class aws_cdk.aws_ecs_patterns.QueueProcessingServiceBase(scope, id, *, image, cluster=None, command=None, desired_task_count=None, enable_ecs_managed_tags=None, enable_logging=None, environment=None, family=None, log_driver=None, max_healthy_percent=None, max_receive_count=None, max_scaling_capacity=None, min_healthy_percent=None, propagate_tags=None, queue=None, retention_period=None, scaling_steps=None, secrets=None, service_name=None, vpc=None)

Bases: aws_cdk.core.Construct

The base class for QueueProcessingEc2Service and QueueProcessingFargateService services.

Constructs a new instance of the QueueProcessingServiceBase class.

  • scope (Construct) –

  • id (str) –

  • image (ContainerImage) – The image used to start a container.

  • cluster (Optional[ICluster]) – The name of the cluster that hosts the service. If a cluster is specified, the vpc construct should be omitted. Alternatively, you can omit both cluster and vpc. Default: - create a new cluster; if both cluster and vpc are omitted, a new VPC will be created for you.

  • command (Optional[List[str]]) – The command that is passed to the container. If you provide a shell command as a single string, you have to quote command-line arguments. Default: - CMD value built into container image.

  • desired_task_count (Union[int, float, None]) – The desired number of instantiations of the task definition to keep running on the service. Default: 1

  • enable_ecs_managed_tags (Optional[bool]) – Specifies whether to enable Amazon ECS managed tags for the tasks within the service. For more information, see Tagging Your Amazon ECS Resources Default: false

  • enable_logging (Optional[bool]) – Flag to indicate whether to enable logging. Default: true

  • environment (Optional[Mapping[str, str]]) – The environment variables to pass to the container. The variable QUEUE_NAME with value queue.queueName will always be passed. Default: ‘QUEUE_NAME: queue.queueName’

  • family (Optional[str]) – The name of a family that the task definition is registered to. A family groups multiple versions of a task definition. Default: - Automatically generated name.

  • log_driver (Optional[LogDriver]) – The log driver to use. Default: - AwsLogDriver if enableLogging is true

  • max_healthy_percent (Union[int, float, None]) – The maximum number of tasks, specified as a percentage of the Amazon ECS service’s DesiredCount value, that can run in a service during a deployment. Default: - default from underlying service.

  • max_receive_count (Union[int, float, None]) – The maximum number of times that a message can be received by consumers. When this value is exceeded for a message the message will be automatically sent to the Dead Letter Queue. Default: 3

  • max_scaling_capacity (Union[int, float, None]) – Maximum capacity to scale to. Default: (desiredTaskCount * 2)

  • min_healthy_percent (Union[int, float, None]) – The minimum number of tasks, specified as a percentage of the Amazon ECS service’s DesiredCount value, that must continue to run and remain healthy during a deployment. Default: - default from underlying service.

  • propagate_tags (Optional[PropagatedTagSource]) – Specifies whether to propagate the tags from the task definition or the service to the tasks in the service. Tags can only be propagated to the tasks within the service during service creation. Default: - none

  • queue (Optional[IQueue]) – A queue for which to process items from. If specified and this is a FIFO queue, the queue name must end in the string ‘.fifo’. See CreateQueue Default: ‘SQSQueue with CloudFormation-generated name’

  • retention_period (Optional[Duration]) – The number of seconds that Dead Letter Queue retains a message. Default: Duration.days(14)

  • scaling_steps (Optional[List[ScalingInterval]]) – The intervals for scaling based on the SQS queue’s ApproximateNumberOfMessagesVisible metric. Maps a range of metric values to a particular scaling behavior. See Simple and Step Scaling Policies for Amazon EC2 Auto Scaling Default: [{ upper: 0, change: -1 },{ lower: 100, change: +1 },{ lower: 500, change: +5 }]

  • secrets (Optional[Mapping[str, Secret]]) – The secret to expose to the container as an environment variable. Default: - No secret environment variables.

  • service_name (Optional[str]) – The name of the service. Default: - CloudFormation-generated name.

  • vpc (Optional[IVpc]) – The VPC where the container instances will be launched or the elastic network interfaces (ENIs) will be deployed. If a vpc is specified, the cluster construct should be omitted. Alternatively, you can omit both vpc and cluster. Default: - uses the VPC defined in the cluster or creates a new VPC.



Returns a string representation of this construct.

Return type




The cluster where your service will be deployed.

Return type



The dead letter queue for the primary SQS queue.

Return type



The minimum number of tasks to run.

Return type

Union[int, float]


Environment variables that will include the queue name.

Return type

Mapping[str, str]


The AwsLogDriver to use for logging if logging is enabled.

Return type



The maximum number of instances for autoscaling to scale up to.

Return type

Union[int, float]


The construct tree node associated with this construct.

Return type



The scaling interval for autoscaling based off an SQS Queue size.

Return type



The secret environment variables.

Return type

Optional[Mapping[str, Secret]]


The SQS queue that the service will process from.

Return type


Static Methods

classmethod is_construct(x)

Return whether the given object is a Construct.


x (Any) –

Return type