Description

With this change, it will be possible to use:

1. Placeholders for input_path and output_path for all States (except Fail)
2. Placeholders for items_path for Map State
3. Context Object Data for Map states

Fixes#101

Why is the change necessary?

This enables the capacity to define input_path and output_path values dynamically for all States (except Fail State). This also supports using placeholder for items_path and context object for MapState.

Solution

Support Placeholders for input_path, output_path and items_path

During workflow definition serialization, replace placeholder with json path when the parsed argument is one of the three (input_path, output_pat, items_path).

Support Context Object Data for Map State

Add new Placeholder objects MapItemValue and MapItemIndex with a json string template to use during workflow definition serialization.

Example

map_item_value=MapItemValue(schema={'name':str,'age':str    })map_item_index=MapItemIndex()map_state=Map('MapState01',parameters={"MapIndex":map_item_index,"Name":map_item_value['name'],"Age":map_item_value['age']    })iterator_state=Pass('TrainIterator')map_state.attach_iterator(iterator_state)workflow_definition=Chain([map_state])workflow=Workflow(name="MapItemExample",definition=workflow_definition,role=workflow_execution_role)

Workflow definition will be:

{"StartAt":"MapState01","States": {"MapState01": {"Parameters": {"MapIndex.$":"$$.Map.Item.Index","Name.$":"$$.Map.Item.Value['name']","Age.$":"$$.Map.Item.Value['age']"            },"Type":"Map","End":true,"Iterator": {"StartAt":"TrainIterator","States": {"TrainIterator": {"Type":"Pass","End":true                    }                }            }        }    }}

Testing

• Added integ and unit tests

Pull Request Checklist

Please check all boxes (including N/A items)

Testing

• Unit tests added
• integration test added

Documentation

• docs: All relevantdocs updated
• docstrings: All public APIs documented

Title and description

• Change type: Title is prefixed with change type: and followsconventional commits
• References: Indicate issues fixed via:Fixes #xxx

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license.