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<!DOCTYPE html>
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<meta name="author" content="Doc Writer">
<title>Workflow Business Case: Policy Updates with Workflow Orchestration, Case Management with BPMN and Custom UI</title>
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<body class="article toc2 toc-right">
<div id="header">
<h1>Workflow Business Case: Policy Updates with Workflow Orchestration, Case Management with BPMN and Custom UI</h1>
<div class="details">
<span id="author" class="author">Doc Writer</span><br>
<span id="email" class="email"><a href="mailto:[email protected]">[email protected]</a></span><br>
<span id="revnumber">version 1.0,</span>
<span id="revdate">2021-05-10</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#__poc_goals">Chubb PoC Goals</a>
<ul class="sectlevel2">
<li><a href="#_important_links">Important Links</a></li>
</ul>
</li>
<li><a href="#_use_case">Use Case</a>
<ul class="sectlevel3">
<li><a href="#_summary">Summary</a></li>
<li><a href="#_workflow">Workflow</a></li>
<li><a href="#_case_management_with_custom_ui_and_bpmn">Case management with Custom UI and BPMN</a></li>
<li><a href="#_integrations_summary">Integrations Summary</a></li>
</ul>
</li>
<li><a href="#_running_the_use_case">Running the use-case</a>
<ul class="sectlevel4">
<li><a href="#_option_1_use_spring_boot_at_the_command_line">Option 1. Use spring-boot at the command line</a></li>
<li><a href="#_option_2_use_docker_compose">Option 2. Use docker-compose</a></li>
<li><a href="#_option_3_build_the_jar">Option 3. Build the jar</a></li>
<li><a href="#_option_4_use_kuberneties_and_delcaritive_infra">Option 4. Use Kuberneties and Delcaritive Infra</a></li>
<li><a href="#_using_profiles">Using Profiles</a></li>
<li><a href="#_see_it_running">See it running</a></li>
</ul>
</li>
<li><a href="#_using_enterprise_camunda">Using Enterprise Camunda</a></li>
<li><a href="#_testing_with_postman">Testing with Postman</a></li>
<li><a href="#_architecture">Architecture</a>
<ul class="sectlevel2">
<li><a href="#_abstraction_layers">Abstraction Layers</a></li>
<li><a href="#_architecture_patterns">Architecture Patterns</a></li>
</ul>
</li>
<li><a href="#_patterns_for_integration">Patterns for Integration</a>
<ul class="sectlevel2">
<li><a href="#_access_to_the_workflow_execution_context">Access to the workflow execution context</a></li>
<li><a href="#_external_task_pattern_for_polyglot_programming">External Task Pattern for Polyglot Programming</a></li>
<li><a href="#_send_and_recieve">Send and Recieve</a></li>
<li><a href="#_kafka_integration">Kafka Integration</a></li>
<li><a href="#_camunda_spring_event_listener_bridge">Camunda-Spring Event Listener Bridge</a></li>
</ul>
</li>
<li><a href="#_ui_integration">UI Integration</a>
<ul class="sectlevel3">
<li><a href="#_reactjs_integration">ReactJS Integration</a></li>
</ul>
</li>
<li><a href="#_handling_business_data_and_ui_integration">Handling Business Data and UI Integration</a>
<ul class="sectlevel3">
<li><a href="#_camunda_rest_api">Camunda REST API</a></li>
<li><a href="#_jpa_spring_data_repositories">JPA Spring Data Repositories</a></li>
</ul>
</li>
<li><a href="#_developing_with_this_poc_starter_project">Developing with this PoC Starter Project</a>
<ul class="sectlevel3">
<li><a href="#_setting_up_react_for_dev">Setting up React for Dev</a></li>
<li><a href="#_running_the_server_for_dev">Running the server for Dev</a></li>
</ul>
</li>
<li><a href="#_other_tools">Other Tools</a>
<ul class="sectlevel2">
<li><a href="#_mail_slurper">Mail Slurper</a></li>
<li><a href="#_kafka">Kafka</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div class="sect1 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-2">
<h2 id="__poc_goals">Chubb PoC Goals</h2>
<div class="sectionbody">
<div class="ulist checklist has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-3">
<ul class="checklist">
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-3">
<p>✓ <strong>Identify gaps in Camunda</strong> (Hopefully the PoC itself provided the context for this goal)</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-4">
<p>✓ <strong>Pros and Cons of forms with Camunda</strong> (Discussed need for custom UI integration, forms integration with Camunda is flexible and allows the use of third party form frameworks. See <a href="#ui-integration">Example UI Integration</a>)</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-5">
<p>✓ <strong>Integration with custom UI</strong> (See <a href="#ui-integration">Example UI Integration</a> and the <a href="#custom-triage-tasks">Custom Traige Tasks</a>)</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-6">
<p>✓ <strong>Case managemet with Camunda and BPMN</strong> (See <a href="#ui-integration">Example UI Integration</a> and the <a href="#interesting-point-workflow">Case Management use-case</a>)</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-7">
<p>✓ <strong>Integration with Kafka</strong> (See <a href="#kafka-integration">Kafak Integration</a>)</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-8">
<p>✓ <strong>Business Data Integration</strong> (See <a href="#business-data-in-workflow">Handling Business Data in Workflows</a>)</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-9">
