EnsembleWorkflowEnsembleWorkflow
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Restful web API for InterSystems Ensemble / InterSystems IRIS Workflow

WorkflowAPI

Restful API for InterSystems Data Platforms Workflow. This is the latest version, previous projects are deprecated and should not be used in new projects.

Installation

  1. Import and compile this isc.wf.REST.
  2. Create a web-application for REST in the Portal Management System (for ex. /csp/workflow/rest). Set dispatch class to isc.wf.REST, Authentication methods to 'Unauthorized' and 'Password'.
  3. (Optional) Add isc.wf package mapping if you need to query another namespace.

Requests

These are the possible requests to web application. Postman collection is available.

URL Type Response Description
tasks/:count/:maxId GET JSON Get unassigned tasks or tasks assigned to the current user. Params optional
task/:id GET JSON Get detailed information about a task
task/:id POST JSON Process task modified by a user
test GET JSON Test info

Prerequisites

If you work with Ensemble Workflow it is recommended to familiarize yourself with EnsLib.Workflow package. Here's a quick primer on the main classes:

Class Description
EnsLib.Workflow.ActionDefinition Defines the set of available actions that a user can make within a Workflow application. Users can extend this list.
EnsLib.Workflow.Engine Provides the core APIs for the Ensemble Workflow system.
EnsLib.Workflow.FormEngine Provides the API for managing form associated with Workflow tasks.
EnsLib.Workflow.Operation This Business Operation manages the delegation of workflow tasks to the Ensemble Workflow Engine.
EnsLib.Workflow.RoleDefinition Defines a workflow role and its members.
EnsLib.Workflow.RoleMembership Manages the many-to-many relationship of workflow Users and Roles. Each instance represents the association of a specific User with a specific Role.
EnsLib.Workflow.TaskRequest A task is a specialized request for a user action (it is used as part of a Workflow application).
EnsLib.Workflow.TaskResponse Response from a Workflow Task request. The Workflow Engine creates an instance of TaskResponse object as soon it receives a TaskRequest. This object is used to maintain the status of the task while it is under the control of the Workflow Engine. It also serves as the final response returned by the Workflow Engine when the task is complete.
EnsLib.Workflow.TaskStatus Holds Task Status details used by Workflow Engine to manage tasks.
EnsLib.Workflow.UserDefinition Defines a workflow user. Typically the user name matches a system user name but this is not required. Workflow users that are not registered system users will not be able to log into the Workflow portal and check the status of their worklist.
EnsLib.Workflow.Worklist Represents a worklist item associated with a User within a Workflow application.

GET tasks

It's the basic and first request you need to execute after logging in (by authentication method you configured for REST web application). It returns basic information unassigned tasks or tasks assigned to a current user. You can provide two parameters:

  • count - number of records to return (defaults to 100)
  • maxId - last id from previous page (if left empty all tasks would be returned)

Tasks are returned in reverse chronological order, newest to oldest. Here's how it looks like:

[
    {
        "id": "318||dev",
        "isNew": 1,
        "priority": 3,
        "subject": "Problem reported by 1",
        "message": "2",
        "timeCreated": "2018-08-24 07:07:22.717",
        "role": "Demo-Development"
    },
    {
        "id": "308||dev",
        "isNew": 1,
        "priority": 3,
        "subject": "Problem reported by 3",
        "message": "3",
        "timeCreated": "2018-11-28 19:03:41.95",
        "role": "Demo-Development"
    }
]

Here we can see two tasks, fist unassigned and second assigned to a current user (dev). Object properties are

Property Description Value
id Id of this EnsLib.Workflow.Worklist
isNew Has the user accepted this item yet? 1 for no (new), 0 for yes (accepted)
priority Priority of the requested Task 1 is highest
subject Short summary of this task
message Detailed message body for this task First 25 symbols only
timeCreated Creation time UTC timestamp
role The workflow role (EnsLib.Workflow.RoleDefinition)

GET task/:id

After you received main information about available tasks, you can see it in more detail, by requesting it by id (308||dev in the example). Here's how response object looks like:

{
    "id": "308||dev",
    "isNew": 1,
    "priority": 3,
    "subject": "Problem reported by 3",
    "message": "3",
    "timeCreated": "2018-11-28 19:03:41.95",
    "role": "Demo-Development",
    "actions": "Corrected,Ignored",
    "formFields": {
        "Comments": "Comment value, if any"
    }
}

Properties are the same, except two new properties are added

Property Description Value
actions List of possible actions Comma separated. Does not include systems actions $Accept, $Relinquish and $Save
formFields Object with fields and their values JSON Object

It's just a JSON representation of EnsLib.Workflow.Worklist object. This request provides enough information to display task to the user.

POST task/:id

After a user is done working on a task, you need to notify Workflow engine about a new state of a task. To do that, execute this request, with the JSON representation of EnsLib.Workflow.Worklist object (received from the previous request) as a body. To express changes made by a user, send this object:

  • Set action property to one of the %Actions values or $Accept to accept a task, $Relinquish to relinquish task and $Save to save changes made to a task
  • Provide formValues object with ALL values, even unmodified ones.

Here's an example of a user modifying 308||dev task (by choosing Save action):

{
	"action": "$Save", 
	"formFields": {
		"Comments": "New comment value"
	}
}