package awscdk


// To specify how AWS CloudFormation handles rolling updates for an Auto Scaling group, use the AutoScalingRollingUpdate policy.
//
// Rolling updates enable you to specify whether AWS CloudFormation updates instances that are in an Auto Scaling
// group in batches or all at once.
//
// Example:
//   // The code below shows an example of how to instantiate this type.
//   // The values are placeholders you should change.
//   import cdk "github.com/aws/aws-cdk-go/awscdk"
//
//   cfnAutoScalingRollingUpdate := &CfnAutoScalingRollingUpdate{
//   	MaxBatchSize: jsii.Number(123),
//   	MinInstancesInService: jsii.Number(123),
//   	MinSuccessfulInstancesPercent: jsii.Number(123),
//   	PauseTime: jsii.String("pauseTime"),
//   	SuspendProcesses: []*string{
//   		jsii.String("suspendProcesses"),
//   	},
//   	WaitOnResourceSignals: jsii.Boolean(false),
//   }
//
type CfnAutoScalingRollingUpdate struct {
	// Specifies the maximum number of instances that AWS CloudFormation updates.
	MaxBatchSize *float64 `field:"optional" json:"maxBatchSize" yaml:"maxBatchSize"`
	// Specifies the minimum number of instances that must be in service within the Auto Scaling group while AWS CloudFormation updates old instances.
	MinInstancesInService *float64 `field:"optional" json:"minInstancesInService" yaml:"minInstancesInService"`
	// Specifies the percentage of instances in an Auto Scaling rolling update that must signal success for an update to succeed.
	//
	// You can specify a value from 0 to 100. AWS CloudFormation rounds to the nearest tenth of a percent. For example, if you
	// update five instances with a minimum successful percentage of 50, three instances must signal success.
	//
	// If an instance doesn't send a signal within the time specified in the PauseTime property, AWS CloudFormation assumes
	// that the instance wasn't updated.
	//
	// If you specify this property, you must also enable the WaitOnResourceSignals and PauseTime properties.
	MinSuccessfulInstancesPercent *float64 `field:"optional" json:"minSuccessfulInstancesPercent" yaml:"minSuccessfulInstancesPercent"`
	// The amount of time that AWS CloudFormation pauses after making a change to a batch of instances to give those instances time to start software applications.
	//
	// For example, you might need to specify PauseTime when scaling up the number of
	// instances in an Auto Scaling group.
	//
	// If you enable the WaitOnResourceSignals property, PauseTime is the amount of time that AWS CloudFormation should wait
	// for the Auto Scaling group to receive the required number of valid signals from added or replaced instances. If the
	// PauseTime is exceeded before the Auto Scaling group receives the required number of signals, the update fails. For best
	// results, specify a time period that gives your applications sufficient time to get started. If the update needs to be
	// rolled back, a short PauseTime can cause the rollback to fail.
	//
	// Specify PauseTime in the ISO8601 duration format (in the format PT#H#M#S, where each # is the number of hours, minutes,
	// and seconds, respectively). The maximum PauseTime is one hour (PT1H).
	PauseTime *string `field:"optional" json:"pauseTime" yaml:"pauseTime"`
	// Specifies the Auto Scaling processes to suspend during a stack update.
	//
	// Suspending processes prevents Auto Scaling from
	// interfering with a stack update. For example, you can suspend alarming so that Auto Scaling doesn't execute scaling
	// policies associated with an alarm. For valid values, see the ScalingProcesses.member.N parameter for the SuspendProcesses
	// action in the Auto Scaling API Reference.
	SuspendProcesses *[]*string `field:"optional" json:"suspendProcesses" yaml:"suspendProcesses"`
	// Specifies whether the Auto Scaling group waits on signals from new instances during an update.
	//
	// Use this property to
	// ensure that instances have completed installing and configuring applications before the Auto Scaling group update proceeds.
	// AWS CloudFormation suspends the update of an Auto Scaling group after new EC2 instances are launched into the group.
	// AWS CloudFormation must receive a signal from each new instance within the specified PauseTime before continuing the update.
	// To signal the Auto Scaling group, use the cfn-signal helper script or SignalResource API.
	//
	// To have instances wait for an Elastic Load Balancing health check before they signal success, add a health-check
	// verification by using the cfn-init helper script. For an example, see the verify_instance_health command in the Auto Scaling
	// rolling updates sample template.
	WaitOnResourceSignals *bool `field:"optional" json:"waitOnResourceSignals" yaml:"waitOnResourceSignals"`
}