java - jBPM 6.2 - 如何获取当前分配任务的传出转换

Question

我是 jBPM 的新手，正在努力寻找为当前用户任务拉出可用传出转换的方法。例如，如果我的工作流程为:

现在，如果我被分配了一项审阅任务，我可以选择修改、拒绝或批准它。我想要做的是动态地提取可用的传出转换(修订、拒绝、批准)并向用户显示它从任何 jBPM 服务动态地对任务采取操作。请指导我。

Answer 1

您想要获取下一个不同网关节点的转换。

首先，您必须获取 Activity 节点(请注意，根据工作流程的复杂性，可能有多个 Activity 节点)

public static List<Node> getProcessActiveNodeList(final StatefulKnowledgeSession inSession,
                                                                 final WorkflowProcessInstanceImpl inInstance) {
    final List<Node> nodes = new ArrayList<>();
    final WorkflowProcess process = (WorkflowProcess) inSession.getKnowledgeBase().getProcess(inInstance.getProcessId());
    for (Node node : process.getNodes()) {
        if (node instanceof EventNode && ((EventNode) node).getFrom() == null) {
            // a free-standing event, without an entry point;  this would be a start of an "optional" branch
            nodes.add(node);
        } else {
            // a node that has an inbound connection;  all nodes on the main branch are of this kind
            List<NodeInstance> nodeInstances = inInstance.getNodeInstances(node.getId());
            if (nodeInstances != null && !nodeInstances.isEmpty()) {
                for (NodeInstance nodeInstance : nodeInstances) {
                    Node nodeInstanceNode = process.getNode(nodeInstance.getNodeId());
                    nodes.add(0, nodeInstanceNode);
                }
            }
        }
    }
    return nodes;
}

接下来您需要获取下一个不同网关节点的约束:

public static Map<ConnectionRef, Constraint> getNextGatewayConstraints(final StatefulKnowledgeSession inSession,
                                                                       final WorkflowProcessInstanceImpl inInstance,
                                                                       final Node inTaskNode) {
    final Map<ConnectionRef, Constraint> constraints = new HashMap<>();
    final WorkflowProcess process = (WorkflowProcess) inSession.getKnowledgeBase().getProcess(inInstance.getProcessId());
    for (Node node : process.getNodes()) {
        if (!node.equals(inTaskNode)) {
            continue;
        }
        final List<Connection> nodeConnections = node.getOutgoingConnections(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE);
        if (nodeConnections != null && !nodeConnections.isEmpty()) {
            for (Connection c : nodeConnections) {
                final Node nextNode = c.getTo();
                if (nextNode instanceof Split) {
                    constraints.putAll(((Split) nextNode).getConstraints());
                    return constraints;
                }
            }
        }
        break;
    }
    return constraints;
}

每个 ConnectionRef 都指向一个 Node，并且 Constraint 应包含条件(修订、拒绝、接受)