feat(construct): bedrock batch step functions fragment (#928)

* feat(construct): bedrock batch step functions fragment

This PR introduces a new L3 construct BedrockBatchSfn that simplifies running batch inference jobs
with Amazon Bedrock using AWS Step Functions. The construct creates a state machine fragment that:

 - Processes multiple input manifests in parallel using Step Functions Map state
 - Creates and monitors Bedrock batch inference jobs asynchronously
 - Handles job completion to continue state machine execution without polling.
 - Manages IAM roles and permissions for secure execution
 - Provides configurable timeout settings (24h-168h range)

This construct helps developers implement batch inference workflows without managing complex
infrastructure code, while following AWS best practices for security and scalability.

---------

Co-authored-by: Alain Krok <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

README.md

@@ -139,6 +139,7 @@ The following constructs are available in the library:
 | [Amazon Bedrock Monitoring (Amazon CloudWatch Dashboard)](./src/patterns/gen-ai/aws-bedrock-cw-dashboard/README.md) | Amazon CloudWatch dashboard to monitor model usage from Amazon Bedrock. | Amazon CloudWatch |
 | [TXT to SQL](./src/patterns/gen-ai/aws-text-to-sql/README.md) |  Leverages generative AI capabilities to facilitate natural language-based SQL query generation.  | Amazon Event Bridge, Amazon Bedrock, AWS Lambda, Amazon SQS, AWS Secrets, and database of choice |
 | [LlamaIndex Data Loading](./src/patterns/gen-ai/aws-llama-index-data-loader/README.md) | Use LlamaIndex to load data in preparation for generative AI workloads | Amazon ECS Fargate, Amazon SQS, and AWS Systems Manager Parameters |
+| [Bedrock Batch Step Functions](./src/patterns/gen-ai/aws-bedrock-batch-stepfn/README.md) | Manage Bedrock model invocation jobs(batch inference) in AWS Step Functions state machines | AWS Step Functions, AWS Lambda, AWS EventBridge, Amazon Bedrock, AWS IAM |
 
 ### L2 Constructs
 

apidocs/README.md

@@ -22,6 +22,7 @@
 
 - [AossCwDashboard](classes/AossCwDashboard.md)
 - [BaseClass](classes/BaseClass.md)
+- [BedrockBatchSfn](classes/BedrockBatchSfn.md)
 - [BedrockCwDashboard](classes/BedrockCwDashboard.md)
 - [ContainerImage](classes/ContainerImage.md)
 - [ContentGenerationAppSyncLambda](classes/ContentGenerationAppSyncLambda.md)
@@ -43,6 +44,7 @@
 - [AossCwDashboardProps](interfaces/AossCwDashboardProps.md)
 - [AsyncInferenceConfig](interfaces/AsyncInferenceConfig.md)
 - [BaseClassProps](interfaces/BaseClassProps.md)
+- [BedrockBatchSfnProps](interfaces/BedrockBatchSfnProps.md)
 - [BedrockCwDashboardProps](interfaces/BedrockCwDashboardProps.md)
 - [CollectionMonitoringProps](interfaces/CollectionMonitoringProps.md)
 - [ContainerImageConfig](interfaces/ContainerImageConfig.md)

