real-timeeventchannelconfiguration

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1、Real-TimeEventChannelConfigurationConfiguringtheEventChannelatCompilationTimeTAO'sReal-TimeEventChannelcanbeconfiguredatcompilationtimetouseadifferentpayloadthanitsdefault.Todosothereareseveraloptions:·Toeliminatethe CORBA::Any fieldintheeventpayloadyoushoulddefinethe TAO_LACKS_EVENT_CHANNEL_ANY

2、 macrowheninvokingtheIDLcompiler.Youcandoasfollows:·$cd$TAO_ROOT/orbsvcs/orbsvcs·$makeTAO_IDLFLAGS=-DTAO_LACKS_EVENT_CHANNEL_ANY·Similarlyyoucaneliminatetheoctetsequencefieldintheeventpayloadusing:·$cd$TAO_ROOT/orbsvcs/orbsvcs·$makeTAO_IDLFLAGS=-DTAO_LACKS_EVENT_CHANNEL_OCTET_SEQUENCE·Finallyyou

3、canprovideyourowneventpayload,todothisyoushouldReplacethecontentsofthe RtecDefaultEventData.idl anddefinesomeIDLstructurenamed RtecEventData.Forexample,youcoulddefineyouowneventtypeasfollows:·//ReplaceRtecDefaultEventData.idlwiththis:··structRtecEventData·{·sequencemy_event_payload;·};Run-

4、timeConfigurationThenewimplementationofthereal-timeeventchannelusesafactorytobuildalltheobjectsandstrategiesitrequires.ThefactorycanbedynamicallyloadedusingACEServiceConfigurator,thisisextremelyconvenientbecausethefactorycanalsoparseoptionsintheServiceConfiguratorscriptfile.Therearecurrentlyseve

5、ralimplementationsofthefactory.·The default factorysupportsalloftheoptionsbelowandmostofthepotentialvalues,exceptasspecificallyindicated.·The sched factorydefinesnewoptionvaluesasindicatedbelowthatallowtheRTEStointegratewiththeReal-TimeSchedulingService.Useofthesched factoryrequiresthatyoulinkin

6、theTAO_RTSchedEventlibrary.·The tpc (threadperconsumer)factorydefinesnewoptionsvaluesasindicatedbelow.ThisstrategyissimilartotheMTdispatchingstrategyinthatitseparatesthethreadthatreceivesthepush()fromasupplierfromthethreadthatdoestheeventualpush()totheconsumer(s),butitdiffersfromMTinthatMThasapo

7、olofthreadspullingfromasinglequeueandultimatelypotentiallyservicingeveryconsumer,whereasTPChasaqueuefor eachconsumerand,thus,asinglethreaddedicatedtopushingtothatconsumer.Thisinsuresthatabadly-behavedconsumer CANNOT haveanad