Question

我已经实现了通过camunda http连接器从camunda bpmn调用http REST端点的实现。

在这种情况下，首先，将调用BpmnInvoker REST端点，并提供bpmnProcessId作为路径参数，并将Authorization键作为标头参数与requestBody一起使用然后在BpmnInvoker中，将通过requestBody值调用相关的bpmn图。在这些bpmn任务中，将有一些服务任务将调用REST端点。

要从BPMN图中调用REST端点，我使用camunda http连接器。在这种情况下，我需要将Authorization密钥作为http头传递给REST端点。

为此，我将Authorization键添加到变量映射中，并将其作为bpmn图中的变量，然后添加到镜像和bpmn图中提到的标头Map中。

但是问题在于，该授权的长度通常超过4000个字符。因此，不能通过camunda引擎将其作为String传递。我尝试将其转换为另一个对象（例如：byte [] / StringBuffer等），假设它将存储为blob，但是在这种情况下，当它打算分配给http标头时，它会给出Class Cast Exception。

如何在Camunda做到这一点？
是否有不将这些对象存储在DB中的问题？
我注意到有一些选项可以更改列键入文本CLOB /增加大小等。这是个好主意吗？

BPMNInvoke.java

@Path("/base")
public class BpmnInvoker {

    ProcessEngine defaultProcessEngine = BpmPlatform.getProcessEngineService().getDefaultProcessEngine();
    RuntimeService runtimeService = defaultProcessEngine.getRuntimeService();

    @POST
    @Path("/path/{bpmnProcessId}")
    public Response start(@PathParam("bpmnProcessId") String bpmnProcessId, String requestBody, @HeaderParam("Authorization") String authorization) {

        Map<String, Object> variableMap = new HashMap<String, Object>();
        variableMap = IntegrationUtility.convertJSONStringToMap(requestBody);

        // Set the Authorization token to the variable map. 
        // Normally this is more than 4000 characters long dynamic key. 
        // It must be set as a http header value when invoking REST endpoint via http connector.
        variableMap.put("Authorization", authorization);

        // Invoke the bpmn diagram by calling the startProcessInstanceByKey on runtimeService.
        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey(bpmnProcessId, variableMap);

        // rest of the work after completing the process engine
    }

}

BPMN图

----
----
    <bpmn:serviceTask id="Task_1ujngj7" name="Dummy Service 2">
      <bpmn:extensionElements>
        <camunda:connector>
          <camunda:inputOutput>
            <camunda:inputParameter name="url">http://localhost:8080/x-services/path/to/rest/service</camunda:inputParameter>
            <camunda:inputParameter name="method">POST</camunda:inputParameter>
            <camunda:inputParameter name="headers">
              <camunda:map>
                <camunda:entry key="Authorization">${Authorization}</camunda:entry>
                <camunda:entry key="Content-Type">application/json</camunda:entry>
              </camunda:map>
            </camunda:inputParameter>
            <camunda:inputParameter name="payload">${payload}</camunda:inputParameter>
            <camunda:outputParameter name="payload">${response}</camunda:outputParameter>
          </camunda:inputOutput>
          <camunda:connectorId>http-connector</camunda:connectorId>
        </camunda:connector>
      </bpmn:extensionElements>
      <bpmn:incoming>SequenceFlow_0w4wfbo</bpmn:incoming>
      <bpmn:outgoing>SequenceFlow_153ti9s</bpmn:outgoing>
    </bpmn:serviceTask>
    <bpmn:sequenceFlow id="SequenceFlow_1kvov2r" sourceRef="Task_0i9s02e" targetRef="EndEvent_0o062nq" />
    <bpmn:serviceTask id="Task_0i9s02e" name="DummyServiceClear" camunda:delegateExpression="${dummyServiceClear}">
      <bpmn:incoming>SequenceFlow_153ti9s</bpmn:incoming>
      <bpmn:outgoing>SequenceFlow_1kvov2r</bpmn:outgoing>
    </bpmn:serviceTask>
----
----

Answer 1

尝试一下：

import org.camunda.bpm.engine.variable.Variables;
import org.camunda.bpm.engine.variable.Variables.SerializationDataFormats;

variableMap.put("Authorization", Variables
                              .objectValue(authorization)
                                  // tells the engine to use java serialization for persisting the value 
                              .serializationDataFormat(SerializationDataFormats.JAVA)  
                              .create());

在Camunda BPMN引擎中传递冗长的文本-HTTP连接器

1 个答案: