Question

我试图在wso2 ESB 4.8中实现自定义中介。我使用this article作为参考，并且也引用了the docs，但无法让ESB识别我的中介的xml配置。

我按照文档中提到的所有步骤，将调解员的项目 .jar 移至ERROR - MediatorFactoryFinder Unknown mediator referenced by configuration element : {http://ws.apache.org/ns/synapse}currencyMediator并重新启动服务器，但在部署期间我一直收到以下错误：

package org.wso2.esb.tutorial.custom;

import java.util.Iterator;

import javax.xml.namespace.QName;

import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMNode;
import org.apache.axiom.soap.SOAPBody;
import org.apache.synapse.MessageContext;
import org.apache.synapse.mediators.AbstractMediator;


public class CurrencyMedXML extends AbstractMediator { 
    private String symbol = "$";

    public boolean mediate(MessageContext synCtx) { 

        // get symbol, last elements of SOAP envelope
        SOAPBody body = synCtx.getEnvelope().getBody();
        OMElement firstElement = body.getFirstElement();

        //Iterator it = firstElement.getChildren();
        Iterator it = firstElement.getChildrenWithName(new QName( "return"));
        while (it.hasNext()) {
            OMNode node = (OMNode)it.next();
            if (node.getType()==OMNode.ELEMENT_NODE) {
                OMElement ele=(OMElement)node;
                String text = ele.getText();
                ele.setText(symbol+text);
            }
        }


        return true;
    }

    public void setSymbol(String sym){
        symbol=sym;
    }

    public String getSymbol(){
        return symbol;
    }
}

以下是调解员代码：

package org.wso2.esb.tutorial.custom;

import org.apache.axiom.om.OMElement;
import org.apache.synapse.Mediator;
import org.apache.synapse.config.xml.AbstractMediatorSerializer;

public class CurrencyMedXMLSerializer extends AbstractMediatorSerializer {

    public String getMediatorClassName() {
        return CurrencyMedXML.class.getName();
    }

    @Override
    protected OMElement serializeSpecificMediator(Mediator m) {
        if (!(m instanceof CurrencyMedXML)) {
              handleException("Unsupported mediator passed in for serialization : "
                  + m.getType());
        }

        CurrencyMedXML mediator = (CurrencyMedXML) m;
        OMElement CurrencyMediatorElement = fac
            .createOMElement(CurrencyMedXMLFactory.CURRENCY_MEDIATOR_Q);

        saveTracingState(CurrencyMediatorElement, mediator);

        OMElement symbolElement = fac.createOMElement(CurrencyMedXMLFactory.SYMBOL_Q, CurrencyMediatorElement);
        symbolElement.setText(mediator.getSymbol());

        return CurrencyMediatorElement;
    }
}

序列化器实现：

package org.wso2.esb.tutorial.custom;

import java.util.Properties;

import javax.xml.namespace.QName;

import org.apache.axiom.om.OMElement;
import org.apache.synapse.Mediator;
import org.apache.synapse.SynapseException;
import org.apache.synapse.config.xml.AbstractMediatorFactory;
import org.apache.synapse.config.xml.XMLConfigConstants;

public class CurrencyMedXMLFactory extends AbstractMediatorFactory {

      static final QName CURRENCY_MEDIATOR_Q = new QName(
          XMLConfigConstants.SYNAPSE_NAMESPACE, "currencyMediator");

      static final QName SYMBOL_Q = new QName(
          XMLConfigConstants.SYNAPSE_NAMESPACE, "symbol");

      public QName getTagQName() {
        return CURRENCY_MEDIATOR_Q;
      }

    @Override
    protected Mediator createSpecificMediator(OMElement elem, Properties properties) {
        // create new mediator
          CurrencyMedXML newMediator = new CurrencyMedXML();

        // setup initial settings 
          processAuditStatus(newMediator, elem);

          OMElement symbolElement = elem.getFirstChildWithName(SYMBOL_Q);
          if (symbolElement != null) {
              String symbol = symbolElement.getText();
              newMediator.setSymbol(symbol);
          } else {
              throw new SynapseException("default percentage element missing");
          }

        return newMediator; 
    }
}

工厂实施：

<outSequence>
  <currencyMediator>
    <symbol>$</symbol>
  </currencyMediator>
  <send/>
</outSequence>

这是代理服务的一个片段，我引用自定义中介：

SELECT ItemCode, SUM(QuantityOrdered) AS Total_Quantity
FROM OrderDetail 
where DateField >= dateadd(month, -4, cast(getdate() as DATE)) 
GROUP BY ItemCode
ORDER BY SUM(QuantityOrdered) DESC;

Answer 1

我还没有尝试过自定义标记方法。但只是为了您的信息，您也可以像这样打电话给您的班级调解员。

__hash__

Answer 2

当我使用WSO2 Dev Studio创建自定义中介时，我遇到了同样的问题。可以找到更多信息here。

要解决这个问题，我必须使用maven从命令行构建中介。

希望有所帮助。

部署自定义介体时出现WSO2 ESB错误

2 个答案: