com.amazonaws.services.applicationautoscaling

Interface AWSApplicationAutoScaling

All Known Subinterfaces:

AWSApplicationAutoScalingAsync

All Known Implementing Classes:

AbstractAWSApplicationAutoScaling, AbstractAWSApplicationAutoScalingAsync, AWSApplicationAutoScalingAsyncClient, AWSApplicationAutoScalingClient

public interface AWSApplicationAutoScaling

Interface for accessing Application Auto Scaling.

Application Auto Scaling is a general purpose Auto Scaling service for supported elastic AWS resources. With Application Auto Scaling, you can automatically scale your AWS resources, with an experience similar to that of Auto Scaling.

At this time, Application Auto Scaling only supports scaling Amazon ECS services.

For example, you can use Application Auto Scaling to accomplish the following tasks:

• Define scaling policies for automatically adjusting your application’s resources

• Scale your resources in response to CloudWatch alarms

• View history of your scaling events

Application Auto Scaling is available in the following regions:

• us-east-1

• us-west-2

• eu-west-1

Field Summary

Fields

Modifier and Type	Field and Description
static String	ENDPOINT_PREFIX The region metadata service name for computing region endpoints.

Method Summary

Methods

Modifier and Type	Method and Description
DeleteScalingPolicyResult	deleteScalingPolicy(DeleteScalingPolicyRequest deleteScalingPolicyRequest) Deletes an Application Auto Scaling scaling policy that was previously created.
DeregisterScalableTargetResult	deregisterScalableTarget(DeregisterScalableTargetRequest deregisterScalableTargetRequest) Deregisters a scalable target that was previously registered.
DescribeScalableTargetsResult	describeScalableTargets(DescribeScalableTargetsRequest describeScalableTargetsRequest) Provides descriptive information for scalable targets with a specified service namespace.
DescribeScalingActivitiesResult	describeScalingActivities(DescribeScalingActivitiesRequest describeScalingActivitiesRequest) Provides descriptive information for scaling activities with a specified service namespace.
DescribeScalingPoliciesResult	describeScalingPolicies(DescribeScalingPoliciesRequest describeScalingPoliciesRequest) Provides descriptive information for scaling policies with a specified service namespace.
ResponseMetadata	getCachedResponseMetadata(AmazonWebServiceRequest request) Returns additional metadata for a previously executed successful request, typically used for debugging issues where a service isn't acting as expected.
PutScalingPolicyResult	putScalingPolicy(PutScalingPolicyRequest putScalingPolicyRequest) Creates or updates a policy for an existing Application Auto Scaling scalable target.
RegisterScalableTargetResult	registerScalableTarget(RegisterScalableTargetRequest registerScalableTargetRequest) Registers or updates a scalable target.
void	setEndpoint(String endpoint) Overrides the default endpoint for this client ("https://autoscaling.us-east-1.amazonaws.com").
void	setRegion(Region region) An alternative to setEndpoint(String), sets the regional endpoint for this client's service calls.
void	shutdown() Shuts down this client object, releasing any resources that might be held open.

Field Detail

ENDPOINT_PREFIX

static final String ENDPOINT_PREFIX

The region metadata service name for computing region endpoints. You can use this value to retrieve metadata (such as supported regions) of the service.

See Also:

RegionUtils.getRegionsForService(String), Constant Field Values

Method Detail

setEndpoint

void setEndpoint(String endpoint)

Overrides the default endpoint for this client ("https://autoscaling.us-east-1.amazonaws.com"). Callers can use this method to control which AWS region they want to work with.

Callers can pass in just the endpoint (ex: "autoscaling.us-east-1.amazonaws.com") or a full URL, including the protocol (ex: "https://autoscaling.us-east-1.amazonaws.com"). If the protocol is not specified here, the default protocol from this client's ClientConfiguration will be used, which by default is HTTPS.

For more information on using AWS regions with the AWS SDK for Java, and a complete list of all available endpoints for all AWS services, see: http://developer.amazonwebservices.com/connect/entry.jspa?externalID= 3912

This method is not threadsafe. An endpoint should be configured when the client is created and before any service requests are made. Changing it afterwards creates inevitable race conditions for any service requests in transit or retrying.

Parameters:

endpoint - The endpoint (ex: "autoscaling.us-east-1.amazonaws.com") or a full URL, including the protocol (ex: "https://autoscaling.us-east-1.amazonaws.com") of the region specific AWS endpoint this client will communicate with.

setRegion

void setRegion(Region region)

An alternative to setEndpoint(String), sets the regional endpoint for this client's service calls. Callers can use this method to control which AWS region they want to work with.

