Flowable源码注释（四十九）子流程相关解析处理器

最新推荐文章于 2025-05-26 09:38:16 发布

jinyangjie0

最新推荐文章于 2025-05-26 09:38:16 发布

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分类专栏： Flowable源码注释文章标签： flowable 源码注释流程引擎

原文链接：https://github.com/flowable/flowable-engine

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本文深入探讨Flowable引擎中处理子流程的三个关键解析处理器：SubProcessParseHandler、EventSubProcessParseHandler和AdhocSubProcessParseHandler。通过源码注释，详细解析每个处理器的功能和在流程定义中的作用。

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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

子流程相关解析处理器，包路径：org.flowable.engine.impl.bpmn.parser.handler

SubProcessParseHandler 子流程解析处理器

/**
 * 子流程解析处理器
 *
 * @author Joram Barrez
 */
public class SubProcessParseHandler extends AbstractActivityBpmnParseHandler<SubProcess> {

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

    @Override
    protected void executeParse(BpmnParse bpmnParse, SubProcess subProcess) {

        // 策略模式，动态设置子流程解析行为
        subProcess.setBehavior(bpmnParse.getActivityBehaviorFactory().createSubprocessActivityBehavior(subProcess));

        bpmnParse.processFlowElements(subProcess.getFlowElements());
        processArtifacts(bpmnParse, subProcess.getArtifacts());

        // 没有用于事件子流程的数据对象
        /*
         * if (!(subProcess instanceof EventSubProcess)) { // parse out any data objects from the template in order to set up the necessary process variables Map<String, Object> variables =
         * processDataObjects(bpmnParse, subProcess.getDataObjects(), activity); activity.setVariables(variables); }
         * 
         * bpmnParse.removeCurrentScope(); bpmnParse.removeCurrentSubProcess();
         * 
         * if (subProcess.getIoSpecification() != null) { IOSpecification ioSpecification = createIOSpecification(bpmnParse, subProcess.getIoSpecification());
         * activity.setIoSpecification(ioSpecification); }
         */

    }

}

EventSubProcessParseHandler 事件子流程解析处理器

package org.flowable.engine.impl.bpmn.parser.handler;

import org.flowable.bpmn.model.BaseElement;
import org.flowable.bpmn.model.EventSubProcess;
import org.flowable.engine.impl.bpmn.parser.BpmnParse;

/**
 * 事件子流程解析处理器
 *
 * @author Joram Barrez
 */
public class EventSubProcessParseHandler extends AbstractActivityBpmnParseHandler<EventSubProcess> {

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

    @Override
    protected void executeParse(BpmnParse bpmnParse, EventSubProcess eventSubProcess) {
        eventSubProcess.setBehavior(bpmnParse.getActivityBehaviorFactory().createEventSubprocessActivityBehavior(eventSubProcess));
        bpmnParse.processFlowElements(eventSubProcess.getFlowElements());
        processArtifacts(bpmnParse, eventSubProcess.getArtifacts());
    }

}

AdhocSubProcessParseHandler 临时子进程解析处理器

package org.flowable.engine.impl.bpmn.parser.handler;

import org.flowable.bpmn.model.AdhocSubProcess;
import org.flowable.bpmn.model.BaseElement;
import org.flowable.bpmn.model.SubProcess;
import org.flowable.engine.impl.bpmn.parser.BpmnParse;

/**
 * 临时子进程解析处理器
 *
 * @author Tijs Rademakers
 */
public class AdhocSubProcessParseHandler extends AbstractActivityBpmnParseHandler<SubProcess> {

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

    @Override
    protected void executeParse(BpmnParse bpmnParse, SubProcess subProcess) {

        subProcess.setBehavior(bpmnParse.getActivityBehaviorFactory().createAdhocSubprocessActivityBehavior(subProcess));

        bpmnParse.processFlowElements(subProcess.getFlowElements());
        processArtifacts(bpmnParse, subProcess.getArtifacts());
    }

}