Class: Aws::CloudWatch::CompositeAlarm

Inherits:
Object
  • Object
show all
Defined in:
gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb

Defined Under Namespace

Classes: Collection

Read-Only Attributes collapse

Actions collapse

Instance Method Summary collapse

Constructor Details

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

Returns a new instance of CompositeAlarm.

Overloads:

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

    Parameters:

    • name (String)

    Options Hash (options):

  • #initialize(options = {}) ⇒ CompositeAlarm

    Options Hash (options):

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


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.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

#actions_enabledBoolean

Indicates whether actions should be executed during any changes to the alarm state.

Returns:

  • (Boolean)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 41

def actions_enabled
  data[:actions_enabled]
end

#alarm_actionsArray<String>

The actions to execute when this alarm transitions to the ALARM state from any other state. Each action is specified as an Amazon Resource Name (ARN).

Returns:

  • (Array<String>)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 49

def alarm_actions
  data[:alarm_actions]
end

#alarm_arnString

The Amazon Resource Name (ARN) of the alarm.

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 55

def alarm_arn
  data[:alarm_arn]
end

#alarm_configuration_updated_timestampTime

The time stamp of the last update to the alarm configuration.

Returns:

  • (Time)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 61

def alarm_configuration_updated_timestamp
  data[:alarm_configuration_updated_timestamp]
end

#alarm_descriptionString

The description of the alarm.

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 67

def alarm_description
  data[:alarm_description]
end

#alarm_ruleString

The rule that this alarm uses to evaluate its alarm state.

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 73

def alarm_rule
  data[:alarm_rule]
end

#clientClient

Returns:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 120

def client
  @client
end

#dataTypes::CompositeAlarm



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 140

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-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 148

def data_loaded?
  !!@data
end

#delete(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


composite_alarm.delete()

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 287

def delete(options = {})
  options = Aws::Util.deep_merge(options, alarm_names: [@name])
  resp = @client.delete_alarms(options)
  resp.data
end

#describe_history(options = {}) ⇒ Types::DescribeAlarmHistoryOutput

Examples:

Request syntax with placeholder values


composite_alarm.describe_history({
  alarm_types: ["CompositeAlarm"], # accepts CompositeAlarm, MetricAlarm
  history_item_type: "ConfigurationUpdate", # accepts ConfigurationUpdate, StateUpdate, Action
  start_date: Time.now,
  end_date: Time.now,
  max_records: 1,
  next_token: "NextToken",
  scan_by: "TimestampDescending", # accepts TimestampDescending, TimestampAscending
})

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Options Hash (options):

  • :alarm_types (Array<String>)

    Use this parameter to specify whether you want the operation to return metric alarms or composite alarms. If you omit this parameter, only metric alarms are returned.

  • :history_item_type (String)

    The type of alarm histories to retrieve.

  • :start_date (Time, DateTime, Date, Integer, String)

    The starting date to retrieve alarm history.

  • :end_date (Time, DateTime, Date, Integer, String)

    The ending date to retrieve alarm history.

  • :max_records (Integer)

    The maximum number of alarm history records to retrieve.

  • :next_token (String)

    The token returned by a previous call to indicate that there is more data available.

  • :scan_by (String)

    Specified whether to return the newest or oldest alarm history first. Specify TimestampDescending to have the newest event history returned first, and specify TimestampAscending to have the oldest history returned first.

Returns:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 326

def describe_history(options = {})
  options = options.merge(alarm_name: @name)
  resp = @client.describe_alarm_history(options)
  resp.data
end

#disable_actions(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


composite_alarm.disable_actions()

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 337

def disable_actions(options = {})
  options = Aws::Util.deep_merge(options, alarm_names: [@name])
  resp = @client.disable_alarm_actions(options)
  resp.data
end

#enable_actions(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


composite_alarm.enable_actions()

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 348

def enable_actions(options = {})
  options = Aws::Util.deep_merge(options, alarm_names: [@name])
  resp = @client.enable_alarm_actions(options)
  resp.data
end

#exists?(options = {}) ⇒ Boolean

Returns true if the CompositeAlarm exists.

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Returns:

  • (Boolean)

    Returns true if the CompositeAlarm exists.



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 155

def exists?(options = {})
  begin
    wait_until_exists(options.merge(max_attempts: 1))
    true
  rescue Aws::Waiters::Errors::UnexpectedError => e
    raise e.error
  rescue Aws::Waiters::Errors::WaiterFailed
    false
  end
end

#insufficient_data_actionsArray<String>

The actions to execute when this alarm transitions to the INSUFFICIENT_DATA state from any other state. Each action is specified as an Amazon Resource Name (ARN).

Returns:

  • (Array<String>)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 81

def insufficient_data_actions
  data[:insufficient_data_actions]
end

#loadself Also known as: reload

Loads, or reloads #data for the current Aws::CloudWatch::CompositeAlarm. Returns self making it possible to chain methods.

composite_alarm.reload.data

Returns:

  • (self)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 130

def load
  resp = @client.describe_alarms(alarm_names: [@name])
  @data = resp.composite_alarms[0]
  self
end

#nameString Also known as: alarm_name

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 33

def name
  @name
end

#ok_actionsArray<String>

The actions to execute when this alarm transitions to the OK state from any other state. Each action is specified as an Amazon Resource Name (ARN).

Returns:

  • (Array<String>)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 89

def ok_actions
  data[:ok_actions]
end

#set_state(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


composite_alarm.set_state({
  state_value: "OK", # required, accepts OK, ALARM, INSUFFICIENT_DATA
  state_reason: "StateReason", # required
  state_reason_data: "StateReasonData",
})

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Options Hash (options):

  • :state_value (required, String)

    The value of the state.

  • :state_reason (required, String)

    The reason that this alarm is set to this specific state, in text format.

  • :state_reason_data (String)

    The reason that this alarm is set to this specific state, in JSON format.

    For SNS or EC2 alarm actions, this is just informational. But for EC2 Auto Scaling or application Auto Scaling alarm actions, the Auto Scaling policy uses the information in this field to take the correct action.

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 376

def set_state(options = {})
  options = options.merge(alarm_name: @name)
  resp = @client.set_alarm_state(options)
  resp.data
end

#state_reasonString

An explanation for the alarm state, in text format.

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 95

def state_reason
  data[:state_reason]
end

#state_reason_dataString

An explanation for the alarm state, in JSON format.

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 101

def state_reason_data
  data[:state_reason_data]
end

#state_updated_timestampTime

The time stamp of the last update to the alarm state.

Returns:

  • (Time)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 107

def state_updated_timestamp
  data[:state_updated_timestamp]
end

#state_valueString

The state value for the alarm.

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 113

def state_value
  data[:state_value]
end

#wait_until(options = {}) {|resource| ... } ⇒ Resource

Deprecated.

Use [Aws::CloudWatch::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-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 263

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

#wait_until_exists(options = {}, &block) ⇒ CompositeAlarm

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Options Hash (options):

  • :max_attempts (Integer) — default: 40
  • :delay (Float) — default: 5
  • :before_attempt (Proc)
  • :before_wait (Proc)

Returns:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/composite_alarm.rb', line 172

def wait_until_exists(options = {}, &block)
  options, params = separate_params_and_options(options)
  waiter = Waiters::CompositeAlarmExists.new(options)
  yield_waiter_and_warn(waiter, &block) if block_given?
  waiter.wait(params.merge(alarm_names: [@name]))
  CompositeAlarm.new({
    name: @name,
    client: @client
  })
end