Flowable源码注释（七十二）子任务、流程任务活动行为

本文详细探讨了Flowable-6.7.2中ChildTaskActivityBehavior和ProcessTaskActivityBehavior两类，关注它们在流程任务活动中的具体行为。提供了源码注释的GitHub链接供读者深入研究。

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

ChildTaskActivityBehavior 子任务活动行为类

/**
 * 子任务活动行为类
 *
 * @author Tijs Rademakers
 * @author Joram Barrez
 */
public abstract class ChildTaskActivityBehavior extends CoreCmmnTriggerableActivityBehavior {
   
   

    private static final Logger LOGGER = LoggerFactory.getLogger(ChildTaskActivityBehavior.class);

    protected boolean isBlocking;
    protected String isBlockingExpression;
    protected List<IOParameter> inParameters;
    protected List<IOParameter> outParameters;

    public ChildTaskActivityBehavior(boolean isBlocking, String isBlockingExpression) {
   
   
        this.isBlocking = isBlocking;
        this.isBlockingExpression = isBlockingExpression;
    }

    public ChildTaskActivityBehavior(boolean isBlocking, String isBlockingExpression, List<IOParameter> inParameters, List<IOParameter> outParameters) {
   
   
        this(isBlocking, isBlockingExpression);
        this.inParameters = inParameters;
        this.outParameters = outParameters;
    }

    @Override
    public void execute(CommandContext commandContext, PlanItemInstanceEntity planItemInstanceEntity) {
   
   
        execute(commandContext, planItemInstanceEntity, null);
    }

    public abstract void execute(CommandContext commandContext, PlanItemInstanceEntity planItemInstanceEntity, VariableInfo variableInfo);

    protected boolean evaluateIsBlocking(DelegatePlanItemInstance planItemInstance) {
   
   
        boolean blocking = isBlocking;
        if (StringUtils.isNotEmpty(isBlockingExpression)) {
   
   
            Expression expression = CommandContextUtil.getExpressionManager().createExpression(isBlockingExpression);
            blocking = (Boolean) expression.getValue(planItemInstance);
        }
        return blocking;
    }

    @Override
    public void trigger(CommandContext commandContext, PlanItemInstanceEntity planItemInstance) {
   
   
        if (!PlanItemInstanceState.ACTIVE.equals(planItemInstance.getState())) {
   
   
            throw new FlowableIllegalStateException("Can only trigger a plan item that is in the ACTIVE state");
        }
        CommandContextUtil.getAgenda(commandContext).planCompletePlanItemInstanceOperation(planItemInstance);
    }

    protected void handleInParameters(PlanItemInstanceEntity planItemInstanceEntity,
                                      CmmnEngineConfiguration cmmnEngineConfiguration, Map<String, Object> inParametersMap,
                                      ExpressionManager expressionManager) {
   
   

        if (inParameters == null) {
   
   
            return;
        }

        for (IOParameter inParameter : inParameters) {
   
   

            String variableName = null;
            if (StringUtils.isNotEmpty(inParameter.getTargetExpression())) {
   
   
                Expression expression = cmmnEngineConfiguration.getExpressionManager().createExpression(inParameter.getTargetExpression());
                Object variableNameValue = expression.getValue(planItemInstanceEntity);
                if (variableNameValue != null) {
   
   
                    variableName = variableNameValue.toString();
                } else {
   
   
                    LOGGER.warn("In parameter target expression {} did not resolve to a variable name, this is most likely a programmatic error",
                            inParameter.getTargetExpression());
                }

            } else if (StringUtils.isNotEmpty(inParameter.getTarget())) {
   
   
                variableName = inParameter.getTarget();

            }

            Object variableValue = null;
            if (StringUtil