<p>✓ <strong>Reporting, metrics and capturing history events</strong> (Demoed Optimize see <a href="#use-case-integrations-summary">Integrations</a> for more on metrics and capturing events)</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-10">
<p>✓ <strong>Email integration with intake framework</strong> (This was completely mocked with Postman due to the complexity of the integration)</p>
</li>
</ul>
</div>
<div class="sect2 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-12">
<h3 id="_important_links">Important Links</h3>
<div class="ulist has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-13">
<ul>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-13">
<p>See the <a href="https://github.com/plungu/camunda--poc-starter">code in github</a>. You can downlaod and run the project.</p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-14">
<p>See more about <a href="https://camunda.com/products/camunda-platform/optimize/reports/">Reporting and tracing with Optimize</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-15">
<p>See more about <a href="https://camunda.com/enterprise/">Enterprise Features</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-16">
<p>See more about <a href="https://camunda.com/products/camunda-platform/cockpit/#features">Enterprise Cockpit Features</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-17">
<p>See more about <a href="https://github.com/camunda/camunda-modeler/tree/master/docs/element-templates">Customize Modeler with Element Templates</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-18">
<p>See more about <a href="https://github.com/camunda/camunda-modeler-plugins">Customize Modeler with Plugins</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-19">
<p>See more about <a href="https://docs.camunda.org/manual/latest/user-guide/process-engine/transactions-in-processes/">Transactions in Process</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-20">
<p>See more about <a href="https://github.com/camunda/camunda-bpm-examples/tree/master/process-engine-plugin">Camunda Engine Plugins</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-21">
<p>See more about <a href="https://docs.camunda.org/manual/7.14/user-guide/spring-boot-integration/the-spring-event-bridge/">Camunda Spring Event Bridge</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-22">
<p>See more about <a href="https://docs.camunda.org/manual/7.12/user-guide/process-engine/history/">Understanding Camunda History</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-23">
<p>See more about <a href="https://camunda.com/best-practices/reporting-about-processes/#_accessing_strong_historical_data_strong">Accessing Historical Data</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-24">
<p>See more about <a href="https://docs.camunda.org/manual/latest/user-guide/process-engine/database/database-schema/">Understanding Camunda Database</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-25">
<p>See more about <a href="https://docs.camunda.org/manual/latest/user-guide/process-engine/external-tasks/">Understand External Tasks</a></p>
</li>
<li class="has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/poc-goals-links.adoc-26">
<p>See more about <a href="https://cawemo.com/">Modeling and Collaboration with Cawemo</a></p>
</li>
</ul>
</div>
</div>
</div>
</div>
<div class="sect1 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-1">
<h2 id="_use_case">Use Case</h2>
<div class="sectionbody">
<div class="sect3 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-3">
<h4 id="_summary">Summary</h4>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-4">
<p>Post Buying Process use-case is demonstrating updating a insurance policy based on certain events that can trigger a policy update.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-6">
<p>The Web Based UI demonstrates the Triage of a Policy Update allowing the Triage role to see tasks based on skills and entitlement.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-8">
<p>A single Triage task combined with an Event Sub-process is used to simulate a case management pattern with BPMN.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-10">
<p>Additionally, DMN based business rules are utilized to route tasks to the correct business unit and assign the correct user roles to tasks.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-12">
<p>History data should be sent to Kafka to potentially store in a BI solution.</p>
</div>
</div>
<div class="sect3 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-15">
<h4 id="_workflow"><a id="use-case-workflow"></a>Workflow</h4>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-16">
<p>Underwriters and Brokers interact to potentially trigger a policy update. This is normally done through email interactions. When a policy update is needed an underwirter will send an email to a shared email box. The Intake Framework with parse and determine the intent of the email then start a policy update workflow (post-bind-workflow) when appropriate.</p>
</div>
<div class="admonitionblock note has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-18">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">
The intake framework is simulate by a Postman call to start the workflow. See the <code>postman</code> directory for the request to start the workflow.
