我目前正在尝试设置一个 Web 服务端点（在 JBoss AS 6.1.0.FINAL 环境中），以使客户端能够长轮询服务器端事件，而不会阻塞服务器端的侦听器线程。
由于似乎没有标准解决方案，我发现这篇关于 CXF 延续的博客文章（旁边是 JBoss 中的 WS-Impl.）。
我可以将示例传输为 JAX-WS
import javax.annotation.Resource;
import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.servlet.annotation.WebServlet;
import javax.xml.ws.BindingType;
import javax.xml.ws.WebServiceContext;
import javax.xml.ws.handler.MessageContext;
import org.apache.cxf.continuations.Continuation;
import org.apache.cxf.continuations.ContinuationProvider;
@BindingType(javax.xml.ws.soap.SOAPBinding.SOAP12HTTP_BINDING)
@WebServlet(asyncSupported = true, urlPatterns = "/LongpollWebservice")
@WebService(targetNamespace = "http://longpoll.edu/", name = "LongpollWebservice", serviceName = "LongpollWebservice", portName = "LongpollWebservice")
public class LongpollWebserviceImpl implements LongpollWebservice {
@Resource
WebServiceContext ctx;
@Override
@WebMethod
public List<EventBase> getEvents(String topic, Date since) {
final ContinuationProvider cp = (ContinuationProvider) ctx.getMessageContext().get(ContinuationProvider.class.getName());
final Continuation c = cp.getContinuation();
if (c.isNew()) {
c.suspend(10000);
return null;
} else {
return Collections.emptyList();
}
}
}
延续 API 来自
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-api</artifactId>
<version>2.3.1</version>
<scope>provided</scope>
</dependency>
这是一个简化的例子。的调用c.suspend(10000);应该将当前的 servlet 调用标记为 State.SUSPENDED。十秒后，暂停应该超时，并且应该重新调用请求c.isNew() == false。（在现实世界的示例中，Continuation 可以传递给 JMS-Listener Bean 或有状态的 CDI-Eventlistener，并且c.setObject(event); c.resume();一旦事件可用并准备好交付，就会由事件调度程序调用）
CXF 拦截器链应该中断正在执行的线程SuspendedInvocationException并重新安排 web 服务调用。到目前为止，它在 JBoss 6.1.0 FINAL 上编译和部署良好。wsdl 完美交付。
但是：当我从 Webservice-Client 调用 getEvents() 时，SuspendedInvocationException似乎没有被正确捕获。整个调用因以下堆栈跟踪而崩溃：
14:39:59,578 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/longpoll-warfacade].[edu.hsos.dwe.wss.longpoll.warfacade.LongpollWebserviceImpl]] Servlet.service() for servlet edu.hsos.dwe.wss.longpoll.warfacade.LongpollWebserviceImpl threw exception: org.apache.cxf.continuations.SuspendedInvocationException
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:258) [:2.3.1-patch-01]
at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:113) [:2.3.1-patch-01]
at org.apache.cxf.transport.servlet.ServletDestination.invoke(ServletDestination.java:97) [:2.3.1-patch-01]
at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:461) [:2.3.1-patch-01]
at org.jboss.wsf.stack.cxf.ServletControllerExt.invoke(ServletControllerExt.java:172) [:3.4.1.GA]
at org.jboss.wsf.stack.cxf.RequestHandlerImpl.handleHttpRequest(RequestHandlerImpl.java:57) [:3.4.1.GA]
at org.jboss.wsf.stack.cxf.transport.ServletHelper.callRequestHandler(ServletHelper.java:156) [:3.4.1.GA]
at org.jboss.wsf.stack.cxf.CXFNonSpringServletExt.invoke(CXFNonSpringServletExt.java:90) [:3.4.1.GA]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:179) [:2.3.1-patch-01]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:103) [:2.3.1-patch-01]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) [:1.0.0.Final]
at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:159) [:2.3.1-patch-01]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.1.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final]
at org.jboss.resteasy.plugins.server.servlet.FilterDispatcher.doFilter(FilterDispatcher.java:63) [:6.1.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274) [:6.1.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.1.0.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.1.0.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [:6.1.0.Final]
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.1.0.Final]
at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final]
at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final]
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.1.0.Final]
at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.1.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:159) [:6.1.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.1.0.Final]
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.1.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.1.0.Final]
at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.1.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.1.0.Final]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.1.0.Final]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.1.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.1.0.Final]
at java.lang.Thread.run(Thread.java:619) [:1.6.0_18]
所以最后我的问题是：有没有人有过 CXF Continuation 和 WS 的经验，可以给我一个提示，这个尝试有什么问题？
我真的不明白为什么在PhaseInterceptorChain.doIntercept中重新抛出异常。
亲切的问候， avithan