java - 如何在启动 mule 时自动运行一次流程？

Question

我有一个 java 类，它创建一个带有种子集合的干净的 MongoDB 数据库。它会自动识别数据库是否丢失并创建它。我想在启动 MuleEsb 时运行它。这样我就不需要记住在启动 mule 之前调用它。我希望将它放在流中并在 mule 启动时自动运行该流一次。

有没有办法在mule启动的时候做这个一次性的操作？

---更新---

根据下面的对话，我将以下内容添加到我的 mule 配置中，流程会自动触发。

<quartz:connector name="Quartz" validateConnections="true"/>

<flow name="testService1">
    <quartz:inbound-endpoint name="runOnce" repeatCount="0" repeatInterval="1" jobName="job1" connector-ref="Quartz">
        <quartz:event-generator-job>
            <quartz:payload>foo</quartz:payload>
        </quartz:event-generator-job>
    </quartz:inbound-endpoint>

    <logger message="INBOUND HEADERS = #[headers:inbound:*]" level="WARN"/>
</flow>

Answer 1

我一个月前创建了一个 JIRA 来请求这样的功能:http://www.mulesoft.org/jira/browse/MULE-6877

现在，您可以使用一个技巧:a Quartz inbound endpoint with an event generator job repeatCount = 0 只会在启动时触发您的流程一次。

或者，您可以监听上下文事件并在触发特定事件时调用流。下面显示了一个调用启动和关闭流程的监听器:

package com.acme;

import org.mule.DefaultMuleEvent;
import org.mule.DefaultMuleMessage;
import org.mule.MessageExchangePattern;
import org.mule.api.MuleException;
import org.mule.api.MuleRuntimeException;
import org.mule.api.context.notification.MuleContextNotificationListener;
import org.mule.config.i18n.MessageFactory;
import org.mule.construct.Flow;
import org.mule.context.notification.MuleContextNotification;

public class FlowInvokingContextListener implements MuleContextNotificationListener<MuleContextNotification>
{
    private Flow startingFlow;
    private Flow stoppingFlow;

    public void onNotification(final MuleContextNotification notification)
    {
        if (notification.getAction() == MuleContextNotification.CONTEXT_STARTED)
        {
            sendNotificationToFlow(notification, startingFlow);
        }
        else if (notification.getAction() == MuleContextNotification.CONTEXT_STOPPING)
        {
            sendNotificationToFlow(notification, stoppingFlow);
        }
    }

    private void sendNotificationToFlow(final MuleContextNotification notification, final Flow flow)
    {
        try
        {
            final DefaultMuleEvent event = new DefaultMuleEvent(new DefaultMuleMessage(notification,
                notification.getMuleContext()), MessageExchangePattern.REQUEST_RESPONSE, startingFlow);
            flow.process(event);
        }
        catch (final MuleException me)
        {
            throw new MuleRuntimeException(MessageFactory.createStaticMessage("Failed to invoke: "
                                                                              + startingFlow), me);
        }
    }

    public void setStartingFlow(final Flow startingFlow)
    {
        this.startingFlow = startingFlow;
    }

    public void setStoppingFlow(final Flow stoppingFlow)
    {
        this.stoppingFlow = stoppingFlow;
    }
}

配置:

<spring:beans>
    <spring:bean name="flowInvokingContextListener"
        class="com.acme.FlowInvokingContextListener"
        p:startingFlow-ref="startFlow" p:stoppingFlow-ref="stopFlow" />
</spring:beans>

<notifications>
    <notification event="CONTEXT" />
    <notification-listener ref="flowInvokingContextListener" />
</notifications>