By default, all service endpoints in all regions use the https protocol. To use http instead, specify it in the ClientConfiguration supplied at construction.

This method is not threadsafe. A region should be configured when the client is created and before any service requests are made. Changing it afterwards creates inevitable race conditions for any service requests in transit or retrying.

Parameters:

region - The region this client will communicate with. See Region.getRegion(com.amazonaws.regions.Regions) for accessing a given region. Must not be null and must be a region where the service is available.

See Also:

Region.getRegion(com.amazonaws.regions.Regions), Region.createClient(Class, com.amazonaws.auth.AWSCredentialsProvider, ClientConfiguration), Region.isServiceSupported(String)

deleteScalingPolicy

DeleteScalingPolicyResult deleteScalingPolicy(DeleteScalingPolicyRequest deleteScalingPolicyRequest)

Deletes an Application Auto Scaling scaling policy that was previously created. If you are no longer using a scaling policy, you can delete it with this operation.

Deleting a policy deletes the underlying alarm action, but does not delete the CloudWatch alarm, even if it no longer has an associated action.

To create a new scaling policy or update an existing one, see PutScalingPolicy.

Parameters:

deleteScalingPolicyRequest -

Returns:

Result of the DeleteScalingPolicy operation returned by the service.

Throws:

ValidationException - An exception was thrown for a validation issue. Review the available parameters for the API request.

ObjectNotFoundException - The specified object could not be found. For any Put or Register API operation, which depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any Delete or Deregister API operation, this exception is thrown if the resource that is to be deleted or deregistered cannot be found.

ConcurrentUpdateException - Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

InternalServiceException - The service encountered an internal error.

deregisterScalableTarget

DeregisterScalableTargetResult deregisterScalableTarget(DeregisterScalableTargetRequest deregisterScalableTargetRequest)

Deregisters a scalable target that was previously registered. If you are no longer using a scalable target, you can delete it with this operation. When you deregister a scalable target, all of the scaling policies that are associated with that scalable target are deleted.

To create a new scalable target or update an existing one, see RegisterScalableTarget.

Parameters:

deregisterScalableTargetRequest -

Returns:

Result of the DeregisterScalableTarget operation returned by the service.

Throws:

ValidationException - An exception was thrown for a validation issue. Review the available parameters for the API request.

ObjectNotFoundException - The specified object could not be found. For any Put or Register API operation, which depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any Delete or Deregister API operation, this exception is thrown if the resource that is to be deleted or deregistered cannot be found.

ConcurrentUpdateException - Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

InternalServiceException - The service encountered an internal error.

describeScalableTargets

DescribeScalableTargetsResult describeScalableTargets(DescribeScalableTargetsRequest describeScalableTargetsRequest)

Provides descriptive information for scalable targets with a specified service namespace.

You can filter the results in a service namespace with the ResourceIds and ScalableDimension parameters.

To create a new scalable target or update an existing one, see RegisterScalableTarget. If you are no longer using a scalable target, you can deregister it with DeregisterScalableTarget.

Parameters:

describeScalableTargetsRequest -

Returns:

Result of the DescribeScalableTargets operation returned by the service.

Throws:

ValidationException - An exception was thrown for a validation issue. Review the available parameters for the API request.

InvalidNextTokenException - The next token supplied was invalid.

ConcurrentUpdateException - Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

InternalServiceException - The service encountered an internal error.

describeScalingActivities

DescribeScalingActivitiesResult describeScalingActivities(DescribeScalingActivitiesRequest describeScalingActivitiesRequest)

Provides descriptive information for scaling activities with a specified service namespace.

You can filter the results in a service namespace with the ResourceId and ScalableDimension parameters.

Scaling activities are triggered by CloudWatch alarms that are associated with scaling policies. To view the existing scaling policies for a service namespace, see DescribeScalingPolicies. To create a new scaling policy or update an existing one, see PutScalingPolicy.

Parameters:

describeScalingActivitiesRequest -

Returns:

Result of the DescribeScalingActivities operation returned by the service.

Throws:

ValidationException - An exception was thrown for a validation issue. Review the available parameters for the API request.

InvalidNextTokenException - The next token supplied was invalid.

ConcurrentUpdateException - Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

InternalServiceException - The service encountered an internal error.

describeScalingPolicies

DescribeScalingPoliciesResult describeScalingPolicies(DescribeScalingPoliciesRequest describeScalingPoliciesRequest)

Provides descriptive information for scaling policies with a specified service namespace.

You can filter the results in a service namespace with the ResourceId, ScalableDimension, and PolicyNames parameters.

