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 returns 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).
You can use IAM policies to control this action's access to Amazon SWF resources as follows:
Resource element with the domain name to limit the action to
only specified domains.
Action element to allow or deny permission to call this
taskList.name parameter by using a
Condition element with the
swf:taskList.name key to allow the
action to access only certain task lists.
If the caller doesn't have sufficient permissions to invoke the action, or the
parameter values fall outside the specified constraints, the action fails. The associated
cause parameter is set to
For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF
Workflows in the Amazon SWF Developer Guide.