Struct aws_sdk_swf::client::fluent_builders::PollForDecisionTask

pub struct PollForDecisionTask<C = DynConnector, M = AwsMiddleware, R = Standard> { /* fields omitted */ }

Fluent builder constructing a request to PollForDecisionTask.

Used by deciders to get a DecisionTask from the specified decision taskList. A decision task may be returned for any open workflow execution that is using the specified task list. The task includes a paginated view of the history of the workflow execution. The decider should use the workflow type and the history to determine how to properly handle the task.

This action initiates a long poll, where the service holds the HTTP connection open and responds as soon a task becomes available. If no decision task is available in the specified task list before the timeout of 60 seconds expires, an empty result is returned. An empty result, in this context, means that a DecisionTask is returned, but that the value of taskToken is an empty string.

Deciders should set their client side socket timeout to at least 70 seconds (10 seconds higher than the timeout).

Because the number of workflow history events for a single workflow execution might be very large, the result returned might be split up across a number of pages. To retrieve subsequent pages, make additional calls to PollForDecisionTask using the nextPageToken returned by the initial call. Note that you do not call GetWorkflowExecutionHistory with this nextPageToken. Instead, call PollForDecisionTask again.

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 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 event attribute's cause parameter is set to OPERATION_NOT_PERMITTED. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.

Implementations

impl<C, M, R> PollForDecisionTask<C, M, R> where
    C: SmithyConnector,
    M: SmithyMiddleware<C>,
    R: NewRequestPolicy, 

pub async fn send(
    self
) -> Result<PollForDecisionTaskOutput, SdkError<PollForDecisionTaskError>> where
    R::Policy: SmithyRetryPolicy<PollForDecisionTaskInputOperationOutputAlias, PollForDecisionTaskOutput, PollForDecisionTaskError, PollForDecisionTaskInputOperationRetryAlias>, 

Sends the request and returns the response.

If an error occurs, an SdkError will be returned with additional details that can be matched against.

By default, any retryable failures will be retried twice. Retry behavior is configurable with the RetryConfig, which can be set when configuring the client.

pub fn domain(self, inp: impl Into<String>) -> Self

The name of the domain containing the task lists to poll.

pub fn set_domain(self, input: Option<String>) -> Self

The name of the domain containing the task lists to poll.

pub fn task_list(self, inp: TaskList) -> Self

Specifies the task list to poll for decision 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 be the literal string arn.

pub fn set_task_list(self, input: Option<TaskList>) -> Self

Specifies the task list to poll for decision 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 be the literal string arn.

pub fn identity(self, inp: impl Into<String>) -> Self

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

pub fn set_identity(self, input: Option<String>) -> Self

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

pub fn next_page_token(self, inp: impl Into<String>) -> Self

If NextPageToken is returned there are more results available. The value of NextPageToken is a unique pagination token for each page. Make the call again using the returned token to retrieve the next page. Keep all other arguments unchanged. Each pagination token expires after 60 seconds. Using an expired pagination token will return a 400 error: "Specified token has exceeded its maximum lifetime".

The configured maximumPageSize determines how many results can be returned in a single call.

The nextPageToken returned by this action cannot be used with GetWorkflowExecutionHistory to get the next page. You must call PollForDecisionTask again (with the nextPageToken) to retrieve the next page of history records. Calling PollForDecisionTask with a nextPageToken doesn't return a new decision task.

pub fn set_next_page_token(self, input: Option<String>) -> Self

If NextPageToken is returned there are more results available. The value of NextPageToken is a unique pagination token for each page. Make the call again using the returned token to retrieve the next page. Keep all other arguments unchanged. Each pagination token expires after 60 seconds. Using an expired pagination token will return a 400 error: "Specified token has exceeded its maximum lifetime".

The configured maximumPageSize determines how many results can be returned in a single call.

The nextPageToken returned by this action cannot be used with GetWorkflowExecutionHistory to get the next page. You must call PollForDecisionTask again (with the nextPageToken) to retrieve the next page of history records. Calling PollForDecisionTask with a nextPageToken doesn't return a new decision task.

pub fn maximum_page_size(self, inp: i32) -> Self

The maximum number of results that are returned per call. Use nextPageToken to obtain further pages of results.

This is an upper limit only; the actual number of results returned per call may be fewer than the specified maximum.

pub fn set_maximum_page_size(self, input: Option<i32>) -> Self

The maximum number of results that are returned per call. Use nextPageToken to obtain further pages of results.

This is an upper limit only; the actual number of results returned per call may be fewer than the specified maximum.

pub fn reverse_order(self, inp: bool) -> Self

When set to true, returns the events in reverse order. By default the results are returned in ascending order of the eventTimestamp of the events.

pub fn set_reverse_order(self, input: Option<bool>) -> Self

When set to true, returns the events in reverse order. By default the results are returned in ascending order of the eventTimestamp of the events.

Trait Implementations

impl<C: Debug, M: Debug, R: Debug> Debug for PollForDecisionTask<C, M, R>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.