To create a new scaling policy or update an existing one, see PutScalingPolicy. If you are no longer using a scaling policy, you can delete it with DeleteScalingPolicy.

Parameters:

describeScalingPoliciesRequest -

Returns:

Result of the DescribeScalingPolicies operation returned by the service.

Throws:

ValidationException - An exception was thrown for a validation issue. Review the available parameters for the API request.

FailedResourceAccessException - Failed access to resources caused an exception. This exception currently only applies to DescribeScalingPolicies. It is thrown when Application Auto Scaling is unable to retrieve the alarms associated with a scaling policy due to a client error, for example, if the role ARN specified for a scalable target does not have the proper permissions to call the CloudWatch DescribeAlarms API operation on behalf of your account.

InvalidNextTokenException - The next token supplied was invalid.

ConcurrentUpdateException - Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

InternalServiceException - The service encountered an internal error.

putScalingPolicy

PutScalingPolicyResult putScalingPolicy(PutScalingPolicyRequest putScalingPolicyRequest)

Creates or updates a policy for an existing Application Auto Scaling scalable target. Each scalable target is identified by service namespace, a resource ID, and a scalable dimension, and a scaling policy applies to a scalable target that is identified by those three attributes. You cannot create a scaling policy without first registering a scalable target with RegisterScalableTarget.

To update an existing policy, use the existing policy name and set the parameters you want to change. Any existing parameter not changed in an update to an existing policy is not changed in this update request.

You can view the existing scaling policies for a service namespace with DescribeScalingPolicies. If you are no longer using a scaling policy, you can delete it with DeleteScalingPolicy.

Parameters:

putScalingPolicyRequest -

Returns:

Result of the PutScalingPolicy operation returned by the service.

Throws:

ValidationException - An exception was thrown for a validation issue. Review the available parameters for the API request.

LimitExceededException - Your account exceeded a limit. This exception is thrown when a per-account resource limit is exceeded. Application Auto Scaling has a limit of 40 scalable targets per account for Amazon ECS services, 50 scaling policies per scalable target, and 20 step adjustments per step scaling policy.

ObjectNotFoundException - The specified object could not be found. For any Put or Register API operation, which depends on the existence of a scalable target, this exception is thrown if the scalable target with the specified service namespace, resource ID, and scalable dimension does not exist. For any Delete or Deregister API operation, this exception is thrown if the resource that is to be deleted or deregistered cannot be found.

ConcurrentUpdateException - Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

InternalServiceException - The service encountered an internal error.

registerScalableTarget

RegisterScalableTargetResult registerScalableTarget(RegisterScalableTargetRequest registerScalableTargetRequest)

Registers or updates a scalable target. A scalable target is a resource that can be scaled up or down with Application Auto Scaling. After you have registered a scalable target, you can use this command to update the minimum and maximum values for your scalable dimension.

At this time, Application Auto Scaling only supports scaling Amazon ECS services.

After you register a scalable target with Application Auto Scaling, you can create and apply scaling policies to it with PutScalingPolicy. You can view the existing scaling policies for a service namespace with DescribeScalableTargets. If you are no longer using a scalable target, you can deregister it with DeregisterScalableTarget.

Parameters:

registerScalableTargetRequest -

Returns:

Result of the RegisterScalableTarget operation returned by the service.

Throws:

ValidationException - An exception was thrown for a validation issue. Review the available parameters for the API request.

LimitExceededException - Your account exceeded a limit. This exception is thrown when a per-account resource limit is exceeded. Application Auto Scaling has a limit of 40 scalable targets per account for Amazon ECS services, 50 scaling policies per scalable target, and 20 step adjustments per step scaling policy.

ConcurrentUpdateException - Concurrent updates caused an exception, for example, if you request an update to an Application Auto Scaling resource that already has a pending update.

InternalServiceException - The service encountered an internal error.

shutdown

void shutdown()

Shuts down this client object, releasing any resources that might be held open. This is an optional method, and callers are not expected to call it, but can if they want to explicitly release any open resources. Once a client has been shutdown, it should not be used to make any more requests.

getCachedResponseMetadata

ResponseMetadata getCachedResponseMetadata(AmazonWebServiceRequest request)

Returns additional metadata for a previously executed successful request, typically used for debugging issues where a service isn't acting as expected. This data isn't considered part of the result data returned by an operation, so it's available through this separate, diagnostic interface.

Response metadata is only cached for a limited period of time, so if you need to access this extra diagnostic information for an executed request, you should use this method to retrieve it as soon as possible after executing a request.

Parameters:

request - The originally executed request.

Returns:

The response metadata for the specified request, or null if none is available.