Class: Aws::AutoScaling::ScalingPolicy

Inherits:
Object
  • Object
show all
Defined in:
gems/aws-sdk-autoscaling/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 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 22

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)
  @waiter_block_warned = false
end

Instance Method Details

#adjustment_typeString

Specifies how the scaling adjustment is interpreted (for example, an absolute number or a percentage). The valid values are ChangeInCapacity, ExactCapacity, and PercentChangeInCapacity.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 77

def adjustment_type
  data[:adjustment_type]
end

#alarmsArray<Types::Alarm>

The CloudWatch alarms related to the policy.

Returns:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 132

def alarms
  data[:alarms]
end

#auto_scaling_group_nameString

The name of the Auto Scaling group.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 40

def auto_scaling_group_name
  data[:auto_scaling_group_name]
end

#clientClient

Returns:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 158

def client
  @client
end

#cooldownInteger

The duration of the policy's cooldown period, in seconds.

Returns:

  • (Integer)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 105

def cooldown
  data[:cooldown]
end

#dataTypes::ScalingPolicy

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

Returns:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 178

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 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 186

def data_loaded?
  !!@data
end

#delete(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


scaling_policy.delete({
  auto_scaling_group_name: "XmlStringMaxLen255",
})

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 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 298

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

#enabledBoolean

Indicates whether the policy is enabled (true) or disabled (false).

Returns:

  • (Boolean)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 145

def enabled
  data[:enabled]
end

#estimated_instance_warmupInteger

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

Returns:

  • (Integer)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 126

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: "XmlStringMaxLen255",
  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.

    Valid only if the policy type is SimpleScaling. For more information, see Scaling cooldowns for Amazon EC2 Auto Scaling in the Amazon EC2 Auto Scaling User Guide.

  • :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.

    Required if the policy type is StepScaling and not supported otherwise.

  • :breach_threshold (Float)

    The breach threshold for the alarm.

    Required if the policy type is StepScaling and not supported otherwise.

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 344

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

#groupAutoScalingGroup?

Returns:



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 353

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

#loadself 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 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 168

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

#metric_aggregation_typeString

The aggregation type for the CloudWatch metrics. The valid values are Minimum, Maximum, and Average.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 119

def metric_aggregation_type
  data[:metric_aggregation_type]
end

#min_adjustment_magnitudeInteger

The minimum value to scale by when the adjustment type is PercentChangeInCapacity.

Returns:

  • (Integer)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 91

def min_adjustment_magnitude
  data[:min_adjustment_magnitude]
end

#min_adjustment_stepInteger

Available for backward compatibility. Use MinAdjustmentMagnitude instead.

Returns:

  • (Integer)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 84

def min_adjustment_step
  data[:min_adjustment_step]
end

#nameString Also known as: policy_name

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 33

def name
  @name
end

#policy_arnString

The Amazon Resource Name (ARN) of the policy.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 46

def policy_arn
  data[:policy_arn]
end

#policy_typeString

One of the following policy types:

  • TargetTrackingScaling

  • StepScaling

  • SimpleScaling (default)

  • PredictiveScaling

For more information, see Target tracking scaling policies and Step and simple scaling policies in the Amazon EC2 Auto Scaling User Guide.

Returns:

  • (String)


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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 69

def policy_type
  data[:policy_type]
end

#predictive_scaling_configurationTypes::PredictiveScalingConfiguration

A predictive scaling policy.



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 151

def predictive_scaling_configuration
  data[:predictive_scaling_configuration]
end

#scaling_adjustmentInteger

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 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 99

def scaling_adjustment
  data[:scaling_adjustment]
end

#step_adjustmentsArray<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 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 112

def step_adjustments
  data[:step_adjustments]
end

#target_tracking_configurationTypes::TargetTrackingConfiguration

A target tracking scaling policy.



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# File 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 138

def target_tracking_configuration
  data[:target_tracking_configuration]
end

#wait_until(options = {}) {|resource| ... } ⇒ 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) do |instance|
  instance.state.name == 'running'
end

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

Yield Parameters:

  • resource (Resource)

    to be used in the waiting condition.

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 'gems/aws-sdk-autoscaling/lib/aws-sdk-autoscaling/scaling_policy.rb', line 270

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