amazonka-swf-0.0.4: Amazon Simple Workflow Service SDK.

Safe HaskellNone




Used by workers to get an ActivityTask from the specified activity taskList. This initiates a long poll, where the service holds the HTTP connection open and responds as soon as a task becomes available. The maximum time the service holds on to the request before responding is 60 seconds. If no task is available within 60 seconds, the poll will return an empty result. An empty result, in this context, means that an ActivityTask is returned, but that the value of taskToken is an empty string. If a task is returned, the worker should use its type to identify and process it correctly.

Workers should set their client side socket timeout to at least 70 seconds (10 seconds higher than the maximum time service may hold the poll request). Access Control

You can use IAM policies to control this action's access to Amazon SWF resources as follows:

Use a Resource element with the domain name to limit the action to only specified domains. Use an Action element to allow or deny permission to call this action. Constrain the '' parameter by using a Condition element with the '' key to allow the action to access only certain task lists. If the caller does not have sufficient permissions to invoke the action, or the parameter values fall outside the specified constraints, the action fails by throwing OperationNotPermitted. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWFWorkflows.



Request constructor

pollForActivityTask Source

PollForActivityTask constructor.

The fields accessible through corresponding lenses are:

Request lenses

pfatDomain :: Lens' PollForActivityTask Text Source

The name of the domain that contains the task lists being polled.

pfatIdentity :: Lens' PollForActivityTask (Maybe Text) Source

Identity of the worker making the request, which is recorded in the ActivityTaskStarted event in the workflow history. This enables diagnostic tracing when problems arise. The form of this identity is user defined.

pfatTaskList :: Lens' PollForActivityTask TaskList Source

Specifies the task list to poll for activity tasks.

The specified string must not start or end with whitespace. It must not contain a : (colon), / (slash), '|' (vertical bar), or any control characters (u0000-u001f | u007f - u009f). Also, it must not contain the literal string "arn".


Response constructor

Response lenses

pfatrInput :: Lens' PollForActivityTaskResponse (Maybe Text) Source

The inputs provided when the activity task was scheduled. The form of the input is user defined and should be meaningful to the activity implementation.

pfatrTaskToken :: Lens' PollForActivityTaskResponse Text Source

The opaque string used as a handle on the task. This token is used by workers to communicate progress and response information back to the system about the task.

pfatrWorkflowExecution :: Lens' PollForActivityTaskResponse WorkflowExecution Source

The workflow execution that started this activity task.