</td>
</tr>
</table>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-20">
<p>The triage task is then activated. This enables a triage user to view the task in the Custom UI and prepare the task for Underwriting and Processing. Additionally, a case management feature can be used by the triage user potentially starting a credit-check.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-22">
<p><span class="image"><img src="./images/use-case/use-case-triage-task-ui.png" alt="triage task ui" width="900"></span></p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-24">
<p>Once the triage user submits the task business rules are used to assign and route the tasks to the correct business unit and users.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-26">
<p><span class="image"><img src="./images/use-case/post-buying-process.png" alt="Update Policy BPMN"></span></p>
</div>
<hr>
</div>
<div class="sect2 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-30">
<h3 id="_case_management_with_custom_ui_and_bpmn"><a id="interesting-point-workflow"></a>Case management with Custom UI and BPMN</h3>
<div class="exampleblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-31">
<div class="content">
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-32">
<p>This section of the process illustrates case management with BPMN. The Triage user is able to start a credit check from the UI. The use clicks the <code>Start Credit Check</code> button which triggers the Credit Check SubProcess.</p>
</div>
</div>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-34">
<p><span class="image"><img src="./images/patterns/ui-interaction-case-mgmt.png" alt="Case Mangemet UI BPMN" width="300" height="200"></span></p>
</div>
<div class="exampleblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-35">
<div class="content">
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-36">
<p>The Credit Check sub-process is broken into two phases. An Event subprocess is utilized to capture the click from the UI and allows us to monitor the status of the credit check from the parent process. Additionally, using the Event sub-process doesn’t interfere with execution of the parent process. In other words the Triage user could also submit the task and continue the normal flow of the process while the credit check continues.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-38">
<p>A separate BPMN workflow is also utilized for the Credit Check. It does the actual work of orchestrating the credit check. This allows for reuse of the credit check workflow and concise separation of concerns.</p>
</div>
</div>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-41">
<p><span class="image"><img src="./images/patterns/case-mgmt-pattern.png" alt="Case Managment BPMN"></span></p>
</div>
</div>
<div class="sect2 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-43">
<h3 id="_integrations_summary"><a id="use-case-integrations-summary"></a>Integrations Summary</h3>
<div class="exampleblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-44">
<div class="content">
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-45">
<p>The integrations with the UI are REST based. Starting, retrieving, completing tasks and workflows are done through the Camunda REST API.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-47">
<p>Technical integrations like email integration is done through Camunda delegates and listeners. When a user task is started an email is sent to the user.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-49">
<p>Additionally, Kafka integration is done through spring-eventing-bridge and spring-clould-streams framework for the purpose of sending Camunda event information to other systems i.e. BI reporting solutions. See <a href="#patterns-for-integration">Patterns for Integration</a> and <a href="#kafka-integartion">Kafka Integration</a></p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/use-case-policy-update.adoc-51">
<p>More on all these topics in later sections. Jump to section <a href="#ui-integration">UI Integration</a> <a href="#spring-eventing-bridge">Spring Eventing Bridge</a></p>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sect1 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-2">
<h2 id="_running_the_use_case">Running the use-case</h2>
<div class="sectionbody">
<div class="admonitionblock important has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-4">
<table>
<tr>
<td class="icon">
<div class="title">Important</div>
</td>
<td class="content">
if you want to use Camunda Enterprise you will need to download the enterpise license. See the section on <a href="#enterprise-camunda">setting up Camunda Enterprise</a>
</td>
</tr>
</table>
</div>
<div class="sect4 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-6">
