Class: Aws::AutoScaling::ScalingPolicy

Inherits:
Object
  • Object
show all
Extended by:
Deprecations
Defined in:
lib/aws-sdk-autoscaling/scaling_policy.rb

Defined Under Namespace

Classes: Collection

Read-Only Attributes collapse

Actions collapse

Associations collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, options = {}) ⇒ ScalingPolicy #initialize(options = {}) ⇒ ScalingPolicy

Returns a new instance of ScalingPolicy.

Overloads:

  • #initialize(name, options = {}) ⇒ ScalingPolicy

    Parameters:

    • name (String)

    Options Hash (options):

  • #initialize(options = {}) ⇒ ScalingPolicy

    Options Hash (options):

    • :name (required, String)
    • :client (Client) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 19

def initialize(*args)
  options = Hash === args.last ? args.pop.dup : {}
  @name = extract_name(args, options)
  @data = options.delete(:data)
  @client = options.delete(:client) || Client.new(options)
end

Instance Method Details

#adjustment_type ⇒ String

The adjustment type, which specifies how ‘ScalingAdjustment` is interpreted. Valid values are `ChangeInCapacity`, `ExactCapacity`, and `PercentChangeInCapacity`.

Returns:

  • (String) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 56

def adjustment_type
  data[:adjustment_type]
end

#alarms ⇒ Array<Types::Alarm>

The CloudWatch alarms related to the policy.

Returns:



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 114

def alarms
  data[:alarms]
end

#auto_scaling_group_name ⇒ String

The name of the Auto Scaling group.

Returns:

  • (String) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 36

def auto_scaling_group_name
  data[:auto_scaling_group_name]
end

#client ⇒ Client

Returns:



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 127

def client
  @client
end

#cooldown ⇒ Integer

The amount of time, in seconds, after a scaling activity completes before any further dynamic scaling activities can start.

Returns:

  • (Integer) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 87

def cooldown
  data[:cooldown]
end

#data ⇒ Types::ScalingPolicy

Returns the data for this Aws::AutoScaling::ScalingPolicy. Calls Client#describe_policies if #data_loaded? is ‘false`.

Returns:



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 147

def data
  load unless @data
  @data
end

#data_loaded? ⇒ Boolean

Returns ‘true` if this resource is loaded. Accessing attributes or #data on an unloaded resource will trigger a call to #load.

Returns:

  • (Boolean) —

    Returns ‘true` if this resource is loaded. Accessing attributes or #data on an unloaded resource will trigger a call to #load.



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 155

def data_loaded?
  !!@data
end

#delete(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


scaling_policy.delete({
  auto_scaling_group_name: "ResourceName",
})

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Options Hash (options):

  • :auto_scaling_group_name (String) —

    The name of the Auto Scaling group.

Returns:

  • (EmptyStructure) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 265

def delete(options = {})
  options = options.merge(policy_name: @name)
  resp = @client.delete_policy(options)
  resp.data
end

#estimated_instance_warmup ⇒ Integer

The estimated time, in seconds, until a newly launched instance can contribute to the CloudWatch metrics.

Returns:

  • (Integer) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 108

def estimated_instance_warmup
  data[:estimated_instance_warmup]
end

#execute(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


scaling_policy.execute({
  auto_scaling_group_name: "ResourceName",
  honor_cooldown: false,
  metric_value: 1.0,
  breach_threshold: 1.0,
})

Parameters:

  • options (Hash) (defaults to: {}) —

    ({})

Options Hash (options):

  • :auto_scaling_group_name (String) —

    The name of the Auto Scaling group.

  • :honor_cooldown (Boolean) —

    Indicates whether Amazon EC2 Auto Scaling waits for the cooldown period to complete before executing the policy.

    This parameter is not supported if the policy type is ‘StepScaling`.

    For more information, see [Scaling Cooldowns] in the *Amazon EC2 Auto Scaling User Guide*.

    [1]: docs.aws.amazon.com/autoscaling/ec2/userguide/Cooldown.html

  • :metric_value (Float) —

    The metric value to compare to ‘BreachThreshold`. This enables you to execute a policy of type `StepScaling` and determine which step adjustment to use. For example, if the breach threshold is 50 and you want to use a step adjustment with a lower bound of 0 and an upper bound of 10, you can set the metric value to 59.

    If you specify a metric value that doesn’t correspond to a step adjustment for the policy, the call returns an error.

    This parameter is required if the policy type is ‘StepScaling` and not supported otherwise.

  • :breach_threshold (Float) —

    The breach threshold for the alarm.

    This parameter is required if the policy type is ‘StepScaling` and not supported otherwise.

Returns:

  • (EmptyStructure) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 312

def execute(options = {})
  options = options.merge(policy_name: @name)
  resp = @client.execute_policy(options)
  resp.data
end

#group ⇒ AutoScalingGroup?

