Hi.
The component rendering guide suggests ordering and short-circuiting
should prevent components and mixins using the same render phase from
crossing swords, so to speak.
Basically I've got a case where this doesn't seem to work out:
AbstractField has a @Mixin DiscardBody.
@Mixin DiscardBody returns false for beforeRenderBody().
(Note that @Mixin DiscardBody has a @MixinAfter.)
My component derives from AbstractField.
My component returns true for beforeRenderBody().
According to the docs I expect my component to short-circuit the
phase and prevent DiscardBody's beforeRenderBody() from being invoked,
but instead an exception is thrown. (Full stack trace appended below.)
My expectation seems reasonable, especially considering the comment
before the exception raising code, but which is correct? ;-)
// Given that this method is *only* invoked from code
// that is generated at runtime and proven to be correct,
// this should never, ever happen. But what the hell,
// let's check anyway.
Cheers,
Nick.
java.lang.IllegalStateException
Can not store result from invoking method org.apache.tapestry.corelib.
mixins.DiscardBody.beforeRenderBody() (at DiscardBody.java:31), because
an event result value has already been obtained from some other event
handler method.
Stack trace
*
org.apache.tapestry.internal.services.EventImpl.storeResult(EventImpl.java:58)
*
org.apache.tapestry.corelib.mixins.DiscardBody.beforeRenderBody(DiscardBody.java)
*
org.apache.tapestry.internal.structure.ComponentPageElementImpl$8$1.run(ComponentPageElementImpl.java:283)
*
org.apache.tapestry.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:931)
*
org.apache.tapestry.internal.structure.ComponentPageElementImpl.access$100(ComponentPageElementImpl.java:69)
*
org.apache.tapestry.internal.structure.ComponentPageElementImpl$8.render(ComponentPageElementImpl.java:287)
*
org.apache.tapestry.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:57)
*
org.apache.tapestry.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:40)
*
org.apache.tapestry.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:71)
*
org.apache.tapestry.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:81)
*
org.apache.tapestry.internal.services.PageRenderDispatcher.dispatch(PageRenderDispatcher.java:72)
*
org.apache.tapestry.services.TapestryModule$12.service(TapestryModule.java:1066)
*
jp.co.key_planning.kzoku.tapestry.services.AppModule$4.service(AppModule.java:211)
*
jp.co.key_planning.kzoku.tapestry.services.AppModule$6.service(AppModule.java:274)
*
org.apache.tapestry.internal.services.LocalizationFilter.service(LocalizationFilter.java:43)
*
org.apache.tapestry.services.TapestryModule$2.service(TapestryModule.java:657)
*
org.apache.tapestry.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:63)
*
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:97)
*
org.apache.tapestry.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:88)
*
org.apache.tapestry.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:77)
*
org.apache.tapestry.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:110)
*
org.apache.tapestry.services.TapestryModule$11.service(TapestryModule.java:1044)
* org.apache.tapestry.TapestryFilter.doFilter(TapestryFilter.java:135)
*
org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
*
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:471)
*
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
* org.mortbay.http.HttpContext.handle(HttpContext.java:1530)
*
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633)
* org.mortbay.http.HttpContext.handle(HttpContext.java:1482)
* org.mortbay.http.HttpServer.service(HttpServer.java:909)
* org.mortbay.http.HttpConnection.service(HttpConnection.java:820)
* org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:986)
* org.mortbay.http.HttpConnection.handle(HttpConnection.java:837)
*
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:245)
* org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
* org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
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