Apache Camel : ValidatingProcessor : XSD validation

Question

---

我正在尝试创建一个捆绑包，并在ServiceMix中运行它。我遇到了一个问题，任何帮助都将不胜感激。

我想做的事情：

从CXF端点生成SOAP消息，并使用Apache ServiceMix 5.0.0(Camel 2.12.3(根据XSD模式验证它们

我所做的：

实现了一个路由，该路由从CXF端点生成消息，然后对其进行验证。

路线的configure方法：

private RouteBuilder getInputRoute() {
    SoapValidatingProcessor soapValidatingProcessor = new SoapValidatingProcessor();
    inputRoute = new RouteBuilder() {
      @Override
      public void configure() throws Exception {
        from(cxfEndpointInId())
          .convertBodyTo(java.lang.String.class, "UTF-8")
          .onException(org.apache.camel.ValidationException.class)
            .log(LoggingLevel.INFO, LOG_NAME, "Invalid message received!")
            .handled(true)
            .stop()
            .end()
          .bean(soapValidatingProcessor).id("SoapHeaderValidatingProcessor")
          .to("browse:foo")
}

创建了一个验证处理器：

public class SoapValidatingProcessor {
  private final String SCHEMA = "schema.xsd";  
  public SoapValidatingProcessor() {
    validatingProcessor = new ValidatingProcessor();
    validatingProcessor.setFailOnNullHeader(false);
    validatingProcessor.setFailOnNullBody(false);
  }
  @Handler
  public void validate(Exchange exchange) throws Exception {
    Resource validationSchema = context.getApplicationContext().getResource(SCHEMA);
    validatingProcessor.setSchemaUrl(validationSchema.getURL());
    validatingProcessor.loadSchema();
    /* Creating a new SchemaFactory instance */
    SchemaFactory xmlSchema = SchemaFactory
        .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);   
    validatingProcessor.setSchemaFactory(xmlSchema);    
    validatingProcessor.process(exchange);
  }
}

问题：

Apache Camel验证处理器[1]在多重威胁中表现不佳。我正在按约发送SOAP消息。间隔20ms，我得到以下异常。如果我把发送间隔增加到200毫秒以上，那就很好了。

2014-07-11 17:11:47,404 | WARN  | ult-workqueue-18 | PhaseInterceptorChain            | ?                                   ? | 129 - org.ap
ache.cxf.cxf-api - 2.7.10 | Application {http://ws.service}WSImplService#{http://foo.bar}Update has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: FWK005 parse may not be called while parsing.
        at org.apache.camel.component.cxf.CxfConsumer$1.checkFailure(CxfConsumer.java:228)[181:org.apache.camel.camel-cxf:2.12.3]
        at org.apache.camel.component.cxf.CxfConsumer$1.setResponseBack(CxfConsumer.java:206)[181:org.apache.camel.camel-cxf:2.12.3]
        at org.apache.camel.component.cxf.CxfConsumer$1.syncInvoke(CxfConsumer.java:140)[181:org.apache.camel.camel-cxf:2.12.3]
        at org.apache.camel.component.cxf.CxfConsumer$1.invoke(CxfConsumer.java:75)[181:org.apache.camel.camel-cxf:2.12.3]
        at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)[129:org.apache.cxf.cxf-api:2.7.10]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)[:1.7.0_45]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)[:1.7.0_45]
        at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37)[129:org.apache.cxf.cxf-api:2.7.10]
        at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:107)[129:org.apache.cxf.cxf-api
:2.7.10]
        at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:272)[129:org.apache.cxf.cxf-api:2.7.10]
        at org.apache.cxf.phase.PhaseInterceptorChain.resume(PhaseInterceptorChain.java:242)[129:org.apache.cxf.cxf-api:2.7.10]
        at org.apache.cxf.interceptor.OneWayProcessorInterceptor$1.run(OneWayProcessorInterceptor.java:144)[129:org.apache.cxf.cxf-api:2.7.1
0]
        at org.apache.cxf.workqueue.AutomaticWorkQueueImpl$3.run(AutomaticWorkQueueImpl.java:428)[129:org.apache.cxf.cxf-api:2.7.10]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[:1.7.0_45]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[:1.7.0_45]
        at org.apache.cxf.workqueue.AutomaticWorkQueueImpl$AWQThreadFactory$1.run(AutomaticWorkQueueImpl.java:353)[129:org.apache.cxf.cxf-ap
i:2.7.10]
        at java.lang.Thread.run(Thread.java:744)[:1.7.0_45]
Caused by: org.xml.sax.SAXException: FWK005 parse may not be called while parsing.
        at org.apache.xerces.jaxp.validation.Util.toSAXException(Unknown Source)[:]

唯一不会得到异常的方法是如果validate方法是synchronized，但我不希望这样。

我发现：

我在这里看到[2]错误已经解决。我尝试为每条消息创建一个新的SchemaFactory[3]实例，但仍然没有成功。你知道为什么我仍然会出错吗？我做错了什么？

[1]http://camel.apache.org/maven/camel-2.8.0/camel-core/apidocs/org/apache/camel/processor/validation/ValidatingProcessor.html

[2]https://issues.apache.org/jira/browse/CAMEL-6630

[3]http://docs.oracle.com/javase/6/docs/api/javax/xml/validation/SchemaFactory.html

谢谢！

Answer 1

您的代码不是线程安全的。在SoapValidatingProcessor中，您使用共享validatingProcessor，同时修改其状态/配置(通过每次加载不同的模式(。

然而，在您的示例中，模式并没有改变。在这种情况下，您应该只配置处理器一次(通过在启动时加载架构(。

您的处理程序应该只调用不修改处理器状态的方法：

@Handler
public void validate(Exchange exchange) throws Exception {
    validatingProcessor.process(exchange);
}

在处理任何交换之前，状态应该配置一次，例如：

public SoapValidatingProcessor(CamelContext context) {
    validatingProcessor = new ValidatingProcessor();
    validatingProcessor.setFailOnNullHeader(false);
    validatingProcessor.setFailOnNullBody(false);
    Resource validationSchema = context.getApplicationContext().getResource(SCHEMA);
    validatingProcessor.setSchemaUrl(validationSchema.getURL());
    validatingProcessor.loadSchema();
    /* Creating a new SchemaFactory instance */
    SchemaFactory xmlSchema = SchemaFactory
        .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);   
    validatingProcessor.setSchemaFactory(xmlSchema);    
}

事实上，删除SoapValidatingProcessor类并将所有validatingProcessor配置移动到RouteBuilder.configure()方法中，然后直接在路由中使用validatingProcessor可能会更好。