Returns:



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 321

def group
  if data[:auto_scaling_group_name]
    AutoScalingGroup.new(
      name: data[:auto_scaling_group_name],
      client: @client
    )
  else
    nil
  end
end

#identifiers ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Deprecated. 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 334

def identifiers
  { name: @name }
end

#load ⇒ self Also known as: reload

Loads, or reloads #data for the current Aws::AutoScaling::ScalingPolicy. Returns ‘self` making it possible to chain methods.

scaling_policy.reload.data

Returns:

  • (self) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 137

def load
  resp = @client.describe_policies(policy_names: [@name])
  @data = resp.scaling_policies[0]
  self
end

#metric_aggregation_type ⇒ String

The aggregation type for the CloudWatch metrics. Valid values are ‘Minimum`, `Maximum`, and `Average`.

Returns:

  • (String) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 101

def metric_aggregation_type
  data[:metric_aggregation_type]
end

#min_adjustment_magnitude ⇒ Integer

The minimum number of instances to scale. If the value of ‘AdjustmentType` is `PercentChangeInCapacity`, the scaling policy changes the `DesiredCapacity` of the Auto Scaling group by at least this many instances. Otherwise, the error is `ValidationError`.

Returns:

  • (Integer) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 72

def min_adjustment_magnitude
  data[:min_adjustment_magnitude]
end

#min_adjustment_step ⇒ Integer

Available for backward compatibility. Use ‘MinAdjustmentMagnitude` instead.

Returns:

  • (Integer) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 63

def min_adjustment_step
  data[:min_adjustment_step]
end

#name ⇒ String Also known as: policy_name

Returns:

  • (String) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 29

def name
  @name
end

#policy_arn ⇒ String

The Amazon Resource Name (ARN) of the policy.

Returns:

  • (String) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 42

def policy_arn
  data[:policy_arn]
end

#policy_type ⇒ String

The policy type. Valid values are ‘SimpleScaling` and `StepScaling`.

Returns:

  • (String) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 48

def policy_type
  data[:policy_type]
end

#scaling_adjustment ⇒ Integer

The amount by which to scale, based on the specified adjustment type. A positive value adds to the current capacity while a negative number removes from the current capacity.

Returns:

  • (Integer) 


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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 80

def scaling_adjustment
  data[:scaling_adjustment]
end

#step_adjustments ⇒ Array<Types::StepAdjustment>

A set of adjustments that enable you to scale based on the size of the alarm breach.

Returns:



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 94

def step_adjustments
  data[:step_adjustments]
end

#target_tracking_configuration ⇒ Types::TargetTrackingConfiguration

A target tracking policy.

Returns:



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 120

def target_tracking_configuration
  data[:target_tracking_configuration]
end

#wait_until(options = {}, &block) ⇒ Resource

Deprecated.

Use [Aws::AutoScaling::Client] #wait_until instead

Note:

The waiting operation is performed on a copy. The original resource remains unchanged

Waiter polls an API operation until a resource enters a desired state.

## Basic Usage

Waiter will polls until it is successful, it fails by entering a terminal state, or until a maximum number of attempts are made.

# polls in a loop until condition is true
resource.wait_until(options) {|resource| condition}

## Example

instance.wait_until(max_attempts:10, delay:5) {|instance| instance.state.name == 'running' }

## Configuration

You can configure the maximum number of polling attempts, and the delay (in seconds) between each polling attempt. The waiting condition is set by passing a block to #wait_until:

# poll for ~25 seconds
resource.wait_until(max_attempts:5,delay:5) {|resource|...}

## Callbacks

You can be notified before each polling attempt and before each delay. If you throw ‘:success` or `:failure` from these callbacks, it will terminate the waiter.

started_at = Time.now
# poll for 1 hour, instead of a number of attempts
proc = Proc.new do |attempts, response|
  throw :failure if Time.now - started_at > 3600
end

  # disable max attempts
instance.wait_until(before_wait:proc, max_attempts:nil) {...}

## Handling Errors

When a waiter is successful, it returns the Resource. When a waiter fails, it raises an error.

begin
  resource.wait_until(...)
rescue Aws::Waiters::Errors::WaiterFailed
  # resource did not enter the desired state in time
end

attempts attempt in seconds invoked before each attempt invoked before each wait

Parameters:

  • options (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (options):

  • :max_attempts (Integer) — default: 10 —

    Maximum number of

  • :delay (Integer) — default: 10 —

    Delay between each

  • :before_attempt (Proc) — default: nil —

    Callback

  • :before_wait (Proc) — default: nil —

    Callback

Returns:

  • (Resource) —

    if the waiter was successful

Raises:

  • (Aws::Waiters::Errors::FailureStateError) —

    Raised when the waiter terminates because the waiter has entered a state that it will not transition out of, preventing success.

    yet successful.

  • (Aws::Waiters::Errors::UnexpectedError) —

    Raised when an error is encountered while polling for a resource that is not expected.

  • (NotImplementedError) —

    Raised when the resource does not



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# File 'lib/aws-sdk-autoscaling/scaling_policy.rb', line 237

def wait_until(options = {}, &block)
  self_copy = self.dup
  attempts = 0
  options[:max_attempts] = 10 unless options.key?(:max_attempts)
  options[:delay] ||= 10
  options[:poller] = Proc.new do
    attempts += 1
    if block.call(self_copy)
      [:success, self_copy]
    else
      self_copy.reload unless attempts == options[:max_attempts]
      :retry
    end
  end
  Aws::Waiters::Waiter.new(options).wait({})
end