2::AvailabilityZone] availability_zones One or more
# availability zone names (strings) or objects {EC2::AvailabilityZone}.
#
# @return [nil]
#
def disable *availability_zones
names = availability_zones.flatten.collect do |av|
av.is_a?(EC2::AvailabilityZone) ? av.name : av.to_s
end
client.disable_availability_zones_for_load_balancer(
:load_balancer_name => load_balancer.name,
:availability_zones => names)
nil
end
protected
def _each_item options = {}, &block
load_balancer.availability_zone_names.each do |az_name|
availability_zone = EC2::AvailabilityZone.new(
az_name, :config => config)
yield(availability_zone)
end
end
end
end
end
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