Question

我保持我的一个流量说＆＃39;流动A＆＃39;在＆＃34;停止＆＃34;作为初始状态。然后在另一个流程中说流程B＆＃39;使用groovy脚本或MEL表达;我正在开始同样的流程A＆＃39;。在流程A＆＃39;的最后，我以编程方式停止流程。

现在，如果我再次启动流程A＆＃39;通过＆＃39;流程B＆＃39;它没有说'＆＃39;流A＆＃39;已经开始了;无法重新启动。

任何解决方案。

我想随时开始流动，保持初始状态为停止状态。最后再次使用脚本停止流程。

以下是代码：

<flow name="FlowB">
    <poll doc:name="Poll">
        <logger level="INFO" doc:name="Logger"/>
    </poll>
    <logger level="INFO" doc:name="Logger" message="triggered"/>
    <scripting:component doc:name="Groovy">
        <scripting:script engine="Groovy"><![CDATA[muleContext.registry.lookupFlowConstruct('FlowB').start()]]></scripting:script>
    </scripting:component>
    <logger level="INFO" doc:name="Logger"/>
    <expression-component doc:name="Expression"><![CDATA[app.registry.FlowA.stop();]]></expression-component>
</flow>
<flow name="FlowA" initialState="stopped">
    <sqs:receive-messages config-ref="Amazon_SQS__Configuration" doc:name="Amazon SQS (Streaming)"/>
    <logger level="INFO" doc:name="Logger"/>
</flow>

我正在使用poller启动流程A.所以，如果我再次运行流程B来启动流程A;它抛出异常。

Answer 1

停止flowA无效（无论出于何种原因）或您在停止后立即尝试启动flowA。 AFAIK启动/停止是异步发生的，这意味着即使已经返回了stop（）方法，flowA也可能处于启动状态。

这是一个展示/stop和/start http-endpoints的工作示例。

<mule xmlns:scripting="http://www.mulesoft.org/schema/mule/scripting" xmlns:tracking="http://www.mulesoft.org/schema/mule/ee/tracking" xmlns:http="http://www.mulesoft.org/schema/mule/http" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
    xmlns:spring="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/http http://www.mulesoft.org/schema/mule/http/current/mule-http.xsd
http://www.mulesoft.org/schema/mule/ee/tracking http://www.mulesoft.org/schema/mule/ee/tracking/current/mule-tracking-ee.xsd
http://www.mulesoft.org/schema/mule/scripting http://www.mulesoft.org/schema/mule/scripting/current/mule-scripting.xsd">
    <http:listener-config name="HTTP_Listener_Configuration" host="0.0.0.0" port="8081" doc:name="HTTP Listener Configuration"/>

    <flow name="flowA">
        <logger message="foobar" level="INFO" doc:name="Logger"/>
    </flow>

    <flow name="flowB_start">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/start" doc:name="HTTP"/>
        <expression-transformer expression="#[groovy:muleContext.registry.get('flowA').start()]" doc:name="Expression"/>
    </flow>

    <flow name="flowB_stop">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/stop" doc:name="HTTP"/>
        <expression-transformer expression="#[groovy:muleContext.registry.get('flowA').stop()]" doc:name="Expression"/>
    </flow>
</mule>

我可以随时开始/停止flowA。

Answer 2

这很容易处理，而且非常简单。您可以使用If else条件来控制它。如果FlowA已经启动，它将忽略，否则它将从以下开始。

  <flow name="flowA" initialState="stopped">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/flowA" doc:name="HTTP"/>
        <logger message="In flow A" level="INFO" doc:name="Logger"/>
    </flow>

    <flow name="flowB">
        <http:listener config-ref="HTTP_Listener_Configuration" path="/flowB" doc:name="HTTP"/>
        <scripting:component>
    <scripting:script engine="groovy">
    if(muleContext.registry.lookupFlowConstruct('flowA').isStarted())
    {
    System.out.println("flowA already started ... ignoring and do nothing")
    }
    else
    {
      muleContext.registry.lookupFlowConstruct('flowA').start()
     }
    </scripting:script>
</scripting:component>
    </flow>

<强>更新

<flow name="FlowB">
    <poll doc:name="Poll">
        <fixed-frequency-scheduler frequency="3000" />
        <logger level="INFO" doc:name="Logger" message="FlowB" />
    </poll>
    <logger message="test" level="INFO" doc:name="Logger" />

    <scripting:component doc:name="Script">
        <scripting:script engine="groovy"><![CDATA[
if(muleContext.registry.lookupFlowConstruct('FlowA').isStarted())
{
System.out.println("flowA already started ... ignoring and do nothing")
}
else
{
  muleContext.registry.lookupFlowConstruct('FlowA').start()
 }]]>
        </scripting:script>
    </scripting:component>

    <flow-ref name="FlowA" doc:name="FlowA" />
    <expression-component doc:name="Expression"><![CDATA[app.registry.FlowA.stop();]]></expression-component>
</flow>


<flow name="FlowA" initialState="stopped">
    <http:listener config-ref="HTTP_Listener_Configuration" path="/test" doc:name="HTTP" />
    <logger level="INFO" doc:name="Logger" message="In flowA" />
</flow>

以编程方式启动/停止mule流

2 个答案: