/
SagaBuilder.java
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/
SagaBuilder.java
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package io.flowing.trip.saga.camunda.springboot.builder;
import org.camunda.bpm.model.bpmn.Bpmn;
import org.camunda.bpm.model.bpmn.BpmnModelInstance;
import org.camunda.bpm.model.bpmn.builder.AbstractActivityBuilder;
import org.camunda.bpm.model.bpmn.builder.AbstractFlowNodeBuilder;
import org.camunda.bpm.model.bpmn.builder.ProcessBuilder;
public class SagaBuilder {
@SuppressWarnings("rawtypes")
private AbstractFlowNodeBuilder saga;
private BpmnModelInstance bpmnModelInstance;
private String name;
private ProcessBuilder process;
public SagaBuilder(String name) {
this.name = name;
}
public static SagaBuilder newSaga(String name) {
SagaBuilder builder = new SagaBuilder(name);
return builder.start();
}
public BpmnModelInstance getModel() {
if (bpmnModelInstance==null) {
bpmnModelInstance = saga.done();
}
return bpmnModelInstance;
}
public SagaBuilder start() {
process = Bpmn.createExecutableProcess(name);
saga = process.startEvent("Start-" + name);
return this;
}
public SagaBuilder end() {
saga = saga.endEvent("End-" + name);
return this;
}
@SuppressWarnings("rawtypes")
public SagaBuilder activity(String name, Class adapterClass) {
// this is very handy and could also be done inline above directly
String id = "Activity-" + name.replace(" ", "-"); // risky thing ;-)
saga = saga.serviceTask(id).name(name).camundaClass(adapterClass.getName());
return this;
}
@SuppressWarnings("rawtypes")
public SagaBuilder compensationActivity(String name, Class adapterClass) {
if (!(saga instanceof AbstractActivityBuilder)) {
throw new RuntimeException("Compensation activity can only be specified right after activity");
}
String id = "Activity-" + name.replace(" ", "-") + "-compensation"; // risky thing ;-)
((AbstractActivityBuilder)saga)
.boundaryEvent()
.compensateEventDefinition()
.compensateEventDefinitionDone()
.compensationStart()
.serviceTask(id).name(name).camundaClass(adapterClass.getName())
.compensationDone();
return this;
}
public SagaBuilder triggerCompensationOnAnyError() {
process.eventSubProcess()
.startEvent("ErrorCatched").error("java.lang.Throwable")
.intermediateThrowEvent("ToBeCompensated").compensateEventDefinition().compensateEventDefinitionDone()
.endEvent("ErrorHandled");
return this;
}
}