class CfnWaitCondition (construct)

Language	Type name
.NET	`Amazon.CDK.CfnWaitCondition`
Java	`software.amazon.awscdk.core.CfnWaitCondition`
Python	`aws_cdk.core.CfnWaitCondition`
TypeScript	`@aws-cdk/core` » `CfnWaitCondition`

Implements IConstruct, IConstruct, IDependable, IInspectable

A CloudFormation AWS::CloudFormation::WaitCondition.

For Amazon EC2 and Auto Scaling resources, we recommend that you use a CreationPolicy attribute instead of wait conditions. Add a CreationPolicy attribute to those resources, and use the cfn-signal helper script to signal when an instance creation process has completed successfully.

You can use a wait condition for situations like the following:

To coordinate stack resource creation with configuration actions that are external to the stack creation.
To track the status of a configuration process.

For these situations, we recommend that you associate a CreationPolicy attribute with the wait condition so that you don't have to use a wait condition handle. For more information and an example, see Creating wait conditions in a template . If you use a CreationPolicy with a wait condition, don't specify any of the wait condition's properties.

If you use the VPC endpoints feature, resources in the VPC that respond to wait conditions must have access to CloudFormation , specific Amazon Simple Storage Service ( Amazon S3 ) buckets. Resources must send wait condition responses to a presigned Amazon S3 URL. If they can't send responses to Amazon S3 , CloudFormation won't receive a response and the stack operation fails. For more information, see Setting up VPC endpoints for AWS CloudFormation .

Example

// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
import * as cdk from '@aws-cdk/core';
const cfnWaitCondition = new cdk.CfnWaitCondition(this, 'MyCfnWaitCondition', /* all optional props */ {
  count: 123,
  handle: 'handle',
  timeout: 'timeout',
});

Initializer

new CfnWaitCondition(scope: Construct, id: string, props?: CfnWaitConditionProps)

Parameters

scope Construct — - scope in which this resource is defined.
id string — - scoped id of the resource.
props CfnWaitConditionProps — - resource properties.

Create a new AWS::CloudFormation::WaitCondition.

Construct Props

Name	Type	Description
count?	`number`	The number of success signals that CloudFormation must receive before it continues the stack creation process.
handle?	`string`	A reference to the wait condition handle used to signal this wait condition.
timeout?	`string`	The length of time (in seconds) to wait for the number of signals that the `Count` property specifies.

count?

Type: number (optional)

The number of success signals that CloudFormation must receive before it continues the stack creation process.

When the wait condition receives the requisite number of success signals, CloudFormation resumes the creation of the stack. If the wait condition doesn't receive the specified number of success signals before the Timeout period expires, CloudFormation assumes that the wait condition has failed and rolls the stack back.

Updates aren't supported.

handle?

Type: string (optional)

A reference to the wait condition handle used to signal this wait condition.

Use the Ref intrinsic function to specify an AWS::CloudFormation::WaitConditionHandle resource.

Anytime you add a WaitCondition resource during a stack update, you must associate the wait condition with a new WaitConditionHandle resource. Don't reuse an old wait condition handle that has already been defined in the template. If you reuse a wait condition handle, the wait condition might evaluate old signals from a previous create or update stack command.

Updates aren't supported.

timeout?

Type: string (optional)

The length of time (in seconds) to wait for the number of signals that the Count property specifies.

Timeout is a minimum-bound property, meaning the timeout occurs no sooner than the time you specify, but can occur shortly thereafter. The maximum time that can be specified for this property is 12 hours (43200 seconds).

Updates aren't supported.

Properties

Name	Type	Description
attrData	`IResolvable`	A JSON object that contains the `UniqueId` and `Data` values from the wait condition signal(s) for the specified wait condition.
cfnOptions	`ICfnResourceOptions`	Options for this resource, such as condition, update policy etc.
cfnProperties	`{ [string]: any }`
cfnResourceType	`string`	AWS resource type.
creationStack	`string[]`
logicalId	`string`	The logical ID for this CloudFormation stack element.
node	`ConstructNode`	The construct tree node associated with this construct.
ref	`string`	Return a string that will be resolved to a CloudFormation `{ Ref }` for this element.
stack	`Stack`	The stack in which this element is defined.
count?	`number`	The number of success signals that CloudFormation must receive before it continues the stack creation process.
handle?	`string`	A reference to the wait condition handle used to signal this wait condition.
timeout?	`string`	The length of time (in seconds) to wait for the number of signals that the `Count` property specifies.
static CFN_RESOURCE_TYPE_NAME	`string`	The CloudFormation resource type name for this resource class.

attrData

Type: IResolvable

A JSON object that contains the UniqueId and Data values from the wait condition signal(s) for the specified wait condition.

For more information about wait condition signals, see Wait condition signal JSON format .

Example return value for a wait condition with 2 signals:

{ "Signal1" : "Step 1 complete." , "Signal2" : "Step 2 complete." }

cfnOptions

Type: ICfnResourceOptions

Options for this resource, such as condition, update policy etc.

cfnProperties

Type: { [string]: any }

cfnResourceType

Type: string

AWS resource type.

creationStack

Type: string[]

logicalId

Type: string

The logical ID for this CloudFormation stack element.

The logical ID of the element is calculated from the path of the resource node in the construct tree.

To override this value, use overrideLogicalId(newLogicalId).

node

Type: ConstructNode

The construct tree node associated with this construct.

ref

Type: string

Return a string that will be resolved to a CloudFormation { Ref } for this element.

If, by any chance, the intrinsic reference of a resource is not a string, you could coerce it to an IResolvable through Lazy.any({ produce: resource.ref }).

stack

Type: Stack

The stack in which this element is defined.

CfnElements must be defined within a stack scope (directly or indirectly).

count?

