Flowable源码注释（五十三）事件解析处理器（下）

本文深入解析Flowable流程引擎中的事件处理，包括条件事件、错误事件、定时器事件、变量监听器事件和升级事件的定义解析处理器。通过源码注释，详细介绍了每个处理器在流程中的作用和实现原理。

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Flowable源码地址：https://github.com/flowable/flowable-engine

Flowable-6.7.2 源码注释地址：https://github.com/solojin/flowable-6.7.2-annotated

事件解析处理器，包路径：org.flowable.engine.impl.bpmn.parser.handler

ConditionalEventDefinitionParseHandler 条件事件定义解析器

/**
 * 条件事件定义解析器
 *
 * @author Tijs Rademakers
 */
public class ConditionalEventDefinitionParseHandler extends AbstractBpmnParseHandler<ConditionalEventDefinition> {

    @Override
    public Class<? extends BaseElement> getHandledType() {
        return ConditionalEventDefinition.class;
    }

    @Override
    protected void executeParse(BpmnParse bpmnParse, ConditionalEventDefinition eventDefinition) {
        if (bpmnParse.getCurrentFlowElement() instanceof IntermediateCatchEvent) {
            IntermediateCatchEvent intermediateCatchEvent = (IntermediateCatchEvent) bpmnParse.getCurrentFlowElement();
            intermediateCatchEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createIntermediateCatchConditionalEventActivityBehavior(
                            intermediateCatchEvent, eventDefinition, eventDefinition.getConditionExpression()));
            
        } else if (bpmnParse.getCurrentFlowElement() instanceof BoundaryEvent) {
            BoundaryEvent boundaryEvent = (BoundaryEvent) bpmnParse.getCurrentFlowElement();
            
            boundaryEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createBoundaryConditionalEventActivityBehavior(boundaryEvent, 
                                eventDefinition, eventDefinition.getConditionExpression(), boundaryEvent.isCancelActivity()));
        }
    }
}

ErrorEventDefinitionParseHandler 错误事件解析处理器

/**
 * 错误事件解析处理器
 *
 * @author Joram Barrez
 * @author Tijs Rademakers
 */
public class ErrorEventDefinitionParseHandler extends AbstractBpmnParseHandler<ErrorEventDefinition> {

    @Override
    public Class<? extends BaseElement> getHandledType() {
        return ErrorEventDefinition.class;
    }

    @Override
    protected void executeParse(BpmnParse bpmnParse, ErrorEventDefinition eventDefinition) {
        if (bpmnParse.getCurrentFlowElement() instanceof BoundaryEvent) {
            BoundaryEvent boundaryEvent = (BoundaryEvent) bpmnParse.getCurrentFlowElement();
            boundaryEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createBoundaryEventActivityBehavior(boundaryEvent, true));
        }
    }
}

TimerEventDefinitionParseHandler 定时器定义解析处理器

/**
 * 定时器定义解析处理器
 *
 * @author Joram Barrez
 */
public class TimerEventDefinitionParseHandler extends AbstractBpmnParseHandler<TimerEventDefinition> {

    @Override
    public Class<? extends BaseElement> getHandledType() {
        return TimerEventDefinition.class;
    }

    @Override
    protected void executeParse(BpmnParse bpmnParse, TimerEventDefinition timerEventDefinition) {

        if (bpmnParse.getCurrentFlowElement() instanceof IntermediateCatchEvent) {

            IntermediateCatchEvent intermediateCatchEvent = (IntermediateCatchEvent) bpmnParse.getCurrentFlowElement();
            intermediateCatchEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createIntermediateCatchTimerEventActivityBehavior(intermediateCatchEvent, timerEventDefinition));

        } else if (bpmnParse.getCurrentFlowElement() instanceof BoundaryEvent) {

            BoundaryEvent boundaryEvent = (BoundaryEvent) bpmnParse.getCurrentFlowElement();
            boundaryEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createBoundaryTimerEventActivityBehavior(boundaryEvent, timerEventDefinition, boundaryEvent.isCancelActivity()));
        }
    }
}

VariableListenerEventDefinitionParseHandler 变量监听器事件定义解析处理器

/**
 * 变量监听器事件定义解析处理器
 *
 * @author Joram Barrez
 * @author Tijs Rademakers
 */
public class VariableListenerEventDefinitionParseHandler extends AbstractBpmnParseHandler<VariableListenerEventDefinition> {

    @Override
    public Class<? extends BaseElement> getHandledType() {
        return VariableListenerEventDefinition.class;
    }

    @Override
    protected void executeParse(BpmnParse bpmnParse, VariableListenerEventDefinition variableListenerEventDefinition) {

        if (bpmnParse.getCurrentFlowElement() instanceof IntermediateCatchEvent) {
            IntermediateCatchEvent intermediateCatchEvent = (IntermediateCatchEvent) bpmnParse.getCurrentFlowElement();
            intermediateCatchEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createIntermediateCatchVariableListenerEventActivityBehavior(intermediateCatchEvent, variableListenerEventDefinition));

        } else if (bpmnParse.getCurrentFlowElement() instanceof BoundaryEvent) {
            BoundaryEvent boundaryEvent = (BoundaryEvent) bpmnParse.getCurrentFlowElement();
            boundaryEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createBoundaryVariableListenerEventActivityBehavior(boundaryEvent, variableListenerEventDefinition, boundaryEvent.isCancelActivity()));
        }
    }
}

EscalationEventDefinitionParseHandler 升级事件定义解析处理器

/**
 * 升级事件定义解析处理器
 *
 * @author Tijs Rademakers
 */
public class EscalationEventDefinitionParseHandler extends AbstractBpmnParseHandler<EscalationEventDefinition> {

    @Override
    public Class<? extends BaseElement> getHandledType() {
        return EscalationEventDefinition.class;
    }

    @Override
    protected void executeParse(BpmnParse bpmnParse, EscalationEventDefinition eventDefinition) {
        if (bpmnParse.getCurrentFlowElement() instanceof BoundaryEvent) {
            BoundaryEvent boundaryEvent = (BoundaryEvent) bpmnParse.getCurrentFlowElement();
            
            Escalation escalation = null;
            if (bpmnParse.getBpmnModel().containsEscalationRef(eventDefinition.getEscalationCode())) {
                escalation = bpmnParse.getBpmnModel().getEscalation(eventDefinition.getEscalationCode());
            }
            
            boundaryEvent.setBehavior(bpmnParse.getActivityBehaviorFactory().createBoundaryEscalationEventActivityBehavior(boundaryEvent, 
                                eventDefinition, escalation, boundaryEvent.isCancelActivity()));
        }
    }
}