k1729p / study06

Study06 README Contents

Research the Camunda Platform

The sections of this project:

1. Docker Build
2. Models
3. SpringBoot Application with Spring Zeebe Client
4. Workflow

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Java source code. Packages:

application sources :  kp
test sources :  kp.decisions

Java API Documentation ●  Java Test API Documentation

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❶ Docker Build

Action:

1. With batch file "01 Docker create Camunda.bat" create Camunda in Docker.

1.1. The Camunda in Docker is created with Docker configuration docker-compose-core.yaml.

The screenshot of the created Docker containers.

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❷ Models

Action:

1. In "Camunda Modeler" open
business-process-diagram-01.bpmn and decision-requirements-diagram-01.dmn
2. In "Camunda Modeler" deploy business-process-diagram-01.bpmn to local Docker 'http://localhost:26500'.

2.1. The business process model and the decision model were created with Camunda Modeler. This modeler was downloaded and locally installed. The screenshot of the deployment dialog in "Camunda Modeler".

2.2. The business process diagram file business-process-diagram-01.bpmn.

The business process diagram in "Camunda Modeler".

2.3. The decision requirements diagram file decision-requirements-diagram-01.dmn.
From 'impact' and 'urgency' it is computed 'priority'.

The decision requirements diagram in "Camunda Modeler".

2.4. Priority Matrix

	impact
	high	medium	low
urgency high	100	80	40
urgency medium	70	50	20
urgency low	30	10	0

2.5. Condition Matrix

Flow From Service Task	Flow To Service Task	Flow Type	Condition Expression
Triage	High Priority	Sequence Flow	priority >= 80
Triage	Medium Priority	Sequence Flow	priority > 20 and priority < 80
Triage	Low Priority	Default Flow

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❸ SpringBoot Application with Spring Zeebe Client

Action:

1. With batch file "02 MVN clean install run.bat" run the SpringBoot application with the enabled Zeebe client.

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❹ Workflow

Action:

1. Start workflow with batch file "03 Zeebe start instances.bat".

4.1. The workflow results from the Zeebe CLI client.

Console log from the execution of the batch file "03 Zeebe start instances.bat".

4.2. The workflow results from the SpringBoot application.

Console log from the SpringBoot application.

4.3. The Zeebe workers are the components that subscribe to Zeebe to execute available jobs:

• kp.workers.impl.TriageWorker
• kp.workers.impl.HighPriorityWorker
• kp.workers.impl.MediumPriorityWorker
• kp.workers.impl.LowPriorityWorker
• kp.workers.impl.ApproveWorker

4.4. Assigning the workers (SpringBoot components) to the service tasks (from the business process diagram).

Service task "Triage" has the task definition type "service-triage".
This type is set in method kp.workers.impl.TriageWorker::handle on 'JobWorker' annotation.
In method kp.workers.impl.TriageWorker::initialize is created 'DmnDecision' from parsed decision requirements diagram file decision-requirements-diagram-01.dmn.
This 'DmnDecision' is evaluated in 'kp.workers.impl.TriageWorker::handle' method.

Service task "High Priority" has the task definition type "service-priority-high".
This type is set in method kp.workers.impl.HighPriorityWorker::handle on 'JobWorker' annotation.

Service task "Medium Priority" has the task definition type "service-priority-medium".
This type is set in method kp.workers.impl.MediumPriorityWorker::handle on 'JobWorker' annotation.

Service task "Low Priority" has the task definition type "service-priority-low".
This type is set in method kp.workers.impl.LowPriorityWorker::handle on 'JobWorker' annotation.

Service task "Approve" has the task definition type "service-approve".
This type is set in method kp.workers.impl.ApproveWorker::handle on 'JobWorker' annotation.
This worker sets unconditionally the value "approved".

4.5. The workflow results in "Camunda Operate" on Docker http://localhost:8081/.
The screenshot of all three process instances
The screenshot of the process instance triaged to high priority
The screenshot of the process instance triaged to medium priority
The screenshot of the process instance triaged to low priority

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Process Optimization

There is a possibility to install "Camunda Optimize" with an alternative docker configuration docker-compose.yaml. The screenshot of the optimization heat map for the "Defect's Triage Process".

Dictionary

Camunda Platform	workflow and decision automation platform
Camunda	process orchestrator
Zeebe	workflow engine for microservices orchestration
BPMN	Business Process Model and Notation
DMN	Decision Model and Notation
DRD	Decision Requirements Diagram
COTS	Commercial Off-The-Shelf Software
RPA	Robotic Process Automation

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