Type: number (optional)

The number of success signals that CloudFormation must receive before it continues the stack creation process.

Updates aren't supported.

handle?

Type: string (optional)

A reference to the wait condition handle used to signal this wait condition.

Use the Ref intrinsic function to specify an AWS::CloudFormation::WaitConditionHandle resource.

Updates aren't supported.

timeout?

Type: string (optional)

The length of time (in seconds) to wait for the number of signals that the Count property specifies.

Updates aren't supported.

static CFN_RESOURCE_TYPE_NAME

Type: string

The CloudFormation resource type name for this resource class.

Methods

Name	Description
addDeletionOverride(path)	Syntactic sugar for `addOverride(path, undefined)`.
addDependsOn(target)	Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.
addMetadata(key, value)	Add a value to the CloudFormation Resource Metadata.
addOverride(path, value)	Adds an override to the synthesized CloudFormation resource.
addPropertyDeletionOverride(propertyPath)	Adds an override that deletes the value of a property from the resource definition.
addPropertyOverride(propertyPath, value)	Adds an override to a resource property.
applyRemovalPolicy(policy?, options?)	Sets the deletion policy of the resource based on the removal policy specified.
getAtt(attributeName)	Returns a token for an runtime attribute of this resource.
getMetadata(key)	Retrieve a value value from the CloudFormation Resource Metadata.
inspect(inspector)	Examines the CloudFormation resource and discloses attributes.
overrideLogicalId(newLogicalId)	Overrides the auto-generated logical ID with a specific ID.
toString()	Returns a string representation of this construct.
protected renderProperties(props)

addDeletionOverride(path)

public addDeletionOverride(path: string): void

Parameters

path string — The path of the value to delete.

Syntactic sugar for addOverride(path, undefined).

addDependsOn(target)

public addDependsOn(target: CfnResource): void

Parameters

target CfnResource

Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.

This can be used for resources across stacks (or nested stack) boundaries and the dependency will automatically be transferred to the relevant scope.

addMetadata(key, value)

public addMetadata(key: string, value: any): void

Parameters

key string
value any

Add a value to the CloudFormation Resource Metadata.

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/metadata-section-structure.html

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.)

addOverride(path, value)

public addOverride(path: string, value: any): void

Parameters

path string — - The path of the property, you can use dot notation to override values in complex types.
value any — - The value.

Adds an override to the synthesized CloudFormation resource.

To add a property override, either use addPropertyOverride or prefix path with "Properties." (i.e. Properties.TopicName).

If the override is nested, separate each nested level using a dot (.) in the path parameter. If there is an array as part of the nesting, specify the index in the path.

To include a literal . in the property name, prefix with a \. In most programming languages you will need to write this as "\\." because the \ itself will need to be escaped.

For example,

cfnResource.addOverride('Properties.GlobalSecondaryIndexes.0.Projection.NonKeyAttributes', ['myattribute']);
cfnResource.addOverride('Properties.GlobalSecondaryIndexes.1.ProjectionType', 'INCLUDE');

would add the overrides

"Properties": {
   "GlobalSecondaryIndexes": [
     {
       "Projection": {
         "NonKeyAttributes": [ "myattribute" ]
         ...
       }
       ...
     },
     {
       "ProjectionType": "INCLUDE"
       ...
     },
   ]
   ...
}

The value argument to addOverride will not be processed or translated in any way. Pass raw JSON values in here with the correct capitalization for CloudFormation. If you pass CDK classes or structs, they will be rendered with lowercased key names, and CloudFormation will reject the template.

addPropertyDeletionOverride(propertyPath)

public addPropertyDeletionOverride(propertyPath: string): void

Parameters

propertyPath string — The path to the property.

Adds an override that deletes the value of a property from the resource definition.

addPropertyOverride(propertyPath, value)

public addPropertyOverride(propertyPath: string, value: any): void

Parameters

propertyPath string — The path of the property.
value any — The value.

Adds an override to a resource property.

Syntactic sugar for addOverride("Properties.<...>", value).

applyRemovalPolicy(policy?, options?)

public applyRemovalPolicy(policy?: RemovalPolicy, options?: RemovalPolicyOptions): void

Parameters

policy RemovalPolicy
options RemovalPolicyOptions

Sets the deletion policy of the resource based on the removal policy specified.

The Removal Policy controls what happens to this resource when it stops being managed by CloudFormation, either because you've removed it from the CDK application or because you've made a change that requires the resource to be replaced.

The resource can be deleted (RemovalPolicy.DESTROY), or left in your AWS account for data recovery and cleanup later (RemovalPolicy.RETAIN).

getAtt(attributeName)

public getAtt(attributeName: string): Reference

Parameters

attributeName string — The name of the attribute.

Returns

Reference

Returns a token for an runtime attribute of this resource.

Ideally, use generated attribute accessors (e.g. resource.arn), but this can be used for future compatibility in case there is no generated attribute.

getMetadata(key)

public getMetadata(key: string): any

Parameters

key string

Returns

any

Retrieve a value value from the CloudFormation Resource Metadata.

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.)

inspect(inspector)

public inspect(inspector: TreeInspector): void

Parameters

inspector TreeInspector — - tree inspector to collect and process attributes.

Examines the CloudFormation resource and discloses attributes.

overrideLogicalId(newLogicalId)

public overrideLogicalId(newLogicalId: string): void

Parameters

newLogicalId string — The new logical ID to use for this stack element.

Overrides the auto-generated logical ID with a specific ID.

toString()

public toString(): string

Returns

string

Returns a string representation of this construct.

protected renderProperties(props)

protected renderProperties(props: { [string]: any }): { [string]: any }

Parameters

props { [string]: any }

Returns

{ [string]: any }