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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 AutoScaling
#
# @attr_reader [String] arn
#
# @attr_reader [String] adjustment_type
#
# @attr_reader [Integer] scaling_adjustment
#
# @attr_reader [Hash] alarms Returns a hash of alarms names (keys)
# to alarm ARNs (values).
#
# @attr_reader [Integer] cooldown
#
# @attr_reader [Integer] min_adjustment_step
#
class ScalingPolicy < Core::Resource
include ScalingPolicyOptions
# @api private
def initialize auto_scaling_group, policy_name, options = {}
@group = auto_scaling_group
@name = policy_name
super
end
# @return [Group]
attr_reader :group
alias_method :auto_scaling_group, :group
# @return [String]
attr_reader :name
attribute :arn, :from => :policy_arn, :static => true
attribute :adjustment_type
attribute :scaling_adjustment
attribute :alarms do
translates_output do |alarms|
alarms.inject({}) do |hash,alarm|
hash.merge(alarm.alarm_name => alarm.alarm_arn)
end
end
end
attribute :cooldown
attribute :min_adjustment_step
populates_from(:describe_policies) do |resp|
resp.scaling_policies.find do |p|
p.policy_name == name and
p.auto_scaling_group_name == group.name
end
end
# Updates this scaling policy.
# @param (see ScalingPolicyOptions#scaling_policy_options)
# @option (see ScalingPolicyOptions#scaling_policy_options)
# @return [nil]
def update options = {}
client_opts = scaling_policy_options(group, name, options)
resp = client.put_scaling_policy(client_opts)
static_attributes[:arn] = resp.policy_arn
nil
end
alias_method :put, :update
# Runs this policy against it's Auto Scaling group.
#
# @param [Hash] options
#
# @option options [Boolean] :honor_cooldown (false) Set to true if you
# want Auto Scaling to reject this request when the Auto Scaling
# group is in cooldown.
#
# @raise [Errors::ScalingActivityInProgress]
#
# @return [nil]
#
def execute options = {}
client_opts = {}
client_opts[:auto_scaling_group_name] = group.name
client_opts[:policy_name] = name
client_opts[:honor_cooldown] = options[:honor_cooldown] == true
client.execute_policy(client_opts)
nil
end
# Deletes this scaling policy.
# @return [nil]
def delete
client_opts = {}
client_opts[:auto_scaling_group_name] = group.name
client_opts[:policy_name] = name
client.delete_policy(client_opts)
nil
end
# @return [Boolean] Returns true if the policy exists.
def exists?
client_opts = {}
client_opts[:auto_scaling_group_name] = group.name
client_opts[:policy_names] = [name]
resp = client.describe_policies(client_opts)
!resp.scaling_policies.empty?
end
protected
def get_resource attr_name = nil
client_opts = {}
client_opts[:auto_scaling_group_name] = group.name
client_opts[:policy_names] = [name]
client.describe_policies(client_opts)
end
def resource_identifiers
[[:group, group], [:name, name]]
end
end
end
end
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