<h5 id="_option_1_use_spring_boot_at_the_command_line">Option 1. Use spring-boot at the command line</h5>
<div class="listingblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-7">
<div class="content">
<pre class="CodeRay highlight"><code>mvn spring-boot:run -Dspring.profiles.active=servicerequest,integration,cors</code></pre>
</div>
</div>
</div>
<div class="sect4 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-11">
<h5 id="_option_2_use_docker_compose">Option 2. Use docker-compose</h5>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-12">
<p>This should allow you to simple run the in a self contained manner. You must have docker installed on the machine.</p>
</div>
<div class="listingblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-13">
<div class="content">
<pre class="CodeRay highlight"><code>docker-compose up</code></pre>
</div>
</div>
</div>
<div class="sect4 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-17">
<h5 id="_option_3_build_the_jar">Option 3. Build the jar</h5>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-18">
<p>Build the .jar with maven</p>
</div>
<div class="literalblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-20">
<div class="content">
<pre>mvn clean package -DskipTests</pre>
</div>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-22">
<p>Run the .jar with java</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-24">
<p>java -Dspring.profiles.active=servicerequest,integration,cors -jar ./target/camunda-poc-starter.jar</p>
</div>
</div>
<div class="sect4 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-26">
<h5 id="_option_4_use_kuberneties_and_delcaritive_infra">Option 4. Use Kuberneties and Delcaritive Infra</h5>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-27">
<p>This is still in progress.</p>
</div>
</div>
<div class="sect2 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-30">
<h3 id="_using_profiles">Using Profiles</h3>
<div class="exampleblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-31">
<div class="content">
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-32">
<p><strong>Profiles</strong> can be specified at the command line when the application starts. The notation is as follows.</p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-34">
<p><code>-Dspring.profiles.active=servicerequest,integration,cors</code></p>
</div>
<div class="paragraph has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-36">
<p>Or you can use the application.properties file to specify the profile.</p>
</div>
<div class="listingblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-38">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="yaml"><span style="color:#606">spring.profiles.active</span>: <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#D20">servicerequest,integration,cors</span></span></code></pre>
</div>
</div>
</div>
</div>
<div class="admonitionblock important has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-43">
<table>
<tr>
<td class="icon">
<div class="title">Important</div>
</td>
<td class="content">
Using Camunda Enterprise - it’s necessary to request a Camunda Enterprise License.
</td>
</tr>
</table>
</div>
</div>
<div class="sect2 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-48">
<h3 id="_see_it_running">See it running</h3>
<div class="exampleblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-49">
<div class="content">
<div class="literalblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-50">
<div class="content">
<pre>Visit `http://<server>:<port>/sr` to access the React app</pre>
</div>
</div>
<div class="literalblock has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/running-use-case.adoc-52">
<div class="content">
<pre>Visit `http://<server>:<port>/camunda/app/cockpit` to access Camunda Cockpit</pre>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sect1 has-source-line data-line-/Users/paullungu/projects/camunda-kafka-starter-example/docs/using-enterprise-camunda.adoc-1">
<h2 id="_using_enterprise_camunda"><a id="enterprise-camunda"></a>Using Enterprise Camunda</h2>
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<div class="title">Important</div>
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Using Camunda Enterprise - it’s necessary to request a <a href="https://camunda.com/download/enterprise/">Camunda Enterprise License</a>.
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<p>Update the settings.xml file in the project home with the credentials that you get from Camunda. This will allow you to pull the enterprise artifacts from our nexus repository.</p>
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<div class="title">Note</div>
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You may need to configure a proxy to reach our repository. See the example in the settings.xml.
