Orchestrate Minecraft with BPMN and JavaScript!
The Camunda Engine embedded in a Minecraft plugin for Bukkit-compatible Minecraft servers.
The plugin has a single delegate method for task execution. The executor uses a field injection named delegate from a service task.
It uses the value of this field to look up a JavaScript handler in a map.
Any .bpmn and .js files in plugins/CamundaPlugin will be loaded. Take a look at the files in test-data for the format of the .js file.
Register the handlers using the registerHandler(name, code) method. See the example below.
If you have docker and npm installed, it is easy to test using the Scriptcraft Modular Architecture image.
Run:
npm i -g smac
mvn package
smac
This will start a Minecraft server in Docker and mount the plugin into it.
It will pipe the server log to your terminal, and - bonus! - give you an interactive session.
When the server finishes booting, type: ts on. This turns the terminal into a TypeScript REPL on the server. Magic.
Now paste these commands in:
const xml = `<?xml version="1.0" encoding="UTF-8"?><bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="Definitions_0fr9mxs" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="3.5.0"><bpmn:process id="my-project-process" isExecutable="true"><bpmn:endEvent id="EndEvent_0x6ir2l"><bpmn:incoming>SequenceFlow_0krhw54</bpmn:incoming></bpmn:endEvent><bpmn:startEvent id="StartEvent_1"><bpmn:outgoing>SequenceFlow_0tmt5j8</bpmn:outgoing></bpmn:startEvent><bpmn:sequenceFlow id="SequenceFlow_0tmt5j8" sourceRef="StartEvent_1" targetRef="say-hello" /><bpmn:sequenceFlow id="SequenceFlow_0krhw54" sourceRef="say-hello" targetRef="EndEvent_0x6ir2l" /><bpmn:serviceTask id="say-hello" name="Say Hello" camunda:class="io.magikcraft.camunda.Executor"><bpmn:extensionElements><camunda:field name="delegate"><camunda:string>someFunction</camunda:string></camunda:field></bpmn:extensionElements><bpmn:incoming>SequenceFlow_0tmt5j8</bpmn:incoming><bpmn:outgoing>SequenceFlow_0krhw54</bpmn:outgoing></bpmn:serviceTask></bpmn:process><bpmndi:BPMNDiagram id="BPMNDiagram_1"><bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="my-project-process"><bpmndi:BPMNShape id="EndEvent_0x6ir2l_di" bpmnElement="EndEvent_0x6ir2l"><dc:Bounds x="432" y="99" width="36" height="36" /></bpmndi:BPMNShape><bpmndi:BPMNShape id="StartEvent_0mjamr5_di" bpmnElement="StartEvent_1"><dc:Bounds x="179" y="99" width="36" height="36" /></bpmndi:BPMNShape><bpmndi:BPMNEdge id="SequenceFlow_0tmt5j8_di" bpmnElement="SequenceFlow_0tmt5j8"><di:waypoint x="215" y="117" /><di:waypoint x="270" y="117" /></bpmndi:BPMNEdge><bpmndi:BPMNEdge id="SequenceFlow_0krhw54_di" bpmnElement="SequenceFlow_0krhw54"><di:waypoint x="370" y="117" /><di:waypoint x="432" y="117" /></bpmndi:BPMNEdge><bpmndi:BPMNShape id="ServiceTask_07166wq_di" bpmnElement="say-hello"><dc:Bounds x="270" y="77" width="100" height="80" /></bpmndi:BPMNShape></bpmndi:BPMNPlane></bpmndi:BPMNDiagram></bpmn:definitions>`
const c = server.getPluginManager().getPlugin("CamundaPlugin")
c.registerHandler("someFunction", "function(execution) { var process = execution.getProcessInstanceId(); __plugin.logger.info('Yay!!! The job handler was called from process instance ' + process )}")
c.deployBpmn("model.bpmn", xml);
c.runtimeService.createProcessInstanceByKey("my-project-process").execute()You will see the handler execute:
[02:14:06 INFO]: [CamundaPlugin] Yay!!! The job handler was called from process instance 24
Epico!
To shut down the server, type: smac stop.