apidocs/classes/BedrockBatchSfn.md

@@ -0,0 +1,257 @@
+[**@cdklabs/generative-ai-cdk-constructs**](../README.md)
+
+***
+
+[@cdklabs/generative-ai-cdk-constructs](../README.md) / BedrockBatchSfn
+
+# Class: BedrockBatchSfn
+
+A state machine fragment that creates a Bedrock Batch Inference Job and waits for its completion.
+
+Input schema:
+```
+{
+  "job_name": string,        // Required. Name of the batch inference job
+  "manifest_keys": string[],    // Required. List of S3 keys of the input manifest files
+  "model_id": string        // Required. Model ID to use.
+}
+```
+
+Output schema:
+```
+{
+  "status": string,        // Required. Status of the batch job. One of: "Completed" or "PartiallyCompleted"
+  "bucket": string,        // Required. S3 bucket where the output is stored
+  "keys": string[]         // Required. Array of S3 keys for the output files
+}
+```
+
+Error schema:
+```
+{
+  "status": string,        // Required. Status will be one of: "Failed", "Stopped", or "Expired"
+  "error": string,         // Required. Error code
+  "cause": string          // Required. Error message
+}
+```
+
+## Extends
+
+- `StateMachineFragment`
+
+## Constructors
+
+### new BedrockBatchSfn()
+
+> **new BedrockBatchSfn**(`parent`, `id`, `props`): [`BedrockBatchSfn`](BedrockBatchSfn.md)
+
+#### Parameters
+
+##### parent
+
+`Construct`
+
+##### id
+
+`string`
+
+##### props
+
+[`BedrockBatchSfnProps`](../interfaces/BedrockBatchSfnProps.md)
+
+#### Returns
+
+[`BedrockBatchSfn`](BedrockBatchSfn.md)
+
+#### Overrides
+
+`sfn.StateMachineFragment.constructor`
+
+## Properties
+
+### endStates
+
+> `readonly` **endStates**: `INextable`[]
+
+The states to chain onto if this fragment is used
+
+#### Overrides
+
+`sfn.StateMachineFragment.endStates`
+
+***
+
+### node
+
+> `readonly` **node**: `Node`
+
+The tree node.
+
+#### Inherited from
+
+`sfn.StateMachineFragment.node`
+
+***
+
+### startState
+
+> `readonly` **startState**: `State`
+
+The start state of this state machine fragment
+
+#### Overrides
+
+`sfn.StateMachineFragment.startState`
+
+## Accessors
+
+### id
+
+#### Get Signature
+
+> **get** **id**(): `string`
+
+Descriptive identifier for this chainable
+
+##### Returns
+
+`string`
+
+#### Inherited from
+
+`sfn.StateMachineFragment.id`
+
+## Methods
+
+### next()
+
+> **next**(`next`): `Chain`
+
+Continue normal execution with the given state
+
+#### Parameters
+
+##### next
+
+`IChainable`
+
+#### Returns
+
+`Chain`
+
+#### Inherited from
+
+`sfn.StateMachineFragment.next`
+
+***
+
+### prefixStates()
+
+> **prefixStates**(`prefix`?): `StateMachineFragment`
+
+Prefix the IDs of all states in this state machine fragment
+
+Use this to avoid multiple copies of the state machine all having the
+same state IDs.
+
+#### Parameters
+
+##### prefix?
+
+`string`
+
+The prefix to add. Will use construct ID by default.
+
+#### Returns
+
+`StateMachineFragment`
+
+#### Inherited from
+
+`sfn.StateMachineFragment.prefixStates`
+
+***
+
+### toSingleState()
+
+> **toSingleState**(`options`?): `Parallel`
+
+Wrap all states in this state machine fragment up into a single state.
+
+This can be used to add retry or error handling onto this state
+machine fragment.
+
+Be aware that this changes the result of the inner state machine
+to be an array with the result of the state machine in it. Adjust
+your paths accordingly. For example, change 'outputPath' to
+'$[0]'.
+
+#### Parameters
+
+##### options?
+
+`SingleStateOptions`
+
+#### Returns
+
+`Parallel`
+
+#### Inherited from
+
+`sfn.StateMachineFragment.toSingleState`
+
+***
+
+### toString()
+
+> **toString**(): `string`
+
+Returns a string representation of this construct.
+
+#### Returns
+
+`string`
+
+#### Inherited from
+
+`sfn.StateMachineFragment.toString`
+
+***
+
+### isConstruct()
+
+> `static` **isConstruct**(`x`): `x is Construct`
+
+Checks if `x` is a construct.
+
+Use this method instead of `instanceof` to properly detect `Construct`
+instances, even when the construct library is symlinked.
+
+Explanation: in JavaScript, multiple copies of the `constructs` library on
+disk are seen as independent, completely different libraries. As a
+consequence, the class `Construct` in each copy of the `constructs` library
+is seen as a different class, and an instance of one class will not test as
+`instanceof` the other class. `npm install` will not create installations
+like this, but users may manually symlink construct libraries together or
+use a monorepo tool: in those cases, multiple copies of the `constructs`
+library can be accidentally installed, and `instanceof` will behave
+unpredictably. It is safest to avoid using `instanceof`, and using
+this type-testing method instead.
+
+#### Parameters
+
+##### x
+
+`any`
+
+Any object
+
+#### Returns
+
+`x is Construct`
+
+true if `x` is an object created from a class which extends `Construct`.
+
+#### Inherited from
+
+`sfn.StateMachineFragment.isConstruct`