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<h2 id="_testing_with_postman">Testing with Postman</h2>
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<p>Use the postman collections in the <code>postman</code> folder.</p>
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<p>With post-man you can move through the processes simulating REST requests to the app.</p>
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<p>starting the processes</p>
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<p>completing user tasks</p>
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<p>correlating messages</p>
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<p>loading test data</p>
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<h2 id="_architecture">Architecture</h2>
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<p>The architecture diagram below generically demonstrates the possibilities and patterns interacting with the workflow. It’s worth noting this is not a top-down model for interacting with the workflow, merely one possible approach and patterns that can be generally applied.</p>
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<p>Aync and synchronous interaction with the engine is possible and should be considered carefully based on the business and technical requirements of the use-case.</p>
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<p><span class="image"><img src="./images/architecture/architecture.png" alt="Architecture BPMN"></span></p>
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<p>The green bar signifies kafka. Events are published to kafka from the workflow. The implementation for the publishers can be in . This pattern works well as we can utilize the Delegate and the Send task to control the execution of the workflow and potentially ack kafka and handle incidents when Publishing fails.</p>
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<p>Green lines signify publishing of asynchronous messages from the workflow.</p>
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<p>The orange boxes signify components that sub-scribe to kafka and update other components based on the Events that they receive.</p>
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<p>Orange lines signify subscription from external systems to Kafaka topics for various purposes.</p>
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<p>The blue boxes signify components that do specific work and are potentially interact with the subscription components in yellow. Or could interact more synchronously with the workflow, though often through an abstraction layer.</p>
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<p>Purple lines and events signify point-to-point synchronous HTTP/REST interactions with the workflow and other components.</p>
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An important takeaway is that different patterns for interactions with the workflow are possible and often desirable. It can make sense to have a orchestrated approach in some cases and a choreographed approach in other cases within the same workflow or broader use-case.
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This is a typical pattern for micro-service architectures though the level of abstraction between components will vary from use-case to use-case.
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<h3 id="_abstraction_layers">Abstraction Layers</h3>
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<p>Another important requirement is to integrate with other systems such as UI, entitlement, authorization and authentication, as well as other legacy systems. To meet this requirement it’s often desirable to have an abstraction layer around Camunda. This abstraction layer can include several different technologies include custom REST API’s, Kafka, API aggregation tools like MuleSoft, GraphQL, caching technologies such as Hazelcast and others depending on your use-case. There really is no limitations with Camunda.</p>
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<h3 id="_architecture_patterns">Architecture Patterns</h3>
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<h4 id="_command">COMMAND</h4>
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<p>Spring REST controllers can be used to post data to the workflow. Simple and concise API’s are defined should be deifned for interaction with the process. See <code>WorkflowController.java</code> The API always takes an object and returns and HTTP Status. The RESTful endpoint context mapping is associated to Commands that can happen in the system. Such as START, APPROVE and REJECT and intended to work in a point-to-point(request/response) synchronous fashion.</p>
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<p>The controllers only write POST/PUT data CREATING and UPDATING only.</p>
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The intention is to create a <a href="https://martinfowler.com/bliki/CQRS.html#:~:text=CQRS%20stands%20for%20Command%20Query,you%20use%20to%20read%20information">CQRS(Command Query Responsibility Segregation)</a> pattern for interaction. This can increase scalability while reducing complexity in distributed systems. The takeaway is to create data-stores that are optimized for different types of interactions primarily writing and reading.
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<h4 id="_query">QUERY</h4>
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<p>A separate API and logically separate data-store is used to query business data. Updates to this data-store always happen in an asynchronous fashion. For example when a Approval task in the work flow completes the workflow publishes an UPDATE-SERVICE-REQUEST event. The subscriber reads the event and decides what to do. In certain cases it updates the object in the data-store. Other components can now read from the data-store such as the UI.</p>
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<p>We can guarantee the data is published to the data store with the workflow. See the section above on the JavaDelegates that implement the publishing functionality.</p>
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<p><a href="https://spring.io/blog/2011/02/10/getting-started-with-spring-data-jpa">Spring Data JPA</a> is the technology used for the ServiceRequest data. Spring Data allows for an easy way to create API’s that are easy for a UI to query. Also an easy way to combine data into a useful form for the UI to consume.</p>
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<h2 id="_patterns_for_integration"><a id="patterns-for-integration"></a>Patterns for Integration</h2>
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<p>It’s important to consider how to implement integrations with a workflow. Two basic patterns exist, integrate within the workflow execution or outside the workflow execution. The sections below provide details about the two patterns.</p>
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<h3 id="_access_to_the_workflow_execution_context"><a id="workflow-execution"></a>Access to the workflow execution context</h3>
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