骆驼蓝图：标头中的枚举值

Question

    <route id="doOperationARoute">
        <from uri="timer://MNG?delay=5s&amp;repeatCount=1" />
        <setHeader headerName="operationName">
            <simple>${type:my.pkg.EnumOperations.OP_A}</simple>
        </setHeader>
        <log message="${headers}" />
        <to uri="bean:myProcessor" />
    </route>

 package my.pkg;
 public enum EnumOperations{
    OP_A
 }

public class MyProcessor implements Processor{
    @Override
    public void process(Exchange exc) throws Exception {

        //HERE I RECEIVE THE CAST ERROR (String cannot be casted to EnumOperation)
        EnumOperations operation=(EnumOperations)exc.getIn().getHeader("operationName");

        switch (operation) {
        case OP_A: 
            break;
        default:
            break;  
        }   
    }
}

Answer 1

您可以通过两种方式来实现这一点：

1）在proccessor中获取具有类类型的headr

EnumOperations operation = exc.getIn().getHeader("operationName", EnumOperations.class);

2）如果Camel Proccessor使用bean，则使用@header传递枚举

class Bean {

   public void methodName (@Header("operationName") EnumOperations operation){
     switch (operation) {
        case OP_A: 
            break;
        default:
            break;  
        }   
   }