Camunda User task and UI integration

[kallmekunal]

Hi All,

I am new to Camunda and BPMN and currently evaluating which technology i shall go for my use case.
Use Case description:
Need to have a flow consisting of multiple activities some will be user automated and some may be user driven.User driven tasks will have Configurable substeps.To be manually performed by asignee(With save and exit to execute later).
So my questions are

1. Can we have configurable number of substeps to be manually performed in Camunda.
   2.How these configurable substeps or rules can be configured?
   3.Is it possible to drive such kind of user tasks with Custom UI may be in angular?
   4.If yes how will the UI(Assuming via REST) interacts with the intermediate substeps and control(Stop.Start) them as well.

[aravindhrs]

@kallmekunal Welcome to the forum, Camunda provides out of the box features like, Persistence Strategy based on the following concepts - Compact Tables, Deadlock Avoidance, Control Savepoints, Intelligent Caching, True Concurrency.

Additionally camunda provides extending the core process engine via process engine plugins to add custom behavior to the engine, so that way you can customize and build the custom process engine.

Below posts will help you in understanding camunda bpm and suitability for your business needs.

Camunda_vs_Alternatives_EN.pdf

Camunda Offers a Microservices Workflow Engine, Built on BPMN

Replace Legacy BPMS

For overview of the BPMN 2.0 elements and the current coverage of the process engine: BPMN 2.0 Implementation Reference | docs.camunda.org

Camunda Engine Evolution since Activiti Fork

@kallmekunal

Can we have configurable number of substeps to be manually performed in Camunda.

you can can configure any number of substeps in camunda.

@kallmekunal

2.How these configurable substeps or rules can be configured?

Refer the below post:

Call process based on DMN decision rule

@Mass_Shake you can model a business rule task to make decision on which process need to be invoked before calling the required process from call activity. Lets say in below example, loanType=“Personal Loan” and customerType=“New” then condition will be evaluated and the resultVariable selectedProcess=“PLNEW” (which is process definitionkey of the bpmn will be invoked) Refer the attached dmn & bpmn file for reference. PLNEW.bpmn (2.4 KB) processdecision.dmn (2.4 KB) processSelection.bpmn (…

@kallmekunal

3.Is it possible to drive such kind of user tasks with Custom UI may be in angular?

Refer the below posts:

Process integration with UI

One way of integration is using Camunda Rest api. From UI, you can make rest api calls to camunda server(standalone deployment). https://docs.camunda.org/manual/latest/reference/rest/

Complete user task using rest-api call using springboot

@anji you can follow @Niall video tutorial https://docs.camunda.org/manual/latest/reference/rest/task/post-complete/#example https://blog.camunda.com/post/2015/08/start-and-complete-process-with-rest-api/

Is it possible to make executable process completely with just camunda modeler?

@Behrouz you can make bpmn model as executable in camunda modeller itself by providing necessary scripts for service tasks if required. For example, check below links and examples. validations_example_singe_malt.bpmn (10.3 KB)

Camunda BPM and Existing External Application

Hi @Maysa , Database(RDBMS) is prerequisite for camunda application. You can check supported databases and the version compatibility table here: Extract the code which is only required for process execution flow, incase your process application is shared/container managed or standalone process application. Another option is, without extracting the code from the business application you can embed the process engine with in the existing application itself. DMN usage is depends on your busin…

Finally, to setup a camunda spring boot starter, use this builder to create camunda spring boot project:

Camunda Automation Platform 7 Initializr

@kallmekunal

4.If yes how will the UI(Assuming via REST) interacts with the intermediate substeps and control(Stop.Start) them as well.

Yes. you’re in right path. Rest API will do that REST API Reference